ML19332A332
| ML19332A332 | |
| Person / Time | |
|---|---|
| Site: | Millstone  |
| Issue date: | 08/27/1980 |
| From: | Tedesco R Office of Nuclear Reactor Regulation |
| To: | Counsil W NORTHEAST NUCLEAR ENERGY CO. |
| References | |
| NUDOCS 8009110523 | |
| Download: ML19332A332 (3) | |
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UNITED STATES
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[ ', 5-q NUCLEAR REGULATORY COMMISSION WASHING TON, D. C. 20555
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AUG 2 7 1980 Docket No.: 50-423 Northeast Nuclear Energy Company ATTN: Mr. W. G. Counsil Vice President, Nuclear Engineering and Operations P. O. Box 270 Hartford, Connecticut 06101 l
Dear Mr. Counsil:
SUBJECT:
INTERIM ACTIONS NEEDED FOR PLANT OPERATION PENDING FINAL RESOLUTION OF ANTICIPATED TRANSIENTS WITH FAILURE TO SCRAM (ATWS) (WESTINGHOUSE PWR)
In December 1978 the Nuclear Regulatory Comission (NRC) staff issued Volume 3 of NUREG-0460 which describes the proposed type of plant modifications the staff believes are necessary to reduce the risk from anticipated transients with failure to scram (ATWS) to an acceptable level. The NRC's Regulatory Requirements Review Committee completed its review in January 1979, and concurred with the staff's approach described in Volume 3 of NUREG-0460, insofar as it applies to your plant.
The staff has issued requests for the industry to supply generic analyses to confirm the ATWS mitigation capability described in Volume 3 of NUREG-0460. Subsequently, the staff plans to present its recomendations for rulemaking on ATWS to the Commission. The Commission would, by rulemaking, determine the required modifications to resolve ATWS concerns and the required schedule for the implementation of such modifications.
Your plant would, of course, be subject to the Commission's decision in this matter.
Based on considerations described in pages 42 through 45, Volume 3 of NUREG-0460, the staff generally concluded that plants with operating licenses can continue to operate without undue risk to the health and safety of the public during the estimated 2 to 5 year period needed to implement the necessary modifications.
However, the staff believes the following steps should be' taken as a prudent course prior to the issuance of an operating license in order to further reduce the risk from ATWS events during the interim period before the required plant modifications l
l as determined by the Commission are campleted.
1.
An emergency operating procedure should be developed for an ATWS event, including consideration of scram indicators, rod position indicators, flux monitors, pressurizer level and pressure indicators, pressurizer relief valve and safety valve position indicators, coolant average temperature, containment temperature and pressure indicators, steam generator level, pressure and flow indicators, and any other alanns 8009'110 8A3 4
i Mr. W. G. Counsil l annunciated in the control room including alams not processed through the electrical portion of the reactor scram system. The emergency operating procedure should be sufficiently simplified and unambiguous to pemit prompt ATWS recognition.
2.
The emergency operating procedure should describe actions to be taken in the event of an ATWS including consideration of manually scraming the reactor by using the manual scram buttons, prompt actuation of the auxiliary feedwater system to assure delivery of the full capacity of this system, and initiation of turbine trip. These actions must be taken imediately following the occurrence of the event. Actions should also include prept initiation of boration by actuation of the high pressure safety injection system to bring the plant to a safe shutdown condition.
We require that you submit your ATWS emergency operating procedure by November 30, 1980 for our review. Our review may include a visit to your plant to determine the feasibility of implementing your proposed procedures through operator simulation of the steps. Our evaluation must conclude that an acceptable procedure and operator training are empleted prior to the issuance of a full power operating license.
Sincerely, M *L4 9 Robert L. Tedesco, Assistant Director for Licensing Division of Licensing cc:
See next page l
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Mr. W. G. Counsil cc: Mr. John J. Korkosz, Manager Mr. H. R. Nims, Manager City of Chicopee Electric Nuclear Products Light Department e
Northeast Utilities Service Company 725 Front Street P. O. Box 270 Chicopee, Massachusetts 01014 Hartford, Connecticut 06101 Mr. James E. Tribble Mr. James R. Himmelwright Assistant to the President Northeast Utilities Service Company New England Electric System P. O. Box 270 20 Turnpike Road Hartford, Connecticut 06101
. Westborough, Massachusetts 06508 Resident inspector / Millstone NPS
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Mr. Bruce R. Garlick c/o U. S. NRC
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Manager, Energy Supply P. O. Drawer XX Fitchburg Gas and Electric Niantic, Connecticut 06357 Light Company 655 Main Street Fitchburg, Massachusetts 01421 Mr. Wardman K. Brooksbank, Manager i
Town of South Hadley Electric Light Department 85 Main Street South Hadley, Massachusetts 01075 Mr. Ralph H. Wood
' General Counsel Pub 1'c Service Company of New Hampshire 1000 Elm Street Manctester, New Hampshire 03101
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William H. Cuddy, Esq.
Day, Barry & Howard 5
One Constitution Plaza l
Hartford, Connecticut 06103
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John D. Fassett, Vice President The United Illuminating Company
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80 Temple Street New Haven, Connecticut 06508 i
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