TXX-4415, Significant Deficiency Rept SDAR-163 Re Thread Engagement of Bolts for Steam Generator Upper Lateral Support Beams.Bolts Will Be Replaced to Conform to Design Requirements

Significant Deficiency Rept SDAR-163 Re Thread Engagement of Bolts for Steam Generator Upper Lateral Support Beams.Bolts Will Be Replaced to Conform to Design Requirements

ML20107H837
Person / Time
Site:	Comanche Peak
Issue date:	02/14/1985
From:	Clements B TEXAS UTILITIES ELECTRIC CO. (TU ELECTRIC)
To:	Hunter D NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
References
CP-85-03, CP-85-3, SDAR-163, TXX-4415, NUDOCS 8502270288
Download: ML20107H837 (2)

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TEXAS UTILITIES GENERATING COMPANY MKYWAY TOWEN . 400 NOHTH Hl.IVE MTHEET,I,.it. MI

• 83AI.E.AM. TEXAM 73201

m. ".SI "S"L".!L. February 14, 1985 TXX-4415 I

l Mr. D.R. Hunter, Chief Reactor Project Branch 2 U.S. Nuclear Regulatory Commission Office of Inspection & Enforcement 611 Ryan Plaza Drive, Suite 1000 Docket No.: 50-445 Arlington, TX 76012 COMANCHE PEAK STEAM ELECTRIC STATION THREAD ENGAGEMENT OF BOLTS FOR UNIT 1 STEAM GENERATOR UFPER LATERAL SUPPORT BEAMS QA FILE: CP-85-03, SDAR-163 l FILE N0.: 10110 1

Dear Mr. Hunter:

In accordance with 10CFR50.55(e), we are submitting the enclosed report of actions taken to correct a deficiency regarding anchor bolts in steam generator upper lateral supports that were found to have less than the 21/4 engagement as required by the design drawings.

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

Very truly yours, BRC:tig Attachment cc: NRC Region IV - (0 + 1 copy) @ @ @ OM $_

Director, Inspection & Enforcement (15 copies)

U.S. Nuclear Regulatory Commissior. FEB 19 E ,;

Washington, DC 20555 g. '

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o 45 PDR IE 47

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'TXX-4415 2/14/85 ATTACHMENT THREAD ENGAGEMENT OF BOLTS FOR UNIT 1 STEAM GENERATOR UPPER LATERAL SUPPORT BEAMS Description During investigation by the NRC-TRT of an allegation regarding the unauthorized shortening of anchor bolts, installation and inspection records were requested for the Unit 1 steam generator upper lateral support beams from the records vault. Upon failing to locate the records, a site nonconformance report was issued. The disposition of the non-conformance specified inspection including ultrasonic measurement of the anchor bolt lengths.

The results of the ultrasonic testing indicate insufficient thread engagement to provide adequate design bolt engagement into the embedded plate. Evaluation of the as-constructed data by the A/E has concluded the structures do not meet design requirements without replacement of the bolts to design engagement.

Safety Implications In the event the condition had remained undetected, failure of the beams could adversely affect safety-related systems, components, and operator actions under accident conditions.

Corrective Actions Anchor bolts for the upper lateral support beams will be replaced to conform with design requirements. Construction and installation activities are scheduled to begin in early February, 1985, and will be performed in accord-ance with established project procedures.

Our response to Technical Review Team (TRT) issue V.b will address the generic implications and root cause for this deficiency.