ML17252A877

Letter Regarding a 12/17/1973 Analysis of Results of Periodic Tests and Calibration Checks Relating to Pressurizer Level Indicated a Setting for One of the Bistables Was Above the Technical Spec. Limit - Indian Point Unit 2

ML17252A877
Person / Time
Site:	Indian Point
Issue date:	12/18/1973
From:	Cobean W Con Edison, Consolidated Edison Co of New York
To:	O'Reilly J US Atomic Energy Commission (AEC)
References
Download: ML17252A877 (2)

Text

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. . December lB, 1973 Re: .. Indian Point Unit No. 2 Facility Op~rating License DPR-26 A.O. 3-2-17

• • .. Mr *. Jam~s P. O'Reilly, Direct01.~

Reg~latory *operations, Region I

u. s. Atomic Energy. Commissi~n 631 ~ark Avenue .

king of Prussia, ~ennsylvania i9406

Dear Mr. O'Reilly,

The following report of Abnorm~l* Oocur1:ence No. 3-2-17 is

'Provided pursuant to the requireme~te* of Section G.12.2(a) of the T~ohnioal Specifications to Facility Operating License No.

PPR-.26.

On Decemb.~r 17 1 1973 an analysis of the results of periodic tests and calibration checks relating to pressurizer level in-dica~ed that the setting for one of three biatables associated

ith high pressux:-izer level reactor trip wa15 slightly above thr.tt

• required by Teclinical Specificatjon 2.3.1.C(l). At the time of the1_3e periodic tests and calibration c.heoks, the reactor was in the cold shutdown condition for maintenance work associated with repairs to the feedwater piping for No. 22 steam generator*.

• ~lis particular bistable device is part of a tw6 out of ;three logic system which provides for *a reactor trif.' signal on high pres-su~i~er level. The setpoirit was found to be at 92.25% cif span in-.

stead of the 'S. 92~ of span required by the Technical Specifications.

The other two bistables of the system were found to be operating correctly. The chahnel associated with this device was recalibrated and ~etested satisfactorily4 .

,w, believ~ the observed discrepancy to be th~ result of in*

strument drift and have requested. our Engineering Department to provide a detailed analyses of the capability of the instrument buses .to sustain the applied loading and th~ harmonic wave effect on power supplies, bistables, converters etc. As part of the annly-

. ses, the effect of voltage swings on the equipment listed above

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Mr~ James P. O'Reilly .December 19,

• 1973

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• Indian Point Unit No. 2

=. Facility Operating License I>PR--26 A.O. 3-2-17

• .will be evaluatad. Based on these analy'ses, appropriate cor-rective action will be taken. Mr. Dert Davis of your office was notified of this occurrence by Mr. Johri Makepeace by tele-phone on December 17, 1973.

Very truly yours,

..U!)uh,\J,11. 12{~,~~": \

Warren *R. Cobean, Jr *. , J..!anager Nuclear Power Generation cc: Mr. John F. O'Leary

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