ML19263B873
| ML19263B873 | |
| Person / Time | |
|---|---|
| Site: | Millstone  |
| Issue date: | 01/16/1979 |
| From: | Ziemann D Office of Nuclear Reactor Regulation |
| To: | Counsil W NORTHEAST NUCLEAR ENERGY CO. |
| References | |
| TASK-04-01.A, TASK-4-1.A, TASK-RR NUDOCS 7901250004 | |
| Download: ML19263B873 (4) | |
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UNITED STATES
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January 16, 1979 Docket No. 50-245 Mr. W. G. Counsil, Vice President Nuclear Engineering and Operations Northeast Nuclear Energy Company Post Office Box 270 Hartford, Connecticut 06101
Dear Mr. Counsil:
Enclosed is a copy of our draft evaluation of Systematic Evaluation Program topic IV-I-A.
You are requested to examine the facts upon which the staff has based its evaluation and respond either by confirming that the facts are correct, or by identifying any errors.
If in error, please supply corrected infonnation for the docket.
We encourage you to supply for the docket any other material related to these topics that might affect the staff's evaluation.
It would be helpful if your comments were received within 30 days of the date you receive this letter.
Sincerely, Am ennis L. Zieman hief Operating Reactors Branch #2 Division of Operating Reactors
Enclosures:
Topics IV-I-A cc w/ enclosures:
See next page 7 9 012 5 0 0 oj
Mr. W. G. Counsil
_2 January 16, 1979 CC William H. Cuddy, Esquire Day, Berry & Howard Counselors at Law One Constitution Plaza Hartford, Connecticut 06103 Anthony Z. Roisman Natural Resources Defense Council 917 15th Street, N. W.
Washington, D. C.
20005 Northeast Nuclear Energy Company ATTN:
Superintendent Millstone Plant P. O. Box 128 Waterford, Connecticut 06385 Mr. James R. Himmelwright Northeast Utilities Service Company D. O. Box 270 Hartford, Connecticut 06101 Nuclear Regulatory Commission, Region I Office of Inspection and Enforcement ATTN: John T. Shediosky 631 Park Avenue King of Prussia, Pennsylvania 19406 Waterford Public Library Rope Ferry Road, Route 156 Waterford, Connecticut 06385 K M C Inc.
ATTN: Mr. Jack McEwen 1747 Pennsylvania Avenue, N.W.
Suite 1050 Washington, D. C.
20006 O
SYSTEMATIC EVALUATION PROGRAM Topic IV-I-A: Operation with less than all loops in service PLANT: Millstone Unit 1 Discussion The majority of the presently operating BWR's and PWR's are designed to pemit operation with less than full reactor coolant flow. That is, if a PWR reactor coolant pump or a BWR recirculation pump becomes inoperative, the flow provided by the remaining loop or loops is sufficient for steady state operation at some definable power level, usually less than full power.
Plants authorized for long term operation with one reactor coolant loop out of service have submitted, and the staff has approved, the necessary ECCS, steady state, and transient analysis. The remaining PWR and BWR licensees hava Technical Specifications which require a reactor shutdown within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> if one of the operating loops becomes inoperable and cannot be returned to operation within the time period.
Evaluation The docketed material for Millstone Unit 1 has been reviewed with respect to operation with less than all loop in service. Millstone Unit 1 is a 2 loop General Electric Boiling Water Reactor (BWR). The search of the docketed material reveals that no ECCS analysis supporting operation with less than all loops in service has been performed by the licensee.
However, the Millstone Unit 1 Technical Specifications (Limiting Condition for Operation 3.6.H.2) states that operation in the single loop configuration is limited to 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> at which time the inoperative loop must be reinstated into service or the facility placed in a cold shutdown condition. We
. conclude that this restriction, in lieu of an analysis supporting n-1 loop operation, bounds the staff position and is therefore acceptable. On this basis, we further conclude that Topic IV-I-A is resolved for Millstone Unit 1.
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