ML20083H766

Final Deficiency Rept Re Itt Grinnell Weld Radiographs of T-quenchers & Piping Equal or Greater than 1/2 Inch. Initially Reported on 830119.Fifty-three Welds Found to Have enhancements,37 Reradiographed & Determined Acceptable

ML20083H766
Person / Time
Site:	Nine Mile Point
Issue date:	12/19/1983
From:	Mangan C NIAGARA MOHAWK POWER CORP.
To:	Starostecki R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
References
(7821), NUDOCS 8401130342
Download: ML20083H766 (2)

Text

2 M V NIAGARA RUMOHAWK NIAGARA MOHAWK POWER CORPORATION /300 ERIE BOULEVARD V'EST. SYRACUSE, N Y.13202/ TELEPHONE (315) 474-1511 o-December 19, 1983 (7821)

Mr. R. W. Starostecki, Director U.S. Nuclear Regulatory Commission Region I Division of Project and Resident Programs 631 Park Avenue King of Prussia, PA 19406 Re: Nine Mile Point Unit 2 Docket No. 50-410-

Dear Mr. Starostecki:

Enclosed is a final report in accordance with 10CFR50.55(e) for the problem concerning ITT Grinnell radiographs for welds of T-quenchers and pipes with wall thickness equal to or greater than 1/2 in. Mr. H. Kister of your staff was informed, via telecon, of the condition concerning T-quencher walds on January 19, 1983, and the condition concerning other pipe welds on May 23, 1983.

Very truly yours, MW C.V.ManNn Vice President Nuclear Engineering & Licensing CVM/TL:ja Enclosure xc: Director of Inspection and Enforcement U.S. Nuclear Regulatory Commission Washington, DC 20555 Mr. R. Gramm, Resident Inspector 1

B401130342 831219 gonApocKoscoog

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NIAGARA M0 HAWK POWER CORPORATION NINE MILE POINT UNIT 2 DOCKET N0. 50-410 of Final Report for a Problem Concerning the ITT Grinnell Weld Radiographs of T-Quenchers and Piping

.. 1 Equal to or Greater than 1/2 Inch Description-of the Problem A review of ITT Grinnell Corporation shop weld radiographs of T-quencher, Mark No. 2SVV*DIFF127, indicated that there was an attempt to artificially enhance a radiograph for weld F.

This weld is ASME Code Class 3.

This item has been identified in Stone & Webster Engineering Corporation Nonconformance and Disposition Report No. 4262.

As a result of this finding, additional weld radiographs of other T-quenchers and piping with wall thickness equal to or greater than 1/2 inch were reviewed both at the jobsite and at ITT Grinnell's shop at Kernersville, North

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Carolina. As a result, a total of 53 weld radiographs (including radiographs for weld F identified above) w re found to have enhancements.

Analysis of Safety Implications Out of the 53 welds found to have enhancements, 37 were reradiographed and found to be acceptable. Ten welds were not reradiographed because they had been eliminated (i.e., no longer exist) due to other reasons (e.g., spool cancellation due to design change, etc.). The remaining six enhanced weld radiographs were for the weld material buildup at the service water system

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pipe end preparations prior to the welds being completed in the field.

It was not possible to reradiograph the weld material buildup only, due to the subsequently mace field weld. Additionally, the ASME Code requires, as a minimum, only magnetic particle testing for these weids. Magnetic particle e

testing for the weld material buildup was also initially performed at ITT Grinnell's shop at Kernersville, and it provided satisfactory results.

However, the e welds were identified on ITT Grinnell Nonconformance and Disposition Report Nos. IG529 through IG533 and IG536.

The field welds were cut out and the remaining shop weld material buildups were found to be acceptable after radiographic testing.

We therefore believe that if this problem were to have remained uncorrected, it would not have adversely affected plant safety.

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