ML20042A460
| ML20042A460 | |
| Person / Time | |
|---|---|
| Site: | Bellefonte  |
| Issue date: | 03/11/1982 |
| 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 8203230454 | |
| Download: ML20042A460 (2) | |
Text
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N TENNESSEE VALLEY AUTHORITY
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,7 CH ATTANOOGA TENNESSEE 37401 W
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400 Chestnut Street Tower II
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2 March 11, 1982 ca
,y BLRD-50-438/81-50
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BLRD-50-439/81-52
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BLRD-50-438/82-16 ef BLRD-50-439/81-23 q,
USCppjED G
U.S. Nuclear Regulatory Commission M4Rgg 02am2
-3 Region II I
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Mr. James P. O'Reilly, Regional Administrator 101 Marietta Street, Suite 3100
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d Atlanta, Georgia 30303 g
Dear Mr. O'Reilly:
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BELLEFONTE NUCLEAR PLANT UNITS 1 AND 2 - LACK OF REBAR AT MAIN STEAM FLUED HEAD AND MAIN STEAM VALVE ROOM A PIPE ANCHOR SUPPORT LOADS - FIFTH INTERIM REPORT The lack of rebar was initially reported to NRC-0IE Inspector J. Celenjak on February 27, 1981 in accordance with 10 CFR 50.55(e) as NCR 1390. This was followed by our interim reports dated March 31, June 3, August 31, and November 20, 1981. The related deficiency on pipe anchor support loads also was determined to be reportable in accordance with 10 CFR 50.55(e) and was reported to R. V. Crlenjak on July 23, 1981 as NCR BLN BLP 8120.
This was followed by interim reports dated August 18, October 6, and November 13, 1981 and February 9, 1982. Enclosed is our combined fifth interim report. As discussed with R. V. Celenjak by telephone on February 22, 1982, this response was delayed. We expect to submit our next report by April 22, 1982.
If you have any questions concerning this matter, please get in touch with R. H. Shell at FTS 858-2688.
Very truly yours, TENNESSEE VALLEY AUTHORITY E
. Milis, nager Nuclear Regulation and Safety Enclosure cc:
Mr. Richard C. DeYoung, Director (Enclosure)
Office of Inspection and Enforcement U.S. Nuclear Regulatory Commission Washington, DC 20555 x-82032g454g2ggg
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DR A CK 0
PDR An Equal Opportumty Employer I
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ENCLOSURE BELLEFONTE NUCLEAR PLANT UNITS 1 AND 2 LACK OF REBAR AT MAIN STEAM FLUED HEAD AND MAIN STEAM VALVE ROOM A PIPE ANCHOR SUPPORT LOADS 10 CFR 50.55(e)
FIFTH INTERIM REPORT Description of Deficiency The lack of rebar dccumented by NCR 1390 (BLRD-50-438/82-16, BLRD-50-439/81-
- 23) was discovered while chipping concrete, in accordance with disposition of NCR 1308, to determine the locations of steel reinforcing bars at main steam flued head supports. Chipping revealed that these bars are not present between said supports. Additionally, it was discovered that reinforcing bars which should lace between the anchor plate support bars were cut off below the supporta. After chipping further, it was found that the reinforcing described above is missing for all anchors in valve room A for both units 1 and 2.
Upon reviewing the design, NCR BLN BLP 8120 (BLRD-50-438/81-50, BLRD 439/81-52) was written against the design calculations. Two main steam pipe anchors and one feedwater pipe anchor (6-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 slab was accomplished utilizing preliminary loads and preliminary anchor design concepts. The anchor design was completed and the actual anchor embedment loads determined.
Although the actual loads were significantly higher than the preliminary design loads, the R-line wall and roof slabs were not reevaluated.
Interim Progress
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Concrete stiffening walls have been designed and released to TVA's Division of Conatruction to increase the capacity of the 9-Line wall in the vicinity of the unit 1 and 2 center main steam pipe anchors. These stiffening walls, in conjunction with the existing R-line wall and remaining reinforcing, provide sufficient capacity to resist the applied anchor loads. The walls at the corner main steam and feedwater anchors were determined to be acceptable as is.
The adjacent walls and slabs, acting togwV ar witn the existing R-line wall and remaining reinforcing, provide adequate capacity to resist the applied anchor loads at the corners. To prevent recurrence, the inspectors shall report inscallation conflicts between embedments and rebars to the engineer for coordinated modifications with the design project organization. The modifications will be completed by September 1, 1983, for unit 1 and September 1, 1984, for unit 2.
Additional actions to prevent recurrence will be addressed in our final rep 4 as t
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