TXX-3657, Interim Deficiency Rept Re Welding of Brackets on vendor- Supplied Valves & Quality of bracket-to-actuator Barrel. Initially Reported on 830324.Brackets & Welds Will Be Replaced

Interim Deficiency Rept Re Welding of Brackets on vendor- Supplied Valves & Quality of bracket-to-actuator Barrel. Initially Reported on 830324.Brackets & Welds Will Be Replaced

ML20069K468
Person / Time
Site:	Comanche Peak
Issue date:	04/21/1983
From:	Gary R TEXAS UTILITIES ELECTRIC CO. (TU ELECTRIC)
To:	Madsen G NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
References
CON-TXX-3657 10CFR-050.55E, 10CFR-50.55E, 10CFR-50.55E4, CP-83-08, CP-83-8, TXX-3657, NUDOCS 8304260362
Download: ML20069K468 (2)

Text

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TENAS UTILITIES GENERATING COMPANY 2tMal ItttYAN TV)WEl411stJ ANTENAM 7:Wol4 M 8:'d)

R. J. GARY "O!'J"??CT!s' April 21, 1983 TXX 3657 -

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Mr. G. L. Madsen, Chief

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U. S. Nuclear Regulatory Connission Office of Inspection and Enforcement _

611 Ryan Plata Drive, Suite 1000 Docket Nos. 50-445 Arlington, TX 76012 50-446 COMANCHE PEAK STEAM ELECTRIC STATION CONTROL VALVE BRACKETS FILE N0. 10110 QA FILE: SDAR 108; CP-83-08

Dear Mr. Madsen:

In accordance with 10 CFR 50.55(e), we are submitting the attached report of actions taken to correct a deficiency regarding the welding of brackets on vendor supplied valves. We had previously informed your Mr. R. G. Taylor of the deficiency on March 24, 1983.

Support documentation is available at the CPSES site for your Inspector's review.

Very truly yours, va R. J. Gary RJG:lj p Attachment cc: E C Region IV - (0 + 1 copy)

Director, Inspection and Enforcement - (15 copies) c/o Distribution Services Branch, DDC, ADM.

U. S. Nuclear Regulatory Connission Washington, DC 20555 8304260362 830421 PDR ADOCK 05000445 g PDR

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.TXX-3657 April 21, 1983 ATTACHMENT

, CONTROL VALVE BRACKETS Description of Deficiency

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TUSI Engineering has evaluated the subject deficiency and -idsntified two -

items. The first. item deals with.the issue of the code boundary of the

-brackets welded toithe valve operators.- By definition the valve operators are considered an intervening element in the component support load path.

The- brackets are an integral part of'the valve operator supplied by. the valve vendor. As such, the NF jurisdictional boundary is the mechanical pin

-connection to the snubber. The bracket or weld is not considered NF-in this Case.

The second item deals with the quality of the bracket-to-actuator barrel wel d. The code requires that load path be transferred without loss of component pressure boundary integrity. From a design perspective, the brackets are acceptable based upon vendor submitted and approved analytical seismic analyses and generic " shaker table" mechanical testing. These documents are available for review in the Permanent Plant Records Vault.

However',- from a product perspective, no objective evidence is available docunenting acceptable weld quality. The integrity of the welds cannot be assured during a seismic event.

Safety Analyses In the event the deficiency had not been detected, failure of the bracket welds during a seismic event could result in an unpostulated line break rendering certain class 2 safeguards ' actuation systems unavailable.

Corrective Actions The brackets and welds for valves identified per the site nonconformance report will be discarded and replaced. Note: With the work ' completed in-accordance with the project ASME QA program, the weld and brackets will no longer be considered " intervening elements" outside the' NF boundary.

Corrective actions will proceed immediately.

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