ML20086K608

AO 74-49:on 741107,setpint Shift Found on RCIC Steamm Line High Flow Isolation Switch DPIS-2-13-83.Caused by Setpoint Shift.Switches Adjusted & Checked for Proper Calibr

ML20086K608
Person / Time
Site:	Peach Bottom
Issue date:	11/17/1974
From:	Cooney M PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC
To:	Giambusso A US ATOMIC ENERGY COMMISSION (AEC)
References
AO-74-49, NUDOCS 8401270358
Download: ML20086K608 (2)

Text

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November 17, 1974 '

So- 277 tjr. A. Giambusso Deputy Director of Reactor Projects United States Atomic Energy Commission Directorate of Licensing Washington, D.C. 20545

Subject:

Abnormal Occurrence The following occurrence was reported to Mr. Don Caphton, A.E.C. Region 1 Regulatory Operations Office on November 8,1974.

Written .loti fication was made to Mr. James P. O'Reilly, Region 1 Regulatory Operations Office on November 8,1974 In accordance wi th Section 6.7.2.A of the Technical Specifications, Appendix A of DPR-44 for Unit 2 Peach Bottom Atomic Power Station, the following report is being submitted to the Directorate of Licensing as an Abnormal Occurrence:

Reference:

License Number DPR-44, Amendment Number 1 Technical Specification Table 3 2.B Report No.: 50-277-74-49 Report Date: November 17, 1974 Occurrence Date: November 7,1974 Faci li ty: Peach Bottom Atomic Power Station R.D. 1, Del ta, Pennsylvania 17314 Identi fication of Occurrence:

Setpoint shi f ts on RCIC Steam Line Hi Flow Isolation Swi tch, dPIS-2-13-83.

Condi tions Prior to Occurrence:

Plant Shutdown.

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Mr. Giambusso

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! Description of Occurrence During routine instrument surveillance testing; dPIS-2-13-83

was found to trip at 455 inches H 2O differential and 451 inches H 2O differential on switches 1 and 3 respectively. The Technical Spectfication limit is i450 inches H2 O differential.

Designation of Apparent Cause of Occurrence:

Setpoint shi f t wi thin the accuracy of the instrument.

. Analysis of Occurrences The safety implications are minimal since the setpoint shif t was very small and the companion redundant switch was tested 6nd found to trip wi thin the Technical Speci fication limi ts.

Corrective Action:

The swl tches were adjusted and checked for proper cali bra tion

- in accordance with the applicabic survei11ance test.

Failurn Data:

A similar setpoint shif t of dPIS-2-23-76 was reported on

. 9/20/74 as Abnormal Occurrence 50-277-74-41.

Very truly yours,

//'ha. :n c./

M..J. Cooney ,

l Ass' t Gen'1 Sdperintendent Generation Division i

cc: Mr. J. P. O'Reilly Director, Region 1 l

Uni tod States Atomic Energy Conmission l -

631 Park Avenue King of Prussia, PA 19406 1