ML20084J959

AO 1-72-5:on 720411,RCIC Sys Failed to Deliver 400 Gpm in Less than 30-S.Caused by Electrical to Hydraulic Transducer Not Functioning.Defective Egr Unit Replaced

ML20084J959
Person / Time
Site:	Quad Cities
Issue date:	04/19/1972
From:	Palmer F COMMONWEALTH EDISON CO.
To:	Morris P US ATOMIC ENERGY COMMISSION (AEC)
Shared Package
ML20084J962	List: ML20084J959 ML20084J979
References
AO-1-72-5, FAP-72-86, NUDOCS 8305190101
Download: ML20084J959 (2)

Text

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Commonwealth Edison Company Q U A D.CITIE S N U C L E A R POWER STAttOH Address Reply to:

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Dr. Peter.A. Morris, Director

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y' Division of Reactor Licensing U. S. Atomic Energy Commission k.Q!'h. s.M Washington, D. C. 20545

Reference:

License DPR Quad-Cities nuclear Power Station Unit 1 - Section 6.6.A.3 6.6.B.3

Dear Mr. Morris:

This is to report a condition relating to test

- operation of the Reactor Core Isolation Cooling System on Quad-Cities Muclear Power Station Unit 1.during start up testinr. The Recctor Core Isolntion Coolinr Sy'-tem failed to perform its intended function at a reactor pressure of 950 psic. This incident 1-72-5 is reported as an abnormal occurrence.

Incident Descrintion 'and Immediate Action - At 4:30 p.m.

on April ll, 19 7 2, St artup Tes t lio, 14 on the Reactor Core Isolation Coolinr System was being performed at rated reactor pressure. The "RCIC" sys' tem failed to deliver

. 400 gnn in less than or ecual to 30 seconds. The system was declared inonerable and the HiFh Pressure Coolant Inj e ction System was satinf actorily teste d imic.cdiatelv and daily aa recuired by the Technical Specification, Seet$en 3 5.E.2. '

ij f ~ Inventication and Corrective Acticn - Investigation revealed

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I th at the electrical to hydraulic transducer was not f un c tion--

ing' properly. This unit is called the EGR ACTUATOR in the Des cription Manual GEK-9597 - Page 27-16. The response was slow and believed to be due to shorted turns on a magnetic amplifier. A new EGR unit was obtained, tested, and RCIC was declared operable on April 18, 1972.

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Dr. Peter A. fiorris April 19,1972 Conclusion - The Reactor Core Isolation Cooling System was tested in accordance with the Quad-Cities !!uclear Power Station Startup Test' Instructions and was found deficient.

The cause of the incident 'f as a defective EGR unit which was replaced, tested, and the system was declared operable.

Very truly yours, COW"0!!'dEALTH EDISO'! COMPA!IY Quad-Cities flucicar Power Station

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?.4. Palmer Superintendent FAP/zm I

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