ML20084S531

RO 50-265/75-47:on 751231,w/unit Operating at 805 Mwe, Reactor Core Isolation Cooling (RCIC) Trip Throttle Valve Could Not Be Reset Following Successful Monthly Surveillance Functional Testing.Hpci Tested & Found Operable

ML20084S531
Person / Time
Site:	Quad Cities
Issue date:	12/31/1975
From:	Kalivianakis N COMMONWEALTH EDISON CO.
To:	James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML20084S523	List: 05000265/LER-1975-047-01, /01T:on 751231,after Testing Isolation Cooling (RCIC) Trip Throttle Valve Could Not Be Reset.Caused by Design/Fabrication Error in Tappet of Turbine Overspeed Trip Mechanism.Work Request Issued ML20084S531
References
NUDOCS 8306170093
Download: ML20084S531 (1)

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Re gion III, Attention Mr.

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'Aabund Decc=her 31, 1975 J.

Keppler, Regional Directo r Office c.t Ins p e c t.io n and 3:a f o rc a n a n t Region III U.S.

iluc' car Ecaulatory Connionion 799 aoosevalt Road I

Glen Ellyn. IL 60137 l

Hoference:

- Q u a d-Ci tic a Uncicar Pouer Station. Unit 2 Docket So. 50-265 Drn-30 Appendiu A.

Section 3.5.E.1, 6.6.n.1.c

Dear Mr. Itcpple r:

I The p u rp or. e of thio letrer le to provide yoi trich no ti f.t ca t ion of a i

Ro p e r t.a.b le Oc currrra ce on rnquired by Technical Spe cifica tice 6.6.B.A uithin 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> of the o c c.ur ren ce.

On raconbar 31, 1975, uith Unit 2 operatinr, at SOS m E, the neactor Core Icolation Con 11an (RCIC) trip throttle velve could no t be renet foll.nting suc cons ful 3CIC nonthly curvo111saco f un c t$ or'nl tencing.

The High Presourc Coolant Injection (HPCI) Synton vac tenced in conpliance with Section 3.5.E.2 of the Te chnical Speci fic.a ciona nad van foun d operchie.

An cporntor van dinpatched to invoutinate the cause of the nnifunction.

IIo founr1 an in te rec ren ce in the trip and rucct linhage : echculan.

A work requent van innued to correct the p robic ::.

By 12200 a.n.

cn Dacenbor 31, 1975, the ECIC trip nechanian had been repaired and the RCI C cyn ton succcco fully tes te d.

This occurrence una discuened by telephone with Mr. Feierabend of your o.f fi ce on December 31, 1975.

Further information vill be provided by Reportablo-Decurronce Report RO 50-265 / 75-47 which will be o ub e:l t te:d wi thin M dayn of the dato of this occurrenco.

Vory truly youra, COMMO:!CF.ALTIP EDISCN 9,OMP/dlY, -QUI.D-CITIES HUCLF.AR POWER STATION

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Station S upe rin tun rien t NJK / tiCL/ ch oc: rOffice of Nuclev nuactor Regulation 9

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