ML13331A534
| ML13331A534 | |
| Person / Time | |
|---|---|
| Site: | San Onofre  |
| Issue date: | 01/31/1991 |
| From: | Morgan H SOUTHERN CALIFORNIA EDISON CO. |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| Shared Package | |
| ML13331A533 | List: |
| References | |
| NUDOCS 9102040275 | |
| Download: ML13331A534 (3) | |
Text
BEFORE THE UNITED STATES NUCLEAR REGULATORY COMMISSION Application of SOUTHERN CALIFORNIA EDISON
)
COMPANY and SAN DIEGO GAS & ELECTRIC COMPANY
)
DOCKET NO. 50-206 for a Class 104(b) License to Acquire,
)
Possess, and Use a Utilization Facility as
)
Amendment Application Part of Unit No. 1 of the San Onofre Nuclear
)
No. 189, Supplement 2 Generating Station
)
SOUTHERN CALIFORNIA EDISON COMPANY and SAN DIEGO GAS & ELECTRIC COMPANY, pursuant to 10 CFR 50.90, hereby submit Amendment Application No. 189, Supplement 2.
This amendment application consists of supplemental information concerning Proposed Change No. 233, Revision 1, to Provisional Operating License No.
DPR-13. Proposed Change No. 233, Revision 1, modifies the Technical Specifications incorporated in Provisional Operating License No. DPR-13 as Appendix A to reflect modifications of the Safeguards Load Sequencing System (SLSS) that will be completed prior to restart from the current Cycle 11 refueling outage. In addition, a license condition is proposed to require installation of a plant modification to resolve a design deficiency related to automatic transfer capability between the vital bus electrical power sources.
Supplement 2 to this amendment application provides a setpoint/response time curve (Figure 3.5.1-1) for the 4160 volt bus undervoltage reactor trip instrumentation channels. The curve has been confirmed by recent tests on the associated relays presently installed in the plant.
Pt'-04)-7 9010'30-
-2 The SLSS modification and the license condition for installation of a plant modification to resolve a vital bus automatic transfer deficiency are necessary to satisfy single failure requirements. The SLSS modification consists of changes to the SLSS logic so that each sequencer will start and load its associated diesel generator and sequence safety-related electrical loads upon a safety injection signal (SIS) and concurrent loss of its respective 4160 volt electrical bus rather than upon a SIS and loss of both 4160 volt buses.
The proposed license condition requires installation of a plant modification during the Cycle 12 refueling outage to eliminate a vital electrical bus single failure susceptibility.
The additional information provided in this supplemental amendment application does not affect the significant hazards analysis of Proposed Change No. 233, Revision 1. Therefore, based on the significant hazards analysis provided in the Description and Significant Hazards Consideration Analysis of Proposed Change No. 233, Revision 1, it is concluded that (1) the proposed change does not involve a significant hazards consideration as defined in 10 CFR 50.92, and (2) there is reasonable assurance that the health and safety of the public will not be endangered by the proposed change.
SUP2AA.SN
-3 Subscribed on this 3 1 day of Aiju R -1
, 1991.
Respectfully submitted, SOUTHERN CALIFORNIA EDISON COMPANY By: -
a M
0 H. E. Morgan Q Vice President and Site Manager Subscribed and sworn to before me this
/ST-L day of ZAkl/IP J/
OFFICIAL SEAL RICHARD KERR DICKEY NOTARY PUBLIC - CALIFORNIA 010NGE COUNW Noty bMy com pire APR 9, 1991 State of California James A. Beoletto Attorney for Southern California Edison Company By:
Jeame
.Beoletto