ML19340E328
| ML19340E328 | |
| Person / Time | |
|---|---|
| Site: | Dresden  |
| Issue date: | 12/15/1980 |
| From: | Crutchfield D Office of Nuclear Reactor Regulation |
| To: | Abel J COMMONWEALTH EDISON CO. |
| References | |
| TASK-04-02, TASK-4-2, TASK-RR LSO5-80-12-018, LSO5-80-12-18, NUDOCS 8101140047 | |
| Download: ML19340E328 (4) | |
Text
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DEC 15 1980 Docket No. 50-10 50-237 LS05-80-12-018 Mr. J. S. Abel Director of Nuclear Licensing Commonwealth Edison Company Post Office Box 767 Chicago, Illinois 60690
Dear Mr. Abel:
RE: DRESDEN 1 AND 2 - SEP TOPIC IV-2, REACTIVITY CONTROL SYSTE)S DESIGN AND PROTECTION AGAINST SINGLE FAILURES The enclosed request for information has been prepared by the staff as a part of our review of SEP Topic IV-2.
Please provide the requested information within 90 days of receipt of this letter.
Sincerely,
. E h, J; bbl /Y 7
Dennis M. Crutchfield, l'hief Operating Reactors Branch #5 Division of Licensing l
Enclosure:
Request for Information on SEP Topic IV-2 cc w/ enclosure:
See next page l
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Mr. J. S. Abel DRESDEN NUCLEAR POWER STATION, UNIT N0. 2 DOCKET NO. 50-237 CC Isham, Lincoln & Beale Department of Public Health Counselors at Law ATTN: Chief, Division of One First National Plaza, 42nd Floor Nuclear Safety Chicago, Illinois 60603 535 West Jefferson Springfield, Illinois 62761 Mr. B. B. Stephenson Plant Superintendent Director, Technical Assessment Dresden Nuclear Power Station Division Rural Route el Office of Radiaticn Programs Morris, Illinois 60450 (AW-459)
U. S. Environmental Protection Agency Natural Resources Defense Council Crystal Mall #2 91715th Street, N. W.
Arlington, Virginia 20460 Washington, D. C.
20005 U. S. Environmental Protection U. S. Nuclear Regulatory Commission Agency Resident Inspectors Office Federal Activities Branch Dresden Station Region V Office RR #1 ATTN:
EIS C0ORDINATOR Morris, Illinois 60450 230 South Dearborn Street Chicago. Illinois 60604 Susan N. Sekuler Assistant Attorney General Dr. Forrest J. Remick Environmental Control Division 305 East Hamilton Avenue 188 W. Randolph Street State College. Pennsylvania 16801 Suite 2315 Chicago, Illinois 60601 Morris Public Library 604 Liberty Street Morris, Illinois 60451 Chai rman Board of Supervisors of i
Grundy County Grundy County Courthouse Morris, Illinois 60450 John F. Wolfe, Esquire s 3409 Shepherd Street Chevy Chase, Maryland 20015 Dr. Linda W. Little
\\
500 Hermitage Drive Raleigh, North Carolina 27612 1
1 ENCLOSURE
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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 re' activity 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.
l 4.
Identify the operating procedures, alarms, in'terlocks, 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 tfie' criteria of IEEE-279.
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