ML20062H700

Comments on Differing Prof Opinion on Weld Repair of Pressurizer Relief Pipe.Type of Repair Is Common & Accepted Method.Inservice Insp Program Augmented W/Ultrasonic Techniques Should Be Implemented

ML20062H700
Person / Time
Site:	Sequoyah
Issue date:	06/30/1980
From:	Noonan V Office of Nuclear Reactor Regulation
To:	Vollmer R Office of Nuclear Reactor Regulation
Shared Package
ML20062H675	List: IR 05000327/1980012 ML20062H670 ML20062H676 ML20062H682 ML20062H690 ML20062H693 ML20062H695 ML20062H700 ML20062H704 ML20062H707 ML20062H710 ML20062H713 ML20062H719
References
NUDOCS 8008210265
Download: ML20062H700 (2)

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,l JUN 3 01580 MEMORANDUM FOR: Richard H. Vollmer, Director Division of Engineering, NRR FROM: Vincent S. Noonan, Assistant Director Materials & Cualifications Engineering, CE

SUBJECT:

COMMENTS ON THE DIFFERING DROFESSIONAL OPINION ON SE000YAH WELD REPAIR OF DRESSURIZER RELIEF PIPE (J. HALAPATZ)

Based on my discussions with Mr. J. Halapat: and other staff members of both

'IRR ano I&E, I have the following comments on the subject matter.

1) Weld drawcead repair of the type used at Sequoyah is a common and accepted method of repair.

2) The individual technical points made by Mr. Hala:at: are generally correct and have merit, but I have found no other staff memoer :na has raised a significan Safety pr0blem concerning inis nele repair einer than Mr. Halapat: in his June 15, 1930 memorandum to Mr. S. Pawlicki (Ref, o nge 3. Paragra:n 3).

3) The staff has a commitment frem the licensee to include the recair welcs in :ne ISI program.

Recomr'enca tio ns I believe tha: the repair weld is representative of many of ne repair welds allowed by the Code. However, ! do feel that including these repair welds in :ne normal ISI program is not sufficient.

I would strongly recommend that an augmentec ISI program be imolementec, to have the pressuri:er weld repairs insoected using ultra-sonic tecnnicues, curing :ne nex three refueling outages. If no crack like incica-ions are founc during these inscettions, then I would recommend reverting to :ne clant's nor-tal ISI Oregram, maintaining these carticular welds in :nat insoection program.

I co not crocose the AISI acproacn cecause of any significant safety concern, tu: as a defense in cactn conces: to detect IGSCO crier to small leaks :na:

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Richard H. Vollmer JUN 3 0 560 could possibly occur. This will provide added assurance that the integrity of tne weld repair, including our system safety margins, are being maintained.

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Vincent S. Noonan. Assistant Director Materials & Qualifications Engineering Division of Engineering 3

Enclosures :

.l . Memo Gamble to Halapat: .

, dtd 6/22/80

, 2. Note Sambie to Pawlicki ctd 6/27/90

3. Memo Pawlicki to Noonan dtd 5/27/20

w/o encls:

S. 8swlicki R. Gamble J. Halaca::

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