ML19341E015
| ML19341E015 | |
| Person / Time | |
|---|---|
| Site: | Millstone  |
| Issue date: | 12/20/1990 |
| From: | Hodges M NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| To: | Mroczka E NORTHEAST NUCLEAR ENERGY CO. |
| References | |
| NUDOCS 9101140055 | |
| Download: ML19341E015 (6) | |
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oEC 151980 Docket No. 50-245 LS05-80-12-021 Mr. W. G. Counsil, Vice President Nuclear Engineering and Operations Connecticut Yankee Atomic Power Co.
Post Office Box 270 Hartford, Connecticut 06101
Dear Mr. Counsil:
RE: MILLSTONE - SEP TOPIC IV-2, REACTIVITY C0tiTROL SYSTEMS DESIGN AND PROTECTION AGAINST SIN'iLE FAILURES The enclosed request for information has been prepared by the staff as a pact of our review of SEP Topic IV-2.
Please provide the requested information within 90 days of receipt of this letter.
Sincerely, Dennis M. Crutchfiel Chief Operating Reactors Branch #5 Division of Licensing
Enclosure:
Request for Information on SEP Topic IV-2 cc w/ enclosure:
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e Mr. W. G. Counsil MILESTONE NUCL'AR POWER STATI0h, UNIT NO. 1 DOCKET NO. 50-245 cc William H. Cuddy, Esquire Connecticut Energy Agency Day, Berry & Howard ATTN: Assistant Director Counselors at Law Research and Policy One Constitution Plaza Development Hartford, Connecticut 06103 Department of Planning and Energy Policy Natural Resources Defense Council 20 Grand Street 917 15th Street, N. W.
Hartford, Connecticut 06106 Washington, D. C.
20005 Director, Technical Assessment Division Northeast Nuclear Energy Conpany Office of Radiation Programs ATTN:
Superintendent (AW-459)
Millstene Plant U. S. Environmental Protection P. O. Box 128 Agency Waterford, Connecticut 06385 Crystal Mall #2 Arlington, Virginia 20460
- m.. 2mes R. Himmelwri ght Northeast Utilities Service Company V. S. Environmental Protection P. 0. Box 270 Agency Hartfcrd, Connecticut 06101 Region I Office ATTN
- EIS C0ORDINATOR Resident Inspector JFK Federal Building c/o U. S. NRC Boston, Massachusetts 02203 P. O. Box Drawer KK Niantic, Connecticut 06357 Waterford Public Library Rope Ferry Road, Route 156 Waterford, Connecticut 06385 First Selectman of the Town of Waterford Hall of Records 200 Boston Post Road Waterford, Connecticut 06385 John F. Opeka Systens Superintendent Northeast Utilities Service Company P. O. Box 270 Hartford, Connecticut 06101
ENCLOSURE REQUEST FOR INFORMATION SEP TOPIC IV-2 General Design Criterion 25 requires that the reactor protection system be designed to assure that specified acceptable fuel damage limits are not exceeded in the event of any single failure of the reactivity control systems, such as accidential rod withdrawals.
1.
Describe the single failures within systems used for reactivity control which can:
a) Cause an inadvertent reactivity insertion.
b)
Cause a single or combination of rods to be positioned in other than the design sequence.
For PWRs this should include consideration of single rod withdrawal / insertions which can result from a single equipment component failure.
2.
Delineate those design features which limit reactivity insertion rates and rod malpositions resulting from a single failure. Provide the appropriate circuit schematics showing these design features.
3.
Provide or reference appropriate analyses to demonstrate that specified acceptable fuel damage limits are not exceeded in the event of any of the single failures identified in Item 1 above.
4.
Identify the operating procedures, alarms, interlocks, or protection system actions which must be used in limiting the consequences following a single failure within systems used for reactivity control. Where equipment actions are required, indicate whether the equipment meets the' criteria of IEEE-279.
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