ML20086K329

AO 75-17:on 750212,check Valve 276Y Downstream of AO-2969-B Failed Leak Rate Test.Caused by Damage Valve Seating Surfaces.Addl Duplicate Check Valve Installed in Line Between Air Operator Block & Containment Penetration

ML20086K329
Person / Time
Site:	Peach Bottom
Issue date:	02/21/1975
From:	Cooney M PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC
To:	Giambusso A Office of Nuclear Reactor Regulation
Shared Package
ML20086K331	List: ML20086K329 ML20086K343
References
AO-75-17, NUDOCS 8401270031
Download: ML20086K329 (2)

Text

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PHILADELPHIA ELECTRIC COMPANY [ ,,f f.N 2301 MARKET STREET [ /) .\

PHILADELPHI A. PA.19101 /* . . * , f

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February 21,1975 Mr. A. Gianbusso, Director Divisien of 3cactor Licensing Office of Nuclear Reactor Regulations United States Nuclear Regulatory Ccertission Washingten, D.C. 20$$$

Subject:

Abnorrtal Occurrence The following occurrence una reported to Mr. Walt Baunack, Region 1, Office of Inspection and Enforecnent, United States Nuclear.

Regitlatory Oc=tission on February 13,1975 Written notification was made to Mr. Jancs F. O'Reilly, Office of Inspcetion and Enforecncnt, Region 1, United Jtates Nuclear Regulstory Cemission on February 13, 1975 In accordance with Section 6 7 2.A of the Technical Specifications, Appendix A of DPR-S for Unit 2 Peach Bottcra Atenic Power Staticn, the following report is being submitted to the Directorate of Reactor Licensing sa en Abnonnal Occurrence.

Rcferencc: License Number DPR-M Technical Specification Referenec: h.7. A.2.f Report No.: 50-277-75-17 Report, Dato Fcbruary 22,1975 Occurrence Date: February 12,1975 Facility: Peach Bott=1 Atenic Power Station R.D.1, Delta, Pennsylvania 1731h Identification of Occurrence:

Check valve (1" - 276Y) imediately downstream of A0-2969-P (Instrunent Nitrogen Systcrt) failed leak rato test.

Conditions Pr5 or to Occurrence:

Unit 2 shutdown for piping inspcotion. (IE Bulletin 75-1).

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Mr. A. Gianbusso Febnt:ry 21,1975 Pags 2 -

Description of Occurrence:

During a routine local leak rate test the above identified check valve was found to leak in excess of acceptable values.

Designation of Apparent Cause of Occurrence:

The valve seating surfaces were damaged, resulting in excessive leakage.

Analysis of Occurrence:

The safety implications of this occurrence are minimal since the downstream isolation valve, A0-29693, was found to close and seal satisfactorily.

Corrective Action:

An additional duplicate check valve was installed in the line between the air operated block valve A0-299693 and the containment penetration. This valve was satisfactorily leak teated.

Very truly yours, M. . Cooney As t Gen'1 Supertntendent Generation Division cci Mr. J. P. O'Reilly Director Office of Inspection and Difortanent ,

Region 1 United States Nuelcar Regulatory Cammission 631 Park Avenue King of Prussia, PA 19h06

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