ML20086H081

Telecopy AO 75-68:on 751021,torus Makeup Sys Isolation Valve AO-3523 Found to Leak in Excess of 2,000 Cc/Minute.Cause Under Investigation.Corrective Action to Be Determined After Investigation

ML20086H081
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
ML20086H079	List: ML20086H075 ML20086H081
References
AO-75-68, NUDOCS 8401130408
Download: ML20086H081 (1)

Text

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PHILADELPHIA ELECTRIC COMPANY Peach Botton Atonic Power Station l'. '

, Delta,. Pennsylvania 1731k October 21 1975

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

Office of Inspecticn and Enforcenent' '

Region 1

. p g h dih77 United States Nuclear Regulatory Connission

• . 631 Park Avenue

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. King of Prussia, Pennsylvania 19h06

Subject:

Abnormal Occurrence 2k-Hour Eotif1 cation.

. Confirming R. S. Fleischmann's phone conversation with Mr. Walt Baunack,

, Region 1, United States Nuclear Regulatory Conmission,or October 21.1975

Reference:

License Number DPR-56 Technical Specification

Reference:

Table 3.7.h

i. deport so.

Du-zyc-f>-co I. ' , Report Date: October 21 19T5 J ,

, Occurrence Date: October 21, 1975 Facility: Peach Botton Atomic Power Station R.D. 1. Delta, Pennsylvania 17314 *

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l Identification of Occurrencer

.  % ' Excessive leakage thru the nitrogen inerting systen dryvell purge supply isolation valve AO-3523 - penetration N-25 Conditions Prior to Occurrence:

.. 3 Reactor at 555 power.

.' Description of Occurrence:

During local leak rate testing, the torus makeup supply isolation

., valve A0-3523 was found to leak in excess of 2000 cc/ min.

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Designation of. Apparent Cause of Occurrence:

Under investigation.

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Analysis of Occurrence:

The safety implications of ,this occurrence are minimal because manual isolation valve was closed when the leakage was detected.

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f ." Corrective Action:

. To be determined after investigation. The manual isolation valve

, . was verified to be leak tight in the closed condition. This

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valve vill be maintained.in the closed condition until repairs are completed.

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Failure Data:

- I, i Not applicable..

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• Very truly yours,

. ,qpp d%T l j .. W. T. Ullrich, Superintendent j l Peach Botton Atomic Power Station t~

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