ML20059D087
| ML20059D087 | |
| Person / Time | |
|---|---|
| Site: | Millstone  |
| Issue date: | 12/30/1993 |
| From: | Andersen J Office of Nuclear Reactor Regulation |
| To: | Opeka J CONNECTICUT YANKEE ATOMIC POWER CO. |
| Shared Package | |
| ML20059D091 | List: |
| References | |
| RTR-REGGD-01.097, RTR-REGGD-1.097 TAC-M51106, NUDOCS 9401060413 | |
| Download: ML20059D087 (4) | |
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UNITED STATES j
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NUCLEAR REGULATORY COMMISSION
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~c WASHINGTON, D.C. 20555 0001 December 30, 1993 Docket No. 50-245 Mr. John F. Opeka Executive Vice President, Nuclear Connecticut Yankee Atomic Power Company Northeast Nuclear Energy Company Post Office Box 270 Hartford, Connecticut 06141-0270
Dear Mr. Opeka:
SUBJECT:
MILLSTONE NUCLEAR POWER STATION, UNIT 1 - CONFORMANCE TO REGULATORY GUIDE 1.97, REVISION 2 (TAC NO. M51106)
By letter dated April 24, 1991, the NRC staff issued a safety evaluation which addressed the conformance of Millstone Unit I to Regulatory Guide (RG) 1.97, Revision 2 requirements. The safety evaluation found the Millstone Unit I design acceptable with respect to conformance to RG 1.97, except for the instrumentation to monitor reactor coolant level, reactor coolant system pressure, primary containment isolation valve position, containment and drywell hydrogen concentration, containment and drywell oxygen concentration, suppression chamber spray flow, drywell spray flow, and neutron flux.
By letters dated September 11, 1991, November 15, 1991, March 31, 1992, June 10, 1992, and September 8,1992, Northeast Nuclear Energy Company (NNECO) requested that the staff re-evaluate conformance for the monitoring instrumentation which remained unresolved. The staff's review of these submittals identified additional concerns which were addressed in NNECO submittals dated July 21, 1993, October 6, 1993, November 12, 1993, and December 16, 1993.
In addition, by letter dated July 30, 1993, NNECO responded to the staff's letter dated April 1,1993, concerning BWR neutron flux monitoring instrumentation.
The NRC staff has reviewed the latest submittals and has concluded that NNECO is in compliance with RG 1.97.
The enclosed supplemental safety evaluation contains our review of this issue.
The staff notes, however, that in the December 16, 1993, submittal, NNECO identified that two Category 2 instruments.
are not environmentally qualified to perform their intended function (turbine building secondary closed cooling water (TBSCCW) heat exchanger outlet temperature and TBSCCW pump discharge pressure, Variables 0-21 and 0-22 respectively). NNECO did not provide justification in the submittal for why this is consistent with RG 1.97 criteria. The enclosed supplemental safety evaluation does not address these two variables and NNECO should provide additional information confirming proper environmental qualification for these instruments.
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1; Mr. John F. Opeka j This requirement affects fewer than 10 respondents and, therefore, is not not subject to Office of Management and Budget review under P.L.96-511.
If you have any questions regarding this matter, please contact me at (301)504-1437.
i Sincerely,
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Original signed by I
t James W. Andersen, Acting Project Manager o
Project Directorate I-4 Division of Reactor Projects.- I/II Office of Nuclear Reactor Regulation
Enclosure:
Supplemental _ Safety Evaluation cc w/ enclosure:
See next page Distribution:
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Document Name:- G:\\ANDERSEN\\51106
Mr. John F. Opeka,
This requirement affects fewer than 10 respondents and, therefore, is not not subject to Office of Management and Budget revies under P.L.96-511.
If you have any questions regarding this matter, please contact me at (301)504-1437.
Sincerely, i
%s -
es W. Andersen, Acting Project Manager Sroject Directorate I-4
' vision of Reactor Projects - I/II Ti:e of Nuclear Reactor Regulation
Enclosure:
Supplemental Safety Evaluation cc w/ enclosure:
See next page e
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Mr. John F. Opeka Millstone Nuclear Power Station Northeast Nuclear Energy Company Unit 1 cc:
Gerald Garfield, Esquire R. M. Kacich, Director Day, Berry and Howard Nuclear Planning, Licensing & Budgeting Counselors at Law Northeast Utilities Service Company City Place Post Office Box 270 Hartford, Connecticut 06103-3499 Hartford, Connecticut 06141-0270 J. P. Stetz, Vice President J. M. Solymossy, Director Haddam Nect Plant Nuclear Quality and Assessment Services Connecticut Yankee Atomic Power Company Northeast Utilities Service Company 362 Injun Hollow Road Post Office Box 270 East Hampton, Connecticut 06424-3099 Hartford, Connecticut 06141-0270 Kevin T. A. McCarthy, Director Regional Administrator I
Monitoring and Radiation Division Region I Department of Environmental Protection U.S. Nuclear Regulatory Commission 79 Elm Street 475 Allendale Road l
Hartford, Connecticut 06106-5127 King of Prussia, Pennsylvania 19406 Allan Johanson, Assistant Director First Selectmen Office of Policy and Management Town of Waterford Policy Development and Planning Division Hall of Records 80 Washington Street 200 Boston Post Road Hartford, Connecticut 06106 Waterford, Connecticut 06385 S. E. Scace, Vice President P. D. Swetland, Resident Inspector Nuclear Operations Services Millstone Nuclear Power Station Northeast Utilities Service Company c/o U.S. Nuclear Regulatory Commission Post Office Box 270 Post Office Box 513 Hartford, Connecticut 06141-0270 Niantic, Connecticut 06357 H. F. Haynes, Nuclear Unit Director Donald B. Miller, Jr.
Millstone Unit No. 1 Senior Vice President Northeast Nuclear Energy Company Millstone Station Post Office Box 128 Northeast Nuclear Energy Company Waterford, Connecticut 06385 Post Office Box 128 Waterford, Connecticut 06385 Nicholas S. Reynolds Winston & Strawn 1400 L Street, NW Washington, DC 20005-3502 i
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