ML19262C466
| ML19262C466 | |
| 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 8002140022 | |
| Download: ML19262C466 (5) | |
Text
31 h. s** "c u4 UNITED STATES fr NUCLEAR REGULATORY COMMISSION j,
WA$mQTON. D. c. 2C555
/
January 23, 1980 Docket No. 50-312
%o C
U Mr. J. J. Mattimoe ss Assistant General Manager and I:
%[fi!9' Chief Engineer p
Sacramento Municipal Utility District 5
-e 6201 S Street P. O. Box 15830 Sacramento, California 95813 "O
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-I
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 reauested that this information be provided within 30 days of receipt of this letter.
Sincerely, L
-</l~
Robert W. Reid, Chief Operating Reactors Branch #4 Division of Operating Reactors
Enclosure:
Reques: for Additional Information on Electrical Override / Bypass Aspects of Centainment Purge Systems cc w/ enclosure:
See next 2 pages 0002140 6 [
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S Sacramer.to Municipal Utility cgp0 N
District sgo RE1.iTED CORREsMDENCE fj oo u 4
bp@ gSW cc w/ enclosure (s):
Christopher Ellison, Esq. @--
s/
~
Dian Grueufch, Esc.
David S. Kaplan, Secretary and General Counsel California Energy 'Comissio 6201 S Street lill Howe Avenue
\\c P. O. Box 15830 Sacramento, California 9582 C3
=
Sacramento, California 95813 Ms. Eleanor Schwartz F
California State Office Sacramento County 600 Pennsylvania Avenue, S.E., Rm. 201 Board of Supervisors 827 7th Street, Room 424 Washington, D.C.
20003 g
E Sacramento, Calffornia 95814 Docketing and Service Section M g
Office of the Secretary e
Business and Municipal Department U. S. Nuclear Regulatory Comission 1"
Sacramento City-County Library Washington, D.C.
20555 828 I Street Sacramento, California 95814 Director, Technical Assessment Division y
Office of Radiation Programs Dr. Richard F. Cole (AW-459)
Atomic Safety and Licensing Board U. S. Environmental Protection Agency Panel Crystal Mall #2 U. S. Nuclear Regulatory Comission 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 COORDINATOR Panel 6
215 Fremont Street U. S. Nuclear Regulatory Comission 6
San Francisco, California 94111 Washington, D,C.
20555 l
Mr. Robert B. Borsum Elizabeth S. Bowers, Esq.
I Sabcock & Wilcox Chairman, Atomic Safety and l
Nelear Power Generaticn Division Licensing Board Panel i
uite a20, 7735 Old Georgetown Road U. S. Nuclear Regulatory Commission 5
L2thesda, Maryland 20014 Washington, DC 20555 James S. Reed, Esq.
Thomas Baxter, Esc.
Michael H. Remy Esq, Shaw, Pittman, Potits & Trowbridge -.. _
Reed, Samuel & Remy 1800 M Street, tM- -
717 K Street, Suite 405 0
~lashington, 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
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1900 M St., NW 1107 9th St., Room 1020 Washington, D. C.
20036 Sacramento, CA 95814 D
D 9
4
'u Sacramento Municipal Utility District cc w/ enclosure (s):
Atunic Safety and Licensing Board Panel U. S. Nuclear news. Atory Commission Washington, D.C.
20555 Atomic Safety and Licensing Appeal Board Panel U. S. Nuclear Regulatory Commission Washington, D.C.
20555 Mr. 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 05814
~
1
ENCLOSURE w
REQUEST FOR ADDITIONAL INFORMATION_
E FOR CONTAINMENT PURGE SYSTEM AND CONTAINMENT VENTING SYSTEM FOR RANCHO SECO f
DOCKET NO. 50-312 1.
The docketed infonnation 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 confonns 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 3
should be provided fer the containment isolation system and for every safety system impacted when an override is active.
4 - Diverse signals should be provided to initiate isolation E
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 shculd 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 conditiening system.
3.
Does the containme it ventilation / purge valve isolation (CVI) incorporate any type of post-DBA manual override feature?
I "The following definitions are given for clarity of use in,this issue:
Override - the signal is still present, and it is blocked in order to perfonn 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.
E OVER
)
" 4.
Is your safety injection system actuated by the same low primary system pressure circuit or setpoint as is the containment isolation?
Docketing and Service Section Office of the Secretary U.S."
P..
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Wa shi..y te D. C.
20555 mn*
.