ML20086F890

Telecopy AO 75-74:on 751116,setpoint of RCIC Steam Supply Line High Temp Switch TE-TS 4939A Found Less Conservative than Allowed by Tech Specs.Caused by Slight Setpoint Drift. Switch Recalibr & Returned to Svc

ML20086F890
Person / Time
Site:	Peach Bottom
Issue date:	11/17/1975
From:	Ullrich W PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC
To:	James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML20086F888	List: ML20086F880 ML20086F890
References
AO-75-74, NUDOCS 8401090630
Download: ML20086F890 (1)

Text

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Peach Bottom At.omic Po O Station Delta, Pen n sylvstri a 17314 November-17, 1975 Mr. James P. O'Rei11y, Director Office of Inspection and Enforcement ,R

Region 1 6t'(( \W424//J74L6 United States Nuclear Regulatory Commission 631 Park Avenue

• King of Prussia, Pennsylvania 19406

Subject:

Abnormal occurrence 2h-Hour Notification "

Confirming R. S. Fleischmann's verbal conversation with Mr. Walt Baunack, Region 1, United States Nuclear Regulatory Commission on November 17, 1975

Reference:

License Number DPR-hh Technical Specification

Reference:

Table 3.2.B Report No.: 50-277-T5-74 Report Date: November 17, 1975 Occurrence Date: November 16, 1975 Facility: Peach Bottom Atomic Power Station R.D. 1, Delta, Pennsylvania 17314 Identification of Occurrence:

Setpoint of RCIC steam supply line high temperature switch, TE-TS h939A, found to be less conservative than allowed by the Technical Specificationg Conditions Prior to Occurrence:

Unit 2 shutdown, reactor vessel head removed for scheduled outage work.

Description of Occurrence:

During a routine instrument surveillance test the setpoint of TE-TS h939A van found to have drifted 2 F above the Technical Specification's limit of 200 F.

Designation of Apparent Cause of Occurrence:

Slight setpoint drift.

Analysis of Occurrence: '

Since the reactor vessel was depressurized (vessel head removed) and the cetpoint drift was slight, this occurrence has minimal safety implications. .

Corrective Action:

The switch was immediately recalibrated and returned to service.

Failure Data:

None previous.

Very truly yours,

/&rc V. T. Ullrich, Superintendent Peach Bottom Atomic Power Station ble 8401090630 751126 PDR ADOCK 05000277 PDR g

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