ML20086F929

AO 75-69:on 751021,nitrogen Found to Leak Out of Test Connection on Inboard Flange of AO-2519.Caused by Use of Wrong Connection for Testing Double O-ring Seal.Connection Capped & Leak Checked Successfully

ML20086F929
Person / Time
Site:	Peach Bottom
Issue date:	10/31/1975
From:	Cooney M PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC
To:	Boyd R Office of Nuclear Reactor Regulation
Shared Package
ML20086F930	List: ML20086F929 ML20086F933
References
AO-75-69, NUDOCS 8401090678
Download: ML20086F929 (2)

Text

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t o' PHILADELPHIA ELECTRIC COMPANY 2301 MARKET STREET , ..

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m October 31, 1975 W Trr.G.a:9 Mr. Roger S. Boyd Acting Director Division of Reactor Licensing Office of Nuclear Reactor Regulations United States Nuclear Regulatory Conmission Washington, DC 20555

Dear Mr. Boyd:

canG W Subj.ect: Abnormal Occurrence The following occurrence was reported to Mr. Walt Baunack, Region 1, Of fice of Inspection and Enforcement, United States Nuclear Regulatory Commission, on October 21, 1975 Written notification was made to Mr. James P. O'Reilly, Office of Inspection and Enforcement, Region I, United States Nuclear Regulatory Conmission on October 21, 1975 In accordance with Section 6 7 2.A of the Technical Specifications, Appendix A of DPR-44 for Unit 2 Peach Jottom Atomic Power Station, the following report is being submitted to the Directorate of Reactor Licensing as an Abnormal Occurrence.

Reference:

License Number DPR-44 Technical Specification

Reference:

4 7.A.2.f Report No.: 50-277-75-69 Report Date: October 31, 1975 Occurrence Date: October 21, 1975 Facility:

Peach Bottiom Atomic Power Station R.D. 1, Delta, Pennsylvania 17314 Identification of Occurrence:

A0-2519. 0-ring gasket leak on drywell and torus inerting N2 supply valve i

Conditions Prior to Occurrence:

Reactor power 56%.

Description of Occurrence:

While preparing to do a local leak rate test on the inboard flange of A0-2519, nitrogen was found to leak out of the test connection. 4 It was suspected and reported that the inner 0-ring leaked.

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COPY SENT REGION } 1 )

e Mr. Roger S. 8oyd O 50-277-75-69 October 31, 1975 Page 2 Designation of Apparent Cause of Occurrence:

During the investigation, it was determined that the connection that was used to do the test was not the connection for testing the doubic 0-ring seal. Instead, it connunicated directly with the Drywell and Torus Inerting Supply Line inboard of the outer isolation valve.

Analysis of Occurrence:

The other isolation valves associated with this penetration were closed at the time of the occurrence. Safety implications are therefore minimal.

Corrective Action:

The connection was capped and leak checked successfully. The 0-ring seals will be tested in the near future.

Failure Data:

None .

Very truly yours, M. . Cooney S erintendent Generation Division - Nuclear cc: Mr. J. P. O'Rei l ly Director, Region 1 Office of Inspection and Enforcement United States Nuclear Regulatory . Commission 631 Park Avenue King of Prussia, PA 19406 l

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