ML20090D856

Preliminary AO-50-219/74-57:on 741108,stack Gas Sample Line Low Flow Alarm Received Due to Stack Gas Sample Pump Not Running.Cause Under Investigation.Pump Restarted

ML20090D856
Person / Time
Site:	Oyster Creek
Issue date:	11/11/1974
From:	Carroll J, Edelhauser J JERSEY CENTRAL POWER & LIGHT CO.
To:	James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
References
AO-50-219-74-57, NUDOCS 8303030302
Download: ML20090D856 (4)

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To: Janes P. O'Reilly .'c'.N '

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Directorate of Regulatory Operations f ,,

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King of Prussia, Pennsylvania 19406 From: Jersey Central Power 6 Light Company Cyster Creek Nuclear Generating Station Docket #50-219 Forked River, New Jersey 08731

Subject:

Abnormal Occurrence Report No. 50-219/74/57 .

'Ihe following is a preliminary report being submitted in compliance with the Technical Specifications, paragraph 6.6.2. -

Preliminary Approval:

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I b / < < : t :-, , M -10/11/74 J.T. Carroll,Jr/ Date cc: Mr. A. Gianbusso L

r l 8303030302 741111 gDRADOCK05000 .

11G73 00FY sm REGION _

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+-Ihitb1Telcphone Date of Report Pate: 11/S/~4 Occurrence: 11/S/74 Initial ;;ritten Time of .

Report Date: 11/11/74 Occurrence: 1220 OYSTER CREEK NUCLEAR GEN 2 RATING STATION FORKED RI\TR, NEW JERSEY 08731 Abnormal Occurrence Report No. 50-219/74/ 57 IDENTIFICATION Violation of the Technical Specifications, paragraph 3.6.A.3, OF OCCURRENCE:

failure of the stack gas sample system to continuously nonitor stack releases while the reactor was in an unisolated condition.

This event is censidered to be an abnornal occurrence as de-fined in the Technical Specifications, paragraph 1.1SB.

CONDITIONS PRIOR x Steady State Power Routine Shutdown.

TO OCCURRENCE: Hot Standby Operation Cold Shutdown Load Changes During Refueling Shutdown Routine Power Operation Routine Startup Other (Specify)

Operation The najor plant paraneters prior to this event were as follows:

Power: Core, 1912 MNt Elcetric, 655 MWa Flow: Recirc., 15.6 X 104 gpm Feed. , 7.22 X 10 6 lb/hr Stack Gas: 21,450 pCi/sec DESCRIPTION At approximately 1220 on November 8, 1974, a stack gas sampic 0F OCCURRENCE:

line low flow alarm was received in the control room. An operator was dispatched to check the stack gas sample pump.

At 1222, it was reported that the stack gas sample pump was l

not running. The stack gas sample pump was restarted at 1224 by placing the circuit breaker on instrument panci 4C in the 460V switchgear room to the ON position. The total amount of i

! tice the stack gas sample pump was out of service was approxi-nately four (4) minutes.

4 Abnormal Cecurrene- s

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APPAP.ENT CAUSE Design Procedure .

OF CCCURRENCE: thnufacture Unusual Service Condition Installation / Inc. Environmental Construction ~ Component Failure Operator x Other (Specify)

The cause of this occurrence is under investigation.

ANALYSIS OF A review of the stack gas radiation monitor recorder traces OCCURRENCE:

showed the Icvels of both monitor channels to be relatively constant (at 650 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 four minute period that the stack gas sample pump was not oper-ating, recorder traces of radiation monitoring systems associated with two gaseous streams released through the stack were re-viewed. A review of the off gas radiation monitor recorder traces showed that at approximately 30 minutes prior to this event, the IcVels of both monitor channels were relatively 3

constant (at approximately 1.4 X 10 mr/hr) with no spiking.

In addition, a review of the reactor building ventilation exhaust radiation monitor recorder traces showed that at the ,

time of this event, the levels of both monitor channels were 1

relatively constant (at approximately 2.0 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 mini-l mal.

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O V.?J. g r:a1 Occurrence O ,

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P.eport Na. 50-219/71/57 CORRECTIVE The stack gas sacple pump was restarted by placing the circuit ACTION:

breaker in the ON position. ll I

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l' FAILURE DATA:

Previous abnormal occurrences involving the stack gas sampic I:

Pump:

i 1. Abnormal Occurrence Report No. 74/53.

2. Ah,3rmal Occurrence Report No. 74/54.

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l Prepared by: ,,3,s . [M4 , c Lc.m Date: 11/8/74

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