ML19254D368

Requests Exemption from Hydrostatic Testing Outlined in Summer 1978 Addenda to ASME Section Xi,Pressure Test Exemptions,In Ref to Deformed Pressurizer Relief Pipe Reported to IE

ML19254D368
Person / Time
Site:	Sequoyah
Issue date:	10/18/1979
From:	Mills L TENNESSEE VALLEY AUTHORITY
To:	Rubenstein L Office of Nuclear Reactor Regulation
References
NUDOCS 7910250401
Download: ML19254D368 (1)

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, [ 400 Chestnut Street Tower II October 18, 1979 Director of Nuclear Reactor Regulation Attention: Mr. L. S. Rubenstein, Acting Chief Light Water Reactors Branch No. 4 Division of Project Management U.S. Nuclear Regulatory Commission Washington, DC 20555

Dear Mr. Rubenstein:

In the Matter of the Application of ) Docet No. 50-327 Tenne.3ee Valley Authority ) During hot functional testing at Sequoyah Nuclear Plant unit 1 a hanger failed to slide and caused the six-inch pressurizer re' Lief piping to undergo plastic deformation. This condition was reported to NRC Office of Inspection and Enforcement in Nonconformance Report SWP-79-S-8. This deformed pipe was returned to its required shape by selective depos' tion of welding material. Subsequent to the welding, the weld area was examined by radiographic and liquid penetrant inspections in accordance with the requirements of ASME Section III. An ultrasonic test will be performed as required by ASME Ser. ion XI befere fuel loading of unit 1. TVA requests permission to use the exemptions from hydrostatic testing outlined in IWA 4400 of the Summer 1978 Addenda to ASME Section XI, Fcessure Test Exemptions. According to the October 9, 1979, editio-of the Federal Register, the NRC has amended 10 CFR 50.55a to allow use of this addenda subject to the approval of the Commission. TVA believes that exemptions from hydrostatic testing is justified and does not compromise the safety of the plant, for the following reasons:

1. The process of welding to realign the pipe did not pene? rate the pressure boundary (i.e., did not penetrate through the pipe wall). This was verified by radiographic examination.

2. The veld area was subject to all of the exarnination requirements of ASME Sections III and XI.

If you have any questions regarding this matter, please call David Lambert at FTS 854-2581. Very truly yours, TENNESSEE VALLEY AUTHORITY g P.^3vx SMg

                                                  . M. Mills, Manager hg N

Nuclear Regulation and Safety h} M'D

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