ML20003B913
| ML20003B913 | |
| Person / Time | |
|---|---|
| Site: | Rancho Seco |
| Issue date: | 02/03/1981 |
| From: | Reid R Office of Nuclear Reactor Regulation |
| To: | Mattimoe J SACRAMENTO MUNICIPAL UTILITY DISTRICT |
| References | |
| NUDOCS 8102260114 | |
| Download: ML20003B913 (3) | |
Text
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UNITED STATES o
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NUCLEAR REGULATORY COMMISSION y,
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February 3, 1981 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:
'We have completed our review of your letter dated January 25, 1980, which responded to our request for infonnation dated November 21, 1979, con-cerning the loading on steam generator tubes induced by slug flow during natural circulation in B&W reactor plants.
In order to bound the magnitude of the loading on the steam generator tubes during natural circulation, ypur analysis assumes that the slug travels at a velocity of 64.4 ft/sec. This corresponds to full power, forced flow operation and bounds any pressure differential which could
, develop under natural circulation. By use of the dynamic momentum equation, the maximum force on each tube as a result of the force on the upper tube sheet would be less than 1/10 of the tube's theoretical buckling load of 700 pounds. Based on this analysis we conclude that slug flow induced by natural circulation will not result in adverse loading of the steam generator tubes.
l Therefore, we consider Item II.K.2.15 "Effect of Slug Flow on Steam Generator Tubes" of the TMI Action Plan Requirements is resolved for Rancho Seco Nuclear Generating Station.
Sincerely, l
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Operating Reactors Branch #4 Division of Licensing E
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s Sacramento 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.
6201 S Street California Energy Comission P. O. Box 15830 1111 Howe Avenue Sacramento, California 95813 Sacramento, California 95825 Sacramento County Ms. Eleanor Schwartz Board of Supervisors California State Office 827 7th Street, Room 424 600 Pennsylvania Avenue, S.E., Rm. 201 Sacramento, California 95814 Washington, D. C.
20003 Business and Municipal Department Docketing and Service Section Sacramento City-County Library Office of the Secretary 828 I Street U.S. Nuclear Regulatory Commission Sacramento, California 95814 Washington, D. C.
20555 Resident. Inspector / Rancho Seco Director, Criteria and Standards c/o U. S. N. R. C.
Division 14410 Twin Cities Road Office of Radiation Programs (ANR-460)
Herald, CA 95638 U. S. Environmental Protection Agency Washington, D. C.
20460 Dr. Richard F. Cole' Atomic Safety & Licensing Board Panel U.S. Nuclear Regulatory Commission U. S. Environmental Protection Agency Washington, D. C.
20555 Region IX Office ATTN:
EIS C0ORDINATOR' Mr. Frederick J. Shon 215 Fremont Street Atomic Safety and Licensing Board San Francisco, California 94111 Panel U.S. N.; clear Regulatory Commission Mr. Robert B. Borsum Washington, D. C.
20555 Babcock & Wilcox Nuclear Power Generation Division Elizabeth S. Bowers, Esq.
Suite 420, 7735 Old Georgetown Road Chairman, Atomic Safety and Bethesda, Maryland 20014 Licensing Board Panel i.
U.S. Nuclear Regulatory Commission Thomas Baxter, Esq..
Washington, D. C.
20555 l
Shaw, Pittman, Potts & Trowbridge 1800 M Street, N.W.-
Mr. Michael R. Eaton Washington, D. C.
20036 Energy Issues Coordinator Sierra Club Legislative Office Herbert H. Brown, Esq.
1107 9th Street, Room 1020 Lawrence Coe Lanpher, Esq.
Sacramento, California 95814 l
Hill, Christopher and Phillips, P.C.
i 1900 M. Street,'N.W.
Atomic Safety and Licensing Board l
Washington, D. C.
20036 Panel U.S. Nuclear Regulatory Commission Helen Hubbard Washington, D. C.
20555 P. O. Box'63 Sunol, California 94586 l-
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Sacramento Municipal Utility District cc w/e iclosure(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 L
California ~ Department:of Health,
- ATTN: Chief,. Environmental Radiation Control Unit
_ Radiological. Health Section.
714=P Street, Room 498
~ Sacramento, California e
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