ML20042E038
| ML20042E038 | |
| Person / Time | |
|---|---|
| Site: | San Onofre  |
| Issue date: | 04/09/1990 |
| From: | Office of Nuclear Reactor Regulation |
| To: | |
| Shared Package | |
| ML20042E037 | List: |
| References | |
| NUDOCS 9004190066 | |
| Download: ML20042E038 (3) | |
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UNITED STATES 8
'4 NUCLEAR REGULATORY COMMISSION g
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WASHINGTON, D. C. 20555
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SAFETY EVALUATION BY THE OFFICE OF NUCLEAR REACTOR REGULATION 1
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RELATED TO AMENDMENT NO.7s T0 FACILITY OPERATING LICENSE NO. NPF-15 f
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SOUTHERN CALIFORNIA EDISON COMPANY SAN DIEGO GAS AND ELECTRIC COMPANY s
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THE CITY OF~ RIVERSIDE, CALIFORNIA THE CITY OF ANAHEIM,-CALIFORNIA-SAN ON0FRE NUCLEAR GENERATING STATION, UNIT NO.' 3 DOCKET NO. 50-362
1.0 INTRODUCTION
By letter dated February 12, 1990, Southern California Edison. Company, et I
al. (the licensee) requested a change to the Technical Specifications for Facility Operating License No. NPF-15 that authorizes operation of San.
Onofre Nuclear Generating Station, Unit No. 3 in San Di_ ego County, California..The licensee requested to revise Surveillance ~ Requirement 4.8.1.1.2.d of Technical Specification 3/4.8.1., "A.C. Sources." The proposed change would permit a one time extension during Cycle 4 operations from 24 months to 25 months of the surveillance' interval for Surveillance Requi_rement 4.8.1.1.2.d, which requires certain maintenance and ~ testing activities be performed. These activities would be_ performed once per refueling interval, which is nominally 24 months.
-2.0 EVALUATION The licensee requests this one time, one month surveillance _ interval extension during Cycle 4 operation in order to avoid a potentially signi-ficant impact on the schedule for the Cycle 5 refueling outage, which is scheduled to begin during April 1990. The surycillance requirement under review requires: extensive maintenance and testing be performed on~ the i
diesel generators on'a refueling interval (ncminal 24 months)-basis.
These activities include teardown and inspection, taking from 4 to 6 weeks to complete.
Schedule impact could occur since the specification surveillance interval for the "B" diesel generator could expire before the surveillance for "A" diesel generator can be completed.
The possibility exists for the "B" diesel generator to be declared administrative 1y inoperabic while the "A" diesel generator is inoperable for surveillance.-activities.
If this occurred, both diesel generate-s would be-considered inonerable, causing refueling activities (fuel movement)'to cease.
This administrative problem could occur as early as flay 17, 1990.
The licensee has requested the one month surveillance extension to preclude this possibility.
9004190066 900409 PDR ADOCK 05000362 P
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? 1 The licensee states that the effect of.a one month extension on a 24 month 1
interval would be minimal.
This extension increases:the surveillance-i interval approximately 4 percent.-. All other' diesel generator surveillances remain on their original schedules and serve to assure continued diesel i
generator operability.- Since the diesel _ generator must run at least once every 31 days,_ operability problems _ are generally identified during ;this.
run rather than during the refueling interval maintenance activities.
Moreover, other operability checks help ensure that the diesel generator remains operable. Additionally, the licensee states that there have been only three valid-test failures out of over 260 valid test runs, indicating-a 99 percent success record.
The staff-has determined that this extension would not significantly=,
affect'the capability of the diesel generators to perform their intended function. The diesel l generators are run at least every 31 days, which provides'a high degree of confidence that they are operable. Also, the staff agrees that the Cycle 5 refueling outage schedule could be adversely affected by an administratively inoperable diesel generator. lA one month extension of the refueling surveillance interval for inspection'and testing would have no adverse effect upon_the public health and-safety..
Therefore, based upon the information presented above, the staff approves the one time, one month extension during Cycle 4 operation of the Surveil-lance Requirement 4.8.1.1.2.d, effectively changing the surveillance interval from 24-to 25 months.
'3.0 CONTACT WITH STATE OFFICIAL The staff has advised the State Department of Health Services, State of California, of the proposed deternication of no significant hazards'
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t consideration. No comments were received.
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4.0 ENVIRONMENTAL CONSIDERATION
The amendment involve changes to requirements with respect to the installation or use of a facility compontnt located within the restricted area as defined in 10 CFR Part 20 or changes an inspection or. surveillance requirement.
The staff has determined that the amendments involve no L
significant increase in the amounts, and no significant'chango in.the types, of-any effluents that may-be released offsite and that there--is no significant increase in-individual or cumulative occupational radiation exposure. The Commission has previously issued a proposed finding that 1
the amendments involve no significant hazards consideration and there has been no public comment on'such finding. Accordingly, the amendments I
meet the eligibility criteria for categorical exclusion set forth in 10CFR51.22(c)(9).
Pursuant to 10 CFR 51.22(b) no environmental impact statement or environmental assessment need be prepared in connection with the issuance of these amendments.
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5.0 CONCLUSION
We have concluded, based on the considerations discusse.d above that:-(1) will not be endangered by operation in the proposed manner; (2) public there is reasonable assurance that the health and safety of the such-activities will be conducted in compliance with the Commission's regula-tions; and (3) the' issuance of the ameedients-will not be inimical to the common defense and security or to the heaith and safety-of the public.
Principal' Contributor:
Lawrence E. Kokajko Dated: April 9,.1990-t 1
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