ML20036C035
| ML20036C035 | |
| Person / Time | |
|---|---|
| Site: | Vogtle  |
| Issue date: | 06/02/1993 |
| From: | Office of Nuclear Reactor Regulation |
| To: | |
| Shared Package | |
| ML20036C034 | List: |
| References | |
| NUDOCS 9306080369 | |
| Download: ML20036C035 (2) | |
Text
[pna k UNITED STATES uq S
NUCLEAR REGULATORY COMMISSION U
WASHINoToN, D.C. 20E66 0001
\\ *****/ SAFETY EVALUATION BY THE OFFICE OF NUCLEAR REACTOR REGULATION RELATEd'TO AMENDMENT h0. ' 63 TO FACILITY OPERATING LICENSE NPF-68
~
AND AMENDMENT NO. o TO FACILITY OPERATING LICENSE NPF-81 GEORGIA POWER COMPANY. ET AL.
V0GTL ELECTRIC GENERATING PLANT. UNITS 1 AND 2 DOCKET NOS. 50-424 AND 50-425
1.0 INTRODUCTION
By letter dated April 8,1993, Georgia Power Company, et al. (the licensee) proposed license amendments to change the Technical Specifications (TS)~for Vogtle Electric Generating Plant (Vogtle or the facility), Units 1 and 2.
The proposed changes would revise the value of the peak containment pressure (P,)
calculated for design basis accidents. The value would be changed-from 45 psig to 37 psig in TS 4.6.1.1.c, 3.6.1.2.a, 3.6.1.2.b, 4.6.1.2.a, 4.6.1.2.d, 3.6.1.3.b, 4.6.1.3.a. and 4.6.1.3.b.
2.0 EVALUATION On March 22, 1993, the NRC issued Amendments 60 (Unit 1) and 39 (Unit 2) which modified the Vogtle Licenses and TS by increasing maximum core power level from 3411 megawatts thermal to 3565 megawatts thermal. To support these previous amendments, the_ licensee provided_ revised analyses-of design basis i
loss-of-coolant accidents (LOCAs) and main 5, team line break (MSLB) accidents.
The revised analyses benefited from several. changes, including a more accurate _
accounting of heat sinks inside containment, an improved mass and energy evaluation model (WCAP-10325-P-A), credit for'the full number of containment coolers required to be available by TS (4 of 8), and an initial containment pressure of 3.0 psig required by TS rather than 0.3 psig. The results showed.
that the highest P,36.5 psig -- a value below the containment design pressure would t;ccur for a LOCA rather than an MSLB and would reach a maximum value of of 52 psig. The NRC staff found the revised analyses acceptable in the Safety:
Evaluation. accompanying Amendmeats 60 and 39.
The calculated peak containment pressure is used for leak testing the containment, containment isolation valves, and containment penetrations, including the containment airlock, in accordance with 10 CFR 50 Appendix J.
The proposed changes to the TS would recognize the revised value of 36.5 psig, rounded up to 37 psig, as the basis for these tests.
On the basis of its previous review and acceptance of the revised analyses, as indicated in Amendments 60 and 39, the NRC staff finds the proposed changes acceptable.
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3.0 STATE CONSULTATION
In accordance with the Commission's regulations, the Georgia State official was notified of the proposed issuance of the amendments. The State official had no comments.
4.0 ENVIRONMENTAL CONSIDERATION
The amendments change requirements with respect to installation or use of a facility component located within the restricted area as defined in 10 CFR Part 20 and change surveillance requirements. The NRC staff has determined that the amendments involve no significant increase in the anounts, 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 amendments involve no significant hazards consideration, and there has been no public comment on such finding (58 FR 25856 dated April 28,1993). Accordingly, the amendments meet 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 amendments.
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 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 amendments will not be inimical to the common defense and security or to the health and safety of the public.
Principal Contributor: Darl S. Hood Date:
June 2, 1993 l
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