ML20135F887

SER Re Control Complex Dedicated Cooling Sys for post-fire Alternate Shutdown Capability.Design of Control Complex Dedicated Cooling Sys Meets Requirements of Section III.G.3 & Iii.L of 10CFR50 App R & Acceptable

ML20135F887
Person / Time
Site:	Crystal River
Issue date:	09/11/1985
From:	NRC
To:
Shared Package
ML20135F881	List: ML20135F878 ML20135F887
References
NUDOCS 8509180004
Download: ML20135F887 (2)

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SAFETY EVALUATION REPORT CONTROL COMPLEX DEDICATED COOLING SYSTEM FOR. POST-FIRE ALTERNATE SHUTDOWN CAPABILITY (APPENDIX R, SECTION III.G.3) -t l CRYSTAL RIVER, UNIT 3 I.

In our safety evaluation report input dated December 28, 1982 for the post-fire

alternate shutdown capability (Appendix R,Section III.G.3) for Crystal River, Unit 3, we noted that.the licensee had committed to provide a dedicated ventilation and cooling system for control complex equipment as an alternate i

to the normal control complex HVAC system. The control complex at Crystal River 3 is a building which houses the control room, cable spreading room and various electrical equipment rooms. This modification was required

! because a majority of the normal control complex HVAC system components (e.g.,

l fans, dampers, chilled water cooling units, etc.) are located in one fire area 4

(control complex, elevation 164'-0"). Further, the existing air handling system consists of a single duct feeding several' rooms in series containing redundant safe shutdown electrical equipment and therefore, closure of a single fire damper in response to a fire or single failure would result in the loss of-cooling air flow to these rooms. Thus, in order to ensure that areas within the l control complex containing required safe shutdown equipment can be adequately .

cooled in the event of a postulated fire, the licensee by lette? dated January 2, 1985 provided the conceptual design of a separate dedicated cooling j system in order to comply with the criteria of Appendix R. The following control complex areas will be served.by the dedicated cooling system:

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a. The'new remote shutdown room at el. 108'-0';-

Divisions A and B 4160V switchgear rooms at el. 108'-0";

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c. Divisions A and B inverter rooms at el. 108'-0;

d. Divisions A and B battery charger rooms at el, 108'-0";

e. Divisions A and B 480V switchgear rooms at el.l124'-0; and

f. Divisions'A, B. C, D emergency'.feedwater initiation and control (EFIC) '

room at el . 124'-0".

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2 l Each of the above control complex areas required for post-fire safe shutdown ,

is cooled by an individual fan coil cooling unit located in the respective  ;

areas. An air cooled chilled water unit including piping, circulating pump

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j and expansion tank located outside the control complex on the roof of the f j clean machine shop provides chilled water to each fan coil unit. The chilled [

] water piping is seismically supported within the control complex to ensure  !

that damage will not occur to safety-related equipment in a seismic event.

The system cooling capacity is designed to handle the total heat load of the

required shutdown equipment.

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Electrical power to the chilled water unit, circulating water pump and local  !

4 fan coil units will be provided from the essential onsite power sources. Manual control switches.and status indication for the chilled water unit circulating  ;

water pump and local fan coil units will be provided at a local control panel 1 j in the turbine building at el. 145' independent of areas where a fire may cause

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loss of the control complex normal HVAC system. In the even.t a fire disables i j the control complex normal HVAC system, the dedicated HVAC system will be l l started from its local control panel. Manual' initiation of the dedicated HVAC ,

will occur prior to exceeding temperatures.necessary to assure proper function j

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of the safe shutdown equipment. Emergency. lighting will be provided at this ,

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local control panel and along the access and egress routes to its location.. j i

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Based on the above, we conclude that the' design of the control complex  ;

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dedicated cooling system meets the requirements of Section III.G.3 and III.L of Appendix R and is, therefore, acceptable. Further, we reconfirm our.

previous conclusion in the January 6,1983 safety evaluation report input .!

regarding the acceptability of the. alternate shutdown capability at Crystal P.iver, Unit 3. r

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