ML20133P863
| ML20133P863 | |
| Person / Time | |
|---|---|
| Site: | Bellefonte  |
| Issue date: | 06/26/1985 |
| From: | Hufham J TENNESSEE VALLEY AUTHORITY |
| To: | Grace J NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| References | |
| REF-PT21-85, REF-PT21-85-342-000 PT21-85-342, PT21-85-342-000, NUDOCS 8508140509 | |
| Download: ML20133P863 (2) | |
Text
F TENNESSEE VALLEY AUTHORITY CH ATTANOOG A. T EN N ESS CE 3 7 401 400 Chestnut Street Tower II Jqng26,'01985;.,07
'o 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 - ATTACHED PIPING POTENTIAL SAFETY CONCERN - NCR BLN NEB 8008 - ELEVENTH INTERIM REPORT On November 21, 1980, R. W. Wright, NRC-0IE Region II, was informed that the subject nonconformance was determined to be reportable in accordance with 10 CFR 50.55(e). This was followed by our interim reports dated December 19,1980; April 2 and July 17, 1981; February 17, June 22, and October 14, 1982; May 23 and November 17, 1983; and January 5 and July 6, 1984. Enclosed is our eleventh interim report. We consider 10 CFR Part 21 to be applicable to this nonconformance. We expect to submit our next report on or about December 29, 1986.
If you have any ques'. ions concerning this matter, please get in touch with R. H. Shell at FTS 858-2688.
Very truly yours, TENNESSEE VALLEY AUTHORITY
~
J. W. Hufham, Manager Licensing and Risk Protection Enclosure cc (Enclosure):
Mr. James Taylor, Director Office of Inspection and Enforcement U.S. Nuclear Regulatory Commission Washington, D.C.
20555 H. B. Barkley, Manager 205 Plant Project Services P.O. Box 10935 Lynchburg, Virginia 24506-0935 Records Center Institute of Nuclear Power Operations 1100 Circle 75 Parkway, Suite 1500 Atlanta, Georgia 30339 8508140509 850626 g
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ENCLOSURE BELLEFONTE NUCLEAR PLANT UNITS 1 AND 2 ATTACHED PIPING POTENTIAL SAFETY CONCERN NCR BLN NEB 8008 10 CFR 50.55(e)
ELEVENTH INTERIM REPORT Description of Deficiency Babcock and Wilcox (B&W), Lynchburg, Virginia, has uncovered an inconsistency between the assumptions relative to pipe breaks in the loss of, coolant accident (LOCA) analysis and the structural analysis of certain connecting pipes in the affected or broken loop. The LOCA analysis did not assume a consequential failure of piping caused by a LOCA pipe break.
Certain piping and instrumentation connections to the reactor coolant system (RCS) might not have been adequately designed to maintain function or to resist consequential failures as a result of the LOCA break in the RCS, Consequential failures of these piping connections could present an inconsistency with the emergency core coolig system (ECCS) analysis performed for Bellefonte Nuclear Plant-(BLN).
Interim Progress As specified in previous interim reports, the completed analyses show that the stress levels in all piping and instrumentation connections to the RCS are acceptable except for the incore piping.
Interim report No.10 dated July 6,1984 indicated that the subject nonconformance report (NCR) will be resolved by making use of the " leak before break" (LBB) criterion. The LBB criterion will eliminate primary piping breaks and thereby eliminate the load component causing the incore piping to be overstressed.
Once the NRC has approved application of the LBB criterion to primary piping at plants with B&W NSSS, B&W is to confirm that the LBB criterion does in fact resolve the incore piping overstress problem. B&W has submitted its LBB evaluation report for the primary piping (BAW-1847) to the NRC. The NRC provided comments on BAW-1847 on March 12, 1985.
J. F. Walter's (B&W Project Manager for Owners Group Engineering Services) letter to G. S. Vissing (NRC Project Manager for B&W Owners Group) dated April 25, 1985, responded to the NRC's comments.
B&W estimates that the NRC will complete its review of BAW-1847 by July 1986.
We expect to receive B&W's confirmation that the LBB criterion resolves BLN NEB 8008 by September 30, 1986.
TVA will submit the next report upon resolution of the comments arising from the application of LBB to BLN. The submittal is expected to be on or about December 29, 1986.
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