TXX-6552, Interim Deficiency Rept CP-86-51 Re Anchor Bolts Supplied by Hilti Corp.Initially Reported on 860717.Current Evaluation Indicates That half-inch Diameter Bolts Unacceptable for Average Ultimate Tensile Loads.Next Rept Expected by 871021
| ML20235H793 | |
| Person / Time | |
|---|---|
| Site: | Comanche Peak  |
| Issue date: | 07/08/1987 |
| From: | Counsil W, Keeley G TEXAS UTILITIES ELECTRIC CO. (TU ELECTRIC) |
| To: | NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM) |
| References | |
| CP-86-51, TXX-6552, NUDOCS 8707150266 | |
| Download: ML20235H793 (1) | |
Text
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M Log # TXX-6552' FE File # 10110 l
903.9 r
=
Ref # 10CFR50.55(e)'
MIELECTRIC July 8,1987 -
wmi
- c. coun.ii Ewouve %ce Presitkut U. S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, D.C.
20555 i
SUBJECT:
COMANCHE PEAK STEAM ELECTRIC STATION (CPSES)
DOCKET NOS. 50-445 AND 50-446 ANCHOR BOLTS SUPPLIED BY HILTI SDAR: CP-86-51 (INTERIM REPORT) l Gentlemen:
On July 17, 1986, we verbally notified your. Mr. I. Barnes of a deficiency-i involving a condition cited at another nuclear facility in which anchor bolts supplied by Hilti do not meet average ultimate tensile loads in certain sizes as published by the supplier. Our latest interim report, logged TXX-6405, was -
submitted on April 24, 1987.
Our current evaluation of this issue has considered the revised allowable
-loads and those used in the design with associated safety factors. This comparison indicates 1/2" diameter bolts in specific are not acceptable when acknowledging published average ultimate tensile loads.
In order to assure the adequacy of these bolts, testing of the 1/2" diameter anchor bolts will be performed in CPSES concrete to determine the ultimate capacity.
A procedure is being developed for the testing activity to be performed. This procedure is currently scheduled for completion by late September,1987.
l Our next report on this issue will be submitted no later than October 21, j
1987.
]
Very truly yours, H&ndb W. G. C unsil e707150266 070708 j
ADOCK0500g5 DR G. S. Keeley Manager, Nuclear 1 >nang GLB/mgt c - R. D. Martin, Region IV Resident Inspectors, CPSES (3) g7
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a norm oti.r surer a si w a. re w m os
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