ML20090D226

Preliminary AO-50-219/75-22:on 750810,stack Gas Sample Line Low Flow Alarm Received.Caused by Stack Gas Sample Pump a Not Running.Thermal Overload Protection Reset

ML20090D226
Person / Time
Site:	Oyster Creek
Issue date:	08/11/1975
From:	Carroll J, Denton R JERSEY CENTRAL POWER & LIGHT CO.
To:	James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
References
AO-50-219-75-22, NUDOCS 8302250155
Download: ML20090D226 (4)

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'!O: James P. O'Reilly Directorate of Regulatory Operations Region I 631 Park Avenue King of Prussia, Pennsylvania 19406 FROM: Jersey Central Power 6 Light Co::pany Oyster Creek Nuc1 car Generating Station Docket #50-2:

' Forked River, New Jersey 08731 e

SUBJECT:

Abnormal Occurrence Report No. 50-219/75/ 22 We following is a preliminary report being submitted in compliance with the Technical

. , Specifications, paragraph 6.6.2.

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Preliminary Approval:

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J. T. Carroll, Jr. Date CC: Mr. A. Giambusso .

8302250155 750811 .

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Jr.12.ial Telephone Date of -

Ecport Date: _ 8/11/75 Occurrence: 8/10/75 Initial Written - Time of 8/11/75 Occurrence: 1435 Report L' ate:

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. 01fSTER CREEK NUCLEAR GE ERATING STATION FORLED RIVER, NEW JERSEY. 08731 Abnorest occurrence .

R* Port No. 50-219/74/22 JDENTIFICATION Violation of the Technical Specifications, paragraph 3.4. A.J.

0F OCCUR E CE: f ailure_o f_the_.s t ac_k. gas sample system to costinuiiusly monitor stack re ses'while the reactor was in an unisolated condition. ,

1his event is considered to be'an abnormal occurrence as de-

,' . fined in the Technical Specifications, paragraph 1.15B . .

CatDITIO.VS PRIOR TO OCCURRENCE: X _ Steady State Power Routine Shutdown

!!ot Standby Operation Cold Shutdcwn Load Changes During RefuelinS Shutdown Routine Power Operation Routino Startup Other (Specify)

Operation Yower: Core, 167S NNt

- Electric, 550 M'.f o Flow:

Recirculation,13.5x10 4 SPm

, Feed, 6.55x100 lb/hr.

.1020'psiga . . ,

' Reactor Firessure :

' Stack-Cas:

10,200 pci/sec. . . .'

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02SCRITTIOV At 1435 on August 10, 1975 a stack gss ss=ple line low flow An operator was dis-CF CCCIMENCE: alarm was received in the Control Room. which time, Stack Gas Sample patched to check the Stack Gas Sa:ple Punp at Funp A was found not running. The operator resetThethe.thernal overload torni a;;ount of time which started Stack Gas Sanple Pu=p A at 1437.

the Stack Gas Sample Pump was out of service was approximately two (2) ninutes. .

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_ Mu i._ . _mi norsts1 Ocuarrence Page 2 /

por1L No.5D-219/75/ '

PpJtD7T CA:SE Design Procedure

? rrritact rr: Manufacture Unusual Service Condition h

. Installation / Inc. Environ =cntal Construction Co ponent Failure g Operator A ther O (Specify) m Tbc enuse of this occurrence is under investi- }a gation.

.ALYSIS OF A review of the stack gas radiation monitor recorder traces showed

• l ZURRDich the levels of both monitor channels to be relatively constant U 4

.t 400cysA) 2Socys B with no spiking before and af ter the pump trip. In a further L

• fort ts determine if excessive stack releases might have occurred during the

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.proxiute two(2) minute period that the Stack Gas Sample Pump was not [

eeratini, recorder traces of radiation monitoring systens associated with two )

.osous streams released through the stack were reviewed. Off Cas radiation  !

nitor recorder traces showed that the levels of both nonitor channels were i latively constant (at approximately 1.2Sx103 mr/hr) with no spiking for a j riod of approximately 60 minutes prior to th2s event. Sixty (60) minutes is  ;

e Off Gas System holdup time prior to relearing to the stack. In addition, i review of the Reactor Building Ventilation !!xhaust radiation monitor

corder traces showed that at the tino of this event, the levels of both j

sitor channels were relatively constant (at approximately 1.5 nr/hr) with '

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cpiking. Based on these considerations and the very short period of time

.ct the stack gas sample pump was not operating, the safety significance of '

13 event is considered to be minimal.

e iRRECTIVE The thornal overkoad protection was reset. After verifying that "

TIC'l: . Stack Gas Sample Pump A was running with no abnormal conditions

, esent, Stack Cas Sanple Pump B was put into service and Stack Gas Sanple apA was taken out of service.

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" .IWRE DATA: Previous abnormal ~o';currences

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1. Abnormal Occurrence Report involving No. 74/53.the Stack Gas S' ample Pumps.aq

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74/54 -

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74/57 '

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74/61

5. 75/6 spared by: V s% a. M Date: O!// W b d

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- 2- August 11, 1975

. . . Mr. Jaacs P. 0'Reilly l

3 E. COR32 f.CZr"1 4 The load was removed free the plant at 4:15 a.m., on August 11, 1975, and plant cooldovn was co ..enced at 11:10 a.u. , in preparation for replacer.ent of the faulty scal. .

F. TAILURE DATA I

M be addressed in the final report.

IRESTICATOR: 1 n -

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• 1 U W E. Denton ces Director of Office of Nuclear Reactor Regulation O .

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