ML20134P213
| ML20134P213 | |
| Person / Time | |
|---|---|
| Site: | Hatch  |
| Issue date: | 08/27/1985 |
| From: | Office of Nuclear Reactor Regulation |
| To: | |
| Shared Package | |
| ML20134P194 | List: |
| References | |
| TAC-57308, NUDOCS 8509060197 | |
| Download: ML20134P213 (2) | |
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8 UNITED STATES
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NUCLEAR REGULATORY COMMISSION
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SAFETY EVALUATION BY THE OFFICE OF NUCLEAR REACTOR REGULATION SUPPORTING AMENDMENT NO. 52 TO FACILITY OPERATING LICENSE NO. NPF-5 GEORGIA POWER COMPANY OGLETHORPE POWER CORPORATION MUNICIPAL ELECTRIC AUTHORITY OF GEORGIA CITY OF DALTON, GEORGIA EDWIN I. HATCH NUCLEAR PLANT, UNIT NO. 2 DOCKET NO. 50-366 Evaluation By letter dated March 19, 1985 Georgia Power Company (GPC) requested changes to the Technical Specifications (TSs). These changes reflect the modifications to the automatic depressurization system (ADS) logic, by the addition of limiting conditions of operation and surveillance requirements for the " bypass" timers.
For transient and accident events which do not directly produce a high drywell pressure signal and are degraded by a loss of all high pressure injection systems, manual actuation of the ADS is required to provide adequate core cooling. The ADS logic is modified such that the drywell pressure permissive in the current logic is bypassed after a sustained low reactor water level (Level 1). The ADS will initiate when both the bypass timer and the existing ADS timer have expired. The licensee will reconsider a manual ADS inhibit switch as part of the resolution of the ATWS is"Je by
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October 1985.
General Electric performed the plant specific analyses to. determine the setting of the bypass timer for the ADS logic modification. The setting for the bypass timer is based on limiting the fuel peak cladding temperature of a transient or outside containment line break event to approximately 1500*F.
The limiting event is the main steam line break outside the containment.
General Electric Report, AE-52-0484, April 1984, presents the results of the analyses. The recomended setting for the bypass timer is 13 minutes and the proposed TS trip setpoint of < 13 minutes is consistent with this recomendation.
We have accepted this design modification as evaluated in our letters to GPC dated June 3, 1985 and June 5, 1985.
We find the proposed changes to the TSs acceptable.
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ENVIRONMENTAL CONSIDERATIONS The amendment involves a change in the installation or use of a facility component located within the restricted area as defined in 10 CFR Part 20 and g[OpD K
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s 2-1 changes in surveillance requirements. We have determined that thi amendment l
involves no significant increase in the amounts, 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 Comission has previously issued a proposed finding that the amendment involves no significant hazards consideration and there has been no public comment on such finding. Accordingly, the amendment meets the eligibi-lity 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 amendment.
Conclusion We have 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, and (2) such activities will be conducted in compliance with the Comission's regulations, and the issuance of the amendment will not be inimical to the comon defense and security or to the health and safety of the public.
Dated: August 27, 1985 Principal Contributor:
K. Desai 8
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