ML13309A369
| ML13309A369 | |
| Person / Time | |
|---|---|
| Site: | San Onofre  |
| Issue date: | 12/29/1992 |
| From: | Office of Nuclear Reactor Regulation |
| To: | |
| Shared Package | |
| ML13309A366 | List: |
| References | |
| NUDOCS 9301060182 | |
| Download: ML13309A369 (3) | |
Text
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UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON, D.C. 20555 SAFETY EVALUATION BY THE OFFICE OF NUCLEAR REACTOR REGULATION RELATED TO AMENDMENT NO. 152TO FACILITY OPERATING LICENSE NO. DPR-13 SOUTHERN CALIFORNIA EDISON COMPANY SAN DIEGO GAS AND ELECTRIC COMPANY SAN ONOFRE NUCLEAR GENERATING STATION, UNIT NO. 1 DOCKET NO. 50-206
1.0 INTRODUCTION
By letter of October 29, 1992, Southern California Edision Company submitted a request for a change to the San Onofre Nuclear Generating Station (SONGS),
Unit No. 1, Technical Specifications (TS).
The request would delete diesel generator automatic start capability requirements in Modes 5 and 6 (cold shutdown and refueling, respectively) from Technical Specification 3.7.2.b of the San Onofre, Unit 1, thus eliminating the need to perform Surveillance Requirement 4.4.F.1 for the required diesel generator.
2.0 EVALUATION San Onofre Unit 1 is permanently shutdown and is expected to be defueled by March 1993. The licensee has proposed the following TS change regarding diesel generator surveillance testing while in Modes 5 and 6.
Technical Specification 3.7.2.b currently requires that one diesel generator which is capable of automatic start shall be operable with a total connected design load not to exceed 6,000 kw to ensure that the station can be maintained in the shutdown or refueling conditions (Modes 5 and 6) for an extended period of time if offsite power is lost. Corresponding Surveillance Requirement 4.4.F.1 provides surveillance to ensure operability of diesel generators and the Safeguards Loads Sequencing Systems during shutdown.
According to current TS 3.7.2.b, Surveillance Requirement 4.4.F must be performed for the required available diesel generator to demonstrate automatic start capability and operability of the diesel generator in Modes 5 and 6.
The licensee has proposed to delete reference to the automatic start requirements for the required available diesel generator from TS 3.7.2b during cold shutdown and refueling conditions thus eliminating the need to perform diesel generator Surveillance Requirement 4.4.F.1.
The tests described in Surveillance Requirement 4.4.F.1 are performed to demonstrate the capability of the diesel generator for automatic start and load during a simulated occurrence of Safety Injection System Signal concurrent with Loss of Offsite Power Signal (SISLOP). The licensee has concluded that this equipment is no longer needed because of the permanent shutdown of SONGS 1. Therefore, 9301060182 921229 PDR ADOCK 05000206 P
-2 performing Surveillance Requirement 4.4.F.1 in Modes 5 and 6 constitutes an unnecessary burden.
The staff agrees that the automatic start capability of the diesel generator on the SISLOP signal in Modes 5 and 6 after the permanent shutdown of SONGS 1 is not necessary because the operability of the ECCS equipment, with the exception of RHR, would not be required. In Modes 5 and 6, the diesel generators are only required for decay heat removal, therefore, the only event with any possible impact is the loss-of-decay heat removal.
The diesel generators are loaded manually by operator actions for decay heat removal in Modes 5 and 6 because adequate time is available for the operator to initiate heat removal in these modes.
The diesel generator will still start automatically on a loss of voltage.
Additionally, the operability of the diesel generator would be demonstrated at least monthly by performance of Surveillance Requirement 4.4.B which includes a full load test. The other required maintenance of the diesel generators will also be performed.
The above will provide assurance that the diesel generator will be well maintained and perform its safety function when required and, therefore, the staff finds the proposed TS change to be acceptable.
3.0 STATE CONSULTATION
In accordance with the Commission's regulations, the California State official was notified of the proposed issuance of the amendment. The State official had no comments.
4.0 ENVIRONMENTAL CONSIDERATION
The amendment changes a requirement with respect to the installation or use of a facility component located within the restricted area as defined in 10 CFR Part 20 and changes surveillance requirements. The NRC staff has determined that the amendment involves no significant increase in the amounts, and no significant change 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 the amendment involves no significant hazards considera tion, and there has been no public comment on such finding (57 FR 55591).
Accordingly, the amendment meets the eligibility criteria for categorical exclusion set forth in 10 CFR 51.22(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 the amendment.
5.0 CONCLUSION
The Commission has concluded, based on the considerations discussed above, that (1) there is reasonable assurance that the health and safety of the
-3 public will not be endangered by operation in the proposed manner, (2) such activities will be conducted in compliance with the Commission's regulations, and (3) the issuance of the amendment will not be inimical to the common defense and security or to the health and safety of the public.
Principal Contributor: Om Chopra Date: December 29, 1992