ML20029B675
| ML20029B675 | |
| Person / Time | |
|---|---|
| Site: | Rancho Seco |
| Issue date: | 02/14/1991 |
| From: | Weiss S Office of Nuclear Reactor Regulation |
| To: | |
| Shared Package | |
| ML20029B665 | List: |
| References | |
| NUDOCS 9103140071 | |
| Download: ML20029B675 (4) | |
Text
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J 7390-01 UNITED STATES NUCLEAR REG'JLATORY COMMISSION i
ENVIRONMENTAL A$$ESSMENT AND FINDING OFNOSIGNIFICANM/pA,Q SACRAMENTO MUNICIPAL UTILITY 3 STRICT DOCKET NO. 50-312
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The U.S. Nucinar Regulatory Commission (the Commission) is considering issuance of an exew tion from the emergency preparedness-requiesments of 10 CFR o
50.54(q) to the secta ento Municipal Utility District (SMUD) for the Rancho Seco Nuclear GeneratM i$Ution M:
'%A_SFE554f1 ident'.fict,tior, f4 Proposed Action 1he exemption will delete the requirtments for offsite emerger#/ 'esponse capability in the i>"cho Seco Emergency Plan.
l-Rancho Seco was shW down on June 7,1989 and defueling was comp}etel 'n December h, 1989.
' Need for Pracosed Action 3
The exemption is nesided to eliminate requirements that were appropriate r
for an operating plant but are not needed at the shutdown Rancho Seco facility._ Grantirg the proposed exemption would relieve SMUD from the en.necessard hnanstis, byrder of. performing Offsite emergency preparedness activities and planning o
- uired y 10 CFR 50.54(q).
Envirclpenth) Impact of the Q')osed,A,ction TM proposed action to Jeiath requirements for offsite emergency planning
- s and responte will have no environmen el impact because Rancho Seco is shut down I
and defueled and the worst case acckt it wou'Id.'aesult in radiation exposures that were less than the Environmental I cotection Agency's f. EPA) Protection Action Guides.
The licensee's 41ysit demonstreted that (se potential risk I
9103140071 910222 PDR ADOCK 05000312 p
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to the public is now significantly reduced and the range of credible accidents and accident consequences are limited after the shutdown and defueling of Rancho Seco.
The worst case accident for this facility is the dropping of a loaded spent fuel shipping cask.
The licensee's analysis showed a two hour exposure of 13.1 mrem whole body gamma dose and 2.7 x 10'4 mrem thyroid dose at 100 meters.
SMUD concluded that based upon the consequences of this worat case accident, the highest emergency classification that can occur is an Alert.
Therefore, it would be appropriate to reduce the scope of the Rancho Seco Emergency Plan by eliminsting offsite emergency response, while maintaining the emergency response capability necessary for onsite response to an Alert emergency classification.
The NRC staff has independently calculated the offsite dose resulting from a fuel handling accident and determined that the two hour whole body gamma dose would be 2.2 mrem and the thyroid dose would be 2.8 x 10'3 mrem.
3:ase values are a small fraction of the EPA's Protection Action Guideline of one (1) rem whole body gamma dosc from exposure to airborne radioactive materials.
Under these circumstances, the staff has determined that offsite emergency response planning is not required.
In addition, the requested exemption would not authorize construction or operation, and would not authorize a change in licensed activities or effect changes in the permitted types or amounts of radiological effluents. With t
regard to potential non-radiological impacts, the proposed exemption does not-affect plant non-radiological effluents and has no other environmental impact. Therefore, the Commission concludes there are no measurable radiological or non-radiological environmental impacts associated with the proposed exemption.
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I Alternatives to the Proposed Action Sir.:e the Commission concluded that there are no measurable environmental in4 pacts associated with the proposed exemption, alternatives with equal or greater environmental impacts need not be evaluated.
The principal alternative to the exemption is to require the licensee to maintain both its onsite and offsite emergency plans consistent with the requirements of 10 CFR 50.54(q).
However, the Commission has determined that there are no credible accidents which could result in 6 radiological release which would require protective actions for the public.
Requiring the maintenance of both its onsite and offsite emergency plans consistent with the requirements of 10 CTR 50.54(q) would impose an unnecessary financial burden and would not enhance protection of the public or the environment.
Alternative Use of Resources This action does not involve the use of any resources not previously considered in the Environmental Statement for Rancho Seco.
Agencies and Persnas Consulted The licensee initiated this exemption action.
The NRC staff is reviewing their request.
No other agencies or persons were consulted.
FINDING OF NO SIONIFICANT IMPACT The Commission has determined not to prepare an environmental impact statement for the proposed exemption.
Based upon this environmental assessment, the staff concludes that the proposed' action will not have a significant effect on the quality of the human environment.
For details with respect te this action, see the licensee's application dated September 20, 1990, as amended December 20, 1990, which is available for public inspection at the Commission's Public Document Room, the Gelman Building, 2120 L Street, N.W., Washington, D.C. 20555 and at the Martin Luther King Regional Library, 7340 24th Street Bypass, Sacramento, California 9582P Cated at Rockville, Maryland this 14th day of February 1993.
FOR THE NUCLEAR REGULATORY ComISSION Seymour H. Weiss, Director Non-Power Reactors, Decommissioning and Environmental Project Directorate Division of Advanced Reactors and Special Projects Office of Nuclear Reactor Regulation
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