ML19257A083
| ML19257A083 | |
| Person / Time | |
|---|---|
| Site: | Calvert Cliffs  |
| Issue date: | 12/11/1979 |
| From: | Office of Nuclear Reactor Regulation |
| To: | |
| Shared Package | |
| ML19257A079 | List: |
| References | |
| NUDOCS 8001020072 | |
| Download: ML19257A083 (2) | |
Text
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SAFETY EVALUATION BY THE OFFICE OF NUCLEAR REACTOR REGULATION SUPPORTING AMENDMENT N0. 24. TO FACILITY OPERATING LICENSE NO. DPR-69 BALTIMORE GAS AND ELEClRIC COMPANY CALVERT CLIFFS NUCLEAR POWER PLANT, UNIT N0. 2 DOCKET N0. 50-318 Introduction By application dated August 27, 1979, and supplemental information dated October 1,1979, Baltimore Gas and Electric Company (BG&E or the licensee) requested an amendment to Facility Operating License No. DPR-69 for the Calvert Cliffs Nuclear Power Plant, Unit No. 2 (CCNPP-2).
The amendment request consisted of changes to the Technical Specifications (TS) increasing the measurement / calculational uncertainties for peaking factors F and F from r
q 5.1 and 5.8 percent to 6.0 and 7.0 percent, respectively.
Discussion and Evaluation In the CCNPP-2 Cycle 2 analysis performed for BG&E by Combustion Engineering (CE), measurement / calculational uncertainties of 5.1 and 5.8 percent for Fr and F were used. These uncertainties had previous values of 8 and 10 percent.q Because of unanswered questions, the NRC staff could not approve the proposed change in values of these uncertainties.
BG&E and CE proposed two modes of operation:
(1) load following operation where the 8 and 10 percent uncertainties would apply; and (2) non-load following operation where the lower uncertainties would apply.
Using this approach, they were able to identify conservatisms in the safety analysis methodology where no credit was taken.
Our evaluation of the acceptability of taking credit for these conservatisms is documented in the Cycle 2 reload Safety Evaluation of October 21, 1978.
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As a result of meetings between the NRC staff and CE prior to and during our review of the Cycle 4 reload analysis for CCNPP-1, uncertainties of 6 and 7 percent for F and F, respectively, were found to be acceptable for all modes of operation.r This ks documented in our Safety Evaluation of June 14, 1979.
from 5.1 to 6 percent The requested change, increasing the uncertainty of Fr and F fron 5.8 to 7 percent during normal (non-load follow) operation, is q
in the conservative direction, i.e., increases the constraints on plant operation.
However, for load following operation, a mode not planned for use at CCNPP, the reduction in the uncertainty of Fr fron 0 to 6 percent and F from 10 to 7 q
percent would be less conservative.
Since this requested change for CCNPP-1 was 8001020 ggg found acceptable (June 14, 1979, Safety Evaluation) and is fully applicable for Unit No. 2, we conclude that the same change is acceptable for CCNPP-2.
Environmental Consideration We have determined that the amendment does not authorize a change in effluent types'or total amounts nor an increase in power level and will not result in any significant environmental impact. Having made this determination, we have further concluded that the amendment involves an action which is insignificant from the standpoint of environmental impact and, pursuant to 10 CFR 551.5(c)(4), that an environmental impact statement, or negative declaration and environ-mental impact appraisal need not be prepared in connection with the issuance of this amendment.
Conclusion We have concluded, based on the considerations discussed above, that:
(1) because the amendment does not involve a significtnt increase in the probability or consequences of accidents previously considered and does not involve a significant decrease in a safety margin, the amendment does not involve a significant hazards consideration, (2) there is reasonable assurance that the health and safety of the public will not be endangered by operation in the progosed manner, and (3) such activities will be conducted in compliance with the Commission's regulations and the issuance of this amendment will not be inimical to the commor, defense and security or to the health and safety of the public.
Dated: December 11, 1070 1665 164
.