ML20086K443

Telecopy AO 75-12:on 750205,reactor Water Cleanup Sys Pump Suction Inner Isolation Valve Failed to Close.Cause Unknown. Final Investigation of Failure Will Be Performed When Reactor Shut Down & Drywell Accessible

ML20086K443
Person / Time
Site:	Peach Bottom
Issue date:	02/05/1975
From:	Ullrich W PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC
To:	James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML20086K436	List: ML20086K432 ML20086K443
References
AO-75-12, NUDOCS 8401270110
Download: ML20086K443 (1)

Text

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, Peach Cotton Atomic Power Stat' Delta. Tennoylvnnia 17314 Iabruary 5, 1975 Hr. James P. O'Reilly, Director United r.tates Atonic Energy Comission Nuclear Regulatory Comission 631 Park Avenue King of Prussia, Pennsylvania 19406

Subject:

A_bnormal occurreneo 24 tfour Notiffention Confircirg W. T. U11 rich's conversation with Mr. Walt Baunack, A.E.C. Region 1 Nacicar Regulatory Co::nission on February 5,1975.

References License Number DPR-44 Technical Specification

Reference:

3.7.D Report No.: 50-277-75-12 Report Date: February 5,1975 Decurrence Date: 11bruary 5,1975 Facilitys Peach Botton Atonic Power Station R.D. 1. Delta, Pennsylvania 17314 Identification of occurrences Pailure of Reactor Water Clean-Up Systen Pump Suction %nner ' Isolation Valve to close.

Conditions Prior to Occurrence:

Plant stable at approximately 100% power.

Descriptien of Occurrences During the performance of a surveillance test which verifies the operability of various PCIS valves, the RWCU Pump Suction Inner Isolation Valve, MD-12-15 failed to cicec in response to a close sinual.

Designation of Apparent Cause of Cccurrences Since the valve in located in the drywell which is inaccessible during power operation, the investigation has been limited. This limited investigation indicates possible limitorque operator or notor dif ficulties. Actual cause of failure la unknown at this time.

Analysis of Occurrenco:

The surveillance touc performed verified that the in series outer isolation valve on the RWCUS was operable. This valve would satisfy the isolation function.

Safety ieplications of this failure are therefore ninimal.

Corrective Action:

Pinal investigation of the failure of this valve to close and subsectuent repair t ', vill bo perforced when the reactor is shutdown and the drywall is accessible. Th*

outer isolation valve was closed to isolate this penetration.

Failure Datat Kone.

Very truly yours,

}UT [WAY.)

W. T. Ullrich, Supiarintendent Peach Bottoa Atomic Power Station 8401270110 750215 ,

PDR ADOCK 05000277 PDR 6

S REGULATORY OPERATIONS FILE COPY I