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NOLF CREEK NUCLEAR OPERATDG CORP @ATIN..

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| NOLF CREEK GENERATDG STATION

EtmILY OPERATDG REPORT r

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Ermin May YEAR: 1990 :

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Docket No.: 50-482

1' Facility Operating License No.: NPF-42i

fReport No. ,_,6.3._

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Pmpamd by:

L Merlin G. Williams1

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SIM ERY

'1he following_ report highlights the operating experience of Wolf Creek..

Geerating Station for the nonth of May,1990. 'lhis report is being* provided pursuant to Technical Wification 6.9.1.8. .

? I. SCH ERY OP OPERATING EXPERIENCE

'1he unit cmpleted its fourth refueling outage in May. '1he unit began the i

month in Made 5, Cold Shutdown; entered Mode 4, Ibt Shutdown, on May.7 at1706 hours; entered Mode 3, Hot Standby, on May 9 at 1510 hours; and entered

k: Made 2,1 Startup, on May 13 at 1702 hours. On May 14 at 0230 hours theL reactor became critical and at 1222 hours entered Mode 1, Power Operation.|- h generator was synchronized to the grid for approximately three hours at'

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|t .1746 hours on May 14 in preparation for a turbine overspeed trip test.s

Following the test a reactor trip occurred at 2137 hours due to low level inSteam Generator "C" caused by lower than nomal feedwater tannaratures, hunit as restarted frcan Mode 3 and synchronized to the grid at 0017 hours on

,' May 16. '1his marked the end of the refueling outage which lasted 67 days, ;

| 23 hours, and 50 minutes,

j _On May 17 at 1725 hours with the unit at 92% power, a leak was discovered on., the seal water return line for Main Feedwater Purnp "A". A power reductionI was initiated and the unit entered Mode 2 at 2152 hours. At 2305 hours a

reactor trip occurred due to low level in Steam Generator "C" caused by itsaLu g m.ic relief valve failing open. h leaking seal water return lineand aba peric relief valve were repaired and the unit was restarted andsynchronized to the grid at 1920 hours on May 18.

On May 19 at 2353 hours, with the unit at 98% power, a high level inMoisture Separator Drain Tank "A" caused a turbine trip which then caused areactor trip. h high drain tank level was caused by a failed check valveon a line that controls tank level, h valve was repaired and the unit wasrestarted and synchronized to the grid at 0025 hours on May 21. '1he unit-reached 100% power at 1830 hours on May 22 and renained at or near 100%power for the remainder of the nonth.

II. MAKR SAFEI"I REIATED MAINTENANCE ACTIVITIES

1. "A" Train Essential Service Water flow halance.

2. Containment hydrogen analyzer nodification to improve reliability.

3. Main Steam Isolation Valve testing.

Wolf Creek Generating StationMonthly Operating ReportMay 1990Page 1 of 6

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OPERATDG DMA REPGtPDOCKET NO. 5G 482

NOLF CREEK GENERATDG S'IATIO4NOLF CREEK NUCLEAR OPERATING CXRPCR,L'I'ITE

DATE 06-01-EQ,, 1

CCMPIRFED BY M. Willime3TELEP10NE 316-364-9Qt.

TERATDG STAMSi

1. Reporting Period: May, 1990 Gross Hours in Reporting Periods ,_734_

2. Currently Authorized Power Isvel(MNt):_.}{ n Max. Depend.-Capacity (M4e-Net):_.113.5 ||

Design Electrical Rating (MNe-Net): 1170 |

3. Power level to Which Restricted (If Any)(MNe-Net): N/A

4.- Reasons for restriction (If Any): N/A'1his Month Yr. to Date Cunulative

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5. Numoer of Hours Reactor was Critical 381.8 1959.1 32,258.5

6. Reactor Reserve Shutdown Hours 0.0 0.0 339.8t

7. Hours Generator on Line 345.0 1899.7 31,686.8,

8. Unit Reserve Shutdown H3urs 0.0 0.0 0.0

9. Gross '1hemal Energy Generated (MHH) 1,003,923 G,156,031 104,633,286 ,

10. Gross Electrical Energy Generated (MHH) 345,546 2.141,786 36,420,733

11. Het Ele.,trical Energy Generated (MWH) 316,614 2,027,810 34,750,181

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12. Reactor Service Factor 51.3 54.1 77.6

13. Reactor Availability Factor 51.3 54.1 3114. Unit Service Factor 46.4 52.4 76.2

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|I' 15. Unit Avai1ahi1ity Factor 46.4 52.4 76.2

16. Unit Capacity Factor (Using MDC) 37.5 49.3 74.0

(_ 17. Unit Capacity Factor (Using Design NWe) 36.4 47.8 71. 5 __

18. Unit Forced Outage Rate 16.5 6.0 4.7|

19. Shutdowns Scheduled Over Next 6 Months (Type, Date, and Duration of each): N/A 1

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20. If Chut Down at End of Report Period, Estimated Date of Startup: N/A1

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Wolf Creek Generating StationMonthly Operating ReportMay 1990

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Y AVERAGE DAILY WIT PONER IEv'ELDOCKET NO. 50-482 .j

1 NOLF JUEK GDERATDG SMPIN- '

''u N11F CREEK NUCLEAR OPERATDG O@PORATIN' DATE 06-01-90

O N PLETED'BY M. Wi11i=== j,,

TELEPtKME 316-364-8831- -|'

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h|6lOmi May, 1990!

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' 'IRY AVERAGE DAILY POWER LEVEL DAY AVERAGE DAILY POWER LEVEL i

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(M4e-Net)- (MNe-Net) i

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0 17 704 !. ,:.1 ! *

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;!;!i 21 0 18 -8

3~ 0 19 705 l'

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4~ 0 20 0.

!5 0 21 481

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- 6' O 22 1071m

U ;7 0 23 1146

8 0 24 1147n,

9 0 25 1146

10 0 26 1146

ill 0 27 1147

'12 0 28. 1148

13' O 29 1147

s 14 0 30 1147

15 0 31 1146,

16> 388

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'' Wolf Creek Generating StationMonthly Operating Report

,4 May 1990Page 3 of 6

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UNIT SHUTDOWN AND POWER REDUCTIONS .

50-482DOCRET NO.WOLF CREEK GENERATING STATION

WOLF rmrmit NUCLEAR OPERATING CORPORATIONDATE 06- 0.".- 90.

COMPLETED BT M. Wi. lianaTELEPHONE 316-3M-8831

REPORT MONTH May. 1990

TYPE METHODS SHUTTINGF: FORCED DURATION REASON DCWN THE REACTOR CORRECTIVE ACTIONS /C009ENTS

No Date S: SCHEDULED (HOURS) (1) OR REDUCING POWER (2)

4 900501 S 329.8 C 4 Continued scheduled refueling outage.

5 900514 F 22.4 G 3 Reactor trip due to steam generator low level caused bylow feedwater temperature. (Licensee Event Report90-011-00 due June 13. 1990.)

6 900515 S 0.7 B 1 Performance of Main Turbine Overspeed Test.

7 900517 F 21.6 A 1/3 Manual shutdown from 92Z due to feedwater pump seal lineleak: reactor trip from OZ due to steam generator lowlevel. (Licensee Event Report 90-012-00, dueJune 16. 1990.)

8 900519 F 24.5 A 3 Reactor trip due to high water level in Moisture SeparatorDrain Tank. (Licensee Event Report 90-013-00 dueJune 18. 1990.)

SMSWhRY: The unit completed its fourth refueling outage on May 16, 1990. Three reactor trips occurred: one near the endof the uutage due to operational error and two shortly afterwards due to minor equipment problems. Followingthese events the unit operated at or near 100Z for the remainder of the month.

1) REASON: A: EQUIPMENT FAILURE (EKPLAIN) E: OPERATOR TRAINING AND LICENSE EKAMINATION (2) METHOD:1. MANUAL

B: MAINTENANCE OR TEST F: ADMINISTRATIVE 2. MANUAL SCRAM

C: REFUELING G: OPERATIONAL ERROR (EXPLAIN) 3. AUTOMATIC SCRAM4. CONTINUEDD: REGULATORT RESTRICTION B: OTHER (EXPLAIN)5. REDUCED IAAD9. OTHER

Wolf Creek Generating StationMonthly Operating ReportMay 1990Page 4 of 6

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W2E CREEK NUCLEAR CPERATDG C%PCRATICH

W37 CREEK GENERATDC SThTICH

LMIT IG.1

30 01 Mav, 1990

SGMARY OF OPERATDG IXPERIDGE

Listed belw in chronological sequence is a sumary of operating experiences for this acnthwhich required load reduction or resulted in significant non-load related incidents.

D!E M .EVDC

May 1, 1990 0000 hours tlnit in Mode 5 - Cold Shutdown. ContinuingRefueling Outage activities.

May 7, 1990 1706 hours Entered Mode 4 - Hot Shutdown.

May 9, 1990 1510 hours Enterui Mode 3 - }bt Standby. !

May 13, 1990 1702 hours Entered Mode 2 - Startup.

May 14, 1990 0230 hours Reactor critical.1222 hours Entered Mode 1 - Power Operation.2137 hours Reactor trip - low level Steam Generator "C".

May 15, 1990 1302 hours Entered Mode 2 - Startup.1419 hours Reactor critical.1422 hours Entered Mode 1 - Power Open tion.

May 16, 1990 0017 hours Generator synchronized to the grid. Refuelingoutage emplete.

May 17, 1990 1725 hours Began decreasing power from 92% due to a leak on theseal water return line for Main Feedwater Punp "A".

2152 hours Entered )bde 2 - Startup.2305 hours Reactor trip - low level Steam Generator "C".

May 18, 1990 1155 hours Entered Mode 2 - Startup.1235 hours Reactor critical.1727 hours Entered Mode 1 - Power Operation.1920 hours Generator synchronized to the grid.

Wolf Creek Generating StationManthly Operating ReportMay 1990Page 5 of 6

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stb 00RY CF OPBETDG EKPERIBBCE (XNP.!

XB25 23E 3EEEt

May 19, 1990 2353 hcurs Reactor trip - high water level in MoistureSeparator Drain Tank *A". |

May 20, 1990' 1702 hours Entered Mode 2 - Startup.1724 hcurs Reactor critical.1911 hcurs attered Mode 1 - Power Operation.

May 21, 1990 0025 hours Generator synchrmised to the grid.

May 22, 1990 1830 hours thit at 100% power.,

May 31, 1990 2400 hours Continuing operation at 100% pcuar.

Wolf Creek Generating Stationhthly Operating ReportMay 1990Page 6 of 6

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