ML20090D863

AO-50-219/74-54:on 741018,stack Gas Sample Pump Stopped Running.Cause Unknown.Sample Pump Restarted

ML20090D863
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-50-219-74-54, NUDOCS 8303030696
Download: ML20090D863 (3)

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.ersey Centra Power & Lig7t Company MADISON AVENUE AT PUNCH BOWL ROAD

• MORRISTOWN, N.J. 07960

• 201-539-6111 NEmanR OF THE General [,"*j]*, Public Utilities Corporation

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October 28, 1974 '

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Mr. A. Giambusso y -

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Deputy Director for Reactor Projects ~'

Director of Licensing ~~

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

Subject:

Oyster Crook Station Docket No. 50-219 Abnormal Occurrenca Report No. 50-219/74-54 The purpose of this letter is to forward to you the attached h 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,  ;

g / C t* / WV Donald A. Ross  !

Manager, Nuc1 car Generating Stations cs

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i cc: Mr. J. P. O'Reilly, Director k

Directorate of Regulatory Operations, Region 1 5 I(

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O O Jersey Central Power & Light Company ,

MADISON AVENUE AT PUNCH BOWL ROAD

• MORRISTOWN, N.J. 07960

• 201-539-6111 k Ni met R D9 TNG General ,

"[, Public Utilities Corporation SYSTE M OYSTER CREEK NUCLEAR GENERATING STATION FORKED RIVER, NEW JERSEY 08731 1

Abnormal Occurrence Report No. 50-219/74/54 Report Dato October 28, 1974 Occurrence Date October 18, 1974 Identification of Occurrence Violation of the Technical Specifications, paragraph 3.6. A.3, failure of the_

stack gas sample system to continuously monitor stack releases while the reactor 2

was in an unisolated condition. This event is considered to be an abnormal 1

occurrence as defined in the Technical Specifications, paragraph 1.158.

A Conditions Prior to Occurrence The plant was at steady state power with major parameters as follows:

Power: Core, 1904 Wit Electric, 642 MWe Flow: Recirculation, 16.0 x 104 gpm Feedwater, 6.99 x 10 6 lb/hr Stack Gas: 14,100 pCi/sec Description of Occurrence i

At approximately 1510 on October 18, 1974, an equipment operator observed that the stack gas sample pump seemed to be making excessive noise. IIc then telephoned the control room to report his observation. During this telephone conversation, the equipment operator noticed that the stack gas sample pump stopped running.

A stack gas sample low flow alarm was roccived in the control room coincident I

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Abnormal Occurrence Report No. 50-219/74-54 Page 2 with the tripping of the sample pump. The. pump was restarted by placing the thermal overload reset switch in the ON position. The total amount of time that the stack gas sample pump was not running is estimated to be apprcximately one minute.

Apparent Cause of Occurrence The cause of this occurrence is unknown.

Analysis of Occurrence A review of the stack gas radiation monitor recorder traces showed the levels of both monitor channels to be relatively constant (at 500 and 400 cps) with no spiking before and after the pump trip. In a further effort to determine if excessive stack releases might have occurred during the approximate one minute period that the stack gas sample pump was not operating, recorder traces of radiation monitoring systems associated with two gaseous streams released through the stack were reviewed. A review of the off gas radiation monitor recorder traces showed that prior to this event, the levels of both monitor channels werc_relatively constant (at approximately 1.2 x 103 mr/hr) with no spiking. In addition, a review of the reactor building ventilation exhaust radiation stonitor recorder traces showed that at the time of this event, the levels of both monitor channels were relatively constant (at approximately 1.4 mr/hr) with no spiking. '

Based on these considerations and the very short period of time that the stack gas sample pump was not operating, the safety significance of this event is considered to be minimal.

Corrective Action l

) The stack gas sample pump was restarted by placing the thermal overload reset switch in the ON position. Following restart, the pump motor amperage was checked and found to be normal and the noise Icycis were not found to be above average for this pump. No abnormalties were identified at this time.

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