TXX-6373, Supplemental Deficiency Rept CP-80-10 Re Deficiencies from Unauthorized Field Mod of Hilti-Kwik Concrete Anchor Bolts. Five Nonconforming Bolts Identified in NCR-E-81-00001 Corrected by Removing Bolt or Abandoning & Grouting

Supplemental Deficiency Rept CP-80-10 Re Deficiencies from Unauthorized Field Mod of Hilti-Kwik Concrete Anchor Bolts. Five Nonconforming Bolts Identified in NCR-E-81-00001 Corrected by Removing Bolt or Abandoning & Grouting

ML20235V758
Person / Time
Site:	Comanche Peak
Issue date:	07/15/1987
From:	Counsil W, Keeley G TEXAS UTILITIES ELECTRIC CO. (TU ELECTRIC)
To:	NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM)
References
CP-80-10, TXX-6373, NUDOCS 8707230295
Download: ML20235V758 (2)

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Log # TXX-6373

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= = Ref # 10CFR50.55(e) 1UELECTRIC William G. Counsil Etxutive %ee Preudent U. S. Nuclear Regulatory Commission Attn: Document Control Desk Washington, D.C. 20555

SUBJECT:

COMANCHE PEAK STEAM ELECTRIC STATION (CPSES)

DOCKET NOS. 50-445 AND 50-446 HILTI-KWIK CONCRETE ANCHOR BOLTS SDAR: CP-80-10 (SUPPLEMENTAL REPORT)

Gentlemen:

The subject issue addresses deficiencies resulting from unauthorized field modification of Hilti-Kwik Concrete Anchor Bolts. Specifically, this issue described modifications to Hilti bolts in which the length of the bolts was reduced by crafts cutting off the mandrel portion of the Hilti-Kwik bolt and grinding a new mandrel into the shortened shaft,. or crafts cutting off the bottom mandrel of a double-mandreled Super Hilti Kwik bolt.

This deficiency was deemed reportable pursuant to the provisions of 10CFR50.55(e) and our final report was submitted in TXX-3442, dated December 4, 1981. This supplemental report is submitted as a result of further investigation into this issue.

Corrective Action for the deficiency involved an extensive program of '

Ultrasonic Testing (UT). The results of this UT program were reported in our final report. Among those results, it was reported that of the 796 Hilti-Kwik ,

bolts examined in electrical installations, all were found to be acceptable l based upon not finding unauthorized mandrel cutting.

This letter clarifies those reported results in light of what appears to be I conflicting statements in supporting documents. Several of thase documents  !

stated that 796 bolts in electrical installations were tested by UT examination and 5 were found to be unacceptable. The corresponding Nonconformance Report (NCR-E-81-00001) stated that those 5 nonconforming j Hilti-Kwik bolts were unacceptable because they were shorter than indicated by l the bolt stamps. The QC Inspection Report that was used to close this NCR {

noted that the bolt stamps appeared to have been altered. These five bolts were apparently not identified in our final report because they were outside the scope of the deficiency identified in SDAR CP-80-10, which specifically ,

concerned cut mandrels. l The 5 nonconforming Hilti-Kwik bolts identified in NCR-E-81-00001 were corrected by either removing the bolts or abandoning them in-place by driving the bolt into the hole to a depth beneath the concrete surface and then i grouting the hole using an approved procedure. )

8707230295 870715 l PDR S

ADOCK 05000445 PDR p$[ p e

400 North Olive Sweet LB 81 Dallas, Texas 75201 l

TXX-6373 July 15,1987 Page 2 of 2 The' circumstances and actions taken for the 5 unacceptable bolts were  !

addressed in our response to unresolved item 50-445/8626-U-05; 50-446/8622-U- i 04 in accordance with the request in your letter dated April 2,1987 (see TXX-6472 dated Junc 5, 1987).

Our conclusions regarding SDAR: CP-80-10 concerning the issue of cutting and .

regrinding of mandreh on Hilti-Kwik concrete anchor bolts remain unchanged.  !

Very truly yours,  :

b/ V+

W. G. C unsil ,

By: -

G. S. Keeley -'

Manager,NuclearLiknsing JCH/mlh c - Mr. R. D. Martin,..egion IV Resident Inspectors, CPSES (3 copies) 1 i

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