ML20084A194

AO 3-2-18:on 731219,analysis of Monthly Pressurizer Pressure Tests Indicated Low Setting for One Bistable.Bistable Recalibr & Sensitivity of Bistable Setpoints Under Investigation

ML20084A194
Person / Time
Site:	Indian Point
Issue date:	01/04/1974
From:	Cobean W CONSOLIDATED EDISON CO. OF NEW YORK, INC.
To:	Oleary J US ATOMIC ENERGY COMMISSION (AEC)
Shared Package
ML20084A196	List: ML20084A194 ML20084A207
References
AO-3-2-18, NUDOCS 8304050124
Download: ML20084A194 (2)

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gW Consolidated Edison Company of New York. Inc.

h dE 4 (rving Place, New York, N Y 10003 December 21, 1973

', [' Re Indian Point Unit No. 2 j Facility Operating License DPR-26 A.O. 3-2-18 Mr. James P. O'Reilly, Director

. Regulatory Operations, Region I

U. S. Atomic Energy Commission j ,631 Park Avenue .

! , King of Prussia, Pennsylvania 19406',

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Dear Mr. O'Reilly,

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The following report of Abnormal Occurrence No. 3-2-18 is provided pursuant to the requirements of Section 6.12.2(a) of che Technical specifications to Facility Operating License No. DPR-26. - -

On Deceinber 19, 1973 an analysis of the results of monthly periodic testo and calibration checks relating to pressurizer

, pressure indicated that the setting for one of the three bi-stables associated with low pressurizer pressure safety injec-tion was slightly below that required by Item 3 in Table 3-l~of the Technical Specifications. At the time of these periodic tests and calibration checks the reactor was in the cold shut-down condition for maintenance work associated with repairs to the feedwater piping for No. 22 steam generator.

l This particular bistable device is part of a two out'of three logic system which provides for a safety injection signal

! on coincidence of low pressurizer pressure and low pressurizer level. The-setpoint was found at 1680 psig instead of 11700-L psig as required by the Technical Specifications. The other two biotabica of the cyntem were found to be operating correctly.

l The channel annociated with this device was recalibrated and re-tested saticfactorily.

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Mr. James P. O'Reilly -

2- December 21, 1973 As indicated in the December 18, 1973 report of Abnomal Occurrence No. 3-2-17, our Engineering Department is perform-ing a detailed analysis relating to instrument drift which we also feel was the cause of this discrepancy. Our report on this occurrence will cover the current status of that analy-cis. Mr. Bert Davis of your office was notified of this occur-rence by Mr. John Me.kepeace by telephone on December 19, 1973.

very truly yours,

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, Warren R. Cobean, Jr.

, M'anager, Nuclear Power G'eneration cc Mr. John F. O' Leary l .

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