ML20031D989
| ML20031D989 | |
| Person / Time | |
|---|---|
| Site: | Bellefonte  |
| Issue date: | 10/06/1981 |
| From: | Mills L TENNESSEE VALLEY AUTHORITY |
| To: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| References | |
| 10CFR-050.55E, 10CFR-50.55E, NUDOCS 8110140434 | |
| Download: ML20031D989 (2) | |
Text
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TENNESSEE VALLEY AUTHORITY CHATTANOOG A. TE NNESSEE 37401 400 Chestnut Street Tower II 5i October 6, 1981 k
BLRD-50-438/81-50
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BLRD 50-439/81-52 W
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Mr. Jame.s P. O'Reilly, Director DC b 8 Jgg
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7 Office of Inrpectica and Enfcrcement
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- U.S. Nuclear Regul4tcry Commission Region II - Suite '3100 101.Marietta Street. -
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Dear Mr.IC'Reilly:
s BELLEFONTE NUCLEAR PL4NT UNITS 1 AND 2 - MAIN STEAM VALVE ROOM A PIPE ANCHOR SUPPORT LOADS - 1LhD-50-438/81-50, BLRD-50-439/81 SECOND INTERIM RE? ORT i
The subject deficiency was initially reported to NRC-0IE Inspector R. V. Crlen,9k oa July 23, 1981 in accordaace with 10 CFR 50.55(e) as NCR BLN BLP 8120.s This was followed by our first interim report dated August-18, 1981. Enclosed is our second interim report. We expect to submit car resIt, report by November 18, 1981.
If. you have any questions concerning this c:atter, please get in touch with D. L. La%ert
3 857-2581.
Very truly yours, TENNESSEE VALLEY AUTHORITY s
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s L. M. Mills, Manager Nuclear Regulation and Safety
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Enclosure cc:
P.r. Victor Stello, Jr., Director (Enclosure)
Office of Inspestion and Enforcement U.S. Nuclear 'iegulatory Commission fiashington, DC 20555
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8110140434 811006 PDR ADOCK 05000438 S
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ENCLOSURE BELLEFONTE NUCLEAR PLANT UNITS 1 AND 2 MAIN STEAM VA.7E ROOM A PIPE ANCHOR Si,' PORT LOADS BLRD-50. 438/81-50, BLRD-50-439/81-52 10 CFR 50.55(e) 1 SECCND INTERIM REPORT Description of Condition Two main steam pipe anchors and one feedwater pips anchor (six-way restraints) per unit are attached to the R-line wall in the A main steam valve rooms. The original design of the R-line wall and roof slabs was accomplished utilizing preliminary loads and preliminary anchor design concepts. The anchor design sus completed and the actual anchor embedment loads determined.. The actual loads were significantly higher than the
preliminary desiger loadis,."biti the'R-linel well and roof lalatis.were"noth ""' ').f. '.4j. /fffh reevaluated.
Interim Progress A detailed finite element analysis was performed on the exist.ing wall and roof slabs. Although the strengthening effect of adjacent walls and slabs was considered, the loads in the all still exceeded the ACI Code allowable loads. Desig work is in progress to strengthen the wall with a series of concrete stiffening elements.
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