ML19253C207
| ML19253C207 | |
| Person / Time | |
|---|---|
| Site: | Rancho Seco |
| Issue date: | 11/19/1979 |
| From: | Reid R Office of Nuclear Reactor Regulation |
| To: | Mattimoe J SACRAMENTO MUNICIPAL UTILITY DISTRICT |
| References | |
| NUDOCS 7911300183 | |
| Download: ML19253C207 (4) | |
Text
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NUCLEAR REGULATORY COMMISSION y.y3c(
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November-19, 1979 Docket No 50-312 Mr. J. J, itattimoe Assistant General Manager and Chief Engineer Sacramento f1unicipal Utility Djstrict 6201 S Street P. O. Box 15830 Sacramento, California 95813
Dear fir,
Mattimoe:
RE: Request for Additional Information on Containment Purge and Vent Systems In our continuing evaluation of the containment purge and vent systems for the Rancho Seco Nuclear Generating Station, we find that we need further information from you in order to assist us in our review. The required information is listed in' the enclosure.
It is requested that the requested information be provided within 60 days of recei t of this letter.
Sincerely, N
Robert W. Reid, Chief Operating Reactors Branch #4 Division of Operating P,eactors
Enclosure:
Request for Additional Information cc w/ enclosure:
See next page 1440 182 7 9113 00 /T3 p
Enclosure RE0 VEST FOR ADDITIONAL INFORitATION FOR CONTAINMENT PURGE SYSTEM AND CONTAINMENT VENTING SYSTEM FOR RANCHO SECO NUCLEAR GENERATING STATION DOCKET NO. 50-312 With regard to the containment purge and venting system (i.e.,
both the 66" purge lines and the 12" vent lines), provide the following information:
1.
Discuss the provisions made to ensure that isolation valve closure will not be prevented by debris which could potentially become entrained in the escaping air and steam.
2.
Discuss the provisions made for testing the availability of the isolation function and the leakage rate of the isolation valves, individually, during reactor operation.
3.
Specify the amount of containment atmosphere released through the purge and vent isolation valves for a spectrum of break sizes during the maximum expected valve closure time, includi.ng instru-ment delay.
4.
Provide an analysis to demonstrate the acceptability of the pro-visions made to protect structures and safety-related equipment; e.g., fans, filters, and ductwork, loc?ted beyond the purge system isolation valves against loss of function from the environment created by the escaping air and steam.
5.
For the containment purge isolation valves, specify the differential pressure across the valve for which the maximum leak rate occurs.
Provide test results (e.g., from vendor tests of leakage rate versus valve differential pressure) which support your conclusion.
6.
Provide an analysis of the reduction in the containment pressure resulting from the partial loss of containment atmosphere during the accident for ECCS backpressure determination.
1440 183
Sacramento Municipal Utility District 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 Sacramen+.0, California 95825 Sacramento, Cr'.ifornia 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 Business and Municipal Department h'as in o
.C 55c ramento City-County Library Sacramento, California 95814 Michael L. Glaser, Esq.
1150 17th Street, N.W.
Director, Technical Assessment Washington, D.C.
20036 Division 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 Commission Arlington, Virginia 20460 Washington, D.C.
20555 U. S. Environmental Protection Agency Mr. Frederick J. Shon Region IX Office Atomic Safety and Licer. sing Board ATTN:
EIS COORDINATOR Panel 215 Fremont Street U. S. Nuclear Regulatory Commission San Francisco, California 94111 Washington, D.C.
20555 Mr. Robert B. Borsum Timothy V. A. Dillon, Esq.
Babcock & Wilcox Suite 380 Duclear Power Generation Division 1850 K Street, N.W.
Suite 420, 7735 Old Georgetown Road Washington, D.C.
20006
!.othesda, Maryland 20014 James S. Reed, Esq.
Thomas Baxter, Esq.
Michael H. Remy, Esq' Shaw, Pittman, Potts & Trowbridge Reed, Samuel & Remy 1800 M Street,,NW 717 K Street, Suite 405 Washington, DC 20036--
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 1440 184
Sacramento Municipal Utility District 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
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