ML19254F860
| ML19254F860 | |
| Person / Time | |
|---|---|
| Site: | Rancho Seco |
| Issue date: | 10/16/1979 |
| From: | Reid R Office of Nuclear Reactor Regulation |
| To: | Mattimoe J SACRAMENTO MUNICIPAL UTILITY DISTRICT |
| References | |
| NUDOCS 7911190215 | |
| Download: ML19254F860 (4) | |
Text
NRC PUBLIC DOCUMEXI RQGM f
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UNITED STATES Cfn
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WA$MNCTON, O. C. 20555 g
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%.4,p' October 15, 1979 e
Occket No. 50-312 gi
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0C.322\\673y S Mr. J. J. Mattimoe Assistant General Manager and Chief Engineer Er
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Sacramento fiunicipal Utility District 9** ##
1 6201 S Street g
P. O. Box 15830 3
Sacramento, California 95813 N
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Dear Mr. Matti=ce:
By letters dated August 31 and September 4,1979, you provided information relative to certain modifications identified in Section 3 of the Fire Pro-tection Safety Evaluation Report (SER) for the Rancho Seco !!uclear Generating Station (Amendment Mo.19 dated February 28,1978).
This information described the means for implementing the above modifications, which are scheduled for implementation by the end of the 1979 refueling outage.
The above letters also described certain deviations you desired to make relative to these modifications. This letter is to advise you of the staff's con-clusions regarding the acceptability of the modifications, and the accepta-bility of the requested deviations.
Your letter of August 31, 1979, requested a deviation from the following pre-vicusly approved modification for the west 480 volt switchgear room:
3.1.8(1)
Install a thernal barrier around the conduits containing Channel B cables associated with:
high pressure injection systems; auxiliary feedwater system, remote control for decay heat system valves; Channels B, C and D control red drive trip system circuits; and Channels B and C safety features actuation.
A similar description of the proposed modification is contained in Section 5.3.6 of the SER. The deviation was to allow either rerouting of these cables or the protection described above.
Your letter of Sectecher 4,1979, requested the same deviation for the previously approved rodification for the east 480 volt switchgear room (3.1.11(1)).
'de find the alternate acpreach provides equivalent or superior protection to the original proposed modification and that the deviations you requested relati'ie to the modifications described in Sections 3.1.3(1) and 3.1.11(1) of
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the SER will allow the fire protection for these areas to continue to confom to the guidance set forth in Section 2 of the SER.
We, therefore, conclude that these deviations are acceotable.
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- 'r. J. J. Mattimoe -
Your letters of August 31 and September 4, 1979 also described the designs you propose for imple enting these modifications.- We find that:
(1) the proposed ther.al barriers conform to a design that has been adecuately tested to demonstrate its fire resistance, (2) the pro;osed rerouting of certain circuits out of the subject areas will assure that fires in these
, areas will not cause loss of these safe shutdcwn functions, and (3) the changes to Reactor Protection System routing will assure that a fire in th'ese areas will not prevent a reactor trip.
Based on the foregoing, we conclude that the designs you have proposed for implementing these modi-fications will. provide the protection the staff intended in its preparation of the SER and, therefore, are acceptable.
Sincerely, h
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Robert W. Reid, Chief Operating Reactors Branch !4 Division of Operating Reactors cc: See next page
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1343 348
acrarento Munictpal Utility RET-tm conDESPn Distriet ENca
'. : w/ enclosure (s):
Christopher Ellison, Esq.
David S. Kaplan, Secretary and Dian Grueuich, Esq.
General Counsel California Energy Comission 5201 S Street 1111 Howe Avenue P. O. Sox 15830 Sacramento, California 95825 Sacramento, California 95813 Ms. Eleanor Schwart::
Sacramento County California State Office Soard of Supervisors 600 Pennsylvania Avenue, S.E., Rm. 201 827 7th Street, Rocm 424 Washington, D.C.
20003 Sacramento, California 95814 Occketing and Service SectierED'"
M Office of the Secretary Susiness and Municipal' Department U. S. Nuclear Regulatory Commission Sacramento City-County Library Washington,~0.C.
20555 828 I Street 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 Comission Arlingten, Virginia 20460 Washington, D.C.
20555
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U. S. Environmental Protection Agency Mr. Frederick J. Shen Region IX Office Atomic Safety and Licensing Board ATTN:
EIS COORDINATOR Panel 215 Fremont Street U. S. Nuclear Regulatory Comission San Francisco, California 94111 Washington, D.C.
20555 Mr. Rctert 9. Borsum Timothy V. A. Dillon, Esq.
Sacccck & Wilcox Suite 380 -
telear Power Generation Division 1850 K Street, N.W.
iuite 420, 7735 Old Georgetown Road Washington, D.C.
20006 Ecthesda, Maryland 20014 James S. Reed, Esq.
Michael H. Remy, Esq.
Reed, Samuel & Remy 717 X Street, Suite 405 Sacramento, California 95814 Herbert M. Brown, Esq.
Mr. Michael R. Eaton Lawrence Coe Lanpher, Esq.
Energy Issues Coordinator Hill, Christopher and Phillips, P. C.
Sierra Club Legislative Office 19CO M St., NW 1107 9th St.. Recm 1020 g
Washington, D. C.
20036 Sacramento, CA 95814 ff 1343 549 geg g
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Sacramento Municipal Utility District cc w/ enclosure (s):
j Atomic Safety and Licensing Board Panel U. S. Nuclear Regulatory Comission Washington, D.C.
20555 Atomic Safety and' Licensing Appeal Board Panel U. S. Nuclear Regulatory Comission Washington, D.C.
20555 l
Mr. Richard D. Castro 2231 X Street Sacramento, California 95814 Mr. Gary Hurshi Esq.
520 Capital Mail Suite 700 Sacramento, California 95814 California Depart =ent of Health A1TN: Chief. Environmental Radiation Control Unit Radiological Health Section 714 P Straet, Room 498 Sacramento, California 95814 i
3 1343 350 D #"D NYg~
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