ML20066H588
| ML20066H588 | |
| Person / Time | |
|---|---|
| Site: | Bellefonte  |
| Issue date: | 11/16/1982 |
| From: | Mills L TENNESSEE VALLEY AUTHORITY |
| To: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| References | |
| REF-PT21-82 10CFR-050.55E, 10CFR-50.55E, NUDOCS 8211230308 | |
| Download: ML20066H588 (2) | |
Text
a TENNESSEE VALLEY AUTHORITY CH ATTANOOG A. TENNESSEE 37401 y
400 Chestnut Street Tower II J
IW November 16, 1982 2
r ol8 U.S. Nuclear Regulatory Commission Region II Attn:
Mr. James P. O'Reilly, Regional Administrator g#
101 Marietta Street, Suite 3100 Atlanta, Georgia 30303
Dear Mr. O'Reilly:
BELLEFONTE NUCLEAR PLANT UNITS 1 AND 2 - BABCOCK & WILCOX'S NONCONSERVATIVE ANALYSIS OF NEUTRON FLUX - NCR BLN NEB 8007 - SEVENTH INTERIM REPORT On November 5,1980, 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 3, 1980, March 30 and September 21, 1981, and February 22, April 27, and August 10, 1982. Enclosed is our seventh interim report.
We consider 10 CFR Part 21 to be applicable to this deficiency. We expect to submit our next report by May 23, 1983 If you have any questions concerning this matter, please Set in touch with R. H. Shell at FTS 858-2688.
Very truly yours, TENNESSEE VALLEY AUTHORITY L.
. Mi Is, Ilanager Nuclear Licensing l
Enclosure cc:
Mr. Richard C. DeYoung, Director (Enclosure)
Office of Inspection and Enforcement i
U.S. Nuclear Regulatory Commission Washington, D.C.
20555 I
Mr. James McFarland (Enclosure)
Senior Project Manager Babcock & Wilcox Company P.O. Box 1260
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Lynchburg, Virginia 24505 l
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l 8211230308 821116 PDR ADOCK 05000438 S
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An Equal Opportumty Employer
O ENCLOSURE j
BELLEFONTE NUCLEAR PLANT UNITS 1 AND 2 BABC0CK AND WILCOX'S (B&W) NONCONSERVATIVE ANALfSIS OF NEUTRON FLUX NCR BLN NEB 8007 10 CFR 50.55(e)
SEVENTH INTERIM REPCRT Description of Deficien7y B&W's measurement errors assumed in determining Reactor Protection System (RPS) setpoints may be nonconservative under specific plant conditions. These. errors may allow operation outside the established safety limits in certain design basis events.
The events of concern are: small overcooling and small steam line break; large steam line break in containment; and the rod ejection accident.
Interim Progress TVA has directed B&W to proceed with their software solution analysis of the neutron flux problem via TVA letter PA-1144 dated July 21, 1982. TVA has also requested B&W to provide a sensitivity study which will quantify any impacts on plant operability because of the results of their analysis.
Once the analysis is complete, B&W will submit a report to TVA for review and approval. This is expected to be completed by April 1, 1983 TVA will provide more information in the next report.
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