ML20035H310
| ML20035H310 | |
| Person / Time | |
|---|---|
| Site: | Vermont Yankee File:NorthStar Vermont Yankee icon.png |
| Issue date: | 04/29/1993 |
| From: | Dan Dorman Office of Nuclear Reactor Regulation |
| To: | Reid D VERMONT YANKEE NUCLEAR POWER CORP. |
| Shared Package | |
| ML20035H311 | List: |
| References | |
| RTR-REGGD-01.097, RTR-REGGD-1.097 TAC-M51365, NUDOCS 9305040179 | |
| Download: ML20035H310 (4) | |
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April 29, 1993 a....
Docket No. 50-271 Mr. Donald A. Reid, Vice President -
Operations Vermont Yankee Nuclear Power Corporation Ferry Road Brattleboro, Vermont 05301
Dear Mr. Reid:
SUBJECT:
REGULATORY GUIDE 1.97 - BOILING WATER REACTOR NEUTRON FLUX MONITORING (TAC NO. M51365)
Section 6.2 of Generic Letter 82-33 requested 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. A large number of deviation requests were received from Boiling Water Reactor (BWR) applicants and licensees concerning neutron flux monitoring instrumentation.
These requests were initially denied.
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." NEDO-31558 proposed 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 NED0-31558, and by letter dated January 13, 1993, to the BWR Owners Group, issued a safety evaluation (enclosed). The safety evaluation concluded that, for current BWR operating license and construction permit holders, the criteria of NED0-31558 are acceptable. However, for new license applications for both conver.tional and advanced BWB 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.
Instrumentation to monitor the progression of core melt accidents is best addressed by the current severe accident management program.
You are requested to review your neutron flux monitoring instrumentation against the criteria of NED0-31558 to determine whether you meet these criteria, and provide a letter to the NRC documenting the results of your review.
If you do not meet the criteria, you 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 supporting justification.
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Mr. Donald A. Reid -April 29, 1993 l
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-The criteria of NED0-31558 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.
You are, therefore, requested to perform a.
plant-specific evaluation'to' review the power' 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 i
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 your response to the staff concerning this issue.
i Since neutron flux monitoring instrumentation for BWRs is no longer considered to be Category 1 instrumentation, you may request the removal of neutron flux monitoring instrumentation from your post-accident monitoring technical specifications.
If you wish to maintain a post-accident monitoring technical specification on this instrumentation, you may do so.
Please notify the NRC, within 60 days of receipt of this letter, of the f
actions you plan to take and your schedule for implementation.
If you have any questions regarding this issue, please do not hesitate to contact me at (301) 504-1429.
j 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 l
Budget, Reports Management Room 3208, New Executive Office Building, Washington, DC 20503.
l Sincerely, Original signed b Daniel H. Dorman,y: Project Manager Project Directorate I-3 Division of Reactor Projects - I/II Office of Nuclear Reactor Regulation l
Enclosure:
Safety Evaluation cc w/ enclosure:
See next page e'
DISTRIBUTION:
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NRC & Local PDRs TClark AHansen PDI-3 Reading DDorman BMarcus i
SVarga 0GC JCalvo ACRS (10)
Off!CE LA:PDI-3 PM:PDI-1 D:PDI-3 f[M NAME DDorman:N WButler ks[
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DATE OFFICIAL RECORD COPY FILENAME: A:\\VYM51365.LTR 2
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Mr. Donald A. Reid April 29,1993 1
I The criteria of NED0-31558 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.
You are, therefore, requested to perform a plant-specific evaluation to review the power 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 i
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 your response to the staff concerning this issue. '
Since neutron flux monitoring instrumentation for BWRs is no longer considered to be Category 1 instrumentation, you may request the removal of neutron flux monitoring instrumentation from your post-accident monitoring technical
~
specifications.
If you wish to maintain a post-accident monitoring technical specification on this instrumentation, you may do so.
Please notify the NRC, within 60 days of receipt of this letter, of the actions you plan to take and your schedule for implementation.
If you have any questions regarding this issue, please do not hesitate to contact me at (301) 504-1429.
This request for information was approved by the Office of Management and i
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 Manay at Room 3208, New Executive Office Building,
}
Washington, DC 20503.
I Sincerely, 0.
zwc Daniel H. Dorman, Project Manager i
Project Directorate I-3 Division of Reactor Projects - I/II Office of Nuclear Reactor Regulation 3
Enclosure:
Safety Evaluation cc w/ enclosure:
See next page 1
i i
Mr. Donald A. Reid, Vice President Vermont Yankee Nuclear Power Station Operations cc:
Mr. Jay Thayer, Vice President G. Dana Bisbee, Esq.
Yankee Atomic Electric Company Office of.the Attorney General 580 Main Street Environmental Protection Bureau Bolton, Massachusetts 01740-1398 State House Annex 25 Capitol Street-Regional Administrator, Region I Concord, New Hampshire 03301-6937-
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U. S. Nuclear Regulatory Commission 475 Allendale Road Resident Inspector King of Prussia, Pennsylvania 19406 Vermont Yankee Nuclear Power Station U.S. Nuclear Regulatory Commission R. K. Gad, III P. O. Box 176~
Ropes & Gray Vernon, Vermont 05354 One International Place Boston, Massachusetts 02110-2624 Chief, Safety Unit Office of the Attorney General Mr. Ri<f-
. Redann, Commissiotier One Ashburton Place,19th Floor:
i Vermont Department of Public Service Boston, Massachusetts 02108 120 State Street, 3rd Floor Montpelier, Vermont 05602 Mr. David Rodham, Director Massachusetts Civil Defense Agency Public Service Board 400 Worcester Rd.
State of Vermont P.O. Box 1496 120 State Street Framingham, Massachusetts 01701-0317 Montpelier, Vermont 05602 ATTN: James Muckerheide i
Chairman, Board of Selectmen Mr. Raymond N. McCandless Town of Vernon Vermont Division of Occupational i
Post Office Box 116 and Radiological Health Vernon, Vermont 05354-0116 Administration Building Montpelier, Vermont 05602 Mr. J. P. Pelletier, Vice President Vermont Yankee Nuclear Power Mr. L. A. Tremblay i
Corporation Senior Licensing Engineer Ferry Road Vermont Yankee Nuclear Power Brattleboro, Vermont 05301 Corporation 580 Main Street Bolton, Massachusetts 01740-1398 j
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