ML13326A850
| ML13326A850 | |
| Person / Time | |
|---|---|
| Site: | San Onofre  |
| Issue date: | 05/01/1992 |
| From: | Ray H Southern California Edison Co |
| To: | |
| Shared Package | |
| ML13326A849 | List: |
| References | |
| NUDOCS 9205040222 | |
| Download: ML13326A850 (4) | |
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. 205 Generating Station SOUTHERN CALIFORNIA EDISON COMPANY and SAN DIEGO GAS & ELECTRIC COMPANY, pursuant to 10 CFR 50.90, hereby submit Amendment Application No. 205.
This amendment application consists of Proposed Change No. 255 to the Unit 1 Facility Operating License No. DPR-13.
Proposed Change No. 255 modifies the Technical Specifications, incorporated in Facility Op'erating License No.
DPR-13 as Appendix A. The proposed change will revise Technical Specification 3.9, "MODERATOR TEMPERATURE COEFFICIENT (MTC);" Specification 3.3.3, "MINIMUM BORON CONCENTRATION IN THE REFUELING WATER STORAGE TANK (RWST)
AND SAFETY INJECTION (SI) LINES AND MINIMUM RWST WATER VOLUME;" and Specification 3.5.2, "CONTROL ROD INSERTION LIMITS."
The proposed change is necessary to ensure that all accidents, including the Main Steam Line Break (MSLB) accident, are conservatively bounded by the Moderator Temperature Coefficient (MTC) Technical Specifications. The need for the change was identified following the recent discovery of an inconsistency between the stated basis for the MTC in the current Technical Specification and the methodology employed by Westinghouse for SONGS 1 accident analysis.
PDR ADOCIK 0500020
-2 Based on the significant hazards analysis provided in the "Description and Significant Hazards Consideration Analysis" of Proposed Change No. 255, 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.
3 Subscribed on this /
day of
/Ly.
, 1992.
Respectfully Submitted, SOUTHERN CALIFORNIA EDISON COMPANY By:
Har 1d B. Ray Senior Vice Presi t
Subscribed and sworn to before me this
/ST day of 44A'
, 1992.
ag AL MRAAAR A MC CARTHY Notary Public in and for the State of California James A. Beoletto Attorney for Southern California Edison Company By:
Ja A. eo etto\\
DESCRIPTION AND SIGNIFICANT HAZARDS CONSIDERATION ANALYSIS OF PROPOSED CHANGE NO. 255 TO THE TECHNICAL SPECIFICATIONS FACILITY OPERATING LICENSE NO. DPR-13 This is a request to revise the following sections of the Technical Specifications for San Onofre Nuclear Generating Station, Unit 1 (SONGS 1):
Specification 3.9, "MODERATOR TEMPERATURE COEFFICIENT (MTC);"
Specification 3.3.3, "MINIMUM BORON CONCENTRATION IN THE REFUELING WATER STORAGE TANK (RWST) AND SAFETY INJECTION (SI) LINES AND MINIMUM RWST WATER VOLUME;" and Specification 3.5.2, "CONTROL ROD INSERTION LIMITS."
The purpose of this proposed change is to ensure that the MTC Technical Specification bounds all accidents, including the Main Steam Line Break (MSLB). This will be accomplished by revising the Technical Specification values for the most negative MTC limit, the safety injection line minimum boron concentration limit, and the minimum shutdown margin limit.
EXISTING TECHNICAL SPECIFICATIONS See Attachment 1 PROPOSED TECHNICAL SPECIFICATIONS See Attachment 2.
DESCRIPTION OF CHANGES A reduction in the current end-of-cycle MTC limit in Technical Specification 3.9 is necessary to resolve an existing inconsistency between the Basis for MTC stated in the Technical Specification and the MSLB accident analysis for SONGS 1. To accommodate the revision to the MTC value, changes are also necessary to Technical Specification limits for safety injection (SI) line minimum boron concentration (Technical Specification 3.3.3), and shutdown margin (Technical Specification 3.5.2). These proposed changes are described in detail in the following sections.
CHANGES TO SPECIFICATION 3.9 The current Technical Specification 3.9(a) requires that the MTC for all rods withdrawn, end-of-cycle life, and the rated thermal power condition be less negative than -3.8 x 10-4 Ak/k/OF. Actions are required to be taken if this 1