ML20090D781

Preliminary AO-50-219/75-06:on 750310,stack Gas Sample Sys Failed to Monitor Stack Releases While Reactor in Unisolated Condition.Caused by faulty-circuit Design

ML20090D781
Person / Time
Site:	Oyster Creek
Issue date:	03/11/1975
From:	Carroll J JERSEY CENTRAL POWER & LIGHT CO.
To:	James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
References
AO-50-219-75-06, AO-50-219-75-6, NUDOCS 8303020367
Download: ML20090D781 (3)

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> To: Janes P. O'Reilly Directorate of Rcgulatory Operations Region I J

631 Park Avenue King oE Prussia, Pennsylvania 19406 1

From: Jersey' Central Powcr & Light Company Oyster Crack Nuclear Gancrating Station Docket #50-219 Forkcd River, Now Jersey 08731

Subject:

Abnormal Occtirrcnce Rcport No. 50-219/75/6 1

I . The following is a preliminary rcport being cohnitted in comp?.icnce ::ith thc Tcchnical 1

Specifications paragraph 6.6.2.

Preliminary Approval:

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fo /$/ ,4($$ 3/11/75 f J. T. Carroll, y'. Data i

i cc: Mr. A. Giartbusso i

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' 8303020367 750311 PDR ADOCK 05000219 S PDR 00FY St2frAGXRON

Initia.l Telephone Date of Rcport Dato: 3P')/ 7 5 f*qurrcnco : 3/10/75 ,

'%l U Initial Uritten Tima of Report Dato: 3/11/75 Occurrcnce: 1125 OYSTER CREEK NUCEEAR GENERATING STATIO:

FORKED RIVER, NEW JERSEY 08731 Abnormal Occurrenco Rcport No. 50-219/75/6 IDENTIFICATION Violation of the Technical Specifications, paragraph 3.6.A.3 i OF OCCUREEi:CE:

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

This evont is considorcd to be an abnormal occurrence as definec in the Technical Specifications, paragraph 1.15B.

1 CONDITIONS PRIOR X Steady State Power Routina Shutdcwn TO OCCURRENCE: Hot Standby Operation Cold Shutdown Load Changes During

, Refueling Shutdown Routino Power Opcration I

Routino Startup Other (Specifg) l Operation

Por

cr: C o r c , 1 9 ? ? !*'"

t Elcctric a 660 IDie Flo:n Recirculation,16.0 x 104 gpm Fced, 7.50 X 100 lb/hr Reactor Pressure: 1020 psig Stack Gas: _

34,225 uci/sec j DESCRIPTION At 1125 on Harch 10, 1975, an operator was dispatched to the l OF OCCURRENCE:

boiler house to changa over from the "B" stack gas sampic pump to the "A" pump. Since it had been reported that the "A" p. imp was losing oil, the intent was to opcrate this pcmp long cnough for maintenance personnel to troubicshoot.

Noting that the "A" pump was cxtrcmcly noisy upon starting, the operator advised the shift foreman of this condition. The shift forccena in turn, dispatched an assisting shift forc=an to evaluate the prob 1cm. The "A" stack gas sample pump subscquently tripped off while the assisting shift foreman

Abnormal'Occurrenco Pagc 2 Repqrt lio.. 50-219/75/6 was checking out the pump. The assisting shift foreman immediatcly attempted to rcstart the "B" pump; however, the pump failcd to start. He then resct the thermal overload (common to both stack gas sampic pumps) and switched back to the "A" pump. The "A" stack gas sample pump started at this time. t-lhile the "A" pump operatcl it was noted that flow was low, (about 1 cfm) and that vacuum was highcr than

. normal. Consequently, the assisting shift forcman reset the thctmal overinad (as an additional precaution) and started the "B" stack gas sampic pump. The total amount of timo during which ncither stack gas sampic pump was operating was icss than one (1) minutc.

APPARE!;T CAUED X Dcsign procedurc OF CCCURRE!:CE: Manufacturc Unusual Service Ccndition Installation / Inc. Environmonta?

Construction Component Failure Operator Other (Spccify)

The cause of the failure of the "D" stack gas sampic purrp to start following the trip of the A" pump 'is con ~idered to be circuit design. The cxisting circuit provides just onc thermal overload for both pumps. Consequently, a trip of one pump on thormal overload requires the manual rcsetting of the thermal overload beforc the other stack gas samplo pump can be started.

The cause of the trip of the "A" stack gas sample pump is currently under investigation.

A!lALYSIS OF A rcview of the stack gas radiation monitor rccordcr traces CCCURRCl;CE:

showed the levcis of both monitor channels to bc relatively e

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