ML15112A843
| ML15112A843 | |
| Person / Time | |
|---|---|
| Site: | Oconee  |
| Issue date: | 01/11/1979 |
| From: | Office of Nuclear Reactor Regulation |
| To: | |
| Shared Package | |
| ML15112A842 | List: |
| References | |
| NUDOCS 7901260050 | |
| Download: ML15112A843 (2) | |
Text
UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON, D. C. 20555 SAFETY EVALUATION BY THE OFFICE OF NUCLEAR REACTOR REGULATION SUPPORTING AMENDMENT NO. 67 TO FACILITY OPERATING LICENSE NO. DPR-38 AMENDIMENT NO. 67 TO FACILITY OPERATING.LICENSE NO. DPR-47 AMENDMENT NO. 64 TO FACILITY OPERATING LICENSE NO. DPR-55 DUKE POWER COMPANY OCONEE NUCLEAR STATION, UNITS NOS.
1, 2 AND 3 DOCKETS NOS.
50-269, 50-270 AND 50-287 Introduction By letter dated December 22, 1978, Duke Power Company (the licensee) requested a change to the Oconee Nuclear Station, Units Nos. 1, 2 and 3, Technical Specifications (TS). This change would extend the period of inoperability of a reactor building spray train from 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> to 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> before the reactor must proceed with a cooldown to the hot shutdown condition.
Evaluation The reactor building.spray system is a post loss-of-coolant accident (LOCA) heat removal system; no credit is taken for iodine removal.
The spray system consists of two independent trains of pumps, spray nozzle headers, and associated piping, valves and controls. Either independent spray train provides sufficient heat removal to perform the post LOCA reactor building heat removal function as described in the Final Safety Analysis Report (FSAR).- For similar systems in other operating nuclear plants, we have found that a period of inoperability of up to seven days for a single train is acceptable; the licensee requests a period of only 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> of inoperability. In addition to the heat removal capability of the spray system, the reactor building is equipped with a fan cooling system. The fan coolers provide sufficient heat removal capability so that even with both spray trains inoperable, the fan coolers alone maintain the containment pressure within the post-LOCA design limits of the Accident Analysis section of the FSAR. For the reasons stated above, we find the extension of the period of inoperability for a.
single spray train from 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> to 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> to be acceptable.
790126
-2 Environmental Consideration We have determined that these amendments do 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 amendments involve an action which is insiqnificant from the standpoint of environmental impact and, pursuant to 10 CFR §51.5(d)(4), that an environmental impact statement, or negative declaration and environ mental impact appraisal need not be prepared in connection with the issuance of these amendments.
Conclusion We have concluded, based on the considerations discussed above, that:
(1) because the amendments do not involve a significant increase in the probability or consequences of accidents previously considered and do not involve a significant decrease in a safety margin, the amendmentsdo. 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 proposed manner, and (3) such activities will be conducted in compliance with the Commission's regulations and the issuance of theseamendmentiwill not be inimical to the common defense and security or to the health and safety of the public.
Dated:
January 11, 1979