ML20079B270

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Monthly Operating Repts for May 1991 for Limerick Generating Station,Units 1 & 2
ML20079B270
Person / Time
Site: Limerick  Constellation icon.png
Issue date: 05/31/1991
From: Leitch G, Meck K
PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC
To:
NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
NUDOCS 9106140180
Download: ML20079B270 (12)
v • d • e


Text

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3917084470 ,,3,c,,,1,.

, PHILADELPHI A ELECTRIC COM PANY LIMEHlCK OENER ATING ST ATION P. O. Box A S AN ATCG A, PENNSYLV ANI A 19464 (Ill) 3371200, EXT. K00 i

o,. w a .. aircw Juno 7, 1991

,,a. n. ..r Docket lion. 50-352 50-353 License llos. IIPP-39

, NPF-85 U. S. Iluclear Pogulatory Commission Attnt Document Control Desk Washington, DC 20555 Subject Limorick Generating Station Monsh'.y Operating Report For Unita 1 and 2 Enclosed are the monthly operating reports for Limerick Units 1 and 2 for the month of May, 1991 forwarded pursuant to Technical Specification 6.9.1.6.

Verytply urs, ..

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/

KWM/dms Enclosuro cca T. T. Martin, Administrator, Region I, USliRC T. J. Kenny, US!1RC .conior Resident Inspector 9106140180 910531 PDR ADOCK 05000712 R PDR ,,

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DATE 0G/06/91 13:5S NRMS DOCUMENT CONTROL FORM STQUENCE H 3917084470 NRC MONTHLY OPERATING REPORT STATION LGS

                                                                  • .***,,*******-***************(*******************
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  • BHATTACHARYYA, A. LGS /335 01 1++ ________.,____________________, ,_*
  • BUSINESS UNIT CD/528-7 01 I** ______________________________ _ __* 3
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  • COLTER, S. OUTGOING 01 I** ______________________________________
  • REQUESTS FOR CHANGES TO THIS DISTRIBUTION LIST MUST BE ADDRESSED TO THE ORGANIZATION RESPONSIBLE FOR ORIGINATING THE ATTACHED DOCUMENT (SEE NUCLEAR RELATED DOCUMENT REGISTER (NRDR) FOR RESP. ORG.). THE RESP. ORG. WILL AUTHORIZE THE LOCAL DAC SUPERVISOR TO MAKE THE NECESSARY CHANGES.

ATTACHED IS A COPY OF:

DOCTYPE NRC MONTHLY OPERATING REPORT DATE 05/01/91 MAKE TWO ADDITIONAL COPIES: 1 - T.T. MARTIN, 1 - NRMS om s em Fi<

1 3917084470

. = ,

Docket No. #50-352 Attachment to Monthly Operating Report for May 1991 LIMERICK GENERATING STATION 4 UNIT 1.

MAY 1 THROUGH MAY 31,1991

1. NARRATIVE

SUMMARY

OF OPERATING EXPERIENCES J Limerick Unit 1 began the month of May at a nominal 100% of rated thermal power, On May 5, there was a brief power reduction to approximately 90% to perform Main Turbine Combined Intermediate Valve (CIV) testing. On May 12, reactor power was reduced to 56%, due to partial failure of a cool.ng tower section and subsequent manual trip of two circulating water pumps. On the morning of May 13, reactor power was raised to 70%. On the afternoon of May 13, reactor power was reduced to 60% to facilitate cooling tower repairs Upon completion of repairs, Unit 1 reactor attained iOO% of rated thermal power on May 15. On Mai 17, there was a brief power reduction to 85% to perform a Control Rod pattern adjustment. On May 30 and 31, there were power  ;

reductions to approximately 90% due to high Main Turbine "back pressure". Unit 1 ended the month of May at 100% of rated thermal power. l Operational events that occurred during the month of May included:

- On May 8 during performance of Standby Gas Treatment System (STGS) and Reactor Enclosure Recirculation System (RERS) flow verification testing, Unit 1 Reactor Enclosure HVAC was secured. The '1C' Reactor Enclosure Supply Fan, however, failed to trip causing the Reactor Enclosure to pressurize. As a result, a olowout panel on the south wall of the Reactor Enclosure activated. Although STGS was in service for the test, differential pressure could not be maintained. Maintenance reinstalled the blowout Danel and secondary containment was restored. A four hour report requin . by 10CFR50.72(b)(2)(lil)(c) and (d) was made.

Later during the same surveillance test the 'A' RERS shut down and the manual secondary containment isolation signal cleared without any Control Room Operator action.

The Control Room Operators attempted to manually initiate a 'B' side secondary containment isolation, but were unsuccessful. Normal Reactor Enclosure HVAC was then placed in service and Technical Specification (r.S.) Action 3.0.3 was entered due to inoperable trains of STGS. Investigation revealed that the slide gate damper between the Unit 1 Reactor Enclosure and STGS had been closed under a " blocking permit" due to a personnel error. This damper bypasses the isolation signals when in the closed position. The slide gate damper was opened and the T.S. Action statement was exited.

A four hour notification to the NRC was made in act,ordance with 10CFR50.72(b)(2)(lii)(c) and (d),

11. CHALLLNGES TO MAIN STEAM SAFETY REllEF VALVES There were no challenges to the Main Steam Safety Relief Valves during the month of May.

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3917084470 Docket No. #50-353 Attachmont to Monthly Operating Report for May 1991 LIMERICK GENERATING STATION UNIT 2 MAY 1 THROUGH MAY 31,1991

1. NARRATIVE

SUMMARY

OF OEERATING EXPERIENCES Limorick Unit 2 began the month of May in OPCON 5* , Refuel mode, with core alterations permitted, in day 40 of its first refueling outage with core reload in progress. Core roiad was completed on Wednesday, May 1. The reactor vessel head studs were fully tensioned and OPCON 4, Cold Shutdown, was entored on May 8. The reactor vessel operational hydrostatic test was conducted on May 17 and 18. Unit 2 ended the month of May in OPCON 4, Cold Shutdown, with startup preparations in progress.

II..CB.A_Ll,ENGES TO MAIN STEAM SAFETY REllEF VALVES There were no challonges to the Main Steam Safety Relief Valves during the month of May.

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  • N N N (4 N N N e m -

UNIT SHUTDOWNS AND POWER REDUCTIONS DOCKET NO. 50 - 353 .

UNIT NAME LIMERICK UNIT 2 3as7no44#<0

/ tiVU

  • DATE JUNE 4.1991 .

REPORT MONTH MAv. 1991 COMPLETED BV PHILADELPHIA ELECTRIC COMRANV MARL MECH.

REPORTS SLPERVISOR BUSINESS UNIT LIMERICK. GENERATING STATION TELEPHONE (215) 327-1200 EXTENSION 3320 L i 1 METHOD OF i LICENSEE ISYSTEMLCOMPONENTl CAUSE AND CORRECTIVE iTVPE DURATION REASON! SHUTTING DOANI EVENT l CODE CODE i ACTION TO DATE i (1)l (HOURS)l (2) l REACTOR (3) l REPCRT s 1 (4) (5) f PREVENT RECURRENCE NO. ------- ..-.

I i 1 1 I I I N/A I ZZ ZZZZZZ THE UNIT REMAINED IN THE FIRST REFUELING is l 910501 1 S l 744.0 C 2 l l OUTAGE THE ENTIRE PERIOD.

l 1 l l -.... l l l l i l 744.0 i f l' (3) (4)

(1) (2)

REASON METHOD EXHIBIT G - INSTRUCTIONS F - FORCED FOR PREPARATION OF DATA A- EOUIPMENT FAILURE (EXPLAIN) 1 - MfNUAL S - SCHEDULED 2 - MANUAL SCRAM. ENTRV SHEETS FOR LICENSEE B - MAINTENANCE OR TEST EVENT REPORT (LER)

C - REFUELING 3 . AUTOMATIC SCR AM.

4 - OTHER ( E >.P L A I N ) FILE (NUREG-0161)

D - REGULATORY RESTRICTION E - OPERATOR TRAINING + LICENSE EAAMINATION (5)

F - ADu!NISTRATIVE G - OPERATIONAL ERROR (EXRLAIN) FAMIBIT I - SAVE SOURCE H - OTHER(EXPLAIN)

- _ _

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