ML19332G029

Proposed Tech Spec 3/4.7 Bases Re Svc Water Sys,Control Room Emergency Filtration Sys,Shore Barrier Protection,Rcic & UHS

ML19332G029
Person / Time
Site:	Fermi
Issue date:	12/15/1989
From:	DETROIT EDISON CO.
To:
Shared Package
ML19332G028	List: ML19332G029 NRC-89-0269, Forwards Revised Tech Spec Page B 3/4 7-1 Bases Re UHS to Reflect Surveillance Requirement 4.7.1.5.b.2
References
NUDOCS 8912200052
Download: ML19332G029 (2)

Text

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3/4.7 PLANT SYSTEMS BASES 3/4.7.1 SERVICE WATER SYSTEMS The OPERABILITY of the service water systems ensures that sufficien't cooling  ;

capacity is available for continued operation of safety-related equipment during '

normal and accident conditions. The redundant cooling capacity of these systems, assuming a single failure, is consistent with the assumptions used in the accident conditions within acceptable limits, q_ I/R5ER 3/4.7.~2 CONTROL ROOM EMERGENCY FILTRATION SYSTEM The OPERABILITY of the control room emergency filtration system. ensures that (1) the ambient air temperature does not exceed the allowable temperature for continuous duty rating for the equipment and instrumentation cooled by this system and (2) the control room will remain habitable for operations personnel during and following all design basis accident conditions. Continuous operation j of the system with the heaters OPERABLE for 10 hours1.157407e-4 days <br />0.00278 hours <br />1.653439e-5 weeks <br />3.805e-6 months <br /> during each 31-day period i is sufficient to reduce the buildup of moisture on the adsorbers and HEPA filters.

The OPERABILITY of this system in conjunction with control room design provisions is based on limiting the radiation exposure to personnel occupying the control room to 5 rem or less whois body, or its equivalent. This limitation is con-sistent with the requirements of General Design Criterion 19 of Appendix A, 10 CFR Part 50.

3/4.7.3 SHORE BARRIER PROTECTION I The purpose of the shore barrier is to protect the site backfill from wave erosion.

Category 1 structures are designed to withstand the impact of waves up to 5.4 feet. So long as the backfill is in place, waves greater than 5.4 feet cannot impact Category 1 structures because of the lack of sufficient depth of water to sustain such waves.

The shore barrier can sustain a high degree of damage and still perform its function, protecting the site backfill from erosion. Thus the operability condition for operation of the shore barrier has been written to ensure that severe damage to the structure will not go undetected for a substantial period of time and provide for prompt NRC notification and corrective action.

3/4.7.4 REACTOR CORE ISOLATION COOLING SYSTEM

- The reactor core isolation cooling (RCIC) system is provided to assure [

adequate core cooling in the event of reactor isolation from its primary heat ')^

sink and the loss of feedwater flow to the reactor vessel without requiring actuation of any of the Emergency Core Cooling System equipment. The RCIC system is conservatively required to be OPERABLE whenever reactor pressure exceeds 150 psig. This pressure is substantially below that for which the low pressure core cooling systems can provide adequate core cooling for events requiring the RCIC system.

The RCIC system specifications are applicable during OPERATIONAL CONDITIONS 1, 2, and 3 when reactor vessel pressure exceeds 150 psig because RCIC is the

, primary non-ECCS source of emergency core cooling when the reactor is pressurized.

f-FERMI - UNIT 2 B 3/4 7-1 l 8912200002 891215 DR ADOCK0500ggi

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l Bases Insert The Ultimate Heat Sink consists of two 50% capacity Besidual Heat  !

Removal (RHR) reservoirs which nust be capable of being cross-connected. Surveillance Requirenent 4.7.1.5.b.2 assures that i the ability to cross-connect the two reservoirs is not conpromised in 1 the event of a failure of a single electrical power source. I 1

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