ML20084C638

Preliminary AO 50-219/74-48:on 740925,isolation Condensers a & B Isolated Due to False High Flow Indication on Condensate Line Break Sensors.Cause Under Investigaion.Surveillance Testing Performed on All Condensate Line Break Sensors

ML20084C638
Person / Time
Site:	Oyster Creek
Issue date:	09/26/1974
From:	Carroll J JERSEY CENTRAL POWER & LIGHT CO.
To:	James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
References
AO-50-219-74-48, NUDOCS 8304080133
Download: ML20084C638 (4)

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o ga pA To: James P. O'Rollly 3 Directorate of Regulatory Operations

• Region I 631 Park Avenuo .

'i-Eing of Prussia,. Pennsylvania 19406'

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Prom: Jersey Central Power 6 Light Company i 'i Oyster Crook Nucicar Generating Station ,

Docket #50-219 Forhed River, New Jersey 08731

Subject:

Abnorcal Occurrence Report No. 50-219/74/48 The following is a prcticinary report being submitted in cc=pliance with the Technical Specificatiens, Paragraph 6.6.2.

Prolininary Approval:

- b 8v/f/ 9/26/74 h T. Carroll, Jr. [./ Date cc: Hr. A. Gianbusso 9 s e

e 8304080133 740926 PDR ADOCK 05000219 S PDR RECEIVE lA FACSil.11LE ?d(/7f/ s 00 8'$

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Initial Teleph'ne o ."# Date of Report Date: 9/25^) <! Occurrence:

9/2S/74 v --

Initial Written . .i. Time of Rep'b'rt Dato: 9/26/74 Occurrence: 1010 0YSTER CREEK !RfCLEAR CDERATING STATION

- FORKED RIVER, !GN JERSEY 08731 Abnor=al Occurrence

. Report No. 50-219/74/48 ,

IDENTIFICATION Isolation of tho.A and B isolation condensers due to a false OF OCCURRE!!CE: .- -

, high flow indication on the condensato Iino break sensors.

This event is considered to be an abnormal occurrence as do-fined in the Technical Specifications, paragraph 1.15D.

CONDITIC::S PRIOR Steady.Stato Power .Routino Shutdown

'II) CCCURRE1:CE: Hot Standby Oporation Cold Shutdoun Load Channes During Refueling Shutdown Routine Power Operation Routino Startup x Other -(Specify)

-Operation _

Pont Scrm Stabili:ntica

Oporations

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' Conditions prior to the scram were:

Power: Reactor,19021:lt Electric, 665 !!io

. Plow: Recirc., 60.2 X los Ib/hr Feed., 7.11 X 106 lb/hr Reactor Pressure: 1020 psig Stack Gas: 1260 pCi/sec DESCRIPTION On Septenbor 25, 1974, a generator load rojection scran OF OCCURRElrE:

occurred which resulted in closure of the liSIV's approxicately 45 seconds later duo to low cain stoaa line pressuro. In order to renovo the reactor decay heat and control reactor pressure, an atterpt was cado to initiato the B isolation

. condenser. Approx 1r.ately ono half ninuto after initiation, ,

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the B isolation condensor rupture a'larm sounded and the condenser

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Abnormal Occurrence '

Report No. 50-219/74/48 ). . Pago 2 isolated. '1ho oporator on duty it=ediately pushed the iso-

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lation condenser isolation reset button and reinitiated the condensor which.again isolated after the appropriato tico interval. The operator then initiated the A isolation con-densor which also'(1solated appror.icatoly one half ninuto after initiation.xSinco the condensors woro operable for -

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half ninuto periods cpicco due to the action of an.' isolation bypass tica delay rolay which is started when tho isolction signal. occurs, .the operator was able to alternately-initic.to

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, 4 -'  ;-end rosat tho. esndenser isolaticnsi thereby pwviding n h=t

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APPAREiT CAUSS Dasign Proceduro OP OCCU:UECB: Hanufceture Unusual Servico Condition Installation /. Inc. Environnental Construction -

Co: ponent Fsiluro Operator -

Other (Specify)..>

Tho'.cause of this occurrence is under investigation. '

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ANALYSIS OF  !!ad a bonofied isolution condensor initiation condition oristed

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i both condensors would have isolated, thus clininating then as a WM. .

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heat sink for the ' reactor vossol. It should be noted that they could have been initiated Innually using the provicusly dis-y,, s cussed ~ techniques. .. 3;f,'g, '

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CORRECTIVE ~ ).: Surveillanco testingyas performed.on all isolation condensor ACTION:. ' . ,6 - ,- ' -

'::i.'W , condensato lino break sensors. '

"As found" setpoints.for tho

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, sonsors woro found to bo bolow..the Technica1' Specification limit

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'Rpport No. 50-219/74/43

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of 27 inches !!20. 'During this testing, the line break' sensors were adjusted to trip at 27/ inches H2 0;i .

c Additional items of correctivo action.will.bo deter =ined -

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.during the, review of.this.occurranco by.the Plant Operations --

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