ML20028B782
| ML20028B782 | |
| Person / Time | |
|---|---|
| Site: | Rancho Seco |
| Issue date: | 11/22/1982 |
| From: | Stolz J Office of Nuclear Reactor Regulation |
| To: | Mattimoe J SACRAMENTO MUNICIPAL UTILITY DISTRICT |
| Shared Package | |
| ML20028B783 | List: |
| References | |
| IEB-80-11, TAC-42918, NUDOCS 8212060024 | |
| Download: ML20028B782 (4) | |
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I NOVEMBER 2 21K3 e
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L PDR OR8#4 Rdg Docket No. 50-312 DEisenhut OELD
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AEOD EJordan Mr. J. J. Mattimoe JTaylor Assistant General Manager and ACRS-10 Chief Engineer SMiner Sacramento Municipal Utility RIngram 1
District Gray File 6201 S Street EBlackwood P. O. Box 15830 H0rnstein Sacramento, California 95813 FSchauer
Dear Mr. Mattimoe:
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SUBJECT:
RANCHO SECO NUCLEAR POWER PLANT - MASONRY WALL DESIGN I&E BULLETIN 80-11 During our review of your responses to IE Bulletin 80-11 on masonry wall design, we noted that you had not addressed the adequacy of the masonry wall for a tornado event. We subsequently had a number of telephone conversations with you and your architect-engineer (A/E)
Bechtel regarding this subject.
Initially we thought that your walls were adequately designed and constructed to withstand 101 mph winds including missiles associated with this wind speed.
However, subsequent to this in your letter dated September 21, 1982 and during a telephone conversation with your staff on October 5,1982, you stated that the walls were installed for security reasons only and do not serve as tornado barriers.
In addition, they are not designed to withstand missiles associated with 101 mph winds.
As a result of this, we are somewhat confused as to why the collapse of these walls is a safety concern under a seismic event (categorized as safety related walls per licensee response to IE Bulletin 80-11) i but is not a safety concern during a tornado event. Therefore, in order for us to complete our evaluation of the adequacy of your masonry wall design (IE Bulletin 80-11) we require the following additional infonnation:
l.
Provide an evaluation of the design adequacy of the ma'sonry walls to postulated missile impact including your evaluation criteria.
You should also address the effects of secondary missiles, as l
applicable.
If this evaluation indicates the inadequacy of these masonry walls to withstand missile impact, then please comit to strengthen these walls to meet SEB criteria (see Enclosure).
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NRC FORM 318 (10-80) NRCM ONO OFFICIAL RECORD COPY usom mi_mm
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e lir. J. J. Mattimoe 2.
If you consider that these walls are not safety related with respect to the tornado event, then a logical explanation indicating why these walls are safety related with respect to seismic but not safety related with regard to tornado events should be provided for the staff's review.
Please provide the requested information within 30 days of receipt of this letter.
The reporting and/or recording keeping requirments contained in this letter affect fewer than ten respondents; therefore, 02 clearance is not required under P. L.95-511.
Sincerely,
%uuua, uom y JOIm y, g o z,,
JohiF.~~Stolz, Chief Operating Reactors Branch #4 Division of Licensing
Enclosure:
Criteria for Safety-Related flasonry Wall Evaluation cc w/ enclosure:
See next page ORB #4:
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u Sacramen'to Municipal Utility Rancho Seco. Docket No. 50-312 District cc w/ enclosure (s):
David S. Kaplan, Secretary and Christopher Ellison, Esq.
General Counsel Dian Grueuich, Esq.
Sacramento flunicipal Utility California Energy Comission District 1111 Howe Avenue 6201 S Street Sacramento, California 95825 P. O. Box 15830 Sacramento, California 95813 Ms. Eleanor Schwartz California State Office Sacramento County 600 Pennsylvania Avenue, S.E., Rm. 201 Board of Supervisors Washington, D. C.
20003 827 7th Street, Room 424 Sacramento, California 95814 Docketing and Service Section Office of the Secretary U.S. Nuclear Regulatory Commission Washington, D. C.
20555 Resident inspector / Rancho Seco c/o U. S. N. R. C.
14410 Twin Cities Road Herald, CA 95638 Dr. Richard F. Cole Atomic Safety a Licensing Board Panel U.S. Nuclear Regulatory Comission Washington, D. C.
20555 Regional Radiation f.epresentative EPA Recion IX Mr. Frederick J. Shon 215 Fremont Street Atomic Safety and Licensing Board San Francisco, California 94111 Panel U.S. Nuclear Regulatory Comission Mr. Robert B. Borsum Washington, D. C.
20555 Babcock & Wilcox Nuclear Power Generation Division Elizabeth S. Bowers, Esq.
Suite 220, 7910 Wooamont Avenue Chairman, Atomic Safety and Bethesda, Maryland 20814 Licensing Board Panel U.S. Nuclear Regulatory Comission l
Thomas Baxter, Esq.
Washington, D. C.
20555 I
Shaw, Pittman, Potts & Trowbridge 1800 M Street, N.W.
Washington, D. C.
20036 Herbert H. Brown, Esq.
Lawrence Coe Lanpher, Esq.
Hill, Christopher and Phirlips, P.C.
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l 1900 M Street, N.W.
Atomic Safety and Licensing Board Washington, D. C.
20036 Panel U.S. Nuclear Regulatory Comission Helen Hubbard Washington, D. C.
20555 P. O. Box 63 Sunol, California 94586 l
1
o Sacramento Municipal Utility 2-District Atomic Safety and Licensing Appeal
.Mr. Robert H. Engelken, Regional Administrator Soard Panel U. S. Nuclear Regulatory Commission, Region V U.S. Nuclear Regulatory Commission 1450 Maria Lane, Suite 210 Washington, D. C.
20555 Walnut Creek, California 94596 Alan S. Rosenthal, Chairman Atomic Safety and Licensing Appeal Board U. S. fluclear Regulatory Connission Washington, D. C.
20555 Dr. John H. Buck Atonic Safety and Licensing Appeal Board U. S. Nuclear Regulatory Connission Washington, D. C.
20555 Christine M. Kohl Atonic Safety and Licensing Appeal Board U. S. Nuclear Regulatory Comnission' Washington, D. C.
20553 California Department of Health ATTN: Chief, Environmental Radiation Control Unit Radiological Health Sectio:.
714-P Street, Room 498 Sacramento, California 95814 O
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