ML20035D154
| ML20035D154 | |
| Person / Time | |
|---|---|
| Site: | Cooper  |
| Issue date: | 04/04/1993 |
| From: | Rood H Office of Nuclear Reactor Regulation |
| To: | Horn G NEBRASKA PUBLIC POWER DISTRICT |
| Shared Package | |
| ML20035D155 | List: |
| References | |
| RTR-REGGD-01.097, RTR-REGGD-1.097 GL-82-33, TAC-M51082, NUDOCS 9304120192 | |
| Download: ML20035D154 (5) | |
Text
PE Mr. Guy R. Horn 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 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 l
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) 504-1352.
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 l
and Budget, Reports Management Room 3208, New Executive Office Building, Washington, DC. 20503.
Sincerely, ORIGINAL SIGNED BY:
i Harry Rood, Senior Project Manager i
Project Directorate IV-1 Division of Reactor Projects - III/IV/V Office of Nuclear Reactor Regulation I
Enclosure:
Safety Evaluation cc w/ enclosure:
See next page j
i 1
DISTRIBUTION-Docket File NRC & Local PDRs PD4-1 Reading P. Noonan H. Rood G. Hubbard M. Virgilio J. Roe ACRS (10)(P315)
OGC (15B18)
R. Kopriva, RIV A. Hansen
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YES/NO YES/b 0FFICIAL RECORD COPY Document Name:
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f April 4, 1993 Docket No. 50-298 Mr. Guy R. Horn Nuclear Power Group Manager Nebraska Public Power District Post Office Box 499 Columbus, Nebraska 68602-0499
Dear Mr. Horn:
SUBJECT:
REGULATORY SUIDE 1.97 - BOILING WATER REACTOR NEUTRON FLUX MONITORING - COOPER NUCLEAR STATION (TAC NO. M51082)
Section 6.2 of Generic Letter 82-33 requests that applicants and licensees provide a report on their implementation of Regulatory Guide (RG) 1.97, Revision 2, and their 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 NEDO-31558,
" Position on NRC Regulatory Guide 1.97, Revision 3, Requirements for Post-Accident Neutron Monitoring System" to the NRC staff for review. NED0-31558 proposes alternate criteria for neutron flux monitoring instrumentation in lieu of the Category 1 criteria stated in RG 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 tnat, for current BWR operating license and construction permit holders, the criteria of NEDO-31558 are acceptable. However, for new license applications for both conventional and i
advanced BWR designs, the RG 1.97 criteria must be met for neutron flux monitoring instrumentation. The staff further concluded that Category 1 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 (1) to review your neutron flux monitoring instrumentation I
against the criteria of NED0-31558 to determine whether you meet these criteria, and (2) to 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 hlh fulfilled, or explicitly state any deviations from the criteria and provide i
supporting justification.
080007
A Mr. Guy R. Horn.
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 logics or similar schemes and that a single power supply failure would not i
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) 504-1352.
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.
Sincerely, ORIGINAL SIGNED BY:
Harry Rood, Senior Project Manager Project Directorate IV-1 Division of Reactor Projects - III/IV/V i
Office of Nuclear Reactor Regulation
Enclosure:
Safety Evaluation cc w/en me:
See next ap 1
DISTRIBUTION:
Docket file NRC & Local PDRs PD4-1 Reading P. Noonan H. Rood G. Hubbard M. Virgilio J. Roe ACRS (10)(P315)
OGC (15B18)
R. Kopriva, RIV A. Hansen i
B. Marcus A. B. Beach, RIV J. Gagliardo, RIV E. Collins, RIV 0fC LA:PD4-T N PM:PD4-1 _,
D(A):PD4-1 NAME PNoonanY HRood:pk GHubbard M DATE 4/M/93 k/%f93 4 '/ /93
/
COPY YES/T YES/NO YES/h OFFICIAL RECORD COPY Document Name:
C0051082.LTR
Mr. Guy R. Horn ll 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 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) 504-1352.
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 i
and Budget, Reports Management Room 3208, New Executive Office Building, Washington, DC 20503.
3 Sincerely, S
Harry R od, Senior Project Manager Project Directorate IV-1 Division of Reactor Projects - III/IV/V Office of Nuclear Reactor Regulation m h ra:
14 9 r. valuation cc w/ enclosure:
See next page i
1
I
.i Mr. Guy R. Horn Nuclear Power Group Manager Cooper Nuclear Station cc:
i j
Mr. G. D. Watson, General Counsel Nebraska Public Power District P. O. Box 499 1
Columbus, Nebraska 68602-0499 Cooper Nuclear Station ATTN: Mr. John M. Meacham l
Site Manager i
P. O. Box 98 Brownville, Nebraska 68321 Randolph Wood, Director Nebraska Department of Environmental Control P.. O. Box 98922 Lincoln, Nebraska 68509-8922 i
Mr. Richard Moody, Chairman Nemaha County Board of Commissioners i
Nemaha County Courthouse 1824 N Street Auburn, Nebraska 68305 l
Senior Resident inspector U.S. Nuclear Regulatory Commission P. O. Box 218 Brownville, Nebraska 68321 Regional Administrator, Region IV U.S. Nuclear Regulatory Commission 611 Ryan Plaza Drive, Suite 1000 1
Arlington, Texas 76011 Mr. Harold Borchert, Director Division of Radiological Health Nebraska Department of Health 301 Centennial Mall, South P. O. Box 95007 Lincoln, Nebraska 68509-5007 1
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