ML20090D824

Preliminary AO-50-219/75-05:on 750306,containment Spray Pump 51A Failed to Start When Subjected to Simulated Signals.Caused by Breaker Trip Bar Failing to Reset After Previous Breaker Trip.Trip Bar Bushings Cleaned

ML20090D824
Person / Time
Site:	Oyster Creek
Issue date:	03/06/1975
From:	Carroll J JERSEY CENTRAL POWER & LIGHT CO.
To:	James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
References
AO-50-219-75-05, AO-50-219-75-5, NUDOCS 8303020427
Download: ML20090D824 (3)

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To: James P. O'Reilly  ; '.

s f, Directorate of Regulatory Operations g , if Region I l ZI ' '

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King of Prussia, Pennsylvania 19406 - , f . ' ' '

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.i,4 n; g From: Jersey Central Power 6 Light Company Oyster Creek Nuclear Generating Station Docket #50-219 Forked River, New Jersey 08731 Subject Abnormal Occurrence Report No. 50-219/75/5 incfo1Jowing$sapreliminaryreportbeingsubmitted in compliance with the Technical Specifications, paragraph 6.6.2.

Preliminary Approval:

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Q/w Mn.+h .s// 7.f J'. T. Carroll, Jr. / Date

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cc: Mr. A. Giambusso 2[3d 8303020427 750306 PDR ADOCK 05000219 8

PDR

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Init ial* Telephone O Da(Q'/

tc of Report luto: -

3/6/75 Occurrence: 3/6/75 Initial Written Time of Report Date: 3/6/75 Occurrence: 0950 OYSTER CREEK NUCLEAR GENERATING STATION FORKED RIVER, FEW JERSEY 08731 Abnormal Occurrence Report No. 50-219/75/5 -

IDENTIFICATION Failure of containment spray pump 51A to start when called 0F OCCURRENCE:

upon to do so.

This event is considered to be an abnormal occurrence as defined in the Technical Specifications, paragraph 1.15D.

CONDITIONS PRIOR X Steady State Power Routine Shutdown TO OCCURRENCE: Hot Standby Operation Cold Shutdown Load Changes During Refueling Shutdown Routine Power Operation Routine Startun Other (Specify)

Operation Poucr: n: etar,1 ^; :".?L Electric, 665 Mh'c Flou: 4 8PM Recirculation, 615.8 X 10 Feed, 7.67 X 10 lb/hr Stack Gas: 29,600,uci/sec DESCRIPTION OF It was observed on Thursday, March 6,1975, at 0950, during OCCURRENCE:

the monthly surveillance test of the containment spray system that containment spray pump 51A failed to start in the automatic mode when subjected to simulated low-low reactor water Icyc1 and high drywell pressure signals. It was observed that the " pump failure" alarm initiated approximately 64 seconds after the start signal was applied. An operability check was performed on the redundant System 1 Containment Spray Pump 518.

Containment Spray Pump 51A was then removed from scr. ice for-investigative analysis as to the cause of the failure.

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i Abnomal Occurrence Report N,o. 50-219/75/5 O O Pace 2

! APPAIENT CAUSE Design Procedure 4

0F OCCURRENCE: !fanufacture Unusual Service Condition Installation / Inc. Environmental

Construction. Component Failure Operator other (Specify)

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The cause of the occurrence is presently under investigation.

l ANALYSIS OF The only significance associated with the failure of 51A to OCCURRENCE:

start is in a 2oss of system redundancy. Ilad conditions 4 arisen requiring containment spray, pump 51C would have started i nutomatically and performed the containment heat removal function. 1 4

In addition, the manually initiated backup pump .51B.for .

System I was checked to be operabic and could have been initiated.  ;

The containment heat removal function can be adequately supplied hv a sinolo conteinnont spray pump.

i CORRECTIVE The failure monitor installed as the result of a similar ACTION:

occurrence on October 21, 1974 functioned during this event nnd '

the information obtained is under analysis in an effort to i g

determine the cause.

FAILURE liATA: Previous abnormal occurrences involving the containment spray system:

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1. Abnormal Occurrence Report No. 50-219/75/3

2. Abnormal Occurrence Report No. 50-219/74/55

3. Abnormal Occurrence Report No. 50-219/73/12

4. Abnormal Occurrence Report No. 50-219/72/12 i

j Prepared by:

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