ML20245A735
| ML20245A735 | |
| Person / Time | |
|---|---|
| Site: | Browns Ferry  |
| Issue date: | 06/16/1989 |
| From: | Michael Ray TENNESSEE VALLEY AUTHORITY |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| TAC-59072, TAC-59073, TAC-59074, NUDOCS 8906220143 | |
| Download: ML20245A735 (2) | |
Text
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TENNESSEE VALLEY AUTHORITY
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JUN 161989 U.S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, D.C.
20555 Gentlemen:
In the Matter of
)
Docket Nos. 50-259
.(
Tennessee Valley Authority
)
50-260 50-296 BROWNS FERRY NUCLEAR PLANT (BFN) - DIVERSITY REQUIREMENTS OF ANTICIPATED TRANSIENTS WITHOUT SCRAM (ATHS) RULE (10 CFR 50.62) FOR BFN, UNITS 1, 2 AND 3 (TAC NOS, 59072/59073/59074)
References:
1.
S. Black's letter to Oliver D. Kingsley, Jr., dated April 19, 1989 - Diversity Requirement of ATWS Rule (10 CFR 50.62) For l
BFN Units 1, 2, and 3 q
2.
R. Gridley's letter to NRC dated February 21, 1989 - ATHS Diversity Requirements of 10 CFR 50.62 Between The Analog Trip Unit Of The Alternate Rod Injection And The Recirculation Pump Trip Systems i
3.
R. Gridley's letter to NRC dated July 15, 1988 - ATHS Rule (10 CFR 50.62) - Detailed Plant Specific Design This letter responds to reference 1, which contains NRC response to TVA's support (reference 2) of the Bolling Water Reactor Owner's Group (BWROG) position that manufacturing / equipment diversity is not reasonable or practical to meet the ATWS diversity requirements for BWRs.
NRC's letter requested that TVA provide a schedule to implement an alternate rod injection / reactor trip system design that is in full compliance with the ATWS rule.
TVA has been participating in and working with the BWROG in researching the i
l ATHS diversity rule. As a result of our work and discussions with other utilities on the ATWS diversity issue, as delineated in reference 3, TVA still maintains that BFN's current ATHS design contains diversity between the ATUs of the ARI/RPT and the reactor protection systems and additional diversity is not needed. Reference 3 also stated that the additional equipment and/or manufacturing diversity would only very slightly improve the core damage frequency.
TVA continues to support the BWROG position that manufacturer / equipment diversity is not reasonable or practical to meet ATHS diversity.
Additionally, it should also be noted that the BWROG has developed another 3
(
appeal addressing the ATHS diversity issue. Accordingly, TVA requests that NRC grant an extension to the staff's schedule request for TVA to implement an alternate rod injection / reactor trip system design that is in full compliance with the ATHS rule, pending NRC's review of BWROG's latest apl+ J 8906220143 890616 f
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An Equal opportunity Ernployer
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- U.S. Nuclear Regulatory Commission JUN 161989 If you have any questions, please get in touch with Patrick P. Carter, at (205) 729-3570.
Very truly yours, TENNESSEE VALLEY AUTHORITY q[
'O Manageh,NuclearLicensing and Regulatory Affairs cc: Ms. S. C. Black, Assistant Director for Projects TVA Projects Division U.S. Nuclear Regulatory Commission One White Flint, North 11555 Rockville Pike Rockville, Maryland 20852 Mr. B. A. Wilson, Assistant Director for Inspection Programs TVA Projects Division U.S. Nuclear Regulatory Commission Region II 101 Marietta Street, NH, Suite 2900 Atlanta, Georgia 30323 NRC Resident Inspector Browns Ferry Nuclear Plant Route 12, Box 637 Athens, Alabama 35609-2000 1
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