ML20090D829

AO-50-219/75-03:on 750211,during Surveillance Test, Containment Spray Pump 51A Failed to Start When Subjected to Signals.Cause Under Investigation.Procedure Developed to Check All Wiring & Components Re Pump Starting Circuit

ML20090D829
Person / Time
Site:	Oyster Creek
Issue date:	02/19/1975
From:	Ross D JERSEY CENTRAL POWER & LIGHT CO.
To:	Giambusso A Office of Nuclear Reactor Regulation
References
AO-50-219-75-03, AO-50-219-75-3, NUDOCS 8303020439
Download: ML20090D829 (3)

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. jersey Central Power & Light Company Q(, ,

MADISON AVENUE AT PUNCH BOWL ROAD e MORRtSTOWN,N.J. 07960

• 201-539-6111

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February 19, 1975 O,!3

• Mr. A. Giambusso FEB2 51975 > D1 '

Director, Division of Reactor Licensing u. ATZC CIT Office of Nuclear Reactor Regulation og Efi$.y/ p United States Nuclear Regulatory Commission Ed una Washington, D. C. 20545 ci, g

Subject:

Oyster Creek Station Docket No. 50-219 A'uavi.:.u1 Guvuiicave Repoit Nv. 5.0-21D/~5 ~

The purpose of this letter is to forward to you the attached Abnormal Occurrence Report in compliance with paragraph 6.6.2.a of the Technical Specifications.

Enclosed are forty copies of this submittal.

Very truly yours, 6:i  ?-dd' ---,

Donald A. Ross (

Manager, Generating Stations-Nuclear es Enclosures cc: Mr. J. P. O'Reilly, Director Office of Inspection and Enforcement, Region 1 2167 8303020439 750219 PDR ADOCK 05000219 S PDR l

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jersey Central Power & Light Company %( 2/

MADISON AVENUE AT PUNCH BOWL ROAD

• MORRISTOWN, N.J. 07960

• S01 539-6111

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General e}e{ Public Utilities Corporation SF5Fg ar OYSTER CREEK NUCLEAR GENERATING STATION FORKED RIVER, NEW JERSEY 08731 Abnormal Occurrence Report No. 50-219/75-3 Report Date ,

February 19, 1975 Occurrence Date February 11, 1975 Identification of Occurrence Failure of containment spray pump 51A to start when called upon to do so. This event is considered to be an abnormal occurrence as defined in the Technical Specifications, paragraph 1.15D.

Conditions Prior to Occurrence The plant was in a routine startup with major parameters as follows:

Power: Reactor, 1280 MWt Electric, 435 MWe Flow: Recirculation, 8.1 x 10 gpm Feedwater, 4.64 x 106 lb/hr Stack Gas: 13,500 pCi/sec Description of Occurrence On Tuesday, February 11, 1975, at 0335, during the monthly surveillance test of the containment spray system, containment spray pump 51A failed to start in the automatic mode when subjected to simulated low-low reactor water 1cvel and high drywell pressure signals. It was observed that the " pump failure" alarm initiated approximately 57 seconds after the start signal was applied.

In an attempt to determine the cause of the failure, the surveillance test was again conducted and the pump was observed to start in the proper manner.

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y G 'w Abnormal Occurrence Report No. 50-219/75-3 Page 2 Apparent Cause of Occurrence i

The cause of the occurrence is presently under investigation.

Analysis of Occurrence The only significance associated with the failure of 51A to start is in a loss of system redundancy. Ilad conditions arisen requiring containment spray, pump 51C would have started automatically and performed the containment heat removal function. In addition, the manually initiated backup pumps, 51B for System 1 and SID for System 2, were operable and could have been initiated. The containment heat removal function can be adequately supplied by a single contain-ment spray pump.

Corrective Action -

It should be noted that the failure monitor installed as the result of a similar occurrence on October 21, 1974,was not connected during this event. In additional efforts to determine the cause of the failure, the start sequence of the 51A pump was repeated four times with the failure monitor in service. In each of these operations, the pump started in the proper manner. A procedure will be developed to systematically check all wiring and components associated with the starting circuit of the pump in addition to ensuring that the failure monitor is continuously connected to the circuit.

Failure Data Previous abnormal occurrences involving the containment spray system:

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

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

3. Abnormal Occurrence Report No. 50-219/72-12 l

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