ML20245J319
| ML20245J319 | |
| Person / Time | |
|---|---|
| Site: | San Onofre  |
| Issue date: | 08/09/1989 |
| From: | Knighton G Office of Nuclear Reactor Regulation |
| To: | |
| Shared Package | |
| ML20245J322 | List: |
| References | |
| NUDOCS 8908170665 | |
| Download: ML20245J319 (4) | |
Text
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7590-01 i
i UNITED STATES NUCLEAR REGilLATORY COMMISSION SOUTHERN CALIFORNIA EDISON COMPANY, ET AL.
DOCKET NOS. 50-361 AND 50-362 SAN ONOFRE NUCLEAR GENERATING STATION, UNITS 2 AND 3 i
ENVIRONMENTAL ASSESSMENT AND FINDING OF NO SIGNIFICANT IMPACT 1
1 I
The U. S. Nuclear Regulatory Commission (the Commission) is considering
.issuanceofamendmentstoFacilitjOperatingLicensesNo.NPF-10andNo.NPF-15 issued to Southern California Edison Company, San Diego Gas and Electric Company, the City of Riverside,' California and the City of Anaheim, California (the licensees), for operation of San Onofre Nuclear Generating Station, Units 2 and 3, located in San Diego County, California.
ENVIRONMENTAL ASSESSMENT J
Identification of Proposed Action:
The proposed amendments would revise Technical Specification 3/4.6.1.7, j
l
" Containment Ventilation System." This specification permits each 8-inch j
containment purge supply and exhaust isolation valve to be open for.less than 4
or equal to 1000 hours0.0116 days <br />0.278 hours <br />0.00165 weeks <br />3.805e-4 months <br /> (3000 hours0.0347 days <br />0.833 hours <br />0.00496 weeks <br />0.00114 months <br /> for Unit 3 prior to the third refueling 1
outage) per 365 days, and requires each 42-inch containment purge supply and exhaust isolation valve to be sealed closed, in operational modes 1, 2, 3 and 4.
The proposed change would revise Specification 3.6.1.7 to allow blind flanging the 8-inch or 42-inch containment purge supply and exhaust isolation valves as an acceptable method to close and/or seal closed the valves.
In addition, the l
proposed change would revise the current allowable period that the 8-inch contain-ment purge supply and exhaust isolation valves may be open, to permit unrestricted valve operation as required for specific safety related purposes. These QB2gg65090909 K 05000361 b,.
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i purposes would be defined as containment pressure control, ALARA and respirable air quality for personnel entry, and surveillance tests. The proposed change would also revise Action Statement 'a' of Specification 3.6.1.7 to increase the allowable time to close or blind flange an open valve from I hour to 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br />. Finally, the proposed change would exempt. blind flanges on the containment purge supply and exhaust lines from the 31-day inspection requirement and would include these blind flanges in the quarterly leakage rate test of the purge supply and exhaust isolation valves.
The Need for the Proposed Action:
The proposed amendments are required to limit the purposes for which the 8-inch containment purge supply and exhaust isolation valves may be opened during power operation, to provide flexibility in the methods of sealing the penetrations, and to clarify the surveillance requirements of the 42-inch valves.
Environmental Impacts of the Proposed Action:
The proposed actior 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 amendments do not significantly affect routine radiological plant effluer.ts. Therefore, the Commission concludes that there are no significant radiological environmental impacts associated with the proposed amendments. The Commission also concludes that the proposed action will not result in a significant increase in individual or cumulctive occupational radiation exposure.
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1 With regard to nonradiological impacts, the proposed amendments do not affect nonradiological plant effluents and have no other environmental impact.
Therefore, the Commission concludes that there are no significant nonradio-logical environmental impacts associated with the proposed amendments.
The Notice of Consideration of Issuance of Amendments and Opportunity for Hearing in connection with this action was published in the Federal Register onMay4,1989(54FR19271). No request for hearing or petition for leave to intervene w's filed following this notice.
a 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.
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, Units 2 and 3, dated April 1981 and its Errata dated June 1981.
Agencies and Persons Consulted:
The NRC staff has reviewed the licensees' request that supports the proposed amendments. The NRC staff did not consult other agencies or persons.
FINDING _0F NO SIGNIFICANT IMPACT The Commission has determined not to prepare an environmental impact statement for the proposed amendments.
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.
4-For further details with respect to this action, see the application for amendments dated May 25, 1988, and the revision to that request dated April 4, L
1989, which are 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 9th day of August, 1989.
FOR THE NUCLEAR REGULATORY COMMISSION
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/ /'.
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'AAnu eorge
. Knight ', Director Project Directorate V Division of Reactor Projects III, IV, Y and Special Projects Office of Nuclear Reactor Regulation
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