ML20086K428

Telecopy AO 75-13:on 750205,setpoint Shift Found on RCIC Steam Line High Flow Isolation Switch DPIS-2-13-84.Caused by Setpoint Shift.Switches Adjusted & Checked for Proper Calibr

ML20086K428
Person / Time
Site:	Peach Bottom
Issue date:	02/06/1975
From:	Ullrich W PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC
To:	James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML20086K427	List: ML20086K425 ML20086K428
References
AO-75-13, NUDOCS 8401270089
Download: ML20086K428 (1)

Text

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0PHILADELPHIA ELECTRIC COMPANY 0 .we2r ..

Peach Botton Atomic Power Station Delta, Pennsylvania 17314 February 6,1975 Mr. James P. O'Reilly, Director . . . .

United States Atomic Energy Comunission ~

Nuclear Regulatory Commission 631 Park Avenue ,,

Kin 3 of Prussia, Pennsylvania 19405

Subject:

Abnormal Occurrence 24-Hour Notification CEfirming W. T. U11 rich's conversation with Mr. Walt Baunack A.E.C.

R031on 1 Nuclear Regulatory Connissiont', on February 5.1975.

E R3forence: License Number DPR-44 Technical Specification

Reference:

Table 3.2.B Report No.:

50-277-75-13 Report Date: February 6, 1975 ~

Occurrence Date: February 5, 1975 Peach Botton Atomic Power Station Facility: '

R.D. 1. Delta. Pennsylvania 17314 .

Id ntification of Occurrence:

Setpoint shift on RCIC Steam Line Hi Flow Isolation Switch dPIS-2-13-84 Ccaditions Prior to Occurrence: . _ _,_

Unit 2 at full power, ww Daccription of Occurrence During routine instrument surveillance testing..dPIS-2-13-84 was found to trip at 453 inches H20 The Technical Specification limit is <_ 450 inches H2O differential.

Denignation of Apparent Canae of Occurrence: -

Setpoint shift within the accuracy of the instrument.

Antalysis of Occurrence: "*

The safety implications are minimal since the setpoint shift was very small and the companion redundant switch was tested and found to trip within the Technical Specificction limits. .

Corrective Action:

The switches were adjusted and checked for proper calibration in accordance with the applicable surveillance test.

Failure Data: -

Similar setpoint shif :s reported as Abnormal Occurrences 50-277-74-41, 278-74-21 and 50-277-74-49 e401270089 750215  ;

PDR ADOCK 05000277 Vory truly yours, S PDR WCW -

W. T. Ullrich, Superintendent REGULA1 DRY OPERATIONS Pacth Bottom Atomic Power Station _

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