ML18036A774
| ML18036A774 | |
| Person / Time | |
|---|---|
| Site: | Browns Ferry  |
| Issue date: | 07/16/1992 |
| From: | Ross T Office of Nuclear Reactor Regulation |
| To: | Medford M Tennessee Valley Authority |
| Shared Package | |
| ML18036A775 | List: |
| References | |
| TAC-M82125, TAC-M82126, TAC-M82127 NUDOCS 9207230156 | |
| Download: ML18036A774 (4) | |
Text
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UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON, D.C. 20555 July 16, 1992 Docket Nos. 50-259, 50-260 and 50-296 Tennesse Valley Authority ATTN: Dr. Hark 0. Hedford, Vice President Nuclear Assurance, Licensing and Fuels 3B Lookout Place 1101 Market Street Chattanooga, Tennessee 37402-2801
Dear Dr. Medford:
SUBJECT:
EVALUATION OF SEISMIC DESIGN CRITERIA FOR HEATING VENTILATION AND AIR CONDITIONING BROWNS FERRY NUCLEAR PLANT (TAC NOS.
- H82125, H82126 AND H82127)
In order to fulfillprior commitments, and resolve certain Unit 2 post-restart open items, the Tennessee Valley Authority (TVA) submitted for NRC staff review by letter dated November 15, 1991, its proposed long-term seismic design criteria for qualifying Class I Heating, Ventilation, and Air Conditioning (HVAC) ducts and supports at the Browns Ferry Nuclear Plant (BFN), Units 1, 2, and 3.
TVA also submitted several supplemental letters dated March 2, Hay 6, and June 18, 1992, in response to staff requests for additional information.
The staff reviewed TVA's submittals, including applicable supporting documentation, and conducted a limited on-site audit of selected HVAC design calculations as detailed in the enclosed safety evaluation.
Based upon the results of this safety evaluation, the staff concludes that TVA's proposed HVAC seismic design criteria are acceptable.
For HVAC ducts previously qualified to the interim restart criteria, TVA is currently committed to complete its evaluations using the new long-term design criteria by no later than six months before the Unit 2 Cycle 6 refueling outage (scheduled to begin January 29, 1993).
Long-term modifications of existing supports previously qualified to the interim restart criteria are to 920723015b 9207ib PDR ADOCK 05000259 P
Dr. Hark 0. Nedford be completed before the end of this refueling outage.
TVA is requested to formally notify the staff when each of these post-restart open items, identified in Section 2.2.2.4 of NUREG-1232, Volume 3, Supplement 2 dated January
- 1991, are fully implemented.
Furthermore, TVA is also requested to inform the staff of its plans for conducting the long-term modifications needed as a consequence of evaluating the approximately 11,830 feet of HVAC ductwork.
Sincerely,
Enclosure:
Safety Evaluation cc w/enclosure:
See next page Thierry
. Ross, Senior Project Manager Project Directorate II-4 Division of Reactor Projects I/II Office of Nuclear Reactor Regulation DISTRIBUTION Docket--Fil e
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Tennessee Valley Authority ATTN:
Dr. Hark 0. Hedford Browns Ferry Nuclear Plant CC:
Hr. John B. Waters, Director Tennessee Valley Authority ET 12A 400 West Summit Hill Drive Knoxville, Tennessee 37902 Hr. J.
R.
Bynum, Vice President Nuclear Operations 3B Lookout Place 1101 Harket Street Chattanooga, Tennessee 37402-2801 Hr.
R.
R. Baron, Site Licensing Hanager Browns Ferry Nuclear Plant Tennessee Valley Authority P.O.
Box 2000
- Decatur, Alabama 35602 Hr. 0. J. Zeringue, Vice President Browns Ferry Nuclear Plant Tennessee Valley Authority P.O.
Box 2000
- Decatur, Alabama 35602 Hr. H. J. Burzynski, Hanager Nuclear Licensing and Regulatory Affairs 5B Lookout Place Chattanooga, Tennessee 37402-2801 TVA Representative Tennessee Valley Authority 11921 Rockville Pike Suite 402 Rockville, Haryland 20852 General Counsel Tennessee Valley Authority ET 11H 400 West Summit Hill Drive Knoxville, Tennessee 37902
- Chairman, Limestone County Commission P.O.
Box 188
- Athens, Alabama 35611 Claude Earl
- Fox, M.D.
State Health Officer State Dept. of Public Health State Office Building Hontgomery, Alabama 36130 Regional Administrator U.S.N.R.C.
Region II 101 Harietta Street, N.W.
Suite 2900 Atlanta, Georgia 30323 Hr. Charles Patterson Senior Resident Inspector Browns Ferry Nuclear Plant U.S.N.R.C.
Route 12, Box 637
- Athens, Alabama 35611