ENCLOSURE 2 TO NL-13-147

IP-CALC-13-00070, RI

LEAK REPAIR CLAMP EVALUATION FOR LINE 1093 IN

32 MAIN TRANSFORMER MOAT

ENTERGY NUCLEAR OPERATIONS, INC.INDIAN POINT NUCLEAR GENERATING UNIT NO. 3

DOCKET NO. 50-286

1.0 ENGINEERING CALCULATION COVER PAGESheet I of 2

El AND-1 E] ANO-2 El GGNS 0l IP-2 El IP-3 El PLP

CQ JAF F1 PNPS ] RBS [] VY [1 W3

El NP-GGNS-3 El NP-RBS-3

CALCULATION (') EC # 47124 (2)Page I of 5COVER PAGE

(3) Design Basis Calc. [l YES Z NO (4) Z CALCULATION E" EC Markup

(5) Calculation No: IP-CALC-13-00070 .(6"Revision: I

(7) Title: Leak Repair Clamp Evaluation for Line 1093 in 32 Main Transformer _01 EditorialMoat [I YES ONO(' System(s): SW Review Org (Department): Civil/Structural

(11) Safety Class: (12) Component/Equipment/StructureType/Number:___________

[ Safety I Quality Related 32 /man ra32 Main Transformer

El Augmented Quality Program Moat

E- Non-Safety Related

113) Document Type: CALC

(14) Keywords (Description/Topical

Codes):

_'_ REVIEWS(,s) Name/Signature/Daten (16) Name/Si nature/Date (7) Name/ n nr tr/MtKai Lo 10-30-2013/ G. BhalIa. R. Drake

Responsible Engineer [ Design Verifier l Supesor/Alproval] Reviewer

__ Comments Attached [i Comments Attached

3

EN-DC-126 REV 4

2.0 CALCULATION REFERENCE SHEET

Page 2 of 5

CALCULATION CALCULATION NO: IP-CALC-13-00070REFERENCE SHEET REVISION: 1

I. EC Markups Incorporated (N/A to NP calculations)NoneI1. Relationships: Sht Rev Input Output Impact Tracking

Doc Doc Y/N No.

1. 0 0.2. 0 0III. CROSS REFERENCES:

1. IP3 Piping Specification, TS-MS-027

2. USAS B31.1, Power Piping Code, 1967 edition

3. Drawing 9321-22363 (Piping)

4. IP3-UT-13-058

5. ANVIL Catalog

6. CR-IP3-2013-04174

7. CR-IP3-2013-04416

8. IP3-VT-13-021

IV. SOFTWARE USED:

Title: Version/Release: Disk/CD No.

V. DISK/CDS INCLUDED:

Title: Version/Release Disk/CD No.

VI. OTHER CHANGES: None

EN-DC-126 REV 4

3.0 Rmono OF REVIS(ONPage 3 of 5

lRelwsion, Oi. bi: Rodf Revis'ion'Initial issue.

0

Revised calculation due new flaw length

EN-DC-126 REV 4

4.0 TABLE OF CONTENTS PAGE 4 OF 5

1

2

3

4

5

6

7

8

9

10

Calculation Cover Page ..................................................................

Calculation Reference Sheet ..................................................................

Record of Revisions

Table of Contents

Purpose ..................................................................

Conclusion ....................................... ......................

Input and Design Criteria ..................................................................

Assumptions ...................................................................

Method of Analysis ..................................................................

Calculation ...................................................................

Attachment 1: Calculation (2 pages)

Attachment II: Miscellaneous reference material used for calculation (6 page)

Total number of pages: 15

Pacie No.

1

2

3

4

5

5

5

5

5

5

EN-DC-126 REV 4

Page 5 of 55.0 Purpose

In the moat of the 32 transformer yard, an area was identified of missing metal of the pipe wall thickness due to

external surface corrosion. The degraded pipe location is in the ISI Class 3 code boundary (See CR-IP3-2013-

04174). CC-N-513-3 was invoked and the degraded piping is structurally adequate. A red rubber patch will be

placed on the defective pipe surface held tight to prevent any potential water leakage by means of a pipe damp.

The following pipe stress evaluation is needed due to the addition of the pipe damp and the large flaw size:

1. The additional weight of the clamp on the pipe stress.2. The clamping pressure acting on the pipe.

3. Ensure the compressive clamping pressure is greater than the pipe's design pressure to prevent water

from leaking out.

6.0 Conclusion

The additional weight of the pipe damp onto the piping will result in insignificant increase of pipe stress. Based

on the VT report, a 12"x6" red rubber pad, 1/4" for the thickness of the rubber pad, and 1116" maximum

compressive deformation of the rubber pad, the compressive pipe membrane stress will be below the allowable

stress limit. The compressive pressure is greater than the pipe's design pressure and water cannot leak out.

7.0 Input and Design Criteria

1. Piping material: A53 Gr B, schedule 40 per specification TS-MS-027

2. Allowable pipe stress and piping code: St = 15 ksi, B31.1 Power Piping Code, 1967 edition3. An average Durometer hardness of 70 for red rubber material.

4. 8" wide pipe clamp from Figure 432 of ANVIL catalog.

8.0 Assumptions1. Actual weight of the pipe clamp is less than 18 Ibs, but 25 lbs is used conservatively.

2. Fig. 432 pipe guide is used as a clamp.

3. A 12" x 6" red rubber pad is a placed at the defective externally corroded area.

4. The thickness of the red rubber is 1/4".

5. 1/16" compression of the red rubber pad is allowed to limit the compressive stress on the pipe.

9.0 Method of analysis

The stress of the pipe induced by the damping force is evaluated using case 17 from table 30 of Roark's

"Formulas of Stress and Strain".

10.0 Calculation

See Attachment I

EN-DC-126 REV 4

Attachment I

Calculation

EN-DC- 126 REV 4

IP-CALC-13-00070 Rev. 0 Page

Determine the additional bending stress induced by the additional pipe clamp

W = weight of clamp = 25 lb (cons)

p = design pressure= i.150 psi

d = outside diameter ::10.75 in

t= nominal wall thickness = 0.365, in

S section modulus = 29.9 :1in3

L=pipespan= 8 ::::ft= 96 inSh = allowable stress 15000.. psi

Conservatively consider the pipe is pinned at support ends

Ma = moment due to OW = WLJ4 = 600 in-lb

fb = bending stress = MaJS = 20 psi

fb/Sh = ratio of additional stress to the allow limit = 0.13% negligible

Determine the compressive stress induced by the clamping force

SA= Durometer Shore A hardness of red rubber -. 70

log E = 0 .0 2 3 5 SA - 06403 = 1.0047

E = modulus of elasticity = 10.11 MPA = 1466 psi

w = width of ruber pad axially = 6.0 in

I bearing length circumferentially = 12.0 in

V = thickness of red rubber pad = ,0.25:ý,.. in

5 deformation due to compression = 0.0625 in

A' = defective surface area externally corroded = 2.5"(8.25") = 19.0 in2

A = area of pad being compressed = wl - A' = 53.00 in2

P compressive force acting on the rubber pad = 8AE/t' = 19427 lb

Using the case 17 from Table 30 of Roark's "Formulas of Stresses and Strain"

v = poisson ratio 0.3

E = modulus of elasticity = 2.79E+07 psi

R = mean pipe radius = 0.5(d - t) = 5.1925 in

= (3(1-v )/(R t2]O = 0.934 in"

D = Et3/112(1-v)]= 124240 in-lb

The external uniform compressive pressure will be offset by the 150 psi internal pressure

q = external uniform pressure = P/A - p = 217 psi

a = w/2 3.0 in

Xa= 2801

At x = 0, Max M = (q/2X•)e(X""sin(Xa) 2.52

ar'1 m meridional bending stress = -6M/t 2 = -113 psi < Sh = 15000 psi, o.k.

2'z = circumferential bending stress = va'= -34 psi

At x = 0, Max y = (-q/4DK4 )[1 - e(Ka)cos(Xa) = -0.0006 in

C02 = circumferential membrane stress = yE/R + va 1 = -3291 psi < Sh = 15000 psi

Since external clamping pressure is compressive, greater than the pipe's design pressure,

water will not leak out.The minimum wall thickness required for the pipe's hoop stress is 0.054" per IP3-CALC-13-00062.

The thickness of the pipe clamp is 3/16", more than adequate to hold the pipe pressure.

/ Of2

Attachment II

Miscellaneous Reference Information

EN-DC-126 REV 4

____ Visual Exam

- EntergySitelUnit; IP3 1 3

Summary No.: SW Line 1093

Workscope: BOP

of Equipment and Components (VT-3)

Procedure:

Procedure Rev.:

Work Order No.:

CEP-NDE-0903

5

00350692-31

Outage No.: N/A

Report No.: lP3-VT-13-021

Page: 1 of I

Code: ANSI B31.1, 67 - 69 ED Cat./Ittem: NIA Location: Unit #3 Moat Excavation.

Drawing No.: 9321-F-22363 Description: Visually Examine 10" Line #1093 After Removal of Support.

System ID: Service Water

Component ID: 10" SW Line 41093

Limitations: Limited Room on the Bottom Side of the Pipe.

Resolution: 0.105" Character Card Surface Condition: In Service

Light Meter Mfg.: NIA Serial No.: NIA Illumination: SAT

Light Verification Times: Cal In E NIA I NIA NIA Cal Out [3 N/A

Visual EquipmenrlAids: Flashlight, Mirror, Camera, Tape Measure

Lo Location: Top of Pipe Wo Location: Centerline of the eroded area

Visual Examination: Direct

Comments:

Further Examination of Line No, 1093 revealed that the corroded area originally found extended underneath the pipe to thearea that was resting on the wood support. Area measures 8-1/4" circumferentlally and 2" wide in the axial direction.

Results: Accept Reject [ Info )ý Ref CR-)P3,2013-04416 and IP3-UT-13-058

Percent Of Coverage Obtained > 90%: NIA Reviewed Previous Data: Yes

Examiner Level II Date Reviewer Signature DatePeterson, Joseph F. 1012912013 -m,,'tIV/,I

Exmlr Leve Sgatr Date S ~ew A a rDate

Other Level Signature Date ANII Review . '..nature

tA ____A

go, Entergy

Supplemental ReportReport No.: IP3-UT-13-058

Page: 7 of 7

Summary No.: 10" Line # 1093

Examiner. Allen, Robert E.

Examiner: NIA

Other: WA

0 L. Level: fi EOLevel: NIA

Level: NIA

Reviewer X)

Site Review:ANII Revlei $/,• -

Date:

Date:

Comments: Area 3 UTT and pit gage readings.

Sketch or Photo: \\Client\Y$MtddeaI Ver 81JddealServerUDDEAL_|P3\Graphics-Pictures\Service Water10 In Line 1093 Area 3.TIF

t'4 eel-A

j,-z,:50qPX7-I 'Z-womL

Vr- 4ý A&6 *UA0(h-VA CP fIq PACM14 '.- - A- I AS

A

eZ- "A-Soo"

6 : ;7L

1/4 " fI IkZ~L~

'(I;-4. 1-

z. I I, '' I] /,tlib

-Enterloy

Visual Exam of Equipment and Components (VT-3)

Site/Unit: IP3 / 3

Summary No.: SW Line 1093

Workscope: BOP

Procedure: CEP-NDE-0903

Procedure Rev.: 5

Work Order No.: 00350692-31

Outage No.: N/A

Report No.: IP3-VT-13-021

Page: 1 of 1

Code: ANSI B3i.1, 67 - 69 ED Cat./Item: NIA Location: Unit #3 Moat Excavation.

Drawing No.: 9321-F-22363 Description: Visually Examine 10" Line #1093 After Removal of Support.

System ID: Service Water

Component ID: 10" SW Line #1093

Limitations: Limited Room on the Bottom Side of the Pipe.

Resolution: 0.105" Character Card Surface Condition: In Service

Light Meter Mfg.: N/A Serial No.: N/A Illumination: SAT

Light Verification Times: Cal In [] N/A I N/A / NIA Cal Out U N/A

Visual Equipment/Aids: Flashlight, Mirror, Camera, Tape Measure

Lo Location: Top of Pipe Wo Location: Centerline of the eroded area

Visual Examination: Direct

Loc Loc Loc Ind. Size Remarks

L W U/D R/L D/L

8.5" 0" N/A Linear 8.25" x 2" See comments below, the remainder of the exposed pipe_was in good condition with no corrosion

1- + * I

1- *1~ I I

-r i- t t

+ + + I I

Comments:

Further Examination of Line No. 1093 revealed that the corroded area originally found extended underneath the pipe to thearea that was resting on the wood support. Area measures 8-1/4" circumferentially and 2" wide in the axial direction.Results: Accept I Reject [ Info i.-] Ref CR-1P3-2013-04416 and IP3-UT-13-058

Percent Of Coverage Obtained > 90%: N/A Reviewed Previous Data: Yes

Examiner Level 1 S Date Reviewer Signature DatePeterson, Joseph F. 10/29/2013 ,d,

Examiner Level Signature Date eviewDate

Other Level Signature Date ANII Review

IZ-, 11IFig. 432Size Range: 2 through 24"Material Carbon steelFinisAr Plain or Galvanized

Maximum Temperature. Plain 750V F, Galvanized 450 F

for carbon steel pipe only

Service: Usedowith and where pipe slides cannot be welded

directly to pipe or copper tube. When used with fiberglass,

plastic, or aluminum pipe, a thin protective liner should be

inserted between the pipe and the clamp. Clamp is designed

for use with Figure 257 and Figures 436 and 439 slides and tees.

Ordering. Specify figure number, pipe size, name and finish.

Special Clamp", I

týFig. 257

w/Fig 432 Clamp w/Rg 3 lapFig. 439

w/Fig 432 Clamp

"4

_FIG. 432: WEIGHT (LBS) * DIMENSIONS (IN)

Pipe Size L M N P Q T Weight2 5 4 2

2h 5'h 4h 33 6 5 3

Th61 5h A4 / 44 7 6 45 8 7 .... .. 56 95A 8% 128 11% 101A 15

10 13A 12% 6 1812 15YA 143 2114 17'A 16'h 1h 4116 19' 18'h 4618 12 21'A/ 201h 8 1/ 5220 23A 22'A 5724 281A _ _. ... 261h ..... _ _ 67

41APJAL:U

What is Rubber Hardness?

The hardness of rubber compounds Is measured by the Shore A durometer, the higher thedurometer, the harder the compound. 70-durometer hardness should be used wheneverpossible as it offers the best combination of properties for most O-Rings applications.

Softer compounds stretch easier and sealbetter on rough surfaces. Hardercompounds offer greater abrasionresistance and resistance to extrusion.Extrusion must always be consideredwhere high pressure is used. The properhardness may be selected from this chartby matching the fluid pressure with themaximum extrusion gap.

60 Shore A is softer than 70.

F1

da

Durometr Chart

-Co

, JAMu ~~ =Ai

70 Shore A is the standard.

90 Shore A is very stiff.

ri

p

a"

i-S

•oe i;(It"I e*.2 @0.0 0.04

IazMUMn Cp, in hCh

The hardness of an elastomer is measured based on the depth of Indentation by a standard sizeand shape impacting gauge. The hardness Is obtained by comparing the difference between asmall initial force and a much larger final force. The International Rubber Hardness Degrees (IRHO)scale has a range. of 0 to. 100, corresponding to elastic modulus of 0 (0) and Infinite (100);1respectively. The measurement is made by Indenting a rigid ball into the rubber specimen.

The Shore A scale is the most prevalent in the United States. The readings range from 30 to 95points. Harder elastomers use a pointed conical indentor with the Shore 0 scale. The results of theShore A scale and the IRHD scale are approximately equal over the same range of resiliency. Inelastomers with unusually high rates of stress relaxation or deformation hysteresis, the difference indwell time in the two readings may cause different results. Also, the results of any hardness testdepend on the elastomer thickness. Specified thickness should be used when conducting thesetests.

Due to the mechanical limits of the test instruments, hardness measurements of elastomers arerarely expressed more precisely than 5 points.

The surface indentation or hardness usually does not bear any relation to the ability of anelastomeric part to function properly. Hardness is a measure of an elastomer's response to a smallsurface stress. Stiffness and compressive modulus measure the response to large stresses of theentire elastomeric part.

S S. -- ~55'a 5- . -' .1

'''-'-5

*5,95~5 . SjI' ~-5- IS , *~i'5.' - 55'

¶ 1.~' - S I-. 5

'S *~'~~* , - -. -

TAoLz 30 Shear, moment, sloe, and deflection formulas for long and short thin-waited c~ylindrical shells uwdfw oxisymmutgric loading (ConL)

Loading and cam* no. Load temsata otoad and deformation equatons Sdected rahiee

I&. ApplWe mor-Q mph1- = (caoxx + ain A4) Mu&Vr at xex O at 0

4d co Axna~ M~al# = -:11.&in Xx) at x = 0

4D?~ WA

J=Wdlinx daXJI=-...0403~L. ax -DA2 k

17.. Unifr prensure over aban~i o Superimpose cases 10 and 12 to make (at x0)0 a~~eanwm~

Q;dt Cam AA) atx2 S

01=

-;.7 - ---.1M."I" ".1010 01.ý.

1j~i 111 I

-~ -._q rr 13 0

2r I- a- C- i

o CA.'a o '

INMa 40r; I I & -

I- CD &6

5- cro

0n Ix0 a

co1 .

'M if II%

ko~2 ~ ~ oAA 0.