ML20085C939

Telecopy Ao:Average Power Range Monitor Reference Flows Found Approx 7% Greater than Indicated % of Rated Core Flow. Check of Drive Flow Transmitter Calibr to Be Performed

ML20085C939
Person / Time
Site:	Quad Cities
Issue date:	10/25/1974
From:	Kalivianakis N COMMONWEALTH EDISON CO.
To:	James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML20085C937	List: ML20085C934 ML20085C939
References
NJK-74-348, NUDOCS 8307130252
Download: ML20085C939 (1)

Text

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~

• Cr_ - ^_ :-?. Edison Cuad. Nuclear Pcher Station

.fi ~ Post . Box'216

.1 COrdova Hlinoi361242 Torephorte309/664 2241 g3

%T. Km74-348 ,

Telecopy . Region III, . Attentions -Mr. C. FeiArabend October 25, -1974 J. Keppler, . Regional'. Director

'Directorateaof. Regulatory Operations

/ Region III U.S. Atomic . Energy Ccenniasion 799 Rooseveit 1 Road Glen Ellyn, Illinois 60137

Reference:

Quad-Citics Nucinar Power Station, : Unit 2, Docket No.

50-265. .DPR-30, Appendix A, Sections 1. 0. A .1, 2.1. A .1, 6.6.B.1.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.1.a swithin"24. hours of the occurrenco.

The Unit .2 APRM-RBM reference flows .were found to be .approximately 7$ greater than the indicated percent .of rated -core flow. A core flow calibration' verified the accuracy of the indicated core flow.

. A check .of the . drive flow transmitter calibrations, which requires

.a 1/2...soram, will..be performed at the earliest . opportunity. .In the interim, the , gains of the total edrive flow proportional .ampli-fiers (2"260-BA and B) chave been adjusted so that the . APRM refer-ence . flows correspond to the ' core flow. This lends the required

. conservatism to the flow biased trip settings until further in-vestigation determines the :cause of the instrument drift.

This . occurrence was discussed ;by telephone with Mr. . Jordan of your office on October :25,1974. Further ~information .will be . pro- l vided by. Abnormal Occurrence 1 Report AO S0-265/74-26 .which will be ' submitted ..within 10. days .cof the -date :of ~.this . occurrence.

'Very truly yours,

.COMMONWEAZH'H - EDISON COMPANY QUAD-CITIES NUCLEAR POWB STATION Wh!vy AN. J.',Ka3.ivianakis

.cstation -superintendent

NJK/JS/sa .50 ' M' l

cc a . Directorate of Licentiing

.J..'s..Abel 1

J 8307130252 741104 -

gDRADOCK 05000265 PDR