ML20090D273

Preliminary AO 50-219/75-17:on 750619,during Surveillance Test,Core Spray Sys Parallel Isolation Valve V-20-15 Failed to Demonstrate Operability.Caused by Broken Tab on B Phase of Valve Motor Breaker Stab.Stab Replaced

ML20090D273
Person / Time
Site:	Oyster Creek
Issue date:	06/19/1975
From:	Carroll J JERSEY CENTRAL POWER & LIGHT CO.
To:	James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
References
AO-50-219-75-17, NUDOCS 8302250466
Download: ML20090D273 (4)

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TO: Jrnes P. O'Reilly Directorato of Regulatory Operations Region I 631 Park Avenuo King of Prussia, Pennsylvania 19406 FRO *t: Jersey Contral Pcwer C Light Co:;cny Oyster Creek Nuc1' car Generating Statien Docket f50-2; Forked River, New Jor::cy 00731

SUBJECT:

Abnornal Occurrence Ecport No. 50-219/75/ 37 The following is a pxtlininary report being

' subuitted in cc:::plience with the Technical Specifications, paragraph 6.6.2.

Prolininary Approval:

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8302230466 750619 PDR ADOCK 05000 S  ;

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- Initial Telephone Date of Roport Date: 6/19/75 . Occurrence: 6/19/75 Initial ifritton Time of Report Dates G/19/75 Occurrences 1100 OYSTER CREEK HUCLEAR CENERATING STATION FORKED RIVER, !!EW JERSEY 0 8 7 3.1 e Abnornal Occurrence -

neport No. 50-219/75/17 IDENTIFICATIOu Failuro of Core Spray Systen Parallel Inolution n OF OCCURRENCEn Valvo (V-20-15) to Gemonstrate operability durin-l survoillance testing.

Thia ovent is conaldered to be an abnormal occur:

as defined in the Technical Specifications, paragraph 1.15D.

CONDITIONS PRIOR X Steady Stato Power Routino shutdown TO OCCURRENCE: Hot Standby Operation Cold Shetdown Load Changen.Durit nefueling Shutdown Routino Power Oino:

noutino startup other (Specify)

Operation __

The najor plant paranotora at the, tino of the uva

' were na follows:

Powers Coga, 1600 NWt Elect, 530 Mue

- Flows Rociro, 13.0 x 10 4 <ip a Feed,5.91 X 10 0 lb/hr Stuck Gas: 9,G00 uc/ cec DESCRIPTION OF On Thuroday, June 19, 1975 at approxinately 1100 OCCURRENCE during the perfornence of surveillance testing on tho four (4) Low Reactor Prennuro Coro Spray Vali Permissive Pressuro Switchen (RU 17A, D, C, and1 Corn Cpray Sycten Parallel Isolation Valva (V '

failed to demonstrato oporability. The tocting i e

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hmormJ0 Occurronce ,

eport No. 50-219/75/17 Page 2 each low pressure switch may be sunnarized as fo2. lows (1) The sonnor is isolated from the reactor, pressuro is blod off and the opening of the -

asecciated parallel isolation valves is noted.

(27 Using a test pump , s pressure in excess of 205 poly is impresue6 on the sensor and tho. clocing of the associated , parallel isolation valves is noted.

(3) 1*ressure is blo6 off f rom the sensor and the opening of the associated parallel xsolation valvos is noted.

valve (V-20-15) failed to close coupletely when Stop (2) was being perforned on pressure switch

, (RE 17B). It in noted that V-20-15'had previously

, functioned norually during the testing of pronouro switch (RE 17A).

FarsiT cir5E Design Procedure CCCu11RunCE Itanufacture Unusual Cervico Condition Installation / Inc. Environcontal Construction  % Couponent Failuro Operator Other (Specify)

Investigation revealed that the tab on the "U" phaso of the valve stotoc breaker stab was brohor, renulting in internJtrent contact with the nanociated bus bar. Concoquently, the lons of one phano caused the valvo asoror to trip.

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Snotws1 Occurrence esport No. 50-219/75/17 Page 3 ttaL2cLE ibT Each core spray cyctem in provided with two (2)

CCURImtitre pars 21o1 isolation vaJ vos which open when a 2cu-lot coactor stater level or tfgh drywell precture condition exists in addition to a loir reactor preecure condition ( < 285 psig) . The sufaty sigtsificance of this evont is considorod to be the loss of parallel isolation valve redundancy in one cosa spray systen.

IRR2CFE*J ACTIOMs n: mediate corrective e.ction involved replacing tho T-20-15 notor brecker etab and inopecting the notor breakers for the other parallel isolation valvoo, t

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