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Monthly Operating Repts for Dec 1990 for Limerick Generating Station Units 1 & 2
	ML20066E406
Person / Time
Site:	Limerick
Issue date:	12/31/1990
From:	Leitch G, Meck K; PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC
To:	; NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
	NUDOCS 9101220004
	Download: ML20066E406 (11)
	v • d • e

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.5917/ 00 d a /0?

T.S.6.9.1.6; l

PHILADELPHIA ELECT.RIC COMPANY t

' LIMERf CK GENER ATING ST ATION P, C, 00X A S AN ATOG A, PENNSYLV ANI A 19464 (216) 32 71200, EXT, 3000 eaajg,7;;,*,81es January 9, 1991l u.......................

Docket Nos. 50-352 50-353 Licensa Nos. NPF-39 s NPF-05.

t U. S.

Nuclear Regulatory Commission Attnt-Document = Control Desk Washington, DC 20555

Subject:

Limerick Generating Station Monthly. Operating Report For Units 1 and 2 Enclosed are the monthly operating reports for Limerick -Units 1 and 2 for the month of December, ~1990 forwarded =- pursuant to.

Technical Specification 6.9.1.6.

Very truly

urs, KWM/dms i

Enclosure cc:

T. T. Mr.irtin, Administrator, Region I,.USNRC T. J. L nny, USNRC Senior Resident Inspector

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9101220004 9012:31

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Docket No. #50 352 Attachment to Monthly Operating Report for i

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December 1990 --

1 UMERICK G5NERATING CTA oQti UNIT 1 DECEMBEN 1 THROUGH DECEMBEK 31,1990

1. fM8fSTIVE SU-MMARY_OF OPERATING EXPENdNCES -

Umerick UnR t began the month of DecemberM Cold Shutdown. Unit :1 startup commenced on December 6 at 0500 hours0.00579 days 0.139 hours 8.267196e-4 weeks 1.9025e-4 months , and reactor criticalky was achieved at 0652 hours0.00755 days 0.181 hours 0.00108 weeks 2.48086e-4 months . During the startup, the '18' Residual Heat Removal Service Water (RHRSW) heat exchanger outlet valve was found to be inoperable. On December 9, at 1744 aours Unit 1 Reactor was shutdown from a nominal 7%.-

of rated thermal power to comply with the Technical Specifications. On December 14, following.

repairs to the RHRSW valve, Unk 1 entered startup and power ascension. Following startup testing, the main turbine generator was synchronized to the grid on December 17 at 0026 hours3.009259e-4 days 0.00722 hours 4.298942e-5 weeks 9.893e-6 months . Several -

i hours later the turbine was tripped due to a main generator stator water cooling leak. The reactor -

remained critical with main steam bypassed to the condenser The leak was repaired and the turbine placed back in service for trip testing. Following turbine trip testing, the turbine-generator _was re-synchronized with the grid later that day lUmerick Unit 1 ended the month of December at a nominal 100% of rated thermal power except for a load drop to 85% for a Control Rod Pattom Adjustment and Main Turbine Control Valve. testing on December 28.

Operational events that occurred during the month'of Decener !ncluded:

On December 2 with startup prepnrations in progress, a Reactor Protection System (RPS)

- actuation. occurred due to an unexpected Main Turbine low condenser vacuum trip i

concurrent with performance of the Main Turbine Stop Valve RPS Surveillance Test. The vacuum trip occurred during vacuum pull when vacuum reached the trip / reset point. The l

trip is automatically armed at the reset point. Due to the sensitMty of the sensors, the logic generated reset and trip signals, resulting in a turbine trip. A 4 hour4.62963e-5 days 0.00111 hours 6.613757e-6 weeks 1.522e-6 months exxification was made j

for an ESF actuation.

i II. ' CHALLENGES TO THE MAIN STEAM SAFETY REUEF VALVES There were no challengos to the Main Steam Safety Relief Valves during the month of December, l'

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3917008370 l

Docket No. #50 353 Attachment to Monthly Operating Report for j

December 1990 UMERICK GENERATING STATION UNIT 2 DECEMBER 1 THROUGH DECEMBER 31,1990

1. NARRATIVE

SUMMARY

OF OPERATING EXPERIENCES Umerick Unit 2 began the month of December at a nominal 100% of rated thermal pcwor. On g

December 1. reactor power was reduced to 87% to repair an electro-hydraulic control (EHC) fluid i

leak on the #4 Main Turbine Contrd Vatve. On December 7, reactor power was reduced to 86% to perform a control rod pattern adjustment. On December 14, reactor, power was reduced to 86% to support repairs of an EHC flu 6d leak on the #4 Main Turbine Control valve. On December 15, power was reduced an additional 5% to 80% to reduce EHC piping vibration. After discovering that the EHC leak repair was not holding, on December 19, Unit 2 reactor power was reduced to a nominal 3J 15% of rated thermal power and the main turbine was taken off line. This allowed a small section of EHC piping to be replaced. The main turbine generator was syncttonized to the grid at 2010 i

hours on December 21. On December 23, Unit 2 reactor power was restored to 100% of rated thermal and then reduced briefly to 87% to perform a control rod pattom adjustment. On December 30, reactor power was briefly reduced to 90% to perform a Main Turbine Control valve exercise test.

l

)

11. CHALLENGES TO MAIN STEAM SAFETY REUEF VALVES There were no challenges to the Main Steam Safety Relief Valves during the month of December, l

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Subject:

SUMMARY

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