ML20086K594

AO 74-51:on 741113,setpoint Shift Found on ECCS High Drywell Pressure Initiation Switch PS-2-10-101A.Caused by Setpoint Shift.Switch Checked to Determine Cause of Setpint Shift

ML20086K594
Person / Time
Site:	Peach Bottom
Issue date:	11/23/1974
From:	Cooney M PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC
To:	Giambusso A US ATOMIC ENERGY COMMISSION (AEC)
Shared Package
ML20086K598	List: ML20086K594 ML20086K600
References
AO-74-51, NUDOCS 8401270337
Download: ML20086K594 (2)

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PHILADELPHIA ELECTRIC COMPANY -

2301 MARKET STREET ..

PHILADELPHIA. PA.19101 '

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. t.N tJovember 23, 1974 p. g M',

Mr. A. Giambusso f" Deputy Director of Reactor Projects Uni ted Sta tes Atomic Energy Cocmission @["*#' ' q/,n$

C ]2 Directora te of Licensing Washington, D.C. 20545

Subject:

Abnormal Occurrence The following occurrence was reported to fir. Walt Daunack, A.E.C. Regi on 1 Regula tory Operatiens O f fice on November 14, 1974 Wri t ten noti fica tion was made to tir. James P. O'Reilly, Region 1 Regula tory Opera tions Office on flovember 14, 1974 In accordance with Section 6.7.2. A of the Technical Speci fications, Appendi x A of DPR-44 for Uni t 2 Peach Bot tom Atomic Power S ta tion, the following report is being submi tted to the Directorate of Licensing as an Abnormal Occurrence:

Reference:

License tivtrher DPR-44, Amendment t1 umber 1 Technica l Specifica tion Table 3.2. A Report tio.: 50-277-74-51 Report Date: tiover:be r 23, 1974 Octurrence Date: !Jovcebe r 13, 1974 i Faci l i ty: Peach Gottom Atomic Power Station R.D. 1, Delta, Pennsylvania 17314 Ideriti fica tion of Occurrence:

Setpoint shif t on ECCS Hi Drywell Pressure initiation suitch PS-2-10-101A.

Condi tions Prior to Occ"rrence:

Uni t 2 at 90% power.

B401270337 741123 r, c e PDR S ADOCK 05000277 1.W3 ppg -

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/ lMr. A. Giambusso Page 2, Nove.mber 23, 1974 Description of Occurrence:

During routine instrument surveillance testing, this swi tch was found to trip at 2.18 psig. The Technical Specification limit is less than or equal to 2 psig.

Designation of Apparent Cause of Occurrence:

Setpoint shi f t.

Analysis of Occurrence:

Since the setpoint shif t was only slight and this switch opera tes in a one-out-of-two twice logic, the safety implications of this occurrence are minimal.

Cor_rective Action:

The switch was checked to determine the cause of the setpoint shi f t. No speci fic cause was identi fied. The switch was reset to a value within the Technical Specification limits, setpoint checked using the appropriate surveillance test, and returned to service.

Failure Data:

No previous failures of this type for this type and range of switch.

Vcry truly yours, 1

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H. J. Cooney Asst. Gen 1. Supt.

Generation Division cc: Mr. J. P. O'Reilly Di rector, Region 1 Uni ted S ta tes A tomic Energy Commissi on

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631 Park Avenue King of Prussia, PA 19406 l

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