ML20044H012
| ML20044H012 | |
| Person / Time | |
|---|---|
| Site: | Browns Ferry  |
| Issue date: | 05/27/1993 |
| From: | Hebdon F Office of Nuclear Reactor Regulation |
| To: | Medford M Tennessee Valley Authority |
| Shared Package | |
| ML20044H013 | List: |
| References | |
| TAC-M51073, TAC-M51074, TAC-M51075 NUDOCS 9306070213 | |
| Download: ML20044H012 (3) | |
Text
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E NUCLEAR REGULATORY COMMISSION 2 #
WASHINGTON. D.C. 20666 o%
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May 27, 1993 Docket Nos. 50-259, 50-260 and 50-296 l
Dr. Mark 0. Medford, Vice President Technical Support Tennessee Valley Authority 3B Lookout Place 1101 Market Street Chattanooga, Tennessee 37402-2801
Dear Dr. Medford:
SUBJECT:
BROWNS FERRY NUCLEAR PLANT, UNITS 1, 2, AND 3:
REGULATORY GUIDE 1.97 - BOILING WATER REACTOR NEUTRON FLUX MONITORING
.(TAC NOS. M51073, M51074, and M51075)
Section 6.2 of Generic Letter 82-33 requests applicants and licensees to provide a report on their implementation of Regulatory Guide (R.G.) 1.97, Revision 2, and methods for complying with the Commission's regulations, including supporting technical justification of any proposed deviations or alternatives.
For the Browns Ferry Nuclear Plant (BFN), the NRC staff provided its safety evaluation of conformance to R.G.1.97 in a letter dated February 8, 1990. A large number of deviation requests were received from Boiling Water Reactor (BWR) applicants and licensees, including the Tennessee l
Valley Authority (by letter dated September 14,1990), concerning neutron flux monitoring instrumentatfor.. These requests were initially denied.
i In support of these requests, the BWR Owners Group submitted.NED0-31558,
" Position on NRC Regulatory Guide 1.97, Revision 3, Requirements for Post-Accident Neutron Monitoring System." NED0-31558 proposes alternate criteria for neutron flux monitoring instrumentation in lieu of the Category 1 criteria stated in R.G. 1.97.
The staff has completed its evaluation of NEDO-31558, and by letter dated January 13, 1993, to the BWR Owners Group, issued a safety evaluation l
(enclosed). The safety evaluation concluded that, for current BWR operating license and constructier permit holders, the criteria of NED0-31558 are acceptable. However, ior new license applications for both conventional and advanced BWR designs, the R.G.1.97 criteria must be met for neutron flux monitoring instrumentation. The staff further concluded that Category I neutron flux monitoring instrumentation is not needed for existing BWRs to cope with a Loss-of-Coolant Accident, Anticipated Transient Without Scram, or other accidents that do not result in severe core damage conditions.
Ipstrumentation to monitor the progression of core melt accidents is best 010 0 4 addressed by the current severe accident management program.
TVA is requested to review the BFN neutron flux monitoring instrumentation against the criteria of NED0-31558 to determine whether these criteria are satisfied, and to provide a letter to the NRC documenting the results of this 9306070213 930527 ADOCK0500g9 eu a a. u o A f i
PDR e
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Dr. Mark 0. Medford.
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review. -If the criteria are not satisfied, TVA should either make a commitment to meet the criteria, and state when this commitment will be fulfilled, or explicitly state any. deviations from the criteria and provide.
j supporting justification.
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The criteria of NEDO-31558 include the use of uninterruptible and reliable power sources. The BWR Owners Group and the staff agree that redundant neutron flux monitoring channels should be powered from different-uninterruptible power supplies (UPS), so that loss of a single UPS would not-cause the loss of. all channels.. Therefore, TVA is requested to perform a.
plant-specific evaluation for BFN Units 1, 2,. and 3, reviewing the power I
supplies to neutron flux monitoring instrumentation,. including recorders.
This review should verify that power would not be. lost during design basis events by load shedding logics or similar schemes, and that a single power.
supply failure would not cause the loss of all channels. The results of this review should be indicated in TVA's response to the staff concerning this issue.
l Please notify the NRC, within 60 days of receipt of this letter, of the J
actions TVA plans to take, and the schedule for implementation.
If you have any questions regarding this issue, please call Thierry Ross at (301) 504-1474, or Joe Williams at (301) 504-1470.
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This request for information was approved by the Office of Management and-Budget under clearance number 3150-0011 which expires June 30, 1994.
Comments on burden and duplication may be directed to the Office of Management and Budget, Reports Management Room 3208, New Executive Office Building, Washington, DC 20503.
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l Sincerely, l
Original signed by Frederick J. Hebdon, Director Project Directorate II-4 Division of Reactor Projects - I/II Office of Nuclear Reactor Regulation i
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Enclosure:
l Safety Evaluation j
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See next page OFFICE PDII-4/LA PD11-4/PM M PDIl-4/Ph PDII,-4/D NAME MSanderslhd JWilliadas TRoss Mr4 FHebYod DATE 6/P//93 f/27/93 f/R/93 5 /)?/93 DOCUMENT NAME:
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Mr. W. H. Kennoy, Director State Health Officer Tennessee Valley Authority Alabama Dept. of Public Health ET 12A 434 Monroe Street 400 West Summit Hill Drive Montgomery, Alabama 36130-1701
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Knoxville, Tennessee 37902 Mr. R. M. Eytchison, Vice President-Regional Administrator i
Nuclear Operations U.S.N.R;C. Region II Tennessee Valley Authority 101 Marietta Street, N.W.
3B Lookout Place Suite 2900 1101 Market Street Atlanta, Georgia 30323 Chattanooga, Tennessee 37402-2801 Mr. Charles Patterson Site Licensing Manager Senior Resident Inspector i
Browns Ferry Nuclear Plant Browns Ferry Nuclear Plant Tennessee Valley Authority U.S.N.R.C.
P.O. Box 2000 Route 12, Box-637 Decatur, Alabama 35602 Athens, Alabama 35611-Mr. O. J. Zeringue, Vice President Manager, Nuclear Assurance Browns Ferry Nuclear Plant and. Licensing Tennessee Valley Authority Browns Ferry Nuclear Plant-P.O. Box 2000 Tennessee Valley Authority l
Decatur, Alabama 35602 P. O. Box 2000 Decatur, Alabama 35602 Mr. M. J. Burzynski, Manager Tennessee Valley Authority t
Nuclear Licensing and Regulatory Affairs 5B Lookout Place 1101 Market Street Chattanooga, Tennessee 37402-2801 i
TVA Representative Tennessee Valley Authority 11921 Rockville Pike Suite 402 Rockville, Maryland 20852 General Counsel i
Tennessee Valley Authority ET 11H 400 West Summit Hill Drive 1
Knoxville, Tennessee 37902-Chairman, Limestone County Commission P.O. Box 188 Athens, Alabama 35611 a,
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'DocketsFile-NRC & Local PDRs j
BFN Reading S. Varga I
G. Lainas F. Hebdon M. Sanders J. Williams T. Ross A. Hansen i
E. Herschoff,.RII P. Frederickson, RII J. Crlenjak, RII i
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