ML20009D068
| ML20009D068 | |
| Person / Time | |
|---|---|
| Site: | South Texas  |
| Issue date: | 07/17/1981 |
| From: | Rice W BROWN & ROOT, INC. (SUBS. OF HALLIBURTON CO.) |
| To: | Stello V NRC OFFICE OF INSPECTION & ENFORCEMENT (IE) |
| References | |
| REF-PT21-81-476-000 PT21-81-476, PT21-81-476-000, NUDOCS 8107230086 | |
| Download: ML20009D068 (2) | |
Text
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[k Mr. Victor Stello, Director Office of Inspection and Enforcement
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Dear Mr. Stello:
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. Based on an extensive testing program conducted at the South Teias Project (STP) to verify the ultimate capacities of wedge-type expansion anchors, a concern was identified that these anchors may not develop ultimate capaci-ties consistent witn the manufacturer's published values when installed in grout. This concern was presented to the Nuclear Regulatory Cc:sission (NRC) in our letter of June 1,1981, submitted pursuant to 10CFR21. The expansion anchors involved are supplied by Hilti Industries, Inc. of Tulsa, Oklahoma.
Preliminary analysis of test data for expansion anchors in grout indicates that ultimate tensile capacities for these anchors should be reduced by approximately 20% from the capacity of :the anchors when installed in concrete.
Shear. values in grout are more consistent with those published by the manu-facturer than are the tensile values. Some tested expansion anchors did experience shear failure at load values slightly lower than those in the manufacturer's tables. The test data indicate that a deeper embedment in grout may provide the capacity of a lesser e6edment in concrete. Further analysis is required to establish a more definitive relationship between grout versus concrete installation.
Details regarding test results for anchor bolts inctalled in concrete are contained in Houston Lighting & Power Compar.y's letter of June 10, 1981, ST-HL-AE-682, submitted to your Region IV office pursuant to 10CFR50.55(e).
To date, Brown & Root, Inc. has~ noti identified a safety hazard at STP relative to expansion anchor bolt installation in grout. As previously stated, due to the complexity of the concern, additional study of the test results and evaluation of specific application are required. This effort will extend beyond the near term. We shall provide the status of our activities by September 4,1981.
Yours very truly, BROWN & ROOT, INC.
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Group Vice President
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Karl V. Seyfrit, Director Office of Inspection and Enforcement'- Region'IV-U. S.: Nuclear Regulatory Commission a
611 Ryan Plaza Drive,' Suite 1000
' Arlington,: Texas 76102 D. G. Barker, Manager
- South Texas Project Electric Generating Station Houston Lighting &' Power Company P. O.-Box 1700 Houston, Texas 77001-D.:F. Fox, Contractor Inspector.-
-Program Evaluation Section - Vendor Inspection Branch 10ffice.of Inspection and Enforcement - Region IV 611.Ryan Plaza ' Drive Suite 1000
' Arlington, Texas 76102
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Herbert L.' Henkel, Director - Technical Services Hilti. Inc.
P. 0.' Box 45400 Tulsa, Oklahoma 74145
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