05000312/LER-1986-001, :on 860121,diesel Generator G-886B Declared Inoperable Due to Fuel Inlet Pressure Above Limits Specified in Process Stds.Safety Functions Performed.New Spare Parts Ordered for Generator

:on 860121,diesel Generator G-886B Declared Inoperable Due to Fuel Inlet Pressure Above Limits Specified in Process Stds.Safety Functions Performed.New Spare Parts Ordered for Generator

ML20141M742
Person / Time
Site:	Rancho Seco
Issue date:	02/14/1986
From:	Colombo R, Reinaldo Rodriguez SACRAMENTO MUNICIPAL UTILITY DISTRICT
To:	Martin J NRC OFFICE OF ADMINISTRATION (ADM), NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V)
References
LER-86-001, LER-86-1, RJR-86-65, NUDOCS 8602280153
Download: ML20141M742 (3)

LER-1986-001, on 860121,diesel Generator G-886B Declared Inoperable Due to Fuel Inlet Pressure Above Limits Specified in Process Stds.Safety Functions Performed.New Spare Parts Ordered for Generator

Event date:
Report date:
Reporting criterion:	10 CFR 50.73(a)(2)(v), Loss of Safety Function
3121986001R00 - NRC Website

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EDG "A" AND "B" DECLARED IN0PERABLE DURING COLD SHUTDOWN EVENT DATE 15)

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During cold shutdown conditions, diesel generator G-886B exhibited a fuel inlet pressure slightly above the limits and precautions specified in the Process Standards and Operating Procedures during the monthly surveillance test. Although all the required technical specification acceptance criteria had been satisfied, the diesel generator was declared inoperable until the fuel inlet pressure condition was investigated.

Con-currently, diesel generator G-886A was considered to be out-of-service due to an air start system pressure control valve which had been rebuilt with parts which lacked complete quality assurance documentation.

The "A" generator had, however, successfully completed its monthly surveillance test.

Both diesel generators were functional, as evidenced by successful surveillance testing, except during the brief period when maint9nanm on the "A" generator was perior med to rectify the air start system pressure control valve concerns.

There was no effect on plant or public safety, particularly since the plant was in cold shutdown and there was no loss of offsite power.

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During cold shutdown conditions on January 21, 1986, diesel generator G-886B exhibited a fuel inlet pressure slightly above the limits and precautions specified in the Process Standards and Operating Procedures during the monthly surveillance test. Although all the required surveillance test procedures and technical specification acceptance criteria had been satisfied, the diesel generator was declared inoperable until the slightly elevated fuel inlet pressure condition was investigated. Concurrently, diesel generator G-886A, the remaining diesel generator at Rancho Seco, was considered to be out-of-service due to an air start system pressure control valve which had been rebuilt with parts which lacked complete quality assurance documentation.

It should be noted that diesel generator G-886A had successfully completed its monthly surveillance test.

Technical Specification 3.1.1.5 requires the decay heat system to be operable during cold shutdown conditions and the technical specification definition 1.3 of operable requires the system to have available its normal and emergency sources of power.

Although the diesel generators were not technically considered operable, they were avail-able and capable of performing their intended safety function. Therefore, it is a voluntary report since the reporting thresholds of 10 CFR 50.73(a)(2)(v), (vi) or (vii) were not reached.

To prevent a recurrence of this event, the District has taken the following corrective actions:

1.

New spare parts were ordered for diesel generator G-886B.

2.

The diesel generator manufacturer was contacted and a new higher fuel inlet pressure (80 psig) was determined to be an appropriate threshold value for corrective action.

The limits and precautions of the Operating Procedures and Process Standards have been appropriately revised.

3.

The air start system nonconforming part was removed by installation of a new pressure regulating valve for diesel generator G-886A.

4.

An audit of the control and documentation of spare parts in the warehouse has been initiated.

There was no effcct on plant or public safety as a result of this event since both offsite and onsite electric power were available for the decay removal system.

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'$SMUD SACRAMENTO MUNICIPAt. UTILITY OlSTRICT 6201 S Street. P 0 Box 15830. Sacramento CA 95852-1830.1916)452-3211 AN ELEC TRIC SYSTEM SERVING THl: HEAR T OF t'ALIFORNIA RJR 86-65 February 20, 1986 J B MARTIN REGIONAL ADMINISTRATOR REGION V 0FFICE OF INSPECTION AND ENFORCEMENT ATTN DOCUMENT CONTROL DESK U S NUCLEAR REGULATORY COMMISSION WASHINGTON DC 20555 DOCKET NO. 50-312 LICENSE NO. OPR-54 LICENSEE EVENT REPORT NUMBER 86-01 The Sacramento Municipal Utility District hereby submits volontary I.icensee Event Report Number 86-01.

If there are any questions concerning this report please contact Mr. Ron W.

Co16fnbo,at the Rancho Seco Nuclear Generating Station Unit No.1.

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PM R. J.

ODRIGUER ASSISTANTGENERAgMANAGER, NUCLEAR Attachment cc: Region V (2)

INPO 4

'fl RANCHO SECO NUCLEAR GENERATING STATION D 14440 Twin Cities Road, Herald, CA 95638 9799;(209) 333-2935