ML20093M131
| ML20093M131 | |
| Person / Time | |
|---|---|
| Site: | Bellefonte  |
| Issue date: | 10/09/1984 |
| From: | Mills L TENNESSEE VALLEY AUTHORITY |
| To: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| References | |
| NUDOCS 8410190397 | |
| Download: ML20093M131 (2) | |
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TENNESSEE VALLEY AUTHORITY CHATTAN000A. TENNESSEE 37401 400 Ch nut Street Tower II
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J-BLRD-50-438/84-49 BLRD-50-439/84-45 U.S. Nuolear Regulatory Commission Region II Atta It. James P. O'Reilly, Regional' Administrator 101 Marietta Street, NW, Suite 2900 Atlanta, Georgia 30323
Dear Mr. O'Reilly:
BELLEFONTE NUCLEAR PLANT UNITS 1 AND 2 - 1*
.CT BOLT STRESS ALLONABLES USED IN FLANGE QUALIFICATION - BLRD-50-438/84-49 0 BLRD-50-439/84 FIRST IlfrERIM REPORT The subject deficiency was initially mported to NRC-0IE Inspootor '
P. E. Fredrickson on September 7,1984 in mocordance with 10 CFR 50.55(e) as NCR BLN CEB 8414. Enclosed is our first interim report. We expect to submit our next mport on or about July 31, 1985.
If you have any questions, please get in touch with R. H. Shell at FTS 858-2688.
Very truly yours, TENNESSEE VALLEY AUTHORITY L. M. Mills, Manager Nuolear Licensing Enclosum 00: Mr. Richard C. DeYoung, Director (Enclosure)
Office of Inspootion and Enforcement U.S. Nuclear Regulatory Commission
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Washington, D.C.
20555 Records Center (Enclosurg)
Institute of Nuoione Power Operations i
l 1100 circle 75 Parkway, Suite 1500 I
Atlanta, Georgia 30339 i
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ENCLOSURE gi'o...-
BELLEFONTE NUCLEAR PLANT UNITS 1 AND 2 INCORRECT BOLT STRESS ALLONABLES USED IN FLANGE QUALIFICt. TION BLRD-50-438/84-49, BLRD-50-439/84-45 10 CFR 50.55(e)
NCR BLN CEB 8414 FIRST INTERIM REPORT Descrintion of Deficiency i
Piping flanges analysed in problem N4-IKE-0 wem qualified using incorrect bolt I
The differences between the stress values used p The analysis the correct allowables.
allowables are significant and range as high as 10,000 lb/in.
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was based on pmlininary information which was not verified by subsequent controlling documentation. Although this problem presently conoems the Essential Raw Cooling Idater system, its applicability to other Bellefonte piping I
analysis problems.is not yet known.
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l Interim Proaress TVA is currently investigating bolt mlated documentation in addition to verification of flange bolt data. The possibilities for corrective action 1
include reanalysis of the problem (s) affected or installation of high-strength r
l bolts.
TVA will provide additional details in our next report.
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