ML20090D862

AO-50-219/74-55:on 741018,during Surveillance Test, Containment Spray Pump 51A Failed to Start in Automatic Mode When Subjected to Signals.Cause Under Investigation.Addl Monitoring Installed to Determine Cause

ML20090D862
Person / Time
Site:	Oyster Creek
Issue date:	10/28/1974
From:	Ross D JERSEY CENTRAL POWER & LIGHT CO.
To:	Giambusso A US ATOMIC ENERGY COMMISSION (AEC)
References
AO-50-219-74-55, NUDOCS 8303030653
Download: ML20090D862 (3)

Text

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.ersey Centra Power & Lig7t Company %( , (

MADISON AVENUE AT PUNCH BOWL ROAD

• MORRISTOWN,N.J.07960

• 201-539-6111 rmw rus General 'o['.)[*, Public Utilities Corporation srstan g

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October 28, 1974

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g Il0V1 Mt'ygd Mr. A. Giambusso M u. H"Ci; *'

cuni:1 ,l goat Deputy Director for Reactor Projects *# -

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United States Atomic Energy Commission flaslaington, D. C. 20545

Subject:

Oyster Creek Station Docket No. 50-219 Abnormal Occurrence Report No. 50-219/74-5!,

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 copics of this submittal.

Very truly yours, f G 4 ,f_._ _ --- ,

. Donald A. Ross Manager, Nuclear Generating Stations es Enclosures

, cc: Mr. J. P. O'Reilly, Director Directorate of Regulatory Operations, Region 1

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. ersey Central Power & Lig7t Company y

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

• 201-539-6111 e u.a a or rur o ...h General g.,. ,, Public utilities corporatior.

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0YSTER CREEK NUCLEAR GENERATING STATION FORKED RIVER, NEW JERSEY 08731 Abnormal Occurrence Report No. 50-219/74-55 Report Date October 28, 1974 Occurrence Date October 18, 1974 Identification of Occurrence Failure of containment spray pump 51A to start when signaled 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 at steady state power with the following major parameters:

Power: Reactor,1904 FMt Electric, 642 MNe Flow: Recirculation, 16.0 x 104 gpm Feedwater, 6.99 x 10 6 lb/hr Stack Gas: 14,100 pCi/sec Description of Occurrence It was observed on Friday, October 18, 1974, at 1515, during the monthly surveil-lance test of the containment spray system that containment spray pump 51A for containment spray System 1 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

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' Abnormal Occurrence Report No. 50-219/74-55 Page2 after the start signal was applied. In an. attempt to determine the cause of the pump malfunction, the surveillance was again performed while monitoring the action of the 45 second time delay relay, TK1, and the contacts of relay 16K2A in the start circuit for the pump . It was observed that the 51A pump successfully started at this time and all aspects of its operation were found to be normal.

Apparent Cause of Occurrence 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 i of system redundancy. IIad conditions arisen requiring containment spray,

pump 51C for System 2 would have started automatically and performed the contain-i ment heat removal function. In addition, the manually initiated backup pumps 51B for System 1 and 51D for System 2 were operable and could have been initiated.

The containment heat removal function can be adequately supplied by a single l

containment spray pump.

Corrective Action i

Since the failure of the pump to start did not repeat on the second surveillance test, the cause for the initial failure is indeterminable. Additional monitoring will be installed in an effort to determine the cause of the failure of the p a:p staic circuit should the failure again occur.

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