ML20093J162
| ML20093J162 | |
| Person / Time | |
|---|---|
| Site: | Catawba  |
| Issue date: | 10/13/1995 |
| From: | Tuckman M DUKE POWER CO. |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| NUDOCS 9510230127 | |
| Download: ML20093J162 (3) | |
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x I-Duke 1%werCompany M S noata P.0 Bar1006 Senior Vice hesident Garlotte,NC2820M006 NuclearGeneration (106182-22000$ce (7003824360 Fat J
October 13,1995 U. S. Nuclear Regulatory Commission -
Washington, D. C. 20555 Attention: Document ControlDesk.
Subject:
Catawba Nuclear Station
- Docket Numbers 50-413 and -414 McGuire Nuclear Station Docket Numbers 50-369 and -370 Use of the BWU-Z Critical Heat Flux Correlation l
Duke met with NRC staff on August 15,1995 and discussed several options for obtaining NRC approval of newly-developed or applied methodologies by Duke; to reduce or eliminate the need for formal NRC review. Such approvals would be accomplished by Duke's notifying NRC of a proposed methodology, and then NRC's doing one of the following: (1) issuing a letter ofconcurrence with no further action, (2) requesting a Duke presentation, or (3) scheduling an audit at Duke. The NRC staff concurred with this approach and directed Duke to proceed. These methods of approval are similar to the recent NRC approvals for Duke use of TACO-3 (Reference 1: NRC letter from Herbert N. Berkow to M.S. Tuckman, Duke Power Company's Use Of TACO-3 And The Fuel Rod Gas Pressure Criterion For The Oconee, McGuire, and Catawba Nuclear Stations, April 3,1995) and CROV 9.0 (Reference 2: NRC letter from Herbert N. Berkow to M.S.
Tuckman, Duke Power Company Use Of CROV Computer Code, June 19,1995).
In keeping with the above agreement, Duke is notifying NRC ofits intent to begin using BWFC's BWU-Z critical heat flux (CHF) correlation (Reference 3: BAW-10199, The BWU Critical Heat Flux Correlations, BWFC, submitted November 1994) on Catawba 2 Cycle 9. BWU-Z is scheduled to be approved in December 1995. This correlation will be
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used in approved Duke methods (Reference 4: DPC-NE-2005P-A, Duke Power Company
- Thermal Hydraulic Statistical Core Design Methodology, February 1995). Transitioning i
to analyses for McGuire/ Catawba with Mark-BW fuel and BWU-Z will be another
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combination of separately approved codes, methods, and correlations. No modified or non-NRC approved analysis components are introduced.
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U. S. Nuclear Regulatory Commission October 13,1995 Page 2 4
Duke will perform the routine engineering analyses necessary to document validity of the correlation limit in VIPRE-01 as well as to determine the statistical design limit with 2
BWU-Z. All of these methods are approved (Reference 4, above). Following receipt of the approval for use of BWU-Z, all Core Operating Limits Report values and existing approved topical reports will be revised to reflect the new correlation Duke plans to implement the BWU Z CHF correlation into analyses for the Catawba 2 Cycle 9 core design according to the following schedule:
Duke initiate C2C9 Final Fuel Cyde Design Analysis 10/30/95 NRC approval of BWU-Z CHF correlation (Reference 3) 12/31/95 Duke initiate C2C9 Maneuvering Analysis, using BWU-Z 5/1/96 Please confirm the acceptability of the above schedule by 12/1/95.
If you have any questions, please call Scott Gewehr at (704) 382-7581.
Very truly yours.
M M. S. Tuckman cc:
Mr. V, Nerses, Project Manager Office of Nuclear Reactor Regulation U. S. Nuclear Regulatory Commission Mail Stop 14H25, OWFN Washington, D. C. 20555 Mr. R. E. Martin, Project Manager Office of Nuclear Reactor Regulation U. S. Nuclear Regulatory Commission Mail Stop 14H25, OWFN Washington, D. C. 20555 Stuart D. Ebneter, Regional Administrator U.S. Nuclear Regulatory Commission - Region II 101 Marietta Street, NW - Suite 2900 Atlanta, Georgia 30323
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.U. S. Nuclear Regulatory Commission October 13,1995 Page 3 -
Mr. G. F. Maxwell Senior Resident Inspector McGuire Nuclear Station Mr. R. J. Freudenberger Senior ResidentInspector Catawba Nuclear Station J