ML20039G389

Proposed Tech Specs Clarifying Limiting Conditions for Shutdown Board Room Cooling Sys

ML20039G389
Person / Time
Site:	Sequoyah
Issue date:	12/14/1981
From:	TENNESSEE VALLEY AUTHORITY
To:
Shared Package
ML20039G385	List: ML20039G384 ML20039G389
References
NUDOCS 8201180140
Download: ML20039G389 (15)

Text

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ENCLOSURE 1 PLANT SYSTEMS ' '

3/4.7.13 SHi""DOWN BOARD ROOM COOLING SYSTEM LIMITING CONDITION FOR OPERATION 3 7.13 At least two independent shutdown board room cooling systems shall be operable.

APPLICABILITY: Modes 1,2,3, and 4.

ACTION:

With one shutdown board room cooling system operable, restore the inoperable cooling system to operable status within 7 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 following 30 hours3.472222e-4 days <br />0.00833 hours <br />4.960317e-5 weeks <br />1.1415e-5 months <br />.

SURVEILLANCE REQUIREMENTS 4.7.13 Each train of the shutdown board room cooling system shall be demonstrated operable quarterly by:

a. Verifying that the system operates continuouslygfor A 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> and maintains each shutdown board room at dE104 F.

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ENCLOSURE 2 JUSTIFICATION The shutdown boards are separated into two subaceas (rooms) corresponding to train A and train B emergency power. Following an accident, the boards in either subarea have the capability for safe shutdown of the unit. The attendant air handling equipment consists of two 100 percent capacity air conditioning units--one for each subarea. Either air conditioning unit can remove 100 percent of the heat produced by electrical equipment in either subacea. Therefore, the air handling system provides redundant cooling I

capacity to the shutdown boards. The action statement associated with the

• proposed technical specification addition will allow maintenance and testing of the redundant air conditioning unit while maintaining safe shutdown capability with the other cooling unit operating.

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~ SNP-68 s Radiation mon'itors are calibrated and tested periodically using a calibrated check source to verify the instruments response and alarm functions. Thermo-stats and smoke detectors are tested periodically..

The battery rooms sentilating system is in continuous operation, and the ex-haust fans are accessible for periodic inspection.

The air-conditioning system filter cells shall have their filtering media re-placed upon a resistance buildup to 1-inch water gauge static pressure differ- .

ential. -

Environnental conditions vary only slightly under normal operation and simulated conditions should be such as to prove design conditions.

9.4.2 AUXILIARY BUILDING 9.4.2.1 Design Bases The auxiliary building ventilating systems serve all areas of the auxiliary building including the radwaste areas and the- fuel handling area. Separate subsystems are utilized for the environmental control of the shutdown board rooms, auxiliary board rooms, and other miscellaneous rooms and laboratories.

The ventilating systems also incorporate individual cubicle coolers to provide supplementary cooling to specific safety feature equipment.

The auxiliary building ventilating systems are designed to maintain acceptable

([ environmental conditions for personnel access, operation, inspection, mainte-nance, testing and protection of mechanical and electrical equipment, and controls.

and to limit the release of radioactivity to the environment during all weather 35 conditions. These building environmental control systems are designed to maintain l .

all building temperatures (except steam valve rooms) between 60 F minimum --

and 110 F maximum during outdoor design temperatures ranging from 15 F in- 58~

winter to 97 F in summer. The steam valve rooms are maintained between 80 F and 120 F.

The shutdown board, auxiliary control and battery board rooms at El 734, and the auxiliary board, and battery rooms at El 749 are cooled by mechanical

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refrigeration. These air-conditioning systems are designed to limit maximum 34 room temperatures to less than 80 F DB and 68 F WB. The shutdown board room, and auxiliary control room at El 734 are maintained at approximately 75 F DB and 50 percent relative humidity. .

The auxiliary building is considered divided into four separately controlled l68 and isolated types of areas as follows:

1. The fuel-handling area at El 734; the penetration rooms at El 734 and l34 i

El 759; and the fuel, waste, and cask handling areas at El 706 and El 669.

2. The general building and penetration room areas at El 653, El 669, El 690, and El 714. .

. .?'. 3. The shutdown board, a'uxiliary control, and battery board rooms at El 734.0, and auxiliary board room and battery rooms at El 749.0. 34 J'

4. The shutdown board transformer rooms'at El 749.

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To control airborne activity, the ventilation air is supplied to clean areas, e then routed to areas of progressively greater contamination potential. Areas ..

of the building which are subject to radioactive contamination are maintained l at a slight negative pressure to limit outleakage. In addition, the system has the capability of isolating the contaminated areas from the outdoors.

56 l All exhaust air is routed through a duct system, and is discharged into the auxiliary building exhaust stack which is located atop the auxiliary building, and extends a distance of 43 feet above the roof.-

34 Two 100 percent capacity gas treatment system filter trains, consisting of pre and HEPA filters and carbon adsorbers, are provided for operation upon indication of high radiation in the exhaust air from auxiliary building potentially contaminated areas or upon an isolation signal from either reactor unit. The filter trains are automatically energized and a reduced quantity of building exhaust is diverted through the filter trains and discharged into the shield building exhaust vent. This is located within the annulus space of the reactor building and extends to the top of the reactor building.

9.4.2.1.1 Auxiliary Building Gas Treatment System ,

34 The auxiliary building gas treatment system is discussed in Subsection 6.2.3. ,

9.4.2.2 System Description I

The auxiliary building ventilation systems are shown on Figures 9.4-4, 9.4-5, 9.4-6, and 9.4-19. Logic and Control is shown on Figures 9.4-7 through gjg 60 9.4-12.

The auxiliaty building ventilation and cooling systems consist of the following subsystems:

1. Building air supply and exhaust system (general ventilation).

2. Building cooling system (chilled water).

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3. Safety feature equipment coolers.

4. Shutdown board room air-conditioning system.

5. Auxiliary board room air-conditioning system. ,

6. Shutdown transformer room ventilation system.

7. Miscellaneous ventilation and air-conditioning systems.

9.4.2.2.1 Building Air Supply and Exhaust Systems (General Ventilation)

The supply system filters 100 percent of outdoor air through a bank of filters for each of two mechanical equipment rooms located at opposite ends of the building at El 714.0. The filters have a nominal efficiency of 85 percent based on the NBS atmospheric dust spot test. ,{,3

! 9.4-10 March 2, 1979

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During periods when the outdoor air temperature is below 40 F, 240 F hot '

water is supplied to hearing / cooling air intake coils to temper the in-coming air. ,

J During periods when outdoor ambient temperature is above 60 F, chilled water is supplied to heating / cooling air ' intake coils to increase cool- I ing capacity of ventilation air. Between outdoor temperatures of 40-60 F, unconditioned air is supplied. The auxiliary building general ventila- [

tion system controls are designed to maintain building temperature between J 80 F and 104 F during the summer.

The heating / cooling coils are composed of 12 coil sections arranged in 4 banks with 3 coils in each bank. The coils are sized to heat approxi-mately 200,000 cfm of outdoor air from 0 F to 60 F when supplied from i Turbine Building heating system with 240 F hot water. The coils have the capability to cool 200,000 cfm of outdoor air from 97 F to 85 F when supplied from one of the general cooling system water chilling machines with 72 F chilled water. -

The air supply system utilizes four 50 percent capacity supply fans with two located in each of the two mechanical equipment rooms at El 714.0.

During normal operation, one fan in each equipment room is in operation '

with the other fan in the standby mode.

Fan inlet dampers are used to reduce the volume of supply air during low outdoor temperature conditions to conserve heat. Supply air is ducted to various clean or accessible areas of the auxiliary building and fuel handling areas from where it flows f

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1 1) 9.4-10a September 29, 1976

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to areas of progressively greater contamination potential before being ex-hausted through a duct system by the building exhaust fans. l 34 The building supply fans are belt-driven centrifugal type located downstream of the heating / cooling coils. Each fan is rated at 100,000 cfm at 5.75-inch water gauge static pressure. Each fan is driven by a nominal 150-hp motor. 34 l These fans are not ESF equipment and are not energized from emergency power. l The building supply filters are composed of 2 banks with 87 individual filter cells per filter bank. Each filter bank is rated at 85 percent efficiency l 34 8 based on NBS atmospheric dust spot test.

Manually adjustable modulating type fan inlet dampers rze used to reduce volume of supply air. 34 The general exhaust from the Auxiliary Building is provided by four exhaust fans each rated at 50 percent of system capacity. These fans are controlled in blocks of two; during normal operations one fan is in operation and the remaining fan is 56 in the standby mode. These fans are located on the roof of the Auxiliary Building and discharge into the auxiliary building exhaust vent.

Air utilized to ventilate the fuel handling area, vaste packaging, and cask a shipping area is exhausted by the fuel handling area exhaust fans. An l 56 exhaust duce system from the waste packaging area and cask loading area is connected to a duct system around the periphery of the opent fuel pit and fuel transfer canal. Thus, exhaust air from the fuel handling area passes l 34 across the spent fuel pit forming an air curtain across the pool. Two 100 percent capacity fuel handling exhaust fans are provided. During normal operation one fan is in use with the other in the standby mode. The dis- 56 charge from these fans is directed into the auxiliary building exhaust stack.

An inlet damper, furnished with each auxiliary building exhaust and fuel handling area exhaust fan, is used to regulate the volum.e of air exhausted as required 34 to maintain 1/4-inch water gauge negative pressure within the building. These dampers are automatically operated by atatic pressure controllers.

During periods of high radiation in the auxiliary building exhaust, or fuel handling area exhaust, or upon initiation of a containment isolation signal, the auxiliary building supply and exhaust fans and the fuel handling exhaust fans are automatically stopped. Low leakage dampers located in the ducts which penetrate the auxiliary building are closed. An isolation barrier is thus formed between the building and the outdoor environment, and the auxiliary building gas' treatment system is placed in service (see Subsection 6.2.3). '

The building exhaust fans are belt-driven centrifugal type rated at 84,000 cfm each at 6-inch water gauge static pressure. Each fan _is driven by a nominal 125-hp motor.

9.4-11 September 28, 1978

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The fuel handling exhaust fans are belt-driven centrifugal type rated at 60,000 cfm at 7-inch water gauge static pressure. Each fan is driven by a nomigal 34 100-hp motor. These fans are energized by emergency power since they are re-quired to opertte under certain condition,s when normal power is unavailable.

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9.4.2.2.2 Building Cooling System (Chilled Water)

The purpose of the building cooling system is to supplement the general ventilation system and to maintain a more confortable temperature in auxiliary building general spaces at conditions other than design maximum. The building cooling system consists of (2) 100 percent capacity packaged water chillers, each rated at 400-ton nominal capacity, (2) 100 percent capacity primary loop .

circulating pumps, each rated at 800 gpm at 70-ft head, (2) 100 percent capacity secondary loop circulating punps, each rated at 800 gpm at 120-f t head, (6) fan-coil -

34 type air handling units, and associated piping, duct work and controls.

I Primary and secondary chilled water circulating loops are designed for mixing supply and return water to obtain a variable coil inlet temperature, mainly _ , ,

47F to 72F, to minimize unnecessary latent heat removal. Primary loop pump 22;)

provides circulation of water through the water chiller, whereas the secondary loop pump circulates chilled water to air intake heating / cooling coils and also to the six air handling units located in various areas where ventilation air alone is not sufficient to maintain the 104F maximum space temperature.

The twelve heating / cooling coils, located in the building air intake at E1.714.0, I are designed to cool a total of 200,000 cfm of outside air, during cooling season, from 97F to 85F when supplied with 72F chilled water, or heat, during heating 38] season, the outside supply air from.15'F to 60F when supplied with 240F hot water.

.The locations and capacities of the chilled water air handling units are as follows:

UNIT El. AIR (CFM) WATER (GPM) CAPACITY (BTUH) k 1A 714.0 11,300 46 22'2,500 387,000 1B 690.0 21,900 81 IC 669.0 5,850 16 72,500 2A 714.0 11,300 46 222,500 2B 690.0 16,800 62 296,000 2C 669.0 5,850 16 72,500 l

9.4-12 September 28, 1978

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d The chilled water system is designed for manual startup with automatic mixing i

"') of primary and secondary loop flows by'means of thermostatically controlled three-way control valves. l Flow to heat;ng/ cooling coils and to air handling units is individually control valves. controlled at each terminal unit by three-way modulating 34 The seasonal change over from heating to cooling or from cooling to heating is done by the manual operation of system changeover valves located in the mechanical equipment rooms on El.714.0.

9.4.2.2.3 Safety Feature Equipment Coolers Cubicles on areas containing emergency operated safety feature equipment are ventilated by the building ventilation exhaust duct system during normal plar.t operation or when equipment is not required to operate. Air cooling units, lo-cated in each cubicle or area, will automatically start to provide necessary cooling whenever the safety feature equipment is operated. Each of these coolers is designed with to limit the the equipment maximum ambient to 110 F, and is interlocked to operate it serves. A thermostat, located rsear the return airflow to 34 eachc' ooler, allows the cooler to remain in operation until the low limit temperature set point is reached. The cooling water control valve and fan are interlocked to operate together.

Air cooling units are provided for the following equipment and areas:

1. RHR pumps.

2. Safety injection pumps.

( 3. Containment spray pumps.

4. Centrifugal charging pumps.

5. Reciprocating charging pumps.

l34 6.

Unit 1 auxiliary feedwater and component cooling' water pumps.

7.

Unit 2 auxiliary feedwater and boric acid transfer pumps.

8.

Component cooling water booster and spent fuel pit pumps.

9. 34 Pipe chases.

10. El 669 penetration rooms. '

11. El 690 penetration rooms.

12. El 714 penetration rooms.

13. Emergency gas treatment assemblies.

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,y) 9.4-13 May 16, 1975

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34 The above pumps,1 through 5 are each located in a separate room with cooler, and each room (containing pump and cooler) is provided with 100 percent re-dundancy. Pumps and equipment 6 through 13 are each provided with two 100 '

percent coolers with one on standby.

The safety feature equipment coolers are designed to limit the maximum ambient 34 l temperature to 110 F when supplied with water at 83 F. The coolers have the 3 following capacities: ,

Air, Water, Capacity, CFM GPM BTUh RHR pump room 3,700 13 75,000 L-Ssfety injection pump room 4,500 16 91,000 Containment spray pump room 7,700 26 155,000 S Centrifugal charging pump room 11,000 25 109,000 R ciprocating charging pump room 2,800 10 55,000*

Unit 1 auxiliary feedwater and 34 component cooling water pumps 26,000 88 526,000 Unit 2 auxiliary feedwater and "

boric acid transfer pumps 11,700 42 235,000 .

Emergency gas treatment room 2,500 10 50,000 Component cooling water booster ,.

and spent fuel pit pumps 9,800 34 200,000* "

Pipe chases 18,800 64 378,000 Unit 1, El 669 penetration room 3,500 28 158,000 c.

Unit 2, El 699 penetration room 3,500 2,800 28 164,000 150,000

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El 690 penetration room 26  ;

El 714 penetration room 4,700 22 120,000 Air coolers, except those indicated with *, are engineered safety feature equip- 9 ment and are provided with coordinated emergency power and water supply sources.

l 34 y l 9.4.2.2.4 Shutdown Board Room Air-Conditioning. System Tu shutdown board rooms are located on El 734 of the auxiliary building with firewall separating units 1 and 2 equipment. The boards in either unit can provide the service necessary for the safe shutdown of both plant units follow-ing an accident in either unit.

Each fan-coil unit is designed to cool 34,000 scfm.from 76.5 FDB, 63.5 FWB to 54.0 FDB, 53.7 FWB when supplied 'with 225 GPM of chilled water at 42 F. '

The total coil capacity per unit is 1,012,000 BTUh (84.3 tons) minimum. Each 34 unit contains a single centrifugal fan driven by a nominal 60-HP motor to operate against 7.0-in, water gauge of external static pressure. The water chiller has the capacity to cool a minimum of 450 GPM of water from 52 F to 42 F when supplied with 560 GPM maximum of essential raw cooling water at T 83 F, and is rated at 2,250,000 BTUh (187.5 tons).

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9.4-14 May 16, 1975 t ._ _ _ _

I Environm:ntal control for the auxiliery control rcom is maintaintd by tha l shutdown board room air-conditioning system. Each of the four 50 percent l capacity shutdown beard room air-conditioning units is arranged so that any one.of the four units can provide the necessary cooling required by l .J the auxiliary control room. A duct heater, provided in the supply duct to the room, provides heating and/or humidity control as required to maintain the design ambient conditions. Each shutdown board room ,

air-conditioning system is connected to coordinated emergency power I and water supply source trains.

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Each pressurizing fan is centrifugal type designed to supply 1000 cfm against 2.5-inch water gauge static pressure and driven by a nominal 1-hp motor.

9.4.2.2.5 Auxiliary Board Rooms Air-Conditioning Systems The auxiliary building boards, located at floor El. 749.0 are separated y into two subareas per plant unit corresponding to train A and train B 4.

emergency power. Four separate air-conditioning systems are provided ,

to serve one each of the four plant subareas. Following an accident, the boards in either subarea have the capability for the safe shutdown of the unit.

The attendant air-conditioning equipment for each subarea, sized to j recove 1007. of heat produced by electrical equipment in that subarea, y '

are therefore redundant.

Per plant unit, the train A air-conditioning equipment located within 34 -

the El. 749.0 mechanical equipment room, and the train B air-conditioning 1 r

equipment is located on the roof above within a housing for protection 1 from outdoor environmental hazards.

Each board room air-conditioning system contains a refrigerant compressor, air-cooled condenser, a f an-coil air handling unit with direct-expansion ,

V cooling coil (s), two 100 percent pressurizing air supply f ans, air supply distribution system, and control and safety devices. . , .

Two 100 percent capacity roof ventilator exhaust fans located on the roof of each of the four separate battery rooms on El. 749 provide con- .

tinuous ventilation to prevent the possible accumulation of dangerous hydrogen gas.

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The two 100 percent capacity pressurizing air supply fans per air-conditioning system serve a twofold purpose. One is to replacq a portion o,f air-condition-ing system air exhausted through the battery room and the other is to ,

pressurize the board room to prevent infiltration of contaminated air. The mixture of this makeup air and board room return air is conditioned upon passing through the air handling unit.

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One pressurizing air supply f an and one battery room exhaust fan in each >

individual air-conditioning system are connected to train A power with the -

other fan pair connected to train B power. Control system interlocks pro- s vide simultaneous operation of the pressurizing air supply f an and battery -

room exhaust fan. The availability of this f an combination on either power -

. train insures continuous ven'tilation in each battery room regardless of V, operability of the direct-expansion air-conditioning equipment. In the event of air-conditioning system failure, pressurizing fan air is drawn through the norcal board room supply ducts by the battery room exhaust fan.

9.4-15 May 16, 1975

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CoMensing ' hnit ecoling air for the train' A air'-codditioning system of each plant unit istrouted froa intakes ~rDedted on ^tlie roof,< El.niU3', through the

_ condenser and discharged through a' roof-moanted exhaust housing. The train B aysicM condenser cooling air is drawn throWh an intake on the side of the 5

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Equipment housing on the roof and is discharged through an exhaust opening

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E;chtrainAboardroomair-conditioningsystemairhandling unit cooling

% coil is designed to coolfapproximately 10,500 cfm of_ air from 80'F DB u and .66*F WB to 54.0*F DB and 52.5*F WB when operatinfat. 'a,3efrigerant suction tempera-ture of approximate.ly 41*F. Minimum total co'il' h' eat removal capacity per air conditioning unit.is7337,250 BTUh. The hermetic compressor in each unit has a

. capacity of 405,600 BTUh when operating ats 41'Fisuction temperature and a con-

'densing temperat'ure bfb118'F. Each air-cooie'd condensersis desihned to remove - -

. 462,300 BTUh hest:when sgpplied with' 21,800 CFM of air at' 97'F DB.

3 4 - . A Erch train B board room Lair-conditioning system air handling unit eqoling ,

coil is dedigned to coo 1Lapproximately.10,500 cfm of air from 80*F D'i Jc and 66*F WB to 59.7'F DB ands S.G'F.VB when operating st'1 refrigerant ,

auction temperature of approximately 44?F.ihinimun tofal-coil hest re-moval capacity;por air-conditioning unit'is; 395,15U BTUh, 'The . herme t i c'~

~ compressor.in each unit'has a capahity of 450,00 BTUh when opu ating at ~"

-44*F suction temperature'and a condensing temperature of~127*F.. Each air-cooled Eondenser is desisned h remove 518,530..BTUh heat when supplied?

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l with 21,900'cfm of air at;97*F DB;. ,s

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'm; 34 Dampers capable-of withstanding pfe'asute'diff9tcatials between areas of thes El. 749.0'boarderooms;and Mechanical' equipment rooms and the outside environ- 0.

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? ment undcr.' tornado conditions. are "lo'cated "in the intake and exhaust connections '

x i for each of-the train A air; cooled condensers. Each battery roon exhaust fan ,

, has a dnmpei capable of Piths'tarding pre uure differentials imposed;by tornado

- conditions. The dampers are' mounted.below-the'fane 763.0.Smc11 ventilab tion holes ^are provided in damper fram'd'betwee'n er en and damper to allow continuous venting oflhydrogen gas-even-when the damper is closed. Each ofJ these dampers is remote manual operatir.3 and chall.be closed upoth tornado alert. y '

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Fcr ndditional tornado protection; the trainiB air hendling. unit intake and dis-M- '

0- chaig'e ducts, located in ' the frcof top housing, are capable'of withstanding a . .

minimum pressure differential o't 0.5 psi with t'he higher pressure being inside-q the. duct. ' .

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.> - .x s e . .. _ 3 H., The shutdown transformers,-located on El.,749, are' divided into two subareas v '

with seven transformers in each subarca. ;These subareas are further divided into two enclesed areas with train Afemergency ilower available to one trans-

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w Outside air enters each subarea through air intake structures located on the auxiliary building roof. Each roof-mounted exhaust for ventilator is energized by thermostatic control according to room temperature rise. Activation of a  ?

single ventilation fan will in turn open the dampers in both air intake ' structures.

Upon continued increase in room temperature, the remaining exhaust fans are energised in staged series sequence until all available fans are in operation.

Upon outside tempersture decrease, exhaust fans in the individual transformer rooms'are deactivated in staged series as determined by thermostatic control.

As ro)m temperature increases above a predetermine control point, all exhaust fans are again activated.

The shutdown transformer exhaust fans are each direct-driven, propeller-type, 34 roof ventilator exhaust fans rated at 11,000 cfm each at 0.5 inch water gauge static pressure. Each fan is driven by a nominal 2-hp motor.

The transformer room motor-operated air intake dampers have the capability of being remote manually powered to the open position without regard to thermo-

• static control following tornado alert.

Electric heaters provided in each transformer room are designed to maintain temperature at not less than 60*F.

9.4.2.2.7 Miscellaneous Ventilation and Air-Conditioning Systems

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- The control rod drive equipment room design maximum ambient temperature is 90*F DB, 78'F WB. To maintain this, two 100 percent capacity air-conditioning units are located within each room per plant unit. During normal operation, one air-conditioning unit in each room is in operation with one on standby.

Each unit is automatically controlled by a.self-contained thermostat. Electric unit heaters ere located in each room to maintain the room at 60*F, during heat-

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ing season.

The instrument shop design maximum ambient temperature is 80*F. To maintain this, an air-conditioning unit has been selected which utilizes 100 percent

' makeup air *hus preventing the recirculation of any possible contaminant.

The rated capacity of the air-conditioning t.ai.t !s 127,200 BTUh with 1500-cfm air supply. The hot instrument _ shop ventilation is provided by a lab hood 34

/ exhaust fan rated at 1,700 cfm and which discharges to the general building exhaust duct system.

g The sample room is ventilated by five lab hoods with exhaust fans. . 39 Three fans are located on unit 1 side and each rated at 900 cfm at 4 inch water 34 gauge static and two fans are located on unit 2 side and each rated at 1350 cfm at 4 fnch water gauge static pressure. Air enters the sample room through doors with transfer grilles and back draft dampers. Each hood is provided with a separ-ate exhaust fan and HEPA filter assembly. ~The HEPA filters located upstream from 34 each fan have a nominal efficiency of 99.97 percent. A differential pressi

re gauge is used to indicate the need for filter replacement. Each hood exhaust far dis-

-I charges into the general building exhaust system.

9.4-16a April 1, 1976

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The turbine-driven auxiliary feedwater, punp rooms are normally ventilated by the auxiliary building air exhaust system. For emergency ventilation, two roof ventila. tor type exhaust fans are located on the roof of each ro'om. One of these two fans per room is designed to operate on 115-volt, 60-Hz (AC) emergency power while the other is designed for 115-tolt (DC) station vital battery pover.

Both fans per room -are thermostatically controlled to automatically operate upon room temperature rise above 100*F. The DC-powered fan will also auto-matica11y run upon pump start.

• The turbine-driven auxiliary feedwater pump rooms emergency exhaust fans are each the roof ventilator-type rated at 1200 cfm at 0.25 inch water gauge static pressure and driven by a nominal 1/2-hp motor. These fans are designed tc circulate a sufficient quantity of building air through their rooms to limit the maximum temperature rise to approximately 20*F above ambient.

The waste gas analyzer room is located in the sample room on Unit 2. Air enters the waste gas analyzer room through a door with a transfer grille and a back-38 draft damper. Air at the rate of 100 cfm is exhausted into the suction of both sample room exhaust fans on Unit 2 and filtered through the sample room hood exhaust HEPA filter before being discharged inta the general building exhaust system.

The reactor building steam valve rooms each have an independent ventilation O

system consisting of two fully redundant roof mounted exhaust fans, one of 68 which normally operates with one on standby. The normally operating fan draws outside ventilation air for room cooling through a wall opening near the floor. Wintertime space temperature control is maintained by inlet vanes which modulate airflow in response to'a wall mounted thermostat.

9.4.2.3 Safety Evalua tion _

The auxiliary building supply inlets are located near ground level on each side of the building. The inlet area is of sufficient size to limit the incoming air stream velocity to approximately 500 fpm. '

The building air supply filters are rated 85 percent efficiency based on NBS atmospheric dust spot test.

Auxiliary building fuel handling areas, reactor building penetration rooms and other spaces located below El. 734 are continuously maintained at a sligt.t nega-cive pressure relative to outdoors to minimize outleakage. During normal opera-56 tions, these spaces are exhausted to the outdoors. During e.

(.s April 27, 1981 9 4- 6b

. . , , an. vo r.ccid:nt conditions, tha cuxiliary building gts tractment cystea cperetso to exhaunt a reduced quantity of air from fuel handling and other potentially con-taminated arsas through HEPA filters and charcoal adsarbers before release to C.j the environs.

56 Each filter bank is provided with a static pressure dif ferential indicating gauge. Building supply filters are rated-for an initial resistance of approxi-mately 0.40-inch water gauge and shall be replaced with new filtering media upon an increase in resistance to 1.0-inch.

REPA filter cells are rated for an initial resistance of approximately 1.0-inch water gauge when clean and shall be replaced upon an increase in resistance to 2.0 inches.

To guaian~te'e proper cperation of the steam relief valves, the steii~ valve room exhaust fans modulate in response to a wall mounted thermostat to assure that room ambient temperatures do no fall below 80 F during the heating season. In the event extreme outside wintertime conditions still 68 result in room temperatures falling below 80 F, the fans automatically shutdown.

9.4.2.4 Inspection and Testing Requirements The auxiliary building environment control systems are in continuous operation and are accessible for periodic inspection. Essential electrical components, O"u swithcovers, and starting controls are tested initially and periodically.

HEPA filter cells are tested in place initially and periodically with DOP.

Radiation monitors are calibrated and tested periodically using a calibrated check scure,e to verify the instruments response and alarm functions. Thermo- ,

stats and smoke detectors are tested periodically.

9.4.3 RADWASTE AREA 9.4.3.1 Design Bases The auxiliary building ventilating systems serve all of the radwaste areas which are ;;hysically located within the auxiliary building at El 690, 669 and i 653. These areas are continuously ventilated, and the exhaust air is continu-I ously filtered to limit the release of radioactive material to the atmosphere.

Filtered and heated or cooled (if necessary) fresh air is mechanically suppliad l 34 to the general occupied or access areas of each floor by the auxiliary building main air supply system. Air is mechanically exhausted from each radwaste equip-ment room ar.d directly from individual radwaste tanks, sumps and equipment by the auxiliary building main exhaust system. All. exhaust air is routed through duct building exhaust' stack.

Q:p All radwaste areas are continuously maintained at a slight negative pressure relative to minimize exfiltration of air to other portions of the building.

A radiation-monitoring system is provided to detect and annunciate high activity in the building exhausts. _

9.4-17 April 27, 1981

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SNP-60~ , ,

9.4.3.2 System Description /' '

C The auxiliary building radwaste area ventilating systems are shown on Figure 9.4-4.

Radwaste spaces air supply, air exhaust, and air filtering systems are discussed in Paragraph 9.4.2.2. .

9.4.3.3 Safety Evaluation Refer to auxiliary building FSAR Paragraph 9.4.2.3.

9'4.3.4

. Test and Inspection Requirements Refer to auxiliary building FSAR Paragraph 9.4.2.4.

9.4.4 TURBINE BUILDING 9.4.4.1 Design Bases 34 The turbine building heating, cooling and ventilating systems are designed to maintain an acceptable building environment for the protection of plant equipment and controls; for the comfort and safety of operating personnel;

.?nd to allow personnel access for the operation, inspection, maintenance, and testing of mechanical and electrical equipment.

The building environmental control systems are designed to maintain building temperatures between 50 F minimum and 110 F maximum during all outdoor 38 l temperature conditions ranging from 15 to 97 F, by use of forced ventilation, mechanical cooling, and heating systems.

9.4.4.2 Ventilation 60 The Turbine Building Heating and Ventilation Systems are shown on Figures 9.4-13, 9.4-14 and 9.4-15.

The building can be considered to contain four large rooms: Ei 732.0 turbine room, El 706.0 spaces, El 685.0 spaces, and El 662.5 spaces. Because El 732.0 floor is predominantly concrete and thus isolated from the remaining floors below, the turbine building ventilation is provided by two separate sys te ms . One system serves El 732.0 spaces, and the other system provides 34 ventilation for the spaces on El 706.0 and El 685.0, with no direct ventilation provision for spaces on El 662.5.

Basically, both ventilation systems operate on the basis of mechanically supplying a continuous flow of outside air.co spaces being ventilated, and exhausting the building air to outdoors.

Each supply and exhaust fan is provided with a motor operated damper designed to automatically close when fan is stopped to prevent air back-flow.-

s.

9.4-18 March 2, 1979 *<

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