ML20084F049

Ao:On 720203,power Range High Setpoint on Nuclear Power Channel N-41 Found Exceeding Tech Spec Limits.Caused by Shift of Low Voltage Supply.Channel Realigned within Proper Limits

ML20084F049
Person / Time
Site:	Ginna
Issue date:	02/07/1972
From:	Amish K ROCHESTER GAS & ELECTRIC CORP.
To:	Morris P US ATOMIC ENERGY COMMISSION (AEC)
Shared Package
ML20084F052	List: ML20084F049 ML20084F061
References
NUDOCS 8304200018
Download: ML20084F049 (1)

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February 7,1972 x.=

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m 'c f.M ,*.k v, 3 i Dr. Peter A. Morris, Director Division of Reactor Licensing M m. p /Q p' t jJ-p! f(j U . S. Atomic Energy Commission Washington, D. C. 2054 5 yh N d,b j) ik,)

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Detection of Nuclear power channel drift during h.6

Subject:

bi-weekly surveillance test Q/,T'~l'[fd' M#

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g R. E. Ginna Nuclear Pcwcr Plant Unit No.1 ,

Docket No. 50-244 t,

Dear Dr. Morris:

On February 3,1972 during the routine bi-weekly PT 6.3 Surveillance Test  ;

(Periodic Test - NIS Powcr flange Channels) the power range high setroint on Nuclear Power Channel N-41 was found to be at 110 percent of rated ["

power . This value exceeded the Limiting Safety System setting of ~.; 109 percent as setforth in Section 2.3.1.2 of the Technical Specifications and accordingly constitutes an abnormal occurrence.

With the channel in a trip mode, investigation revealed that the lov ve?tage supply had drifted out of its specifications of i .025 volt tolerance. The g-channel was realigned to within proper limits and rotested sansfactorily. P aring Normally two of the four channels , o necessary for a trip conttion.

the testing and realignment the redur %nce w:2s r'. iaced to e one of three channels needed for a trip. All channeic 2 et.;uequenily tested satis-factorily.

The last complete alignment of all tne power channels was made on November 11, 1971.

The Plant Operations Review Ccmmittee reviewed the occurrence and recom-monded that the data of the tests be more closely observed for trendin light of the shortness of the time period since the full alignment of these protection channels.

Very truly yours ,

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,jgh ' /h //. Lf f Keith W. Amish f

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