ML13316A765
| ML13316A765 | |
| Person / Time | |
|---|---|
| Site: | San Onofre  |
| Issue date: | 11/23/1984 |
| From: | Office of Nuclear Reactor Regulation |
| To: | |
| Shared Package | |
| ML13316A764 | List: |
| References | |
| DPR-13-A-056-ER, DPR-13-A-56-ER, TAC-56067 NUDOCS 8411270304 | |
| Download: ML13316A765 (1) | |
Text
-2 This use of a 0.2 partial power multiplier for peaking factors at lower powers has historically been used for Westinghouse reactors. It has been used in the analysis of the last 3 cycles for San Onofre 1 but has never been incorporated into the basis of the Technical Specification. We have approved of the use of this kind of relationship for years and find this change for San Onofre 1 acceptable.
Non-LOCA The original Cycle 8 analysis had a 4.4% margin in DNBR which is more than enough to accommodate the change-in DNBR due to the change from 1.55 to 1.57 in F H. With F H = 1.57 there is still a 1% margin in DNBR. Thus the safety analysis design basis DNBR is met with the increased FNH. The reactor core thermal and hydraulic safety limits were evaluated for tAe effect of increased F H limit. It was determined that the reactor core safety limits AH N
were not changed. The only effect of increased F 0 on non-LOCA accident analyses was the effect'on DNBR. Since the decrease in DNBR was accommodated by the reduction in available DNBR margin, the previous non-LOCA accident analyses remain valid.
LOCA The input values for the current small break LOCA analysis imply an enthalpy rise peaking factor of approximately 1.95. The current large break LOCA analysis assumed an enthalpy rise peaking factor of 1.75. Thus the current large and small break LOCA analyses remain applicable for an enthalpy rise peaking factor of 1.57 and no further LOCA analyses were required.
Conclusion Based on the review of the licensee's submittal and additional information submitted by the licensee the staff concludes that the proposed change to the F AH limits in the Bases of Technical Specification 3.5.2 is acceptable.
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