ML20084S573

Preliminary Ao:On 751107,reactor Core Isolation Cooling (RCIC) Sys Turbine Tripped.Caused by Failure of Hydraulic Fluid servo-valve actuator.Servo-valve Actuator Will Be Replaced.Addl Info Will Be Submitted in AO 50-265/75-44

ML20084S573
Person / Time
Site:	Quad Cities
Issue date:	11/10/1975
From:	Kalivianakis N COMMONWEALTH EDISON CO.
To:	James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML20084S575	List: ML20084S573 ML20084S585
References
NJK-75-565, NUDOCS 8306170116
Download: ML20084S573 (1)

Text

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1. Co.gnwealth Edison Ouau Jes Generating Stat on

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Telecopy: Region ill, Attention: Mr. C. Feierabend flovember 10, 1975 -

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J. Keppler, Regional Director Office of inspection and Enforcement 5}

9,.gf o C Region ill \ h ', / gb., '

U. S. Nuclear Regulatory Commission  % J/

799 RooseveIt Road ' '2;h

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Glen Ellyn, 111inois 60137

Reference:

Quad-Citics fluclear Power Station, Uni t 2 Docket tio. 50-265, DPR-30 .

Appendix A, Sections 1.0.A.2, 3 5.E.1, 6.6.B.I.a

Dear Mr. Keppler:

The purpose of this letter is to provide you with notification of an Abnormal Occurrence as required by Technical Specification 6.6.B.I.a within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> of the occurrence.

On flovember 7, 1975, the Reactor Core Isolation Cooling (RCIC) system turbine tripped due to high exhaust pressure, during a Unit Two post maintenance outage surveillance test. This was in violation of Section 3.5.E.1 of Technical Specifications. The high backpressure was caused by the failure of the hjdraulic fluid servo valve actuator which controls the RCIC turbine inlet steam governing valve. Excessive steam entering the RCIC turbine created a high turbina back-pressure and the turbine tripped.

The High Pressure Coolant injection (HPCI) system was tested and found operabic.

The servo-valve actuator will b2 replaced.

This occurrence was discussed by telephone with !ir. Knap of your office on flovember 8, 1975 Further inforrution will be provided by Abnormal Occurrence Report A0 5_0-265/75-W.bich will be submi t ted wi thin 10 days of the date of this occurrence.

Very truly yours ,

C0 lim 0!!VEALTH EDIS0!! COMPANY QUAD-C!TIESliUCLp/R ,

PO'JER,,STATI ON

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tl.J. Kalivicnakis I

Station Superintendent 8306170116 751110

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