Difference between revisions of "ML20071C374"
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Latest revision as of 02:25, 27 March 2020
|Person / Time|
COMMONWEALTH EDISON CO.
|Download: ML20071C374 (4)|
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As a result of preoperational testing of CO2 discharge valve operation in the diesel generator rooms for Unit 1, it was determined that as much as 4,000 lbs. of CO2 would be discharged from the main tank and could result in a violation of.the current Technical Specifi-cation limit of 80 % (16,000 lbs.) out of a 10 ton (20,000 #) capacity tank during the preoperational test for the 28 diesel generator. A reduced required level would allow for system surveillance testing and generator hydrogen purging without violating Tech Spec limits.
Commonwealth Edison desires to reduce the required limit for minimum CO2 to 50%, a value currently used in the Technical Specifications for Dresden and Quad Cities Stations. Only 40% of the tank would be used in the event of two simultaneous Diesel Generator fires, an event which is beyond the requirements of the fire hazards analyses of FSAR Appendix H. This amount would still leave a 10% margin prior to reaching the proposed Technical Specification limit.
It should be noted that the preoperational test values are somewhat higher than design because of the incomplete construction sealing installed in these rooms at the time of the test. However, the test met all requirements of the Nuclear Mutual Limited Insurance Inspectors present during the test. Those values would be conservative when used to determine CO2 usage.
Conclusion Commonwealth Edison has reviewed this change based on the LaSalle FSAR, the System Design Specification, and the NFPA Code, and i determined that a 50% minimum level in the CO 2 tank will be adequate to fight the worst single fire (diesel generatorJ and safely shutdown the unit with loss of offsite power with more than an adequate reserve.
Commonwealth Edison Company therefore finds no unreviewed safety questions involved.
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PLANT SYSTEMS CO, SYSTEMS
LIMITING CONDITION FOR OPERATION 184.108.40.206 The following low pressure CO2 systems of Unit 1 and Unit 2 shall be OPERABLE.*
- a. Division 1 diesel generator 0 room.
- b. Division 2 diesel generator 1A room.
- c. Division 3 diesel generator 1B room.
- d. Unit 2 Division 2 diesel generator 2A room.
APPLICABILITY: Whenever equipment protected by the low pressure CO2 systems is required to be OPERABLE.
- a. With one or more of the above required low pressure CO2 systems inoperable, within one hour establish a continuous fire watch with backup fire suppression equipment for those areas in which redundant systems or components could be damaged; for other areas, establish an hourly fire watch patrol. Restore the system to OPERABLE status within 14 days or, in lieu of any other report required by Specification 6.6.B, prepare and submit a Special Report to the Commission pursuant to Specification 6.6.C within the next 30 days outlining the action taken, the cause of the inoperability and the plans and schedule for restoring the system to OPERABLE status.
- b. The provisions of Specification 3.0.3 and 3.0.4 are not applicable.
- a. At least once r 7 days by verifying CO2 storage tank level to be greater tha ' full and pressure to be greater than 290 psig, and 50 f>
- b. At least once per 31 days by verifying that each valve, manual, power operated, or automatic, in the flow path is in the correct position.
- c. At least once per 18 months by verifying:
- 1. The system valves and associated motor operated ventilation dampers actuate, manually and automatically, upon receipt of a simulated actuation signal, and
- 2. Flow from each nozzle during a " Puff Test."
- The normal or emergency power source may be inoperable in OPERATIONAL O CONDITION 4 or 5 or when defueled.
LA SALLE - UNIT 1 3/4 7-17
PLANT SYSTEMS FIRE HOSE STATIONS
' LIMITING CONDITION FOR OPERATION 220.127.116.11 The fire hose stations of Unit 1 and Unit 2 shown in Ta'ble 18.104.22.168-1 shall be OPERABLE. /
APPLICABILITY: Whenever equipment in the areas protected b the fire hose.
stations is required to be OPERABLE.
- a. With one or more of the fire hose station, shown in Table 22.214.171.124-1 inoperable, route an additional fire hosd of' equal or greater diameter to the unprotected area (s)/ zone (s) from'an OPERABLE hose station within 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> if the inoperable fire Jiose is the primary means of fire suppression; otherwise, route the additional hose within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />.
Restore the inoperable fire hose s,t'ation(s) to OPERABLE status within 14 days or, in lieu of any other prepare and submit a Special rtRepo,tepor' tt, ,he Commission required by Specification pursuant to 6.6.B.
Specification 6.6.C within thefnext 30 days outlining the action taken, the cause of the inoperability and the plans and schedule for restoring the system to 0PERABLE j status.
- b. The provisions of Specifications 3.0.3 and 3.0.4 are not applicable.
SURVEILLANCE REQUIREMENTS 126.96.36.199 Each of the above re/ quired fire hose stations shown in Table 188.8.131.52-1 shall be demonstrated OPERABLE:
- a. At least once,per 31 days by a visual inspection of the fire hose stations accpssible during plant operation to assure all required equipment ip at the station.
- b. At least once j per 18 months by:
- 1. Visual inspection of the fire hose stations not accessible during
. plant operation to assure all required equipment is at the station.
- 2. / Removing the hose for inspection and re-racking, and 3 .' Inspecting all gaskets and replacing any degraded gaskets in
,/ the couplings.
- c. At least once per 3 years by pa'rtially opening each' hose station valve to verify valve OPERABILITY and no flow blockage.
j II. Within 5 years and between 5 and 8 years after purchase date and at
'y least every 2 years thereafter by conducting a hose hydrostatic test at j a pressure of 150 psig or at least 50 psig above the maximum fire main operating pressure, whichever is greater.
LA SALLE - UNIT 1 3/4 7-18
ATTACHMENT B Status of-License Change-Requests Change Request Description- -Status NPF-ll/82-14 Rad Effluent Tech Specs revision Submitted to .
of reporting, etc. NRC 4-08-82.
Telecon 12/82 awaiting CECO resubmittal per agreement in telecon.
NPF-11/83-01 Add position of Project Manager Submitted to NRC 2-24-83.
NPF-ll/83-02 Revise CO2 tank-level. require- Submitted to ment NRC 2-24-83.
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