ML20203M779

Proposed Tech Spec Requiring Availability of Essential Svc Water Pump & Associated Valves of Shutdown Unit to Support Operating Unit.Significant Hazards Consideration Encl

ML20203M779
Person / Time
Site:	Byron
Issue date:	08/15/1986
From:	COMMONWEALTH EDISON CO.
To:
Shared Package
ML20203M778	List: ML20203M775 ML20203M779
References
1978K, NUDOCS 8609040307
Download: ML20203M779 (3)

Text

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ATTACISENT 1 i

PROPOSED CHANGE TO APPENDIX A TECHNICAL SPECIFICATIONS OF FACILITY OPERATING LICENSE NPF-37

,i Page: 3/4 7-12a f

l 8609040307 860815 DR ADOCK 05000454 PDR 1978K

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PLANT SYSTEMS 3/4.7.4 ESSENTIAL SERVICE WATER SYSTEM LIMITING CONDITION FOR OPERATION 3.7.4.1 A Unit 2 (Unit 1) Essential Service Water pump shall be available to support Unit 1 (Unit 2) operation.

APPLICABILITY: Unit 2 (Unit 1) in MODES 5 and 6 with Unit 1 (Unit 2) in MODES 1, 2, 3, and 4.

ACTION:

If neither Unit 2 (Unit 1) Essential Service Water pump is available, restore one pump to available status within 7 days or place Unit 1 (Unit 2) 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.following 30 hours3.472222e-4 days <br />0.00833 hours <br />4.960317e-5 weeks <br />1.1415e-5 months <br />.

SURVEILLANCE REQUIREMENTS 4.7.4.1 A Unit 2 (Unit 1) Essential Service Water pump shall be demonstrated available by manually starting and crosstieing to the Unit 1 (Unit 2) system:

a. At least once per day by verifying that:

1) Bus 241 (141) is energized if the 2A (lA) Essential Service Water pump is the available pump or Bus 242 (142) is oncrgized if the 2B (IB) Essential Service Water pump is the available pump, and

2) The following valves are open or capable of being operated from the Control Room:

a) SX001A, SX005, SX016A, SX027A, SX033, SX034 and SX143A if the A pump is the available pump, or b) SX001B, SX005, SX016B, SX027B, and SX143B if the B pump is the available pump.

b. At least once per 31 days, by running the available pump for 15 minutes.

BYRON - UNITS I and 2 3/4 7-12a 1978K

r ATTACHMENT 2 SIGNIFICANT HAZARDS CONSIDERATION Commonwealth Edison has evaluated this proposed amendment and determined that it involves no significant hazards considerations. According to 10 CFR 50.92(c), a proposed amendment to an operating license involves no significant hazards considerations if operation of the facility in accordance with the proposed amendment would not:

1) Involve a significant increase in the probability or consequences of an accident previously evaluated; or

2) Create the possibility of a new or different kind of accident from any accident previously evaluated; or

3) Involve a significant reduction in a margin of safety.

This proposed amendment is a new technical specification which requires the availability of an essential service water pump ar.d associated valves of a shutdown unit while the other unit is operating. The proposed amendment only addresses the probability and consequences of a loss of all essential service water. This event has not been previously evaluated. The probability or consequences of accidents which have been previously evaluated are not affected by requiring the availability of additional components in the essential service water system.

As stated above, the sole purpose of this amendment is to address loss of all essential service water. Loss of all essential service water is a new or different kind of accident which has not been previously evaluated. Instead of creating this accident, this proposed amendment minimizes the possibility of its occurrence.

Since this proposed amendment requires additional availability of components in the essential service water system, there is no reduction in any margin of safety.

Based on the preceeding assessment, Commonwealth Edison believes this proposed amendment involves no significant hazards considerations.

4 l

1978K

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