ML19211A947

RO 79-38/03L:on 791105,during Degraded Mode Operation & Surveillance Test,Diesel Generator Failed to Start.Caused by Diesel Generator Breaker Position Switch Being Out of Adjustment.Switch Readjusted

ML19211A947
Person / Time
Site:	Oyster Creek
Issue date:	12/14/1979
From:	JERSEY CENTRAL POWER & LIGHT CO.
To:
Shared Package
ML19211A932	List: ML19211A931 ML19211A947
References
NUDOCS 7912210354
Download: ML19211A947 (2)

Text

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-:./**r g: r:s:ce.. New Jersey ~Js50 (20*)455-E2DO OYSTER CREEK NUCLEAR GENEPATING STATION Forked River, New Jersey 08731 Licensee Event Report Reportable Occurrence No. 50-219/79-38/3L-0 Recort Date December 14, 1979 (Revised Attachment)

D currence Date November 5, 1979 Identification of Occurrence Operating in a degraded mode as permitted by Technical Specifications, paragraph 3.7.C.2, when Diesel Generator il failed to start during a surveillance test.

This event is considered to be a reportable occurrence as defined in the Technical Specifications, paragraph 6.9.2.b.(2).

Conditions Prior to Occurrence The plant was operating at steady state power.

The major parameters at the time of the occurrence were:

Power: Reactor, 1853 MWt Generator, 640 MWe 4 Flow: Recirculation, 14.8 x 10 gpm 6 lb/hr Feedwater, 7.01 x 10 4 Stack Gas:

3.19 x 10 pCi/sec Description of Occurrence On Monday, November 5, 1979, at approximately 4: 00 a.m., while performing the Diesel Generator 20% Plus Load Test, diesel generator breaker position switch 52HH did not close when the breaker was racked in.

This prevented Diesel Generator il from starting.

Upon irmnediate investigation, it was found that position switch 52HH was out of adjustment.

Diesel Generator _f2 was run for one hour to satisfy Technical Specification requirements before Diesel Generator #1 was serviced.

A job order was initiated to readjust the switch.The switch was readjusted and checked several times.

Diesel Generator

1. 1 was returned to service af ter satisf actory completion of the 20% Plus Load Test.P00R ORGlm 636 29o z e122, e 33,. . . . .~ e -.-- s _ -

ft:c-ta:le Occurrence Nc. 30 ~iE/75-3E/3L-C

, EiSt 2 Dece .be r 14, 197c (Revisec Attachment)

, Accaren: Cause of Oicurrence The cause of this occurrence is attributed to componen- failure.

Pesitten switch for breaker was cu o:. acJustment.

...r.nalysis of Occurrence

, The diesel cenera crs are receirec c supply a standby scurce of powcr to cperate ecuIpment receired for a safe plant shutdow ;and ic maintain the plant in a safe shu:cown cendi icn.

Eacn diesel is capable of operating the re-cuirec engineerec safe y ecuipmer.: followine an accicent.

Diesci Genera cr #2 was verified cperable; therefore, -he safety s ignificance was censidered inimal oecause -here was an adecus e amcunt cf standby power anc no other safety ecuipmen was cu: cf service.

Correc:ive Action The diesel genera cr breaker pesi:lon swi:ch check will be added to the Ll60 volt breaker preventive maintenance procecure prior :c the next year's refueling outage.

The breaker position switch on Diesel Generator #2 was tested and found satisfactory.

Failure Data Circuit Breaker Manufacturer:

General Electric Company Type: AM-4.16-250-7H l1 Switch: 52HH.300RORBM.~

.636L 291