ML20210A125
| ML20210A125 | |
| Person / Time | |
|---|---|
| Site: | Bellefonte  |
| Issue date: | 10/10/1985 |
| From: | Hufham J TENNESSEE VALLEY AUTHORITY |
| To: | Grace J NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| References | |
| NCR-BLN-4156, NUDOCS 8511140229 | |
| Download: ML20210A125 (2) | |
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TENNESSEE VALLEY AUTHORITY
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CHATTANOOGA TENNESSEE 37401 400 Chestnut Street Tower II 98f I ' l 5 Octo r BLRD-50-438/85-17 BLED-50-439/85-17 U.S. Nuclear Regulatory Commission Region II Attn:.Dr. J. Nelson Grace, Regional Administrator 101 Marietta Street, NW, Suite 2900
. Atlanta, Georgia 30323
Dear Dr. Grace:
- BELLEFONTE NUCLEAR PLANT UNITS 1 AND 2 - INADFQUATE CONCRETE COVER FOR GROUTED ANCHOR INSTALLATIONS - BLRD-50-438/85-17, BLRD-50-439/85 FINAL REPORT The subject deficiency was initially reported to NRC-OIE Inspector Al Ignatonis on May 20, 1985 in accordance with 10 CFR 50.55(e) as NCR 4156.
This'was followed by our first. interim report dated June 13, 1985. Enclosed is our final report which concludes that we no longer consider the requirements of 10 CFR 50.55(e) applicable.
If you have any questions, please get in touch with R. H. Shell at FTS 858-2688.
Very truly yours, TENNESSEE VALLEY AUTHORITY r N.
U. W. Hufham, Man Licensing and Risk Protection Enclosure cc:
Mr. James Taylor, Director (Enclosure)
Office of Inspection and Enforcement U.S. Nuclear Regulatory Connaission Washington, D.C.
20555 Records Center (Enclosure)
Institute of Nuclear Power Operations 1100 circle 75 Parkway, Suite 1500 Atlanta, Georgia 30339 1
8511140229 851010 PDR ADOCK 05000438 S
)\\
An Equal Opportunity Employer g
4 ENCLOSURE
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BELLEFONTE NUCLEAR PLANT UNITS 1 AND 2 INADEQUATE CONCRETE COVER FOR GROUTED ANCHOR INSTALLATIONS BLRD-50-438/85-17 AND BLRD-50-439/85-17 NCR BLE 4156 10 CFR 50.55(e)
FINAL REPORT Description of Deficiency Some seismic pipe supports have been installed with anchor bolts in i
violation of General Construction Specification G-32 [ implemented onsite by Bellefonte Nuclear Plant (BLN) Quality Control Procer'.ure (QCP) 2.8].
Appendix D of G-32 requires that in large holes or chipped out areas where grouted anchors are used, the clear distance of the existing concrete behind the anchor bolthead is at least three nominal bolt diameters for individual anchors and six nominal bolt diameters for multiple anchors.
In some instances, grouted anchors have been installed in holes chipped through a wall or floor slab without providing the required three or six bolt diameters of concrete cover beyond (behind) the embedded end of the anchor bolts.
Safety Implications A complete documentation review of grouted anchors installed in large holes or chipped out areas was performed by the Office of Construction (OC). As a result of this review, the three seismic pipe support anchorages listed below were found to be in violation of G-32, Appendix D clear _ distance requirements:
OVF-MPHG-0228 ISV-MPHG-1048 2SV-MPHG-2048 Support OVF-MPHG-0228 was reviewed for adequacy and found acceptable for the loading conditions. The other two support anchorages were tested by preloading to 90 percent of their minimum specified yield capacity.
No slippage of the anchorages was observed; and, therefore, no additional corrective action is required. Since this condition could not have adversely affected the safe operation of the plant, TVA no longer considers the requirements of 10 CFR 50.55(e) applicable.
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