ML20052A172
| ML20052A172 | |
| Person / Time | |
|---|---|
| Site: | Calvert Cliffs  |
| Issue date: | 04/16/1982 |
| From: | Office of Nuclear Reactor Regulation |
| To: | |
| Shared Package | |
| ML20052A162 | List: |
| References | |
| NUDOCS 8204270521 | |
| Download: ML20052A172 (3) | |
Text
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UNITED STATES
[')
(3 g NUCLEAR REGULATORY COMMISSION j/; j W ASHINGTON, D. C. 20555 g.
%, *.dQ SAFETY EVALUATION BY THE OFFICE OF NUCLEAR REACTOR REGULATION SUPPORTINGAMENDMENTfj0.51 TO FACILITY OPERATING LICENSE NO. DPR-69 CALVERT CLIFFS NUCLEAR POWER PLANT UNIT NO. 2 DOCKET N0. 50-318
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Introduction:==
By application dated April 12, 1982 the Baltimore Gas and Electric Company (BG&E). requested a change to Calvert Cliffs Unit 2 Technical Specification (TS)3.7.6.lb. The proposed. changes would extend the maximum allowable period of inoperability for a control room. air conditioning unit from 7 to 21 days. The proposed change would be applicable for the period from April 17, 1982, to July 21, 1982, during which time Calvert Cliffs Unit 1.
would be shutdown.
Discussion:
TheCalhertCliffsControlRoomhentilationsystemconsistsofayear round air conditioning system serving both Units 1 and.2. Air. conditioning is required in the Control. Room.to regulate the temperature under which safety-related equipment must function. The. ventilation system is a redundant. system.and is. required to be operable at all times, except during shutdown and refueling by TS 3.7.6.1.
At the present time TS.3.7.6.lb allows a single air conditioning unit to be inoperable for up to 7 days.
The proposed change to TS 3.7.6.lb is required in order to undertake plant modifications as follows:
1.
In order to provide better working conditions for.the Operators.during the peak temperature periods in_the summer, the safety-related air conditioning system will be augmented with additional trains of air conditioning equipment. consisting of three chill water coils to be installed in existing ventilation.ductwork, two chill water pumps, and a 220-ton chiller unit.
Installation of this equipment, in addition, augments the capacity of the present safety-related. system servicing the Control Room and Cable Spreading Room equipment.
2.
Breakers will be installed on Unit 1 to supply power to.the Auxiliary Feedwater System third train..This modification is related.to connit.
ments made to the NRC.with regard to NUREG-0737 Item II.E.1.1, '.' Auxiliary Feedwater System Evaluation".
Installation of '.he breakers requires deenergizing the 4KV bus which supplies one control Room air condition-ing unit, l
820427057-l
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e J e The modificaitons described above will be coordinated such that one operable Control Room air conditioning unit will be maintained during MODES 1 through 4.
Projected scheduling and engineering completion. dates indicate the period from April 17, 1982 to July 21, 1982 should allow sufficient time for the completion of the modifications.
With regard to the operability of a single air conditioning unit, calcula-tions performed by BG&E. indicate that a single unit is sufficient to fully accomplish the design. objectives of the control room ventilation. system to limit the temperature in the control room to within ret 3uired bounds.
Based upon the above information and based upon the unlikelihood that the single operaule air conditioning unit will be required to perform its function under accident conditions, we find that neither the probabjlity nor the consequences of any accidents for which the control room ventilation system i
is assumed operable are more significan't. Accordincjly, it is appropriate' l
to amend TS 3.7.6.lb by adding the following:
l "For the period from April 17, 1982 to July 21, 1982, with Unit 1 in..
I Mode 5 and~6 and one air.conditionir.g unit. inoperable,. restore the-1 inoperable unit to OPERABLE status within 21 days or be in at least HOT STANDBY.within the next 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> and in COLD SHUTDOWN within the l
following 30 hours3.472222e-4 days <br />0.00833 hours <br />4.960317e-5 weeks <br />1.1415e-5 months <br />."
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(d)(4), that an environmental impact statement or negative declaration and environ-mental, impact appraisal need not be prepared in connect l1on with tne issuance of this amendment.
O
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 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 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:
April 16, 1982 Principal Contributor:
D. H. Jaffe e
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