ML20217C734
| ML20217C734 | |
| Person / Time | |
|---|---|
| Site: | Browns Ferry  |
| Issue date: | 07/11/1991 |
| From: | Ross T Office of Nuclear Reactor Regulation |
| To: | Nauman D TENNESSEE VALLEY AUTHORITY |
| Shared Package | |
| ML18036A293 | List: |
| References | |
| TAC-68517, TAC-68518, TAC-68519, NUDOCS 9107180092 | |
| Download: ML20217C734 (4) | |
Text
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NUCLEAR REGULATORY COMMISSION 3
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'o WASHING 1oN, D C. M56 July 11, 1991 Docket Nos. 50-259, 50-260, and 50-296 i
Mr. Dan A. Nauman Senior Vice President, Nuclear Power Tennessee Valley Authority 6N 38A Lookout Place 1101 Market Street Chattanooga, Tennessee 37402-2801
Dear Mr. Naumar:
SUBhCT:
SAFETY EVALVATION ON THE CONFORMANCE OF THE BROWNS FERRY NUCLEAR PLANT WITH THE STATION BLACK 0UT RULE (TAC NOS. 68517, 68518, AND68519)
By letters dated April 18, 1989, April 5, 1990, and May 4, 1990, the Tennessee Authority (TVA) submitted its response to the Station Blackout (SB0)
Valley (i.e.,10 CFR 50.63) for the Browns Ferry Nuclear (BFN) Plant.In addition, rula TVA responded to a number of questions raised during)a telecon with the NRC and Science Applications International Corporation (SAIC on October 25, 1990.
Enclosed H the NRC staff's Safety Evaluation (SE) of TVA's response to the 580 rule. Aho provided as an attachment to this enclosure is the applicable Technical Evaluation Report (TER) from SAIC, " Browns Ferry Nuclear Plant, Units 1, 2, and 3, Station Blackout Evaluation," SAIC-91/6659 dated May 31, 1991.
Based on the enclosed SE, the staff concluded that BFN Units 1 and 3 are not in conformance with 10 CFR 50.63, and TVA must submit a revised response. More specifically, the staff determined that existing batteries are incapable of supplying adequate electrical power to the safe shutdown systems of all operating units during an SB0 event, As a result, the staff cannot conclude that all three BFN units conform to the SB0 rule until the battery capacity issue is resolved. TVA is committed to fully comply with 10 CFR 50.63, for Units 1 and 3, prior to their respective restart datcs.
In order to provide the steff sufficient time to evaluate TVA's revised response for Unit 3 and still allow
-TVA enough opportunity to implement any procedure changes or modifications prior to restart, TVA is requested to submit their revised response as soon as possible but no later than December 31, 1991. This revised response is to resolve the l
staff's specific concerns regarding inadequate battery capacity and address the staff recommendations detciled in the enclosed SE. A similar submittal is also required for Unit I no later than 24 months before its scheduled restart date.
With regard to BFN Unit 2, the staff determined that existing battery capacity l
is adequate for the operation of this single unit.
Consequently, the staff concluded that the information and schedule for implementing necessary procedure changes submitted by TVA conforms with the SB0 rule for Unit 2.
However, this i
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Mr. Dan A Nauman conclusion is contingent upon TVA's satisfactory resolution of recommendations detailed in the enclosed SE. These staff recommendations instruct TVA to do the following: verify the capability of existing batteries to also supply electrical power for turbine / generator emergency oil pumps and emergency diesel generators (EDG) during an 500 event; revise heat.up calculations for the control room, safety-related equipment rooms and the drywell using more conservative values; reevaluate containment isolation valves according to the exclusion criteria of Regulatory Guide 1.155; incorporate applicable SB0 equipment into an appropriate quality assurance (QA) program; and implement an EDG reliability program.
Although TVA has already conunitted to revise appropriate procedures as necessary the staff's SE,10 CFR 50.63(c) quired for SRO) within a year af ter issuance of (no Unit 2 modifications are re (4) requires TVA to submit an implementation schedule within 30 days af ter receipt of the staff's regulatory assessment (i.e.,SE). As part of this submittal, TVA is also requested to address each of the staff reconsnendations for Unit 2 and provide an implementation schedule as applic6ble.
On March 8,1991, in a meeting with the Advisory Conrnittee on Reactor Safeguards (ACRS) regarding BFN, Unit 2 restart, the ACRS posed a question with respect to the environmental impact upon solid-state equipment due to an SB0 event and concurrent loss of ventilation, in response to that question, TVA provided heat.up values which were different than those originally submitted to the NRC in response to 10 CFR 50.63. TVA is requested to address why these values are different.
Furthermore, although the heat.up values provided to the ACRS by TVA were higher than those submitted in rccponse to the 500 rule, tha staff believes they are still non. conservative and as such, would not adequately resolve the staff recommendation identified above, it should be noted that NRC guidance provided on technical sp-d fications (TS) for SB0 states that TS should be consistent with the Interim Consnission policy Statement. The staff has taken the position that TS are required for SBO.relat.d equipment. However, the question of how TS fca ;B0 equipment will be applied is currently being concidered by the NRC on a generic basis within the context of the TS Improvement Program. For the interim, the staff expects BFN procedures to reflect appropriate testing and surveillance requirements to ensure the operability of necessary SB0 equipment.
If the NRC later determines that TS for SB0 equipment are warranted, TVA will be notified.
Sincerely, E
'Thierr[pM Ross, Project Manager Project Directorate 11 4 Division of Reactor Projects - I/II Office of Nuclear Reactor Regulation
Enclosure:
Safety Evaluation cc w/ enclosure:
See next page OFC
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DATE :i/d/91
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- 7////91 0FFICIAL RECORD COPY Document Name: BFSB0
Mr. Dan A. Nauman cc:
Mr. Marvin Runyon, Chairman Mr. O. J. Zeringue, Site Vice President Tennessee Valley Authority Browns Ferry Nuclear Plant ET 12A Tennessee Valley Authority 400 West Summit Hill Drive P. O. Box 2000 Knoxville, Tennessee 37902 Decatur, Alabama 35602 Mr. John P. Waters, Director Mr. P. Carier, Site Licensing Manager Tennessee Valley Authority Browns Ferry Nuclear Plant ET 12A Tennessee Valley Authority 400 West Sunnit Hill Drive P. O. Box 2000 Knoxville, Tennessee 37902 Decatur, Alabama 35602 Mr. W. H. Kennoy, Director Tennessee Valley Authority Mr. L. W. Myers, Plant Manager ET 12A Browns Ferry Nuclear Plant 400 West Sunnit Hill Drive Tennessee Valley Authority Knoxville, Tennessee 37902 P. 0.-Box 2000 Decatur, Alabama 35602 Mr. H. F. Willis Chairman, Limestone County Commission Senior Executive Officer P. O. Box 188 ET 12B Athens, Alabama 35611 400 West Summit Hill Drive Knoxville, Tennessee
'7902 Claude Earl Fox, M.D.
State Health Officer General Counsel State Department of Public Health Tennessee Valley Authority State Office Building ET 11H Montgooery, Alabama 36130 400 West Summit Hill Drive Knoxville, Tennessee 37902 Regienal Administrator, Region 11 U.S. Nuclear Regulatory Commission Mr. Dwight Nunn 101 Marietta Street. N.W.
Vice President, Nuclear Projects Atlanta, Georgia 30323 Tennessee Valley Authority 3B Lookout Place Mr. Charles Patterson 1101 tiarket Street Senior Resident inspector Chattanooga, Tennessee 37402-2801 Browns Ferry Nuclear Plant U.S. Nuclear Regulatory Commission Dr. Mark 0. Medford Route 12. Box 637 Vice President, Nuclear Assurance Athens, Alabama 35611 Licensing and Fuels Tennessee Valley Authority Tennessee Valley Authority 6B Lookout Plece Rockville Office Chattanooga, Tennessee 37402-2801 11921 Rockville Pike Suite 402 Mr.. Edward G. Wallace Rockville, Maryland 20852 Manager, Nuclear Licensing and Regulatory Affairs Tennessee Valley Authority SB Lookout Place Chattanooga, Tennessee 37402-2801 l
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