ML20086K405

AO 74-38:on 740719,setpoint of Core Spray Sparger to Reactor Vessel Differential Pressure Switch DPIS-2-14-43B Found Less Conservative than Allowed by Tech Specs.Caused by Setpoint Drift.Switch Recalibr & Returned to Svc

ML20086K405
Person / Time
Site:	Peach Bottom
Issue date:	07/29/1974
From:	Cooney M PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC
To:	Giambusso A US ATOMIC ENERGY COMMISSION (AEC)
References
AO-74-38, NUDOCS 8401270073
Download: ML20086K405 (2)

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PHILADELPHIA PA.19101 AUG 11974" A k

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. >\ pp July 29, 1974 Mr. A. Giambuss Deputy Director of Reactor Projects 50-277 United States Atomic Energy Cormiission Directorate of Licensing Washington, DC 20545

Subject:

Abnormal Occurrence The following occurrence was reported to Mr. Donald Caphton, A.E.C. Region I Regulatory Operations Office on July 19, 1974. Writ- ,

' ten notification was made to Mr. James P. O'Reilly, Region I Regulatory Guc aiivn= Giii< e on .soiy i s, i9fh. in arcordaaca '." t h Sectien 6.7.2.P.

of the Technical Specifications, Appendix A of DPR-44 for Unit 2 Peach Bottom Atomic Power Station, the following report is being ;ubmitted to the Directorate of Licensing as an Abr,armal Occurrence.

Reference:

License Number DPR-44, Amendment Number 1

' Technical Specification Table 3 5.B Report No.: 50-277-74-38 Report Date: July 29, 1974 Occurrence Date:

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July 19, 19/4 Facility: Peach Bottom Atomic Power Station R.D. 1, Delta, Pennsylvania 17314 Identificatien of Occurrenc.e:

Setpoint of the Core Spray Sparger to Reactor Vessel differ-ential pressure switch, dPIS-2-14-438, found to be less conservative  ;

than allowed by the Technical Specifications.

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_ Conditions Prior to Occurrence:  !; rf ./

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8 The reactor was at 100% power. .l ,

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r1 Mr. A. Giambuss

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j Description of Occurrence:

During a routine instrument surveillance test the setpoint of dPIS-2-14-438 was found to have drifted outside the Technical Specification limits of 5 + 1 5 psid. The switch was found to trip at 6.7 psid.

Designation of Apparent Cause of Occurrence:

The cause of this setpoint failure is attributed to slight setpoint drift.

Analysis of Occurrence:

Due to the slight magnitude of the setpoint deviation, this occurrence has minimal safety implications.

Corrective Action:

The switch was immediately recalibrated and returned to service.

Very truly yours, 3

J)V ' uw

/ M . J,. C'o'o ne'y

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i Ass,' t Gen' 1 Superin'tendent.

4 Generation Division ~

cc: Mr. J. P. O'Reilly Director,. Region 1 linited States Atomic Energy Commission K ng of P us a, PA 19406 i

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