north anna, unit 1, asme section xi inservice inspection ... · n1-13-prt-004 unit 1 third interval...

10 CFR 50.55a

VIRGINIA ELECTRIC AND POWER COMPANY

RICHMOND, VIRGINIA 23261

February 1, 2010

United States Nuclear Regulatory CommissionAttention: Document Control DeskWashington, D.C. 20555

Serial No.NLOS/ETSDocket No.License No.

10-013RO50-338NPF-4

VIRGINIA ELECTRIC AND POWER COMPANY (DOMINION)NORTH ANNA POWER STATION UNIT 1ASME SECTION XIINSERVICE INSPECTION PROGRAMRELIEF REQUEST N1-13-PRT-004 - LIMITED COVERAGE EXAMINATIONSPERFORMED IN THE THIRD TEN YEAR INSPECTION INTERVAL

Dominion performed inservice inspection (lSI) examinations at North Anna PowerStation Unit 1 during the third ten-year lSI interval to the requirements of the 1989Edition of ASME Section XI. Certain examination coverage were limited, i.e., less than90% weld coverage achieved, due to physical interferences that prohibited attaining fullweld coverage.

Pursuant to 10 CFR 50.55a(g)(5)(iii), relief is requested from certain requirements of theASME Section XI Code associated with examinations where only limited weld coveragewas obtained. Relief Request N1-13-PRT-004 is included in the attachment to thisletter, and provides the basis for this request. The Facility Safety Review Committeehas reviewed and approved the relief request.

If you have any questions or require additional information regarding the attached reliefrequest, please contact Mr. Thomas Shaub at (804) 273-2763.

Very truly yours,

Iceident - Nuclear Engineering

Attachment

Commitments made in this letter: None

Serial No. 10-013Docket No. 50-338

Third Interval lSI Limited Examination Relief Request of 2

cc: U.S. Nuclear Regulatory CommissionRegion IISam Nunn Atlanta Federal Center61 Forsyth Street, SWSuite 23T85Atlanta, Georgia 30303

Mr. J. E. Reasor, Jr.Old Dominion Electric CooperativeInnsbrook Corporate Center4201 Dominion Blvd.Suite 300Glen Allen, Virginia 23060

NRC Senior Resident InspectorNorth Anna Power Station

Ms. K. R. CottonNRC Project ManagerU. S. Nuclear Regulatory CommissionOne White Flint NorthMai I Stop 0-8 G9A11555 Rockville PikeRockville, Maryland 20852

Dr. V. SreenivasNRC Project ManagerU. S. Nuclear Regulatory CommissionOne White Flint NorthMail Stop 0-8 G9A11555 Rockville PikeRockville, Maryland 20852

Attachment

RELIEF REQUEST N1-13-PRT-004LIMITED COVERAGE EXAMINATIONS

Virginia Electric and Power Company(Dominion)

North Anna Power Station Unit 1


Serial No.1 0-013Docket No. 50-338

NAPS Unit 1 3'd Interval Limited ExamsPage 1 of 61

N1-13-PRT-004UNIT 1 THIRD INTERVAL LIMITED EXAMS

CONTENTS

1.0 ASME CODE COMPONENT(S) AFFECTED 4

2.0 APPLICABLE CODE EDITION AND ADDENDA .4

3.0 APPLICABLE CODE REQUIREMENT 4

A1 Lower Shell to Bottom Head Spherical Ring Volumetric Examination 74.A1 IMPRACTICALITY OF COMPLIANCE5.A1 BURDEN CAUSED BY COMPLIANCE6.A1 PROPOSED ALTERNATIVE AND BASIS FOR USE

A2 Bottom Head Spherical Ring to Bottom Head Cap 104.A2 IMPRACTICALITY OF COMPLIANCE5.A2 BURDEN CAUSED BY COMPLIANCE6.A2 PROPOSED ALTERNATIVE AND BASIS FOR USE

A3 Meridionals at 192.5° and 72.5° 134.A3 IMPRACTICALITY OF COMPLIANCE5.A3 BURDEN CAUSED BY COMPLIANCE6.A3 PROPOSED ALTERNATIVE AND BASIS FOR USE

A4 Pressurizer Nozzle-To-Vessel Welds 174.A4 IMPRACTICALITY OF COMPLIANCE5.A4 BURDEN CAUSED BY COMPLIANCE6.A4 PROPOSED ALTERNATIVE AND BASIS FOR USE

A5 Pumps -Integrally Welded Attachments 224.A5 IMPRACTICALITY OF COMPLIANCE5.A5 BURDEN CAUSED BY COMPLIANCE6.A5 PROPOSED ALTERNATIVE AND BASIS FOR USE

B1 Nozzles Without Reinforcing Plate in Vessels> Y2 in. NominalThickness, Nozzle-to-Vessel Welds 254.B1 IMPRACTICALITY OF COMPLIANCE5.B1 BURDEN CAUSED BY COMPLIANCE6.B1 PROPOSED ALTERNATIVE AND BASIS FOR USE

B2 Piping - Integrally Welded Attachments 284.B2 IMPRACTICALITY OF COMPLIANCE5.B2 BURDEN CAUSED BY COMPLIANCE6.B2 PROPOSED ALTERNATIVE AND BASIS FOR USE

Serial NO.1 0-013Docket No. 50-338

NAPS Unit 1 3rd Interval Limited ExamsPage 2 of 61

B3 Circumferential Piping Welds ~ 3/8 in. Nominal Wall Thicknessfor Piping> NPS 4 324.B3 IMPRACTICALITY OF COMPLIANCE5.B3 BURDEN CAUSED BY COMPLIANCE6.B3 PROPOSED ALTERNATIVE AND BASIS FOR USE

B4 Circumferential Piping Welds> 1/5 in. Nominal Wall ThicknessFor Piping ~ NPS 2 and :S NPS 4 404.B4 IMPRACTICALITY OF COMPLIANCE5.B4 BURDEN CAUSED BY COMPLIANCE6.B4 PROPOSED ALTERNATIVE AND BASIS FOR USE

R1 Risk-Informed Piping Welds .434.R1 IMPRACTICALITY OF COMPLIANCE5.R1 BURDEN CAUSED BY COMPLIANCE6.R1 PROPOSED ALTERNATIVE AND BASIS FOR USE

7.0 DURATION OF PROPOSED ALTERNATIVE 61

8.0 PRECEDENTS 61

9.0 REFERENCES 61

FIGURES

Figure Al-l, 11715-WMKS-RC-R-1.1/1-RC-R-1/4 8Figure A1-2, 11715-WMKS-RC-R-1.1 /1-RC-R-1 /4 9Figure A2-1, 11715-WMKS-RC-R-1.1/1-RC-R-1/8 11Figure A2-2, 11715-WMKS-RC-R-1.1/1-RC-R-1/8 12Figure A3-1, 11715-WMKS-RC-R-1.1/1-RC-R-1/6,

11715-WMKS-RC-R-1.1/1-RC-R-1/7 14Figure A3-2, 11715-WMKS-RC-R-1.1/1-RC-R-1/6 15Figure A3-3, 11715-WMKS-RC-R-1.1/1-RC-R-1/7 16Figure A4-1, 11715-WMKS-RC-E-2/1-RC-E-2/1 0,

11715-WMKS-RC-E-2/1-RC-E-2/11,11715-WMKS-RC-E-2/1-RC-E-2/12 19

Figure A4-2, 11715-WMKS-RC-E-2/1-RC-E-2/13,11715-WMKS-RC-E-2/1-RC-E-2/14 20

Figure A5-1, 11715-WMKS-01 03Y/6-SI-133/18H 23Figure 81-1, 11715-WMKS-SI-TK-2/1-SI-TK-2/3,

11715-WMKS-SI-TK-2/1-SI-TK-2/4 26Figure 82-1, 11715-WMKS-01 03AF/6-SI-19/26H,

11715-WMKS-01 07C/8-QS-4/34H 29Figure 83-1, 11715-WMKS-0104A/10-SI-141/4 34Figure 83-2, 11715-WMKS-01 04A/10-SI-141/5 35Figure 83-3, 11715-WMKS-0111 AB/6-CH-19/SW-20W 36Figure 83-4, 11715-WMKS-0111AB/6-CH-19/1 37Figure 83-5, 11715-WMKS-0111XKl6-SI-169/SW-39 38Figure 83-6, 11715-WMKS-0113A/14-RH-2/11 39Figure 84-1, 11715-WMKS-0111 XA/3-CH-11/SW-1W 41Figure 84-2, 11715-WMKS-0111 XKl3-SI-23/SW-65 42



Figure R1-1, 11715-WMKS-0103AD/6-RC-21/18 47Figure R1-2, 11715-WMKS-0103W/6-RC-20/41 .48Figure R1-3, 11715-WMKS-01 03W/6-RC-20/42 49Figure R1-4, 11715-WMKS-0109D/14-RC-10/SW-51 50Figure R1-5, 11715-WMKS-0109E-1/271/2-RC-3/10 51Figure R1-6, 11715-WMKS-01 09E-2/27 1/2-RC-3/SW-41 52Figure R1-7, 11715-WMKS-0109F-1/271/2-RC-6/38 53Figure R1-8, 11715-WMKS-0109G-1/271/2-RC-9/34 54Figure R1-9, 11715-WMKS-01 09G-2/27 1/2-RC-9/SW-43 55Figure R1-10, 11715-WMKS-0111 BB/3-CH-1/19 56Figure R1-11, 11715-WMKS-RC-E-1B.2/29-RC-4/N-SE29 IN.,

11715-WMKS-RC-E-1 B.2/31-RC-5/N-SE31 IN 57Figure R1-12, 11715-WMKS-0103K16-SI-131/21 59Figure R1-13, 11715-WMKS-RC-E-1C.2/31-RC-8/N-SE31 IN 60

TABLES

Table 1, Repetitive/Duplicative Reliefs Requested in Accordancewith 10 CFR 50.55a(g)(5)(iii), Inservice Inspection Impracticality 5

Table A4-1, 11715-WMKS-RC-E-2/1-RC-E-2/1 0,11715-WMKS-RC-E-2/1-RC-E-2/11,11715-WMKS-RC-E-2/1-RC-E-2/12 19

Table A4-2, 11715-WMKS-RC-E-2/1-RC-E-2/13 20Table A4-3, 11715-WMKS-RC-E-2/1-RC-E-2/14 21Table A5-1, 11715-WMKS-01 03Y/6-SI-133/18H 24Table 81-1, 11715-WMKS-SI-TK-2/1-SI-TK-2/3,

11715-WMKS-SI-TK-2/1-SI-TK-2/4 27Table 82-1, 11715-WMKS-01 03AF/6-SI-19/26H 30Table 82-2, 11715-WMKS-01 07C/8-QS-4/34H 31Table 83-1, 11715-WMKS-0104A/10-SI-141/4 34Table 83-2, 11715-WMKS-0104A/10-SI-141/5 35Table 83-3, 11715-WMKS-0111AB/6-CH-19/SW-20W 36Table 83-4, 11715-WMKS-0111 AB/6-CH-19/1 37Table 83-5, 11715-WMKS-0111XKl6-SI-169/SW-39 38Table 83-6, 11715-WMKS-0113A/14-RH-2/11 39Table 84-1, 11715-WMKS-0111 XA/3-CH-11/SW-1W 41Table 84-2, 11715-WMKS-0111 XKl3-SI-23/SW-65 42Table R1-1, 11715-WMKS-01 03AD/6-RC-21/18 47Table R1-2, 11715-WMKS-0103W/6-RC-20/41 48Table R1-3, 11715-WMKS-01 03W/6-RC-20/42 49Table R1-4, 11715-WMKS-0109D/14-RC-10/SW-51 50Table R1-5, 11715-WMKS-0109E-1/27 1/2-RC-3/1 0 51Table R1-6, 11715-WMKS-01 09E-2/27 1/2-RC-3/SW-41 52Table R1-7, 11715-WMKS-01 09F-1/27 1/2-RC-6/38 53Table R1-8, 11715-WMKS-01 09G-1/27 1/2-RC-9/34 54Table R1-9, 11715-WMKS-0109G-2/27 1/2-RC-9/SW-43 55Table R1-10, 11715-WMKS-0111 BB/3-CH-1/19 56Table R1-11, 11715-WMKS-RC-E-1 B.2/29-RC-4/N-SE29 IN 57Table R1-12, 11715-WMKS-RC-E-1 B.2/31-RC-4/N-SE31 IN 58Table R1-13, 11715-WMKS-0103K16-SI-131/21 59Table R1-14, 11715-WMKS-RC-E-1 C.2/31-RC-8/N-SE31 IN 60



N1-13-PRT-004UNIT 1 THIRD INTERVAL LIMITED EXAMS

Relief Request in Accordance with 10 CFR 50.55a(g)(5)(iii)-- Inservice Inspection Impracticality--

1.0 ASME CODE COMPONENT'S) AFFECTED

Refer to Table 1, Columns 1 and 2.

2.0 APPLICABLE CODE EDITION AND ADDENDA

North Anna Power Station Unit 1 (NAPS 1) applicable Code for the third 1O-year inserviceinspection (lSI) interval and the lSI program is in accordance with the 1989 Edition of Section XIwith No Addenda (Reference 1). NAPS 1 third interval end date was April 30, 2009.

3.0 APPLICABLE CODE REQUIREMENT

Refer to Table 1, Column 3.

Components identified in this request require examination of essentially 100 percent of the weldlength. "Essentially 100 percent" as clarified by ASME Code Case N-460, Alternative ExaminationCoverage for Class 1 and Class 2 Welds, is greater than 90 percent coverage of the examinationvolume, or surface area, as applicable.

REQUEST 1. ASMECODE 2. COMPONENT 10NO. 3. APPLICABLE 4. 5. BURDEN 6. PROPOSED 7. DURATIONNUMBER COMPONENT CODE IMPRACTICALITY CAUSED BY ALTERNATIVE OF PROPOSED

REQUIREMENT OF COMPLIANCE COMPLIANCE AND BASIS ALTERNATIVE

A1 LowerShell to Bottom Exam Categorj' B-A, See Paragraph4 A1 See Paragraph 5 A1 See Paragraph 6/11 See Paragraph 7HeadSphericalRing Item No B1 11

11715-VVlvlKS-RC-R-1 1J1-RC-H-1i4 76% Length andVolume Coveraqs

A2 Bottom Head Spherical Exam Category B-A, See Paragraph4 A2 See Paragraph 5 ,N See Paragraph6N See Paragraph 7Ring to Bottom HeadCap Item No B121

11715-WMKS-RC-R-1 1i1-RC-R-1 f8 75% Length andVolume Coverage

A3 h~endiollal at 192S and E~.aiYI Categor\' B-,A See Para;jr3ph 4 /,·3 SeA P~!-3flf2rh J ,[:,,3 Sf'J? Pala~;H"a~'h F: Al SP,p Prlfrl_~!r::lrh ?Meridionalat 72 5' Item f'Jo B1 22

1171b-II\IMKS-RC-R-1 1i1-RC-R-1r6 61~io Volume Coveraqs

11715-'tlMKS-RC-R-1 1i1-RC-R-1i7 67% Volume Coverage

A4 PressunzerNozzle-To- Exam Category B-D See Paragraph4 A.4 See Paragraph 5 1>.4 See Paragraph €A.4 :See Paragraph 7Vessel V'Velds Item No 83110

11715-WMKS-RC-E-2i1-RC-E-2i10 78 36% VolumeCovsraoe

11715,wMKS-RC-E-2il-RC-E-2il1 73,36%VolumeCovsraqe

11715-VVMKS-RC-E-2!1-RC-E-2J12 78 36% VolumeCovsrace

11715-WMKS-RC-E-2J1-RC-E-2i13 512% VolumeCoveracs

1171b-VVMKS-RC-E-21i1-RC-E-2i14 75% VolumeCove-moe

A5 Pumps Integrally Exam Category B-K See Paragraph4 AS See Paragraph 5 AS See Paragraph € AS See Paragraph 7Welded Attachments Item No 81020

11715-WMKS-0103Yi6-SI-133J18H 87% Surface Coveraos

81 NozzlesVVithout Exam Categor; CoB See Paragraph 4 B1 See Paragraph 5 B1 See Paragraph 6 B1 See Paragraph 7Reinforcing Plate in Item 1,10 C2 21

Vessels> 112 In HominatThickness - Nozzle-to-

Shell \'Velds11715-WMKS-SI-TK-2i1-SI-TK-2--3 36~'o Volume Coveraae11715-INMKS-SI-TK-2/1-SI-TK-2'4 36% Volume Coveraos

82 Piping - Integrally Welded Exam Category C-C See Paragraph4 82 See Paragraph 5 B2 See Paragraph 6 82 :See Paragraph 7Attachments Item No C320

1171:5-'NI'JlKS-01 03AF/6-SI-1 gi26H 85 43% SurfaceCoveraqe

11715-WMKS-0107Ci8-0S-4134H 84 85% Surface('(,I"'~r~n,

z»"UenC:::J;::;:

REQUEST 1. ASME CODE 2. COMPONENT 10 NO. 3. APPLICABLE 4. 5. BURDEN 6. PROPOSED 7. DURATIONNUMBER COMPONENT CODE IMPRACTICALITY CAUSED BY AL TERNATlVE OF PROPOSED

REQUIREMENT OF COMPLIANCE COMPLIANCE AND BASIS ALTERNATlVE

B3 Circumferential Piping Exam Calegory C-F-1 See Paragraph4 B3 See Paragraph 5 B3 See Paragraph 6.B3 See Paragraph 7VVelds 2 3/8 in Hominal Item [·Jo C511

Wall Thickness for Piplllg'» NPS 4

11715-WMKS-010411.-1/10-SI-141/4 50% Volume Coveraqe11715-W['J1I(S-0104A-1110-SI-141i~ 50% Volume Coveraqe

117150VVMKS-0111AB/6-CH·19/SW-20IN 50% Volume Coveraoe11715·'NMKS-0111AB/6-CH·19'" 50% Volume Coveraqe

11715-\.VMKS-0111XKi6-SI-169/S\N-39 65 42% VolumeCoverage

11715-WMKS-011JA-li14-RH-2/11 50% Volume Coveraue

B4 Crrcumfarsntral Plplllg Exam Catsqorv C-F-1 See Paragraph4 B4 See F'aragraph 5 B4( See Paragraph 6 Boll See Paragraph 7

'Nelds ' 115 111 Homina: Item r-Io CS 21I\/\'all Thickness 101 Piping

, , , !I iz r'lPS 2 and' I·IPS 4

I I11715-VVMKS-0111XAi3~CH·11/SW-1W 50% volume Coverace11715-\NMKS-0111XKi3-SI-23/SVV-65 841% Volume

Coveraqe

R1 Piping Welds Exam Calegory R-II. See Paragraph4 R1 See Paragraph 5 R1 See Paragraph GR1 See Paragraph?ltern No R1 11

11715-Wf.,,1KS·0103ADi6-RC-21/18 83.3% VolumeCovsraoe

11715-WMKS·0103W/6-RC-20i41 50% Volume Coverage11715-WMKS-0103VJi6-RC-20/42 83 35% Volume

Coverage

11715-WMKS-0109D!14-RC-10iS\V-51 65% Volume Coverage

11715WMKS·0109E-1i271i2-RC-3i10 39% Volume Coverage

11715-WMKS-0109E-2/271/2-RC·3/SW-41 35% Volume Coverage

11715-WMKS-0109F·1 i271i2-RC-6i38 75% Volume Coverage

11715-WMKS-0109G-1i27 1i2-RC-9i34 8 33% VolumeCoverage

11715-WMKS-0109G-2/27 1i2-RC-9/SW-43 22% Valurns Coverage

11715-'NMKS-0111BBi3-CH-1i 19 50% Volume Coverage

11715-WMKS-RC-E-16 2i29-RC-4/N-SE29 Ir·J 80% Volume Coverage

11715-WMKS-RC-E-162i31-RC-5ir'i-SE31IN 79% Volume Coverage

11715-WMKS-0103K/6-SI-131i21 48% Volume Coverage11715-WMKS-RC-E-1C 2/31-RC-8!lJ-SE31 IN 50% Volume Coverage

'"""Q)C"-(I)....

z»"UenC::J;:::;:



A1. Lower Shell to Bottom Head Spherical Ring Volumetric Examination

4.A1 IMPRACTICALITY OF COMPLIANCE

In accordance with 10CFR50.55a(g)(5)(iii), relief is requested from the "essentially 100percent" volumetric examination coverage requirement for the identified Lower Shell toBottom Head Spherical Ring weld W04. This requirement is considered impractical dueto the configuration of the reactor vessel core support pads.

Ultrasonic examination of weld W04 is limited to 76% coverage due to the core supportpads at four locations along the path of the weld as shown in Figure A1-1 and Figure A12. Examination was performed to the extent possible using qualified equipment, and nofurther coverage is possible with existing technology.

5.A1 BURDEN CAUSED BY COMPLIANCE

Destruction of the component would be necessary to perform 100% of the Code requiredexamination as written in the 1989 ASME Section XI Code Edition and is contrary to theintent of the Code.

6.A1 PROPOSED ALTERNATIVE AND BASIS

It is proposed that the examinations already completed at the reduced coverage becounted as meeting the Code requirements. The limited volumetric examination andvessel internal visual examination should detect any general patterns of degradation thatmay occur in the areas covered, therefore providing reasonable assurance of thecontinued structural integrity of the subject weld.

As part of the examination of the reactor vessel internal surfaces, complete electronicvisual examination (EVT) was performed at each of these weld locations as well. Twoother examinations were performed on Category B-A, Item B1.11 components in thethird lSI inspection interval, welds W02 and W03, obtaining "essentially 100 percent"volumetric examination coverage. Second inservice inspection interval relief wasgranted for approximately 80% coverage for weld W04 granted May 14, 2001.

Serial No, 10-013Docket No, 50-338


Figure A1-111715-WMKS-RC-R-1.1/1-RC-R-1/4

-- ~.~. J 5 NOM

",6B 8M1\-+---1

89,21'~AP!~AN

090

WELD WIDTH • 1.84"

j' 9029'

~lP

'I II 102,10MTP

! 5~'("1; I ! 10242'

T' I. : .. I-"'f----'---CORE \ \, \

",..) ~SUPPORI\ \PAD \

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NAPS Unit 1 3 rd Interval Limited ExamsPage 9 of 61


90'Inu]

78,gr--'--<--' ~n-... -_______..

IATP 7736'

MAP/MAN

(J

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I,

2810J'IATP

270'[90'J

258.97'MTP

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A2. Bottom Head Spherical Ring to Bottom Head Cap


In accordance with 10CFR50.55a(g)(5)(iii), relief is requested from the "essentially 100percent" volumetric examination coverage requirement for the identified Bottom HeadSpherical Ring to Bottom Head Cap weld W08. This requirement is consideredimpractical due to the configuration of the reactor vessel incore instrumentation nozzles.

Ultrasonic examination of weld W08 is limited to 75% coverage due to the incoreinstrumentation nozzles along the path of the weld as shown in Figure A2-1 and FigureA2-2. Examination was performed to the extent possible using qualified equipment, andno further coverage is possible with existing technology.





As part of the examination of the reactor vessel internal surfaces, complete electronicvisual examination (EVT) was performed at this weld location as well. Second inserviceinspection interval limitation relief was granted in request NDE-49 for approximately80.5% coverage.




f- ~ 1 5 7 0 1

o 16 NO"~- -~ CLAD

758 B1Hr-

.,.- () AlPHA ANC'r

_.~~t-'--1 180 A! PHA ANG r

TOTAL THETA SCAN AREA or WELD waB"""'"IS LIMITED our TO

, \N5TIWMENTATlQN NOZZLES J~ THQu 50 \I .__ ~_~'

016 NOM.Y CLAD

sY

n

130 15~

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1 HU51'~TPi~TN

/\

\/-1,5C

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Serial No, 10-013Docket No, 50-338



0'[0']

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[180']



A3. Meridionals at 192.5° and 72.5°


In accordance with 1OCFR50.55a(g)(5)(iii), relief is requested from the "essentially 100percent" volumetric examination coverage requirement for the identified Reactor VesselMeridional Welds at 192.5° and 72.5°, welds W06 and W07. This requirement isconsidered impractical due to the configuration of the reactor vessel incoreinstrumentation nozzles and core lug obstructions.

Ultrasonic examination of weld W06 is limited to 61% coverage and weld W07 is limitedto 67% coverage due to the incore instrumentation nozzles and core lug obstructions asshown in Figure A3-1, Figure A3-2, and Figure A3-3. Examination was performed to theextent possible using qualified equipment, and no further coverage is possible withexisting technology.





As part of the examination of the reactor vessel internal surfaces, complete electronicvisual examination (EVT) was performed at each of these weld locations as well. Oneother examination was performed on a Category B-A, Item B1.22 component in the thirdlSI inspection interval, weld W05, obtaining "essentially 100 percent" volumetricexamination coverage.



Figure A3-111715-WMKS-RC-R-1.1/1-RC-R-1/611715-WMKS-RC-R-1.1/1-RC-R-1/7

l~I (BMT)

TOTAL SCAN AREA OF WELDS WOG &: W07IS LIMITED DUE TO INSTRUMENTATION

NOZZLE AND CORE LUG oeSTRUCTIONS

120.79"

\

.>

CORE LUG .L:» O' ALPHA ANGLE

WELD W04__t_~~1r-_36:=~~=--.~-=-~=--::--:::·\=r '0" ALPHA mCl'

III


NAPS Unit 1 3rd Interval Limited ExamsPage150f61


WQ6192.5'

[167.5']I,

\ I48·

\42• • /

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WELD W06




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WELD W07



A4. Pressurizer Nozzle-To-Vessel Welds


In accordance with 10CFR50.55a(g)(5)(iii), relief is requested from the "essentially 100percent" volumetric examination coverage requirement for the identified PressurizerNozzle-To-Vessel Welds. This requirement is considered impractical due to thepressurizer to nozzle weld configuration.

Ultrasonic examination of the following pressurizer nozzle-to-vessel welds are limited incoverage due to the pressurizer to nozzle weld configuration as shown in the attachedfigures. Examination was performed to the extent possible using qualified equipment,and no further coverage is possible with existing technology.

MarklWeld # Line # Scan Coverage % FigurelTable

10 1-RC-E-2 78.36% Fig. A4-1/Tab. A4-1

11 1-RC-E-2 78.36% Fig. A4-1/ Tab. A4-1

12 1-RC-E-2 78.36% Fig. A4-1/ Tab. A4-1

13 1-RC-E-2 51.2% Fig. A4-2/ Tab. A4-2

14 1-RC-E-2 75% Fig. A4-2/ Tab. A4-3

Welds 10, 11, and 12, the safety nozzles, are limited to 78.36% due to nozzle geometryand because the cladding prevents extended V-path. Refer to Figure A4-1 and TableA4-1 for coverage details of the limitations experienced. Second interval relief for welds10, 11, and 12 exam limitations was granted in Relief Request NOE-20 at 72% coverage.

Weld 13, the relief nozzle, is limited to a single-sided exam due to nozzle configuration.In the parallel direction, the percent of weld metal examined was 50.8%. In theperpendicular direction from the head side, the percent of weld metal examined was89.5% with a 45 degree search unit head and 93.3% with a 60 degree search unit head.In the perpendicular direction from the nozzle side, the percent of weld metal examinedwas 9.2% with a 45 degree search unit and 5.4% with a 60 degree search unit. Theparallel base metal examination obtained 43% coverage. The perpendicular base metalexamination obtained 67% coverage with a 45 degree search unit and 77.3% coveragewith a 60 degree search unit. The total coverage for weld 13 is limited to 51.2% asshown in Figure A4-2 and Table A4-2. Second interval relief was granted in NOE-38 at88.4% coverage.

Weld 14, the spray nozzle, is limited to 75% due to the weld location in relation to thenozzle. Second interval relief for weld 14 exam limitations was granted in Relief RequestNOE-19 at 75% coverage.

All six of the welds in Category 8-0, Item No. 83.110, have limited examinationcoverage. Weld 9 is included in relief request NOE-6 with alternative examinationrequirements (VT-2 each refueling).

Serial NO.10-013Docket No. 50-338





It is proposed that the examinations already completed at the reduced coverage becounted as meeting the Code requirements. Alternative components could not besubstituted for examination due to the mandatory selection requirements of the Code.The limited volumetric examination should detect any general patterns of degradationthat may occur in the areas covered, therefore providing reasonable assurance of thecontinued structural integrity of the subject weld.


NAPS Unit 1 3rd Interval Limited ExamsPage 190f61

Figure A4-111715-WMKS-RC-E-2/1-RC-E-211011715-WMKS-RC-E-2/1-RC-E-2/1111715-WMKS-RC-E-2/1-RC-E-2112

W I U, I I, ? Ii 1'1

~.

I

/

~ '.. ::" ~:. ,~;, '-;. :..~' :, -,- .' i!("liE (\1)

Table A4-111715-WMKS-RC-E-2/1-RC-E-211011715-WMKS-RC-E-2/1-RC-E-211111715-WMKS-RC-E-2/1-RC-E-2112

Beam Angle ScanExam Area Scan %

(degrees) Direction0 v.re!d and Base Meta! 0 86.7

45&60 Base Meta! 2 92.4

45 &60 Base Meta! 5 58.3

45 &60 Base Metal 7&8 86.7

45 \Aleld 2 96.3

45 Weld 5 40

45 W'eld 7&8 100

60 VJeld 2 96.5

60 'Weld 5 26.7

60 Weld 7&8 100

Total

Percent 78.36%

Coverage

UT Scan Direction Definitions

2 - Axial scan, 180 degrees from isometric flow direction (weld count).5 - Axial scan, the same direction as the isometric flow (weld count).7 - Circumferential scan, clockwise rotation when viewing in the direction of isometric flow.S - Circumferential scan, counterclockwise rotation when viewing in the direction of isometric flow.



Nozzle

-- -- -- =::::;::::::::-

Figure A4-211715-WMKS-RC-E-2/1-RC-E-211311715-WMKS-RC-E-2/1-RC-E-2114

/IIII1

Pipe

Table A4-211715-WMKS-RC-E-2/1-RC-E-2113


(degrees) Direction0 Base Metal 43

45 &60 Base Meta! Parallel 43

45&60 Base Metal Perpendicular 77.3

0 Weld 50.8

45 VJeld C\N 50.8

45 'Weld CCW 50.8

60 ...~.leld DN 50.8

60 Weld CCW 50.8

45 Weld Head Side 89.5

45 Weld Nozzle Side 9.2

60 Weld Head Side 93.3

60 Weld Nozzle Side 5.4

I

Total

Percent 51.20%

Coverage



Table A4-311715-WMKS-RC-E-2/1-RC-E-2114

BeamScan

Angle Exam Area Scan 0/0Direction(degrees)

0 Weld and Base Metal 0 58.95

45 & 60 Base Metal 2&5 97.64

45 & 60 Base Metal 7&8 65.62

45 Weld 2 98.59

45 Weld 5 40.34

45 Weld 7&8 100

60 Weld 2 98.62

60 Weld 5 16.38

60 Weld 7&8 100

TotalPercent 75.13%

Coverage


2- Axial scan, 180 degrees from isometric flow direction (weld count).5 - Axial scan, the same direction as the isometric flow (weld count).7 - Circumferential scan, clockwise rotation when viewing in the direction of isometric flow.S - Circumferential scan, counterclockwise rotation when viewing in the direction of isometric flow.



AS. Pumps -Integrally Welded Attachments

4.AS IMPRACTICALITY OF COMPLIANCE

In accordance with 10CFR50.55a(g)(5)(iii), relief is requested from the "essentially 100percent" surface examination coverage requirement for the identified Integrally WeldedAttachments on pumps. This requirement is considered impractical due to the pipeclamp adjacent to the bottom portion of the attachment.

Surface examination of the integral attachment weld for support RH-1 on 6" Low HeadSafety Injection line to B RCS Cold Leg is limited to 87.27% coverage due toinaccessible areas missed because of an adjacent pipe clamp. All similar lugs have thesame limitations. Examination was performed to the extent possible.

S.AS BURDEN CAUSED BY COMPLIANCE

Disassembly of the component would be necessary to perform 100% of the Coderequired examination as written in the 1989 ASME Section XI Code Edition and iscontrary to the intent of the Code.

6.AS PROPOSED ALTERNATIVE AND BASIS

It is proposed that the examinations already completed at the reduced coverage becounted as meeting the Code requirements. The limited surface examination shoulddetect any general patterns of degradation that may occur in the areas covered,therefore providing reasonable assurance of the continued structural integrity of thesubject weld.

Eleven components were examined in Category B-K, Item No. B3.110, withoutlimitations, among a total of 114 welds in the category. One of these non-limitedexaminations was on 11715-WMKS-01 03Y/6-SI-133/19H, which was on the same pipingsegment. There were no unacceptable indications for any Category B-K components.



Figure A5-111715-WMKS-0103Y/6-SI-133/18H

(Top View)

J K

Area Not Accessible /Due to PIpe Clamp



Table A5-111715-WMKS-0103V/6-SI-133/18H

Total3.200 1.700 5.4400

A B

1.000 1.700 1.7000

C D

1.700 3200 5.4400

E F

.50 1.000 0.5000

G.50 2.000 1.0000

H

50 2.000 1.0000

I

.50 2.200 1.1000Surface Area Missed

J Due to Pipe Clamp.50 2.200 1.1000

K

Surface Area Required 172800 Total ASME CodArea Missed Due to Pipe Clamp 2.2000 Coverage Achiev

Surface Area Examined 15.0800 87.27 0



B1. Nozzles Without Reinforcing Plate in Vessels> Y2 in. Nominal Thickness, Nozzle-to-VesselWelds

4.B1 IMPRACTICALITY OF COMPLIANCE

In accordance with 10CFR50.55a(g)(5)(iii), relief is requested from the "essentially 100percent" volumetric examination coverage requirement for the identified Nozzle-to-Vesselwelds. This requirement is considered impractical due to single-sided access.

Ultrasonic examination of the identified nozzle-to-vessel welds on the boron injectiontank is limited to 36% volume coverage because of single-sided access due to nozzle toshell weld configuration. Examiners were unable to obtain any coverage with the 0degree scans. Refer to Figure B1-1 and Table B1-1 for coverage details for welds 3 and4. Examination was performed to the extent possible.

5.B1 BURDEN CAUSED BY COMPLIANCE


6.B1 PROPOSED ALTERNATIVE AND BASIS

It is proposed that the examinations already completed at the reduced coverage becounted as meeting the Code requirements. The limited volumetric examination shoulddetect any general patterns of degradation that may occur in the areas covered,therefore providing reasonable assurance of the continued structural integrity of thesubject weld.

Two other components were examined in Category C-B, Item No. C2.21, in the third lSIinspection interval, obtaining "essentially 100 percent" volumetric examination coverage.Second interval relief was granted in relief request NDE-48 with 39% coverage for weld 3and 31% coverage for weld 4.



Figure 81-111715-WMKS-SI-TK-2/1-SI-TK-2/311715-WMKS-SI-TK-2/1-SI-TK-2/4

.....Q)o:::l

"tJ(f)C

~I-oo'0

-..JU

.....Q)o:::l

"tJ(J)c;(1j......f-.

Nozzle3 - Downstream4 - Upstream

Head3 - Upstream4 - Downstream

- --_.~------ - - -

---_.----.----Exam Volume Dimensions = H - 0.7" L - 33" W - 1.4"

/

/

/

---0.125"-~--Nom. Clad



Table 81-111715-WMKS-SI-TK-2/1-SI-TK-2/311715-WMKS-SI-TK-2/1-SI-TK-2/4

AngleScan Scan

Beam

(degrees)Exam Area Direction Direction Scan %

Mark #3 Mark #40 Weld and Base Meta! 0

45 & 60 Base Meta! Downstream Upstream 95.5

45 & 60 Base Meta! Upstream Downstream 100

45 \IVe!d Downstream Upstream 0

45 \JVe!d Upstream Downstream 100

60 Weld Downstream Upstream 0

60 \JVe!d Upstream Downstream 100

45 & 60 Base Meta! (US) CVV &CCVV (US) CW & CeV,! 0

45 & 60 Base r\''1eta~ (DS) ew &CeVlli (DS) (IN· & ecw 0

45 \f,ie!d ew & CCW ew & C(lN 0

60 \fie!d ev./ & eew evv &CCVV 0

ITotal Percent

36.00%Coverage



B2. Piping - Integrally Welded Attachments


In accordance with 10CFR50.55a(g)(5)(iii), relief is requested from the "essentially 100percent" surface examination coverage requirement for the identified weldedattachments. This requirement is considered impractical due to the pipe clamp adjacentto the bottom portion of the attachment.

Surface examination of the integral attachment weld on the 6" Low Head Safety Injectionline to B RCS Hot leg inside Containment is limited to 85.43% coverage due toinaccessible areas missed because of an adjacent pipe clamp. Surface examination ofthe integral attachment· weld for Support R-72 on the 8" discharge piping from B QuenchSpray Pump (1-QS-P-1 B) is limited to 84.85% coverage due to inaccessible areasmissed because of an adjacent pipe clamp. All similar lugs have the same limitations.Examination was performed to the extent possible.


Disassembly of the component would be necessary to perform 100% of the Coderequired examination as written in the 1989 ASME Section XI Code Edition and iscontrary to the intent of the Code.


It is proposed that the examinations already completed at the reduced coverage becounted as meeting the Code requirements. The limited surface examination shoulddetect any general patterns of degradation that may occur in the areas covered,therefore providing reasonable assurance of the continued structural integrity of thesubject weld.

A total of eighteen examinations were completed among 171 active components inCategory C-C, Item No. C3.20, during the third lSI inspection interval with nounacceptable indications found.



Figure 82-111715-WMKS-0103AF/6-SI-19/26H11715-WMKS-0107C/8-QS-4/34H

(Top View)

B C E II

J K

Me. Not Accessible /Due to Pipe Clamp



Table 82-111715-WMKS-0103AF/6-SI-19/26H

Total2.500 1350 3.3750

3.3750

1.3500

0.7500

0.5000

Surface Area MissedDue to Pipe Clamp

1.5000

0.9250

0.9250

A B

1.000 1350

C D

1.350 2.500

E F

.50 1000

G

.50 • .500

H

.50 3.000

1.500

.50 1.850

J.50 1.850

K

Surface Area Required

Area Missed Due to Pipe Clamp

12.70001.8500

Total ASME CodeCoverage Achieved

Surface Area Examined 10.8500 85.43%



Table 82-211715-WMKS-0107C/8-QS-4/34H

Total2.500 0750 1.8150

A 81000 0750 0.7500

C 0

0.750 2.500 1.8150

E F.50 1.000 0.5000

G.50 2.000 1.0000

H.50 2000 1.0000

I

.50 1.250 0.6250

J

..50 1.250 0.6250

KSurface Area MissedDue to Pipe Clamp

Surface Area RequiredArea Missed Due to Pipe Clamp

Surface Area Examined

8.25001.2500

7.0000

Total ASME CodeCoverage Achieved

84.85%



B3. Circumferential Piping Welds ~ 3/8 in. Nominal Wall Thicknessfor Piping> NPS 4


In accordance with 10CFR50.55a(g)(5)(iii), relief is requested from the "essentially 100percent" volumetric examination coverage requirement for the identified piping welds.This requirement is considered impractical primarily due to single-sided access for thesecomponents.

Ultrasonic examination of the identified piping welds are limited as identified in thefollowing table primarily due to single-sided access. Examination was performed to theextent possible.

MarkiWeld # Line # Scan Coverage % FigurelTable

4 10-81-141 50% Fig. B3-1/Tab. B3-1

5 10-81-141 50% Fig. B3-2/Tab. B3-2

8W-20W 6-CH-19 50% Fig. B3-3/Tab. B3-3

1 6-CH-19 50% Fig. B3-4/Tab. B3-4

8W-39 6"-81-169 65.42% Fig. B3-5/Tab. B3-5

11 14-RH-2 50% Fig. B3-6/Tab. B3-6

Refer to the figures and tables identified for each weld for details of the limitation and thecoverage obtained.


The purpose of nondestructive examination (NDE) is to perform inspections withoutdestroying the component. Any actions necessary to make these welds accessible forNDE exam would be contrary to the intent of the Code.



Several of these examinations obtained additional Best Effort Coverage as identified inthe figures and tables that follow. Best Effort Coverage refers to the requiredexamination volume past the weld centerline that is examined with an Appendix VIIIdemonstrated procedure for single sided coverage. Best Effort Coverage is clearlyindicated in the attached tables.



A total of 79 examinations were completed among 848 components in Category C-F-1 ,Item No. C5.11 , during the third lSI inspection interval. In addition to the six limitedexams included in this request, one other limited exam was included in the Unit 1,interval 3, request PRT-2 (Mark # 64, Line # 14-RH-3), with 72% coverage. There wereno reportable indications identified.



Figure 83-111715-WMKS-01 04A11 0-SI-141/4

Tee

FLO__W '7-

CL

Weld ThicknessWeld LengthWeld Width

Valve

0.565"34"0.8"

Box Dimensions = H - 0.16" L - 1.4"

Table 83-111715-WMKS-0104A110-SI-141/4

Coverage Summary

Angle ReqUired Scans (each scan has a weighting factor of 100 for complete coverage)

UpSt-Ax UpSt-CW UpSt-CCW OnSt-Ax OnSt-CW OnSt-CCW

60 100% 100% 100%

70 75%

Code Coverage Total 50%

Best Effort Coverage (Max 50%) Total 12.50%

Notes:

1) Code Coverage refers to the maximum percentage of the raqutred examination

volume that .s effectively examined wtth the qualified examination procedure.

2) Best Effort Coverage refers to the required examination volume past the weld

centerline that is examined wtth an Appendix vm demonstrated procedure for

I

single sided coverage.



Figure 83-211715-WMKS-01 04A11 0-SI-141/5

Valve


Box Dimensions = H - 0.12" L - 1.05"

Table 83-211715-WMKS-0104A110-SI-141/5

0.466"34"0.55"

Pipe

Coverage Summary

Angle Required Scans (each scan has a viJeighting factor of 100 for complete coverage)

UpSt-Ax UpSt-CW UpSt-CCW DnSt-Ax DnSt-CW DnSt-CCW

60 100% 100% 100%

70 100%



Notes:

1" Code Coverage refers to the maximum percentage of the required examination.I

volume that is effectively examined with the qualified examination procedure.

2J Best Effort Coverage refers to the required examination volume past the weld

centerline that is examined with an Appendix \1m demonstrated procedure for




Figure B3-311715-WMKS-0111 AB/6-CH-19/SW-20W

FLOW

Box Dimensions =H - 0.09"

Weld LengthWeld Width

L - 0.95"

Pipe

21"0.45"

Table B3-311715-WMKS-0111 AB/6-CH-19/SW-20W

Coverage SummaryAngle Required Scans (each scan hasa weighting factor of 100 for complete coverage)

UpSt-Ax UpSt-CW UpSt-CCW DnSt-Ax o-se-cw DnSt-CCW

70 100% 100% 100%

70 41%



Notes:

1) Code Coverage refers to the maximum percentage of tine required examination



centerline that is examined with an Appendix Viii demonstrated procedure for




Figure B3-411715-WMKS-0111 AB/6-CH-19/1

FLOWWeld Length 20.8""Weld Width 0.9"

Valve

Box Dimensions =H - 0.09" L - 1.4"

Table B3-411715-WMKS-0111 AB/6-CH-19/1

Pipe

Coverage SummaryAngle ReqUired Scans(each scan has a weighting factor of 100 for complete coverage)

UpSt-Ax UpSt-CW UpSt-CCW DnSt-Ax DnSt-CW DnSt-eCW

70 100'% 100% 100%

70 28%



Notes:

1) Code Coverage refers to the maximum percentage of the required examination


2"< Best Effort Coverage refers to the required examination volume past the weldI

centerline that is examined with an Appendix Viii demonstrated procedure for




Figure 83-511715-WMKS-0111 XKl6-SI-169/SW-39

Weld Thickness 0.7""Weld Width 0.85"

FLOW

DIS Elbow Weld

"''i~r> IT~. -...__

~:.,!;L.......,...---r----h~_----4-~

BITNozzle

Exam performed from the Safe End side only due to Nozzle configuration.

Table 83-511715-WMKS-0111 XKl6-SI-169/SW-39

Coverage Summary

Code Required Coverage:

i Circ, Coverage C\V & CCW 47.0%I

50" Axial Coverage 75.0%

45" Axial Coverage 92.7%

Procedural Coverage:

Ore. Coverage C\V & CCVV 47.2%

50" Axial Coverage 73.7~'b

45" Axial Coverage 82.n~ib

Code Coverage Totall 55.42%

Notes:

1'\ Code Coverage refers tothe maximum percentage of the required examinationJ

volume that is effectively examined with the qualifted examination procedure.



Figure 83-611715-WMKS-0113A114-RH-2/11

FLOW

-~~~l-, -----\, ~------,



Pipe

L - 1.6"

0.438"44"1.1"

Table 83-611715-WMKS-0113A114-RH-2/11

Coverage Summary

Angle Required Scans (each scan has a weightmg factor of 100 for complete coverage)


60 100%

45/60 100% 100%

70 19%



Notes:1\ Code Coverage refers to the maximum percentage ofthe required examination)

volume that is effectively' examined vi/ith the qualified examination procedure.

2) Best Effort Coverage refers to the required examination volume past the '.'veld

centerline that is examined with an Appendix Vii! demonstrated procedure for

single sided coverage. .



B4. Circumferential Piping Welds> 1/5 in. Nominal Wall Thicknessfor Piping ~ NPS 2 and :5 NPS 4



Ultrasonic examination of weld SW-1W is limited to 50% volume coverage because ofthe tee to pipe configuration and the as-welded stainless weld. Scanning could only beperformed on the downstream side in the axial and circumferential directions. Anadditional 70 degree scan was used for "Best Effort" technology for single side detectionof far side effects parallel to the weld and not for coverage.

Ultrasonic examination of weld SW-65 is limited to 84.1% volume coverage because ofthe upstream elbow and the drain line on the downstream side. Because of theupstream elbow, there was no axial exam for 3.0" of the 11.0" total weld length. Becauseof the downstream drain line, there was no axial exam for 2.5" of 11.0" total weld length.Examination was performed to the extent possible.

MarklWeld # Line #

8W-1W 3-CH-11

8W-65 3-81-23

Scan Coverage % FigurelTable

50% Fig. B4-1/Tab. B4-1

84.1% Fig. B4-2/Tab. B4-2


The purpose of nondestructive examination (NDE) is to perform inspections withoutdestroying the component. Any actions necessary to make these welds accessible forNDE exam would be contrary to the intent of the Code.



There were thirty two exams performed among 292 active components in Category C-F1, Item No. C5.21, in the third lSI inspection interval, and all but these two obtained"essentially 100 percent" examination coverage.



Figure 84-111715-WMKS-0111 XA/3-CH-11/SW-1 W


0.430"11.0"0.6"

Tee

Total Volume is 0.15" and Total Area Scanned is 0.075"

Table 84-111715-WMKS-0111 XA/3-CH-11/SW-1 W

Coverage Summary

Angle Required Scans (each scan has a weighting factor of 100 for complete coverage)

UpSt-Ax UpSt-CW UpSt-CCW OnSt-Ax OnSt-CW OnSt-CCW

45/60 100% 100% 100%

70


Best Effort Coverage (Max 50%) Total "'Notes:




centerline that is examined with an Appendix vm demonstrated procedure for

single sided coverage. '" No Best Effort Coverage obtained.



Figure 84-211715-WMKS-0111 XKl3-SI-23/SW-65

FI


0.437"11.0"0.65"


Table 84-211715-WMKS-0111 XKl3-SI-23/SW-65

Coverage Summary

Angle Required Scans (eacn scan nasa weighting factor of lOG for complete coverage}


6D 72.8% 10D% 100% 77.3% 77.3% 77.3~;'o

70 17.7%, 14.8%

Code Coverage Total 84.1%

Best Effort Coverage (Max 50%) Total 5.42~!o

Notes:

f' Code Coverage refers to the maximum percentage of the required examinationJ



centerline that is examined with an Appendix VI!! demonstrated procedure for




R1. Risk-Informed Piping Welds

4.R1 IMPRACTICALITY OF COMPLIANCE


These welds are governed by the Risk-Informed Inservice Inspection (RI-ISI) Programthat was approved by the NRC for North Anna Power Station Unit 1 in their letter datedSeptember 18, 2001. The welds are assigned category R-A, Item R1.11, and requireultrasonic examination. Except for weld 19 on line # 3-CH-1 , each of these welds arelocated in the Westinghouse Risk Matrix Region 2 (Perdue Model Sample) which allowsalternative selections if they exist.

MarklWeld # Line # Scan Coverage % FigurefTable

18 6-RC-~~1 83.3% Fig. 84-1/Tab. 84-1

41 6-RC-20 50% Fig. 84-2/Tab. 84-2

42 6-RC-20 83.35% Fig. 84-1/Tab. 84-1

SW-51 14-RC-10 65% Fig. 84-2/Tab. 84-2

10 27 Y2-RC-3 39% Fig. 84-1/Tab. 84-1

SW-41 27 Y2-RC-3 35% Fig. 84-2/Tab. 84-2

38 27 Y2-RC-6 75% Fig. 84-1/Tab. 84-1

34 27 Y2-RC-9 8.33% Fig. 84-2/Tab. 84-2

SW-43 27 Y2-RC-9 22% Fig. 84-1/Tab. 84-1

19 3-CH-1 50% Fig. 84-2/Tab. 84-2

N-SE29 IN. 29-RC-4 80% Fig. 84-1/Tab. 84-1

N-SE31 IN. 31-RC-5 79% Fig. 84-2/Tab. 84-2

21 6-SI-131 48% Fig. 84-1/Tab. 84-1

N-SE31 IN. 31-RC-8 50% Fig. 84-2/Tab. 84-2

Weld 18 downstream side axial scan is obstructed from examination due to the weld-olet configuration. Weld 18 is on risk-informed inservice inspection (RI-ISI) segment RC018 which includes seven welds. Two segment welds were examined, one withcomplete coverage and weld 18 receiving 83.3% coverage, which provides goodrepresentative coverage for the segment.

Weld 41 upstream side examination is limited due to the valve to elbow configuration.Weld 41 is on RI-ISI segment RC-043 which includes four welds. The segment islocated in the Westinghouse Risk Matrix Region 2 (Perdue Model Sample), and thesample size required all welds to be examined. Thermal stratification was postulatedand used for the examination criteria. Three of the four examined welds had limited



coverage and are included on this list: weld # 41 with 50% coverage, weld # 42 with83.35% coverage, and weld # SW-43 with 22% coverage. The one additional weld hadcomplete coverage. Since all of the welds on the segment were selected forexamination, there are no acceptable alternatives and the welds were examined to theextent possible.

Weld 42 downstream axial examination is limited due to the coupling configuration on thedownstream side. Additional"Best Effort" scans with a 60 degree RL search unitobtained additional coverage of the area without an effective Code scan. Weld 42 is onRI-ISI segment RC-043 which includes four welds. See the discussion for segment RC043 with weld 41 above.

Weld SW-51 was limited both because of the nozzle configuration on the downstreamside and an adjacent weld on the upstream side. Because of the configuration of theexam volume, the exam volume is unequal on each side of the weld centerline. On thenozzle side of the weld, the volume comprises 40% of the exam volume. On the safeend side of the weld, the balance of the exam volume is 60%. Because of this, each sideof the weld coverage is multiplied by the respective percentage to achieve the totalpercentage value identified in this request. Weld SW-51 is on RI-ISI segment RC-019which includes twelve welds. Two welds were selected for examination on the segment,one received full examination coverage. In the third period, the weld with limitedcoverage was overlayed with a PWOL, and future examination will be in accordancewith the Augmented Inspection Program.

Weld 10 is a one sided exam from the pipe side (upstream) due to the pipe to valve jointconfiguration. Also, because the pipe is centrifugally cast stainless steel, no additionalactions can be taken to get better UT coverage. Weld 10 is on RI-ISI segment RC-01 0which includes two welds. The segment is located in the Westinghouse Risk MatrixRegion 2 (Perdue Model Sample), the sample size was one (1), no active damagemechanism was postulated and the default thermal fatigue mechanism was used forexamination criteria. The other weld in the segment, weld # 37 on line # 27.5"-RC-32501-01, was not examined in the third interval, but was examined in the secondinspection interval with only 64% coverage (included in relief request NDE-20). RI-ISIsegments RC-010, RC-011, and RC-012 are similar but on different loops. Each ofthese segments include two welds with a sample size of one (1). Weld 10 received 39%coverage, weld 38 received 75% coverage (before specific Code requirements for singlesided examinations), and weld 34 received 8.33% coverage. The loop piping is notpostulated with an active damage mechanism and is represented with fifteen RI-ISIsegments, each requiring at least one examination.

Weld SW-41 is limited on the upstream side of the weld because this is a branchconnection. The exam required a best effort exam using a flat RTD 45 degree searchunit to obtain maximum Code coverage. Weld SW-41 is the branch weld on RI-ISIsegment RC-041. This segment has five welds in the population. The segment islocated on Westinghouse Risk Matrix Region 2 (Perdue Model Sample), with the samplesize requiring at least three welds be examined. Thermal stratification was postulatedand used for the examination criteria. All five welds in the segment were examined, withonly weld SW-41 limited to 35% coverage. One of the other welds on the segment withcomplete coverage provides an acceptable alternative for this limited examination.

Weld 38 is limited due to weld joint configuration (pump to pipe) and the material type.



Because the pipe is centrifugally cast stainless steel, no additional actions can be takento get better UT coverage. The 45° scans included multiple search units to get thecoverage obtained, and total coverage includes all the scans. Weld 38 is on RI-ISIsegment RC-011 which includes two welds. Discussion of this segment is included withthe weld 10 paragraph above. Second interval relief was granted for weld 38 in reliefrequest NDE-47 with 52.5% coverage.

Weld 34 is limited due to the pipe to valve configuration. The 45 degree circumferentialscan could not be accomplished due to the transducer wedge contour. No coverage ofthe area of interest (inner 1/3 volume) could be achieved. The contoured wedges wouldnot permit skewing of the transducers to target the exam area volume. Also, becausethe pipe is centrifugally cast stainless steel, no additional actions can be taken to getbetter UT coverage. Weld 34 is on RI-ISI segment RC-012 which includes two welds.Discussion of this segment is included with the weld 10 paragraph above. The otherweld in this segment, weld 33, was examined in the second interval with limitedexamination coverage.

Weld SW-43 is limited due to the nozzle to cold leg configuration. Because the pipe iscentrifugally cast stainless steel, no additional actions can be taken to get better UTcoverage. Weld SW-43 is on RI-ISI segment RC-043 which includes four welds. Seethe discussion for segment RC-043 with weld 41 above.

Weld 19 is limited as a single sided exam due to valve to elbow configuration. Weld 19is on RI-ISI segment RC-049 which includes four welds, two of which were examined.Weld 19 received 50% coverage and weld SW-1, added as a result of the limitedcoverage, received full coverage, which provides good representative coverage for thesegment.

Weld N-SE29 IN. on 29-RC-4 is limited due to weld joint configuration and the distanceof the examination area from the nozzle to bowl radius. There was no specific dissimilarmetal weld procedure at the time of this examination, and coverage calculations wouldbe different later in the interval with updated procedures. This weld was re-examined inN1 R20 using a phased array technique under the augmented program with no reportableindications. This weld in on RI-ISI segment RC-005 which includes three welds, withonly this one selected for examination. Second lSI interval relief request NDE-26 wasgranted for similar coverage.

Weld N-SE31 IN. on 31-RC-5 is limited due to weld joint configuration and the distanceof the examination area from the nozzle to bowl radius. There was no specific dissimilarmetal weld procedure at the time of this examination, and coverage calculations wouldbe different later in the interval with updated procedures. This weld was re-examined inN1R20 using a phased array technique under the augmented program with no reportableindications. This weld is on RI-ISI segment RC-008 which includes seven welds, withonly this one selected for examination. Second lSI interval relief request NDE-26 wasgranted for similar coverage.



Weld 21 is limited due to single sided access because of the tee to valve configuration.Weld 21 is on RI-ISI segment ECC-020 and is one of seven welds on the segment.Weld 21 received 48% coverage, and weld 43, added as a result of the limitation,received full coverage, which provides good representative coverage for the segment.

Weld N-SE31 IN. on 31-RC-8 is limited due to the nozzle configuration. This weld is onRI-ISI segment RC-009 which includes seven welds, with only this one selected forexamination. Second lSI interval relief request NDE-26 was granted for similar coverageand NDE-47 indicates 78.8% coverage.

5.R1 BURDEN CAUSED BY COMPLIANCE

The purpose of nondestructive examination (NDE) is to perform inspections withoutdestroying the component. Any actions necessary to make these welds accessible forNDE exam would be contrary to the intent of the Code. Design modifications would benecessary to provide sufficient access, and imposition of this requirement would cause aconsiderable burden.

6.R1 PROPOSED ALTERNATIVE AND BASIS

It is proposed that the examinations already completed at the reduced coverage becounted as meeting the Code requirements. The limited volumetric examination shoulddetect any general patterns of degradation that may occur in the areas covered,therefore providing reasonable assurance of the continued structural integrity of thesubject weld. A portion of each of the subject welds was examined volumetrically, and inmost cases a 100% surface examination was performed. In addition, these weldsreceive a visual examination during the system leakage test. Therefore, any pattern ofdegradation should be detected by these examinations ensuring reasonable assuranceof operational readiness.



Figure R1-111715-WMKS-0103AD/6-RC-21/18

FLOW

Weld-a-let

c 45° _.»:

... -.-----/-·-:/~eld Thickness/ Weld Length

// Weld Width

//

/ Elbowr-

0.718"20.8"0.90"


Table R1-111715-WMKS-0103AD/6-RC-21/18

Coverage Summary

Angle Required Scans leach scan has a IJ\leighting factor of 100 for complete coverage)

UpSt-Ax UpSt-CW UpSt-eCW DnSt-Ax DnSt-CW DnSt-CCW

45 100% 100% 100% 100% 100%

60 Rl 100%



Notes:


volume that is effectively examined VJUh the qualified examination procedure.

2i Best Effort Coverage refers to the required examination volume past the weldj

centerline that is examined wtth an Appendix vm demonstrated procedure for




Figure R1-211715-WMKS-0103W/6-RC-20/41

FLOW

Valve___ ...- -.1


Elbow

0.718"20.8"0.90"

Table R1-211715-WMKS-0103W/6-RC-20/41

Coverage SummaryAngle Required Scans (each scan hasa weighttng factor of 100 for complete coverage)


45 l00~:to 100~:'6

60 100%

60 RL 100%

! Code Coverage Total 50:1'0I

I Best Effort Coverage (Max 50%) Total 16.67%

I Notes:

l' Code Coverage refers 'to the maximum percentage of the required examinationI



centerline that is examined wtth an Appendix VIII demonstrated procedure for

single Sided coverage.



Figure R1-311715-WMKS-0103W/6-RC-20/42

FLOW

0.718"20.8"0.90"

CouplingPipe

et..r--16ooR~J

"\ ~ -7----, ~\ '"""-\ I <,

'"..- 'I _...- ....- .-"'..\ I :"~

----..-.-.l---'Vveld Thickness

Box Dimensions =H - 0.239" L - 1.9" Weld LengthWeld Width

Table R1-311715-WMKS-0103W/6-RC-20/42

Coverage SummaryAngle ReqUired Scans (each scan has a weighting factor of 100 for complete coverage)

UpSt-Ax UpSt-CW UpSt-CCW DnSt-Ax o-se-cw DnSt-CCW

45 100% 100% 100% 100%

60 100%

60 Rl 100%

I Code Coverage Total 83.35%iI Best Effort Coverage (Max 50%) Total 16.67%

! Notes:I

I"; Code Coverage refers to the maximum percentage of the required examination!


2\ Best Effort Coverage refers to the required examination volume past the weld!

centerline that 1S examined wrth an Appendix \/m demonstrated procedure for




Figure R1-411715-WMKS-01 09D/14-RC-1 O/SW-51

..4" to ClampQlaI"D(jj

~,","r------

Pipe

0rn

"DeW

2QlCll U

rJJCll--'tQl Ql0_I-E"D(jj

....J---.U

"D(jj

~

(jjeou Qle u

'::::: CllQl'to Ql1--e"D -(jj

~

(jjcooE Ql::::'UQl CllQl't- QlrJJ_eEo.0(ij

Nozzle2 Side

.......4.--_~ .

FLOW

Table R1-411715-WMKS-01 09D/14-RC-1 O/SW-51


(degrees) Direction45 Nozzte. Buttering & Weld (2 Side) 2 91

45 Nozzle, Buttering & \Neid (2Side) 5 49

45 Nozzle, Buttering & VJeld (2 Side) 7 100

45 Nozzle, Buttering & Weld (2 Side) 8, 100Total fortine 2Side 340

322% +4= 85

85% x 40% = 34

70 Safe End &We!d (5 Side) 2 0

70 Safe End & Weld ~5 Side} 5 9

70 Safe End & Weld ~5 Side} 7 100

70 Safe End & Weld (5 Side) 8, 100

Total for tine 5 Side 209

209':10 +4 = 52

52% x 60% = 31

2. Side Coverage 34%

5 Side Coverage 31%

Total

Percent 65%

CoverageUT Scan Direction Definitions2 - Axial scan, 180 degrees from isometric flow direction (weld count).5 - Axial scan, the same direction as the isometric flow (weld count).7 - Circumferential scan, clockwise rotation when viewing in the direction of isometric flow.8 - Circumferential scan, counterclockwise rotation when viewing in the direction of isometric flow.



Figure R1-511715-WMKS-0109E-1/27 1/2-RC-3/10

FLOW...Weld ThicknessWeld LengthWeld Width

2.30"86"2.375"

Valve

\

\\

\

\

\

,\

'- ..,

I

/_/

,II)

II

I

45° TRL,,,,,,,,,,,,,,,,,,,,Pipe

Table R1-511715-WMKS-0109E-1/27 1/2-RC-3/10

Coverage Summary

Angle Required Scans (each scan has a wetghttng factor of 100 for complete coverage)

UpSt·Ax UpSt-CW UpSt-CCW OnSt-Ax DnSt-CW OnSt-eCW

45 56% 100% 100%


Notes:

I} Code Coverage refers to tine maximum percentage of tine required examination

volume that is effecUvely examined wttn the qualified examination procedure.



Figure R1-611715-WMKS-0109E-2/27 1/2-RC-3/SW-41

FLOW

JWeld Width 2.25" Nozzle

D--(\.

o·/}------'

Table R1-611715-WMKS-0109E-2/27 1/2-RC-3/SW-41

Coverage SummaryAngle Required Scans (each scan has a weighting factor of 100 for complete coverage)

UpSt-Ax UpSt-CW UpSt-CCW OnSt-Ax DnSt-CW DnSt-CCW

45 83% 28% 28%


Notes:

1) Code Coverage refers to the maximum percentage of tine required examination

volume that is effect@vely examined with the qualified examination procedure.



Figure R1-711715-WMKS-0109F-1/271/2-RC-6/38

Pump

Pipe

Weld Length 86"Weld Width 1.7"

--...._-

Table R1-711715-WMKS-0109F-1/271/2-RC-6/38

BeamScanAngle Exam Area Scan 0/0Direction(degrees)

45 RTD/45RL DnSt-Ax 6745 RTD/45RL UpSt-Ax 045 RTD/45RL DnSt-CW 10045 RTD/45RL DnSt-CCW 100

60 RTD DnSt-Ax 10060 RTD UpSt-Ax 0

TotalPercent 75%

Coverage



Figure R1-811715-WMKS-0109G-1/27 1/2-RC-9/34

Table R1-811715-WMKS-0109G-1/27 1/2-RC-9/34

!

Coverage Summary

Angle ReqUired Scans (each scan has a weighting factor of 100 for complete coverage)


45 Rl 33.33%


Notes:


volume that is effectively examined vvitn the qualified examination procedure.



Figure R1-911715-WMKS-0109G-2/27 1/2-RC-9/SW-43

Cold Leg

Weld Thickness 2.3"Weld Length 27"Weld Width 2.5"

.:////

~~)'/

/

//

~--~./ ,

I

L - 2.25"

I~

""--'"---~-------...J........ _

"Tlros

Nozzle


Table R1-911715-WMKS-0109G-2/271/2-RC-9/SW-43

r Coverage Summary

Angle Required Scans (each scan has a weighting factor of 100 for complete coverage)


45 76% 28% 28%


Notes:

1J Code Coverage refers to the maximum percentage of the required examination




Figure R1-1011715-WMKS-0111 BB/3-CH-1/19

R..ONWeld ThicknessWeld LengthWeld Width

ELBJW

.448"11"0.75"

/

~' ... '.. / /"jiiijj - ~;/ r > r......•.. (d~

-----

VPLVE

.486' .432" .448' .M

~5(lJ,CO[l: COVERAGE

,f/,/,// ,,/ /

/ / / //~/ / < , BEST EFFORT 7llIlOGREE.fJl so IN

~EAOFNOEXAMlf'Ot,TION.08SO IN

Exam Volume Dimensions = H - 0.14" L - 11" W - 1.75"

Table R1-1011715-WMKS-0111 BB/3-CH-1/19

NOT TO SCALE

Coverage Summary

Angle ReqUired Scans (each scan hasa weighting factor of 100 for complete coverage): UpSt-Ax UpSt-Circ DnSt-Ax DnSt-Circ

45 100%

70 47% 100


Best Effort Coverage (Max 50%) Total 12%

Notes:



2) Best Effort Coverage refers to the requtred examination volume past the weld

centerline that is examined wrth an Appendix Viii demonstrated procedure for




Figure R1-1111715-WMKS-RC-E-1 B.2/29-RC-4/N-SE29 IN.11715-WMKS-RC-E-1 B.2/31-RC-5/N-SE31 IN.

Weld Width 1.75"

Nozzle

Pipe

,/!-._--~-C-:-

/! \\\\.'\\ -.1\\\' '\ \ -,\,\,\ \ -,\\\\\~ /

~..J ... -- ..NOT TO SCALE

Table R1-1111715-WMKS-RC-E-1 B.2/29-RC-4/N-SE29 IN.


(degrees) Direction34 Bottom 1/3T 5 100

45 Bottom 1/3T 7 100

45 Bottom 1/3T 8 100

45 Bottom l/3T 2 19

:

Total

Percent 80%

Coverage


2 - Axial scan, 180 degrees from isometric flow direction (weld count).5 - Axial scan, the same direction as the isometric flow (weld count).7 - Circumferential scan, clockwise rotation when viewing in the direction of isometric flow.8 - Circumferential scan, counterclockwise rotation when viewing in the direction of isometric flow.

Serial No. 10-013DocketNo. 50-338

NAPS Unit 1 3rd IntervalLimited ExamsPage 58 of 61

Table R1-1211715-WMKS-RC-E-1 B.2/31-RC-4/N-SE31 IN.

Beam Angle ScanScan %Exam Area

(degrees) Direction34 Bottom 1/3T 2 100

45 Bottom 1/3T 7 100

45 Bottom 1/3T 8 100

45 Bottom 1/3 T 5 15

I

Total

Percent 79%

Coverage


c' - Axial scan, 180 degrees from isometric flow direction (weld count).5 - Axial scan, the same direction as the isometric flow (weld count).7 - Circumferential scan, clockwise rotation when viewing in the direction of isometric flow.S - Circumferential scan, counterclockwise rotation when viewing in the direction of isometric flow.



Figure R1-1211715-WMK5-01031<16-51-131/21

FLOIV

1EE

45

V/iLVE.

.73"21"1"


L- 21" W - 2"

so AR:A EXAMINED-, BEST B=FORf

• OBS1RLCTED OlE TO CON=IGURAllO-J

Exam Volume Dimensions = H - 0.24"

Table R1-1311715-WMK5-01031<16-51-131/21

Coverage Summary

Angle Required Scans (each scan hasa weighttngtactor of 100 for complete coverage)

UpSt-Ax UpSt-Circ OnSt-Ax OnSt-Circ

45 100%

45/70 92%

60 Rl 21%

Code Coverage Total 48~!o

Be.st Effort Coverage (Max 50%) Total 5%

Notes:




centerlrne that is examined with an Appendix vm demonstrated procedure for

single Sided coverage.



Figure R1-1311715-WMKS-RC-E-1 C.2/31-RC-8/N-SE31 IN.

4.R4 il

Bl1llYing

SE

Weld Thickness 4.84"Weld Length 130"Weld Width 1.5"

1'DT10 SCAlE

11• Taper

Exam Volume Dimensions = H - 1.6" L - 130" W - 2.5"

Table R1-1411715-WMKS-RC-E-1 C.2/31-RC-8/N-SE31 IN.

Coverage Summary

Angle Required Scans(each scan has a weighting factor of 100 for complete coverage)

UpSt-Ax UpSt-Circ DnSt-Ax DnSt-Circ

345 100%

40 5 100% 100%

40 L 100% 100%


Best Effort Coverage (Max 50%) Total 25%

Notes:



2'1 Best Effort Coverage refers to the required examination volume past the weld,I

centerline that is examined VJith an Appendix vm demonstrated procedure for




7.0 DURATION OF PROPOSED ALTERNATIVE

This proposed alternative in this request if approved will be applicable for the third 10 year lSIinterval for NAPS 1 which ended April 30, 2009.

8.0 PRECEDENTS

Similar relief was granted in the Second Inservice Inspection (lSI) Interval, as follows:

1. Relief Request NDE-19, NRC Letter dated 8/7/1995 (TAC No. M89620)2. Relief Request NDE-20, NRC Letter dated 8/7/1995 (TAC No. M89620)3. Relief Request NDE-26, NRC Letter dated 11/17/1995 (TAC No. M92991)4. Relief Request NDE-38, NRC Letter dated 2/2/1999 (TAC No. MA0410)5. Relief Request NDE-47, NRC Letter dated 2/15/2000 (TAC No. MA6113)6. Relief Request NDE-48, NRC Letter dated 2/15/2000 (TAC No. MA6113)7. Relief Request NDE-49, NRC Letter dated 3/26/2001 (TAC No. MB0393)8. Relief Request For Alternative Examination Of Weld 4, NRC Letter dated 5/14/2001 (TAC

No. MA8915)

9.0 REFERENCES

1. ASME Code Section XI, 1989 Edition with No Addenda.2. Relief Request NDE-6, NRC Letter dated 4/25/2000 (TAC No. MA5750)3. ASME Code Case N-460, "Alternative Examination Coverage for Class 1 and Class 2

Welds"

north anna, unit 1, asme section xi inservice inspection ... · n1-13-prt-004 unit 1 third interval...

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