ML20133B789
| ML20133B789 | |
| Person / Time | |
|---|---|
| Site: | San Onofre  |
| Issue date: | 09/25/1985 |
| From: | NRC |
| To: | |
| Shared Package | |
| ML20133B763 | List: |
| References | |
| TAC-56214, TAC-56219, NUDOCS 8510070111 | |
| Download: ML20133B789 (2) | |
Text
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SAFETY EVALUATION AMENDMENT NO. 34 TO NPF-10 AMENDMENT NO. 23 TO NPF-15 SAN ON0FRE NUCLEAR GENERATING STATION, UNITS 2 & 3 DOCKET NOS. 50-361 AND 50-362 Introduction Southern California Edison Company (SCE), on behalf of itself and the other licensees, San Diego Gas and Electric Company, the City of Riverside, California, and The City of Anaheim, California, has submitted several applications for license amendments for San Onofre Nuclear Generating Station, Units 2 and 3.
One such request, Proposed Change Number 142, or PCN-142, dated October 1, 1984, involves the onsite and offsite electrical power sources for the plant.
Specifically, the proposed change would revise Technical Specification 3/4.8.1.1, " Electrical Power Systems - AC Source - Operating", which defines the onsite and offsite power sources required to be available when the plant is operating in Modes 1-4.
Specification 3.8.1.1 requires the operability of two physically independent circuits between the offsite transmission network and the onsite Class IE distribution system when the plant is in Modes 1-4.
At San Onofre Units 2 and 3 the second source of offsite power is provided through the opposite unit's distribution system. Thus, for Unit 2, one of the two required sources of offsite power is supplied from Unit 2 itself through the Unit 2 reserve auxiliary transformers. The second source of offsite power for Unit 2 is provided through the Unit 3 reserve auxiliary transformers. Unit 3 meets the requirements for the independent offsite power sources in an analo'gous manner.
The proposed change would revise the surveillance requirenent of T.S.
4.8.1.1 and bases Section 3/4.8.8.1 to allow substitution of the unit auxiliary transformer for the reserve auxiliary transformers as a specific unit's source of offsite power, provided that the main generator disconnect links are removed, i.e. the unit is offline. Thus, with the proposed change, for Unit 2, one of the two required sources of offsite power would be supplied from Unit 2 itself through either the Unit 2 reserve auxiliary transfomers or the Unit 2 unit auxiliary transformer, provided that the Unit 2 main generator disconnect links are removed. The second source of offsite power would be provided through either the Unit 3 reserve auxiliary transformers or the Unit 3 unit auxiliary transformer provided that the Unit 3 nain gene-rator disconnect links are removed. An analogous situation would exist for Unit 3 with the proposed change. This change would result in additional flexibility in meeting the offsite power requirements when one or both units are offline.
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, Evaluation The NRC staff has reviewed the proposed change and has found it acceptable, because it meets the applicable acceptance criteria of NUREG-0800, the Standard Review Plan (SRP). Specifically, SRP Section 8.2, "Offsite Power System," requires two separate circuits from the offsite transmission network to the onsite Class 1E power distribution system, adequate physical and elec-trical separation, and system capacity and capability to supply power to all safety-related loads and other required equipment. The proposed change would allow use of an alternate installed path in providing the required circuits from the offsite transmission network to the onsite Class 1E distribution system. Physical and electrical separation and system capacity would be maintained. Therefore, the proposed change satisfies the SRP acceptance criteria and is a(.ceptable. Consequently, this amendment to the San Onofre 2 and 3 operating licenses incorporates the proposed change into the tech-nical specifications for each plant.
Contaci With 5 tate Official The NRC staff has advised the Chief of the Radiological Health Branch, State Department of Health Services, State of California, of the proposed detennina-tions of no significant hazards consideration. No comments were received.
Environmental Consideration These amendments involve changes in the installation or use of facility components located within the restricted area. The staff has determined that the amendments involve no significant change in the types or significant increase in the amounts 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 proposed findings that the amendments involve no significant hazards consideration, and there has been no public comment on such findings. Accordingly, the amendments meet the eligibility criteria for categorical exclusion set forth in 10 CFR Sec.
51.22(c)(9). Pursuant to 10 CFR 51.22(b) no environmental impact statement or environmental assessment needs to be prepared in connection with the issuance of these amendments.
Conclusion Based upon our evaluation of the proposed changes to the San Onofre Units 2 and 3 Technical Specifications, we have concluded that:
there is reasonable assurance that the health and safety of the public will not be endangered by operation in the proposed manner, and such activities will be conducted in compliance with the Commission's regulations and the issuance of the amend-ments will not be inimical to the common defense and security or to the health and safety of the public. We, therefore, conclude that the proposed changes are acceptable, and are hereby incorporated into the San Onofre 2 and 3 Technical Specifications.
Dated: September 25, 1985
ISSUANCE OF AMENDMENT NO.34 TO FACILITY OPERATING LICENSE NPF-10 l
AND AMENDMENT N0.23cT0 FACILITY OPERATING LICENSE NPF-15 SAN ON0FRE NUCLEAR GENERATING STATION, UNITS 2 AND 3 l
DISTRIBUTION Docket Fil'e 50-361/362 NRC PDR Local PDR PRC System NSIC LB#3 Readin J. Lee (20)g H. Rood T. Novak J. Saltzman, SAB L. Chandler, OELD C. Miles H. Denton J. Rutberg A. Toalston W. Miller, LFMB N. Grace E. Jordan L. Harmon D. Brinkman, SSPB T.Barnhart(4)
.