ML17244A705
| ML17244A705 | |
| Person / Time | |
|---|---|
| Site: | Ginna  |
| Issue date: | 06/15/1979 |
| From: | Office of Nuclear Reactor Regulation |
| To: | |
| Shared Package | |
| ML17244A703 | List: |
| References | |
| NUDOCS 7907250319 | |
| Download: ML17244A705 (4) | |
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UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON, O. C. 20555 SAFETY EVALUATION BY THE OFFICE OF NUCLEAR REACTOR REGULATION SUPPORTING AMENDMENT NO.
27 TO PROVISIONAL OPERATING LICENSE NO.
DPR-18 ROCHESTER GAS AND ELECTRIC CORPORATION R;
E.
GINNA NUCLEAR PONER PLANT DOCKET NO. 50-244 1.0 Introduction Rochester Gas and Electric. Corporation (the licensee) in its submittal of tune 11, 1979, proposed certain-modifications to the safety injection actuation system logics for the R.
E. Ginna Nuclear Power Plant in response to Item 3 of IE Bulletin 79-06A dated
'pril 14, 1979.
Since the date of licensing until the issuance of IE Bulletin 79-06A
.safety injection was initiated, in addition to other parameters,
'ased on coincident trip of one-of-three matched pairs of low pressurizer level and low pressurizer pressure trips.
Item 3 of IE Bulletin 79-06A directed all facilities using pressurizer water level coincident with pressurizer pressure for automatic initiating of safety injection to trip the low pressurizer level setpoint bistables so that when pressurizer pressure reaches the low setpoint, safety injection would be initiated r egardless of the pressurizer level.
'2. 0 Because of the concern that this action has resulted in placing R.
E. Ginna Nuclear Plant in a condition (one-out-of-three trip) which is more susceptible to spurious actuation of the safety injection system, the licensee proposed modifications and Technical Specification changes to alleviate this situation.
Evaluation The proposed modifications to the safety injection actuation system consists of removing the pressurizer level signal from each of the pressurizer level/pressur e channel trips and converting the system to a two-out-of-three logic based on the pressurizer low pressure trips.
The instrumentation 1ogic receives pressurizer pressure signals from three pressure transmitters and initiates a safety injection actuation when two of the three signals reach the low pressure setpoint.
This modification does not involve a change 'in the setpoint.
These modifications will satisfy the requirements of IEEE 279-1971, and other applicable standards.
The modifications will be implemented with the plant in the shutdown condition.
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Based on our review of the licensee's submittal, we conclude that the modifications to the safety injection actuation system logic satisfy the requirements of IEEE 279-1971 and that the associated change in Technical Specifications are correct and, therefore; are acceptable.
3.0 Environmental Considerations 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 amend-ment involves an action which is insignificant from the standpoint of environmental impact and, pursuant to 10 CFR 551.5(d)(4), that an environmental impact statement or negative declaration and environmental impact appraisal need not be prepared in connection with the issuance of this amendment.
4.0 Conclusion We have concluded, based on the considerations, discussed
- above, that:
(1) because the amendment does not involve a significant increase in the probability or consequences of accidents previously considered and does not involve a significant decrease in a safe'ty 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 proposed
- 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 common defense and security or to the health and safety of the public.
Date of Issuance:
June 15, 1979
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