ML19338G036

Interim Deficiency Rept Re Defects in Installation of Hilti- Kwik Concrete Anchor Bolts.Identified Anchor Bolts Have Been Removed.Support Will Be Reworked &/Or Relocated to Meet Required Design Criteria.Followup Rept Provided by 810123

ML19338G036
Person / Time
Site:	Comanche Peak
Issue date:	10/21/1980
From:	Gary R TEXAS UTILITIES ELECTRIC CO. (TU ELECTRIC)
To:	Seidle W NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
References
10CFR-050.55E, 10CFR-50.55E, TXX-3223, NUDOCS 8010280354
Download: ML19338G036 (3)

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TEXAS UTILITIES GENERATING CO.TIInNY 2003 HRYAN MWER . DALLA *ATEJCAS 75201 R. J. GARY October 21, 1980

"::::::.'.":'".:::' TXX-3223 Mr. W. C. Seidie, Chief Reactor Construction & Engineering Support Branch U. S. Nuclear Regulatory Commission i Office of Inspection & Enforcement 611 Ryan Plaza Dr., Suite 1000 Docket Nos. 50-445 Arlington, Texas 76012 50-446 1

COMANCHE PEAK STEAM ELECTRIC STATION HILTI-KWIK CONCRETE ANCHOR BOLTS FILE N0: 10110

Dear Mr. Seidle:

In accordance with 10 CFR 50.55(e) we are submitting the attached interim report concerning deficiencies in the installation of Hilti-Kwik concrete

. anchor bolts. We previously reported this item verbally to your Mr. R. G.

i Taylor on October 1, 1980. We anticipate submitting a follow-up report j on the planned investigations by January 23, 1981.

If we can provide any additional infonnation, please advise. '

Very truly yours, R. . Gary RJG:dk Attachment cc: NRC Region IV - (0 + 1 copy)

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

U. 3. Nuclear Regulatory Commission Washington, D. C. 20555 l

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8010280 3N

r o TXX-3223 Attachment October 21, 1980 HILTI-KWIK CONCRETE ANCHOR BOLTS Description of Deficiency As a result of an allegation to Construction management, Ultrasonic Tetting (UT) of a number of Hilti-Kwik concrete anchor bolts was accomplished to 1

verify that the installed lengths were consistent with a code letter designation on the end of the bolt and in compliance with design require-ments. Two of approximately 50 anchor bolts examined were indicated by UT as being shorter than required. Both anchor bolts were associated with a single conduit support in the Unit 1 Cable Spread Room. One anchor bolt, which was removed by jacking, was found to have been field modified in an unauthorized manner to shorten the anchor bolt by cutting the mandrel and grinding a new mandrel into the shorter shaft. The second anchor bolt was checked for torque prior to removal by jacking, and the required torque value could not be obtained. This second anchor bolt had been modified in a manner similar to the first.

Analysis of Safety Implications After evaluating the previously described Hilti-Kwik anchor bolts, it has been determined that due to the unauthorized and uncontrolled modification of these items sufficient data is not available to determine their structural capabilities. Therefore, it has been concluded that this deficiency could have adversely affected safe plant operation due to the conduit supports' inability to sustain the design loading conditions.

4 Corrective Actions The following actions have been or will be taken to correct this deficiency and to ascertain whether additienal problems exist with these items:

A. The identified Hilti-Kwik anchor bolts have been removed. The support will be reworked and/or relocated to meet the required desigr, criteria.

B. To evaluate the extent of the identified deficiency, a detailed program of ultrasonic testing is planned.

The initial phase will include a sampling program of Hilti-Kwik anchor bolts it. stalled by functional craft disciplines and subcontractors (e.g., mechanical, electrical, instrumentation, HVAC, etc.). The results of these examinations will be used to determine any future actions required to provide assurance of the  !

integrity of installed expansion anchors. l l

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TXX-3223 October 21, 1980 The test program is currently under development, and implementing instructions are being prepared.

We anticipate beginning the evaluation on or before November 3,1980. with scheduled completion by December 31, 1980.

' C. _It has been emphasized to craft personnel by

! Construction management that any unauthorized modification or alteration to permanent plant components will result in disciplinary action.

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