ML20072J586

Part 21 Rept Re Spot Welds in Bailey Controls Co Cabinets W/Smaller Diameter than Specified.Cabinets Strengthened by Seam & Edge Welding or Bolting

ML20072J586
Person / Time
Site:	Bellefonte, 05000000, Washington Public Power Supply System
Issue date:	06/23/1983
From:	Taylor J BABCOCK & WILCOX CO.
To:	Deyoung R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE)
References
REF-PT21-83 NUDOCS 8306300159
Download: ML20072J586 (2)

Text

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Utility Power Generation Division Babcock & Wilcox -

a McDermott company 3315 Old Forest Road P.O. Box 1260 Lynchburg, Virginia 245051260 (804) 385 2000 June 23, 1983 Mr. R. C. DeYoung, Director Office of Inspection and Enforcement U. S. Nuclear Regulatory Commission Washington, DC 20555

Dear Mr. DeYoung:

The purpose of this letter is to inform you of a concern reported to Babcock & Wilcox Co. , Uti'lity Power Generation Division (UPGD) in Lynchburg, Virginia by Bailey Controls Co., (BCCo).

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The concern may be described as follows: During December, BailGy Controls Co., made a source inspection of cabinets manufactured by Systems Control, Iron Mountain Michigan, in which they witnessed cabinet fabrication and observed that certain cabinet assembly' spot welds were 0.190" in diameter rather than 0.280" as specified by BCCo. The normal BCCo observation and inspection point is after a paint primer coat is applied and the size of the spot weld would not be detectable under those conditions.

l BCCo performed an analysis that demonstrated the 0.190" diameter l weld would be satisfactory provided-there was sufficient weld strength. Subsequent testing indicated the strength required by that analysis was not present.

BCCo believes the concern is applicable to all the 140 cabinets j manufactured by this vendor. Two UPGD nuclear contracts were due i to receive a number of these cabinets. The contracts are:

'TVA, NSS 15 and 16, Bellefonte 1 & 2

• Supply System, NSS 23, WNP-1 1 Some of these cabinets were targeted '?or use in safety related systems so the potential for a safety concern existed.

BCCo processed a 10 CFR 21 evaluation of this concern and reached the conclusion that the concern was not reportable because the cabinets targeted for use in B&W designed nuclear plants were in theirplantandundertheircontro.{- However, since this manufacturer 8306300159 830623 (fl4 'f PDR ADOCK 05000438 O S PDR \

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Q Babcock &WilCOX i

Mr. R. C. DeYoung June 23, 1983 e ifas cited for defective welds in your Information Notice 82-34, August 20, 1982, and neither of the above plants were listed as locations which may have received defective cabinets, B&W decided to advise you of this concern at these two B&W plant locations.

The fact that these two plants were not mentioned in IEN 82-34 was only recently brought to our attention.

BCCo has advised us that they have strengthened all of the '

cabinets concerned by seam and edge welding or bolting or a '

ccmbination of the two. A worst case single bay cabinet, strength-ened by a combination of welding and bolting, was seismically tested to demonstrate the strength required by the analysis is present.

If you have any questions concerning this matter please contact me (804 ) 385-2187, or Mr. R. D. McMahon of Bailey Controls Co.,

Wickliffe, Ohio on (216) 585-5800, or T. L. Baldwin, on (804)385-3142 of my staff.

Ver uly urs, 62ft

. H. Taylo , Manager Licensing Services JHT/fw cc: Mr. R. D. McMahon - BCCo Mr. R. B. Borsum - Bethesda Office 4 ---w __ ___ ,, ,,, -

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