ML13316B283
| ML13316B283 | |
| Person / Time | |
|---|---|
| Site: | San Onofre  |
| Issue date: | 01/31/1989 |
| From: | Knighton G Office of Nuclear Reactor Regulation |
| To: | |
| Shared Package | |
| ML13316B282 | List: |
| References | |
| NUDOCS 8902090212 | |
| Download: ML13316B283 (3) | |
Text
7590-01 UNITED STATES NUCLEAR REGULATORY COMMISSION SOUTHERN CALIFORNIA EDISON COMPANY SAN DIEGO GAS AND ELECTRIC COMPANY DOCKET NO. 50-206 SAN ONOFRE NUCLEAR GENERATING STATION, UNIT NO. 1 ENVIRONMENTAL ASSESSMENT AND FINDING OF NO SIGNIFICANT IMPACT The U.S. Nuclear Regulatory Commission (the Commission) is considering issuance of an amendment to Provisional Operating License No. DPR-13 issued to Southern California Edison Company, et al., (the licensee), for operation of San Onofre Nuclear Generating Station, Unit No. 1, located in San Diego County, California.
ENVIRONMENTAL ASSESSMENT Identification of Proposed Action:
The proposed amendment is a request to revise Technical Specification 3.5.1 and Table 2.1 to incorporate revised steam/feedwater flow mismatch reactor trip setpoints and revised limiting conditions for operation. The reactor trip on steam/feedwater flow mismatch would occur on either high or low mismatch of 25%
when the reactor is above 50% power. Below 50%, the trip would not activate, but reactor protection would be provided by a 50% setting on pressurizer level which would be active at all power levels. The proposed changes are designed to correct a single failure deficiency in the steam/feedwater flow reactor trip circuit identified in an earlier report dated November 20, 1987.
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-2 The Need for the Proposed Action:
The proposed amendment is required to implement the changes described above and thereby correct a single failure deficiency in the reactor protection system.
Environmental Impacts of the Proposed Action:
The proposed action would not involve a significant change in the probability or consequences of any accident previously evaluated, nor does it involve a new or different kind of accident. Consequently, any radiological releases resulting from an accident would not be significantly greater than previously determined. The proposed amendment does not otherwise affect routine rddiological plant effluents. Therefore, the Commission concludes that there are no significant radiological environmental impacts associated with the proposed amendment. The Commission also concludes that the proposed action will not result in a significant increase in individual or cumulative occupa tional radiation exposure.
With regard to nonradiological impacts, the proposed amendment does not affect nonradiological plant effluents and has no other environmental impact.
Therefore, the Commission concludes that there are no significant nonradiological environmental impacts associated with the proposed amendment.
The Notice of Consideration of Issuance of Amendment and Opportunity for Hearing in connection with this action was published in the Federal Register on January 17, 1989 (54 FR 1808)No request for hearing or petition for leave to intervene was filed following this notice.
Alternatives to the Proposed Action:
Because the Commission has concluded that there are no significant environmental impacts associated with the proposed action, there is no need to examine alternatives to the proposed action.
-3 Alternative Use of Resources:
This action does not involve the use of resources not previously considered in connection with the Final Environmental Statement related to operation of San Onofre Nuclear Generating Station, Unit No. 1, dated October 1973.
Agencies and Persons Consulted:
The NRC staff has reviewed the licensee's request that supports the proposed amendment. The NRC staff did not consult other agencies or persons.
FINDING OF NO SIGNIFICANT IMPACT The Commission has determined not to prepare an environmental impact statement for the proposed amendment.
Based upon the foregoing environmental assessment, the Commission concludes that the proposed action will not have a significant effect on the quality of the human environment.
For further details with respect to this action, see the application for amendment dated November 11, 1988, which is available for public inspection at the Commission's Public Document Room, 2120 L Street NW., Washington, DC 20555, and at the General Library, University of California, P.O. Box 19557, Irvine, California 92713.
Dated at Rockville, Maryland, this 31st day of January, 1989.
FOR THE NUCLEAR REGULATORY COMMISSION George. Knighto Director Project Directorate V Division of Reactor Projects - III, IV, V and Special Projects Office of Nuclear Reactor Regulation