ML20086H090

Telecopy AO 75-67:on 751021,torus Makeup Supply Isolation Check Valve 276Y Found Leaking in Excess of 2,000 Cc/Minute. Cause Under Investigation.Corrective Actions to Be Determined After Investigation

ML20086H090
Person / Time
Site:	Peach Bottom
Issue date:	10/21/1975
From:	Ullrich W PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC
To:	James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML20086H089	List: ML20086H085 ML20086H090
References
AO-75-67, NUDOCS 8401130423
Download: ML20086H090 (1)

Text

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                                                  ,-                                                       PHILADELPHIA ELECTRIC COMPANY v,
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• Peach Motton Atomic Power Station Delta. Pennsylvania l II31 October 21, 1975

                    .                                   Mr. James P. O'Reilly, Director                                                 .                        .

Office of Inspection and Enforcement' _s , t U 631 Park Avenue States Nuclear Regulatory Commission g d4/Y7M

                                     .                King of Prussia, PennsWivania                                            19k06

Subject:

Aboormal Occurrence PL-Hour Notification , Confirming'R. S. Fleischmann 's phone conversation with Mr. Walt Baunack,

                                                . . Region 1. United States Nuclear Regulatcry Conmission on October 21, 1975                                                                                          ~

Reference:

Lice 5se Number DPR-56

                                                              . . . _ .                         P=ahn4eal Speci.ficmAdon 

Reference:

Table 3.7.k . _ . . _.

i. Report No.: 50-278-75-67 '

Report Date: October 21, 1975 Occurrence Date ,0ctober 21, 1975 {' Facility: Peach Bottom Atomic Power Station R.D. 1. Delta, Pennsylvania 1731L l I5entification of Occurrence:

   ,'l                                                      Excessive leakage thru the 1" - 276Y check valve in the nitrogen inerting system dryvell purge supply to penetration U-205B.

Conditions Prior to Occurrence:

                                   ;                        Reactor power 555.                                                                                              -

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                                       . .           Description of Occurrence:

e DurinE local leak rate testing of the torus make-up supply isolation check valve, it was found to leak in excess of 2000 cc/ min.

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Designation of Apparent cause of Occu,rrence: -

            , J.                               ,            Under investigation.

I, i - Analysis of Occurrence: s . .

                 ,.                   ,                     The safety implications cf this occurrence are minimal beenuse
                                                            ; manual isolation valve was closed when the leakage was detected.

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Corrective Action: i To be determined after investigation. The nanual isolation valve

        !.,                                                 was vcrified to be leak ti6ht in the closed condition. This valve
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        ;                                                 - will be naintained in the closed condition until repairs are 1, } -..

conpleted. ' i Failure Data: i Abnornal Occurrence Report Numbers 50-277-75-33, 50-277-75-25 and

                                  .                         50-2TT-75-1T.

Very truly yours,

                                           ,         M W. T. Ullrich, Superintendent Peach Botton Atomic Power Station N

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