ML19260C921
| ML19260C921 | |
| Person / Time | |
|---|---|
| Site: | Rancho Seco |
| Issue date: | 01/23/1980 |
| From: | Reid R Office of Nuclear Reactor Regulation |
| To: | Mattimoe J SACRAMENTO MUNICIPAL UTILITY DISTRICT |
| References | |
| NUDOCS 8002070134 | |
| Download: ML19260C921 (5) | |
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UNITED sTA'. ES yy N. s.
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January 23, 1980 Docket No. 50-312 Mr. J. J. Mattimoe Assistant General Manager and Chief Engineer Sacramento Municipal Utility District 6201 S Street P. O. Box 15830 Sacramento, California 95813
Dear Mr. Mattimoe:
In our continuing evaluation of the electrical override / bypass aspects of the containment purge system at the Rancho Seco Nuclear Generating Station, we have identified additional information required in order to complete our review. This information is identified in the enclosure.
It is requested that this information be p.ov1ced within 30 days of receipt of this letter.
Sincerely, d'b t
Robert W. Reid, Chief Operating Reactors Branch #4 Division of Operating Reactors
Enclosure:
Request for Additional
- nformation on Electrical Override / Bypass Aspects of Centainment Purge Systems cc w/ enclosure:
See next 2 pages 1936 300
% 02070 13 4
Sacramer.to Municipal Utility Distri ct cc w/ enclosure (s):
Christopher Ellison, Esq.
David S. Kaplan, Secretary and Dian Grueuich, Esq.
General Counsel California Energy Commission 6201 S Street lill Howe Avenue P. O. Box 15830 Sacramento, California 95825 Sacramento, California 95813 Ms. Eleanor Schwartz Sacramento County California State Office Board of Supervisors 600 Pennsylvania Avenue, S.E., Rm. 201 827 7th Street, Room 424 Washington, D.C.
20003 Sacramento, California 95814 Docketing and Service Section Office of the Secretary Business and Municipal Department U. S. Nuclear Regulatory Commission Sacramento City-County Library Washington, D.C.
20555 828 I Street Sacramento, California 95814 Director, Technical Assessment Division Office of Radiation Programs Dr. Richard F. Cole (AW-459)
Atomic Safety and Licensing Board U. S. Environr: ental Protection Agency Panel Crystal Mall #2 U. S. fluclear Regulatory Commission Arlington, Virginia 20460 Washington, D.C.
20555 U. S. Environmental Protection Agency Mr. Frederick J. Shon Region IX Office Atomic Safety and Licensing Board ATTN:
EIS C00RDItlATOR Panel 215 Fremont Street U. S. Nuclear Regulatory Commission San Francisco, California 94111 Washingten, D C.
20555 Mr. Robert B. Borsum Elizabeth S. Bowers, Esq.
Sabcock & Wilcox Chairman, Atomic Safety and Mlear Power Generation Division Licensing Board Panel
%ite 420, 7735 Old Georgetown Road U. S. Nuclear Regulatory Commission L2thesda, Maryland 20014 Washington, DC 20555 James S. Reed, Esq.
Thomas Baxter, Eso.
Michael H. Remy, Esq.
Shaw, Pittman, Potts & Trowbridge Reed, Samuel & Remy 1800 M Street, ?!W -
717 K Street, Suite 405
'dashington, D. C.
2003G Sacramento, California 95814 Herbert H. Brown, Esq.
Mr. Michael R. Eaton Lawrence Coe Lanpher, Esq.
Energy Issues Coordinator Hill, Christopher and Phillips, P. C.
Sierra Club Legislative Office 1900 M St., NW 1107 9th St., Room 1020 Washington, D. C.
20036 Sacramento, CA 95814 1936 301
Sacramento Municipal Utility District cc w/ enclosure (s):
Atomic Safety and Licensing Board Panel U. S. Nuclear Regulatory Commission Washington, D.C.
20555 Atomic Safety and Licensing Appeal Board Panel U. S. Nuclear Regulatory Commission Washington, D.C.
20555 fir. Richard D. Castro 2231 K Street Sacramento, California 95814 Mr. Gary Hursh, Esq.
520 Capital Mall Suite 700 Sacramento, California 95814 California Department of Health ATTN: Chief, Environmental Radiation Control Unit Radiological Health Section 714 P Street, Room 498 Sacramento, California 95814 1936 302
~
ENCLOSURE RE0 VEST FOR ADDITIONAL INFORMATION_
FOR CONTAINMENT PURGE SYSTEM AND CONTAINMENT VENTING SYSTEM FOR RANCHO SECO DOCKET NO. 50- 312 1.
The docketed information as to the design of Engineered Safety Features (ESF) such as the containment ventilation isolation (CVI) systems does not adequately address the following areas. Please discuss how your ESF design confoms with each:
1 - The overriding
- of one type of safety actuation signal (e.g., radiation) should n' t cause the blocking of any o
other type of safety actuation signal (e.g., pressure) to the isolation valves.
2 - Sufficient physical features (e.g., key lock switches) should be provided to facilitate adequate administrative controls.
3 - The system-level annunciation of the overridden status should be provided for the containment isolation system and for every safety system impacted when an override is active.
4 - Diverse signals should be provided to initiate isolation of the containment ventilation system. Specifically, con-tainment high radiation, safety injection. actuation, and containment high pressure should automatically initiate Containment Ventilation Isolation (CVI).
5 - The instrumentation and control systems provided to initiate ESF should be designed and qualified as safety-grade equipment.
6 - The overriding or resetting
- of the isolation actuation signal should not cause the automatic motion of any ESF valve.
2.
Provide the schematic drawings of your purge and vent system and control room heating, ventilation and air conditioning system.
3.
Does the containment ventilation / purge valve isolation (CVI) incorporate any type of post-DBA manual override feature?
"The following definitio,'s are given for clarity of use in this issue:
Override - the signal is -till present, and it is blocked in order to perfom a function contrary to the signal; Reset - the signal has come and gone, and the circuit is being cleared to return to the normal condition.
1936 303 VER
, 4.
Is your safety injection system actuated by the same low primary system pressure circuit or setpoint as is the containment isolation?
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