ML20064N855

Damper Test Rept for South Texas Project Units 1 & 2

ML20064N855
Person / Time
Site:	South Texas
Issue date:	10/12/1984
From:	AMERICAN WARMING & VENTILATING, INC.
To:
Shared Package
ML20064N835	List: ML20064N855 ML20064N890 ST-HL-AE-4548, Submits Addl Info Re STP Tornado Dampers as Requested by L Kokajko During 930915 Telcon.Attachment 1 Includes Photographs of Installed Tornado Dampers at Stp.Attachment 2 Provides Vendor Test Results for STP Tornado Dampers
References
NUDOCS 9403300158
Download: ML20064N855 (27)

Text

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O !NO!AN WOOD C:RCLE . MAUMEE. OHIO 43537 DATE: 10/11/84 ENGINEERING pace . 1 0F 12 TITLE: Da gar Test F4 port kom.10. : NBD-70 & NBD-71 UTILITY: Houston Lighting and Pcv,er Co.

FACILITY: South Texas Project - Unit 1&2 I';GI'EEP. - Bechtel Energy Corporation - Fouston EICCEL JOB NO. 14P2G-031 PLTCUSE CFIER NO. 35-1197-4168 F0R APPROVAL EFECIFICATICi NO. . 3V289VS0003 0CT 121984

/M PT.CICTIO: NO. 80273.'130 AhV ERAWING SERIES: 80278-023 & 024 AW&V PEEPATED BY: / ,1 ""4<7 DATE: _/[ f

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APPFm ED BY: Aw EIyW DATE: /C/[z[y'4-DESCRIPT10r1 BY APPROVALS REV. DATE s

I 9'403300158 931013 PDR ADOCK 05000498 '

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.., 0 INDIAN WOOD CIRCLE . MAUMEE. OHIO 43537 DATE:

El1Gil1EERil1G PAGE: 2 0F 12 TEST RESULTS FOR NBD-70 6 NBD-71 DAMPERS Two (2) Dampers were tested for Bechtel Energy Corp. , South Texas Project, A'.fV Job No . 80278/130, in accordance with the approved Test Procedure 80278-702 Rev. D. The daraper tag no.'s are: (MBD-70) 3Vll1VDA277 / (N3D-71) 3V111VDA276.

l TABLE OF COPENTS Description Page Damper Cycle Test . . . . . . . .......3 ,

Blade Deflection Test Due To Pressure . . . . . 4 Leakage Test . . . . . . . . . . . . . . . . . 5 Computer Printouts Of Lab. Tests . . . . . . . 6- 12 I

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.10 INDIAN WOOD CIRCLE e M AUMEE, OHIO 43537 DATE:

EllGillEERif1G pace: a or 12 DAMPER CYCLE TEST Each damper was successfully cycled 25 times in accordance with Test Procedure 80278-702. No rework was required upon completion of the cycle testing.

Successfully Rework Damper Tag # Site (in.) Cycled 25 Times Required 3'lll1VDA2 7 7 12 x 12 Yes None 3V111VDA276 24 x 42 Yes None s

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• OfflPln~On Warming DOCUtsdT NO, 80278-741 d M Q T EL}h 6 OnC Ven"i 0"ing inC 131o indian wood circle / moumee, Ohio 43537 PAGE 4 - 0F 12 BLADE DEFLECTION TEST DUE TO PPISSURE (NBD-70 & NBD-71)

The test damper was mounted to the end of the test chamber and the differential pressure across the damper was gradually' increased from zero to the design pressure or the system's maxit:um pressure.

Two deflection gauges were read under pressure and recorded. Both gauges were incasuring on the axle centerline; gauge no. 1 was at the blade end and gauge no. 2 was at the midspan centerline. The pres-sure was released and both gauges returned to with + .002" of the zero set point.

The reading from gauge no. 1 was subtracted from the gauge no. 2 reading for actual blade deflection at the test pressure. This was converted to blade deflection at the design pressure so that it could be compared to the allowable deflection.

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BLADE DEFLECTION (in) " GAUGE #1 GAUGE (/2 Design AP

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@ DESIGN A P ( in ) (' in ) Test AP The dampers were tested in accordance with Procedure No. 80278-702 Rev. D.

Tabic Ho. 1 licts the damper tag no., damper size, design differential pressure, blade deflection at the design differential pressure and the allowable blade deflection.

In each case actual deflection was less than the allowable deflection.'

No rework was necessary.

TEST RESULTS TABLE NO. 1 ELAIE IEFL. AllIMAEIE IES. AP (in) @ DES. DEFIECTIGT (in)

TAG UO. TEST NO. SIZE (in) (in-w.g.1 AP @ IESIGi AP 3V1117DA277 84-0767 12 x 12 83 .001 .033 3VlllVDA276 84-0819 24 x 42 83 .020 .067

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1310 indian wood circle / moumee, ohio 527 I

PAGE 5 OF 12 LEAKAGE TEST The test damper was mounted to the end of the test chamber and the differential pressure across the device was gradually increased from zero to the maximum chamber limitation. LeakageThereadings leakage were was taken at 60, 70,.80, 90 and 100% of this pressure.

calculated, corrected to standtrd air and plotted. The m'easured-leakgge was determined by extending the curve to the design pressure.

Table # 2 lists the damper tag number, the allowable leakage and the measured leakage results.

In each case the censured leakage is less than or equal to the allevable leakage.

LEAEAGE TEST RESULTS Table # 2 Design Damper Pressure Allowable leakage Measured Leakage  !

Tag No. - Te st No . Size (in)(in. w.g.) ' (scfm)CDes. Press (sefm)CDes. press. t 12 x 12 83 (3 PSI) 137 113 3V111VDA277 84-0768 24 x 42 83 638 638 3V111VDA276 84-0820 .

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1310 INDIAN WOOD CIRCLE . MAUMEE, OHIO 43537 DATE:

Ef1GillEERil1G '

PAGE: 6 or 12 t

DEFINITIONS FOR ABBREVIATIONS USED ON TEST LABORATORY PRI?.7 OUTS DET - Deter =inatien D6 - Represents the diameter (in f eet) of single nozzle that has an area equal to the sue of the areas of all the nozzles used in a particular cc:bination.

DN - A term used to represent the nozzle coefficient of discharge for the particular nozzle combination being used. .

D?S - Static pressure dif f erential across the device under test. -

PD - Fressure differential across nozzle.

SP5 - Static pressure at plane 5.

DES - Dry-bulb t c=perature a t plane 5.

DBA - Dry-bulb tc=perature in general test area.

WBA - Vet-bulb te=perature in general test area.

BFA - Baremeteric pressure.

TB - Barc=etric teoperature.

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. D ! . A O N E R . 01-1 I 0 PAGE '7 OF /2 AWV: 20772-741 JOB NUMBER: 8027e/130 TEST NUMBER: 04--0767 DATE OF TEST: 10/0/04 TEST UMIT MANUFAETURER: A W'1 TRADE NAME: DAMPER MOD-70 MODEL NO.:

SIZE: 12 X 12 t!D. OF DLADES: 1 TEST hETH00 PER AFCA STAMDARD 500-75 TEST SETUP APPARATUS:FICURE 5.'+

AIP FLOW M.EA9UREMENT APP AR A199: FIGUt:E 6. 3 TEST TYPE:9TRUCTUPM M EGRITY TEST DE7EPMINATIOMO:

DET D6 Dt! DPS PD SP5 DDS DBA UBA DPA TD 1 0.15770 0.11 06 Ac.150 1.250 46.150 60.7 '73.0 55.0 29.49 73.0 REGULTS AT TEST E0r!DITIONS AT STANDARD AIR DENSITY DET DENGtTv D E' T f- P S CFM DELTA PS~ CFM 1 0.07297 4 15e 05.6 47.493 e5.6 RE M e '-t.5 T AC r 35 8111i.8D A277 ,

GAUGE PIADING (in)_ GAUGE' PITUPS _ (in)

GAUGE NO. 1: .004 .000 GAUGE NO. 2: .0035 .000 BLADE DEFLECTIO" " (in) = GAUGE NO. 1 GAUGE NO. 2 DESIGN AP ,

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PAGE 9 OF /2 AWV:_ A'o278-74-1 A M E F: I C A N i! a A P M I N C t. V E N T I L_ A T I N G INC.

E' F: A D x8 'r F: .. O !-I I O JOB HUMBER: 90278/130 TEST-HUMBER: 84-0020 I

DATE OF TEST: 10/9/04 ,

TEST UNIT MANUFACTURER: AWV TRADE NAME: DAMPER MODEL NO.: MDD-71 SIZE: 24 X 42 MO. OF OL.'0ES: 4 TYPE OF SEALS: D -DULD E EP7 -4 CLOSIt!E TOROUE: M/A TEET t:ETH0b PER AMCA STANDARD 500-75 TE9T SE10P APPAPATUS:FIGUPE 5.4 AIR FLOW HEASUREMEFT ACPARnTUC:FICURE 6.3 TEST TYPE LE A!' AGE DETEPHINATIONS:

PD 9P5 095 D9A tJDA DPA -TG P D5 DN DPS 65.0 29.59 71.0 1 0.25000 0.25000 0.730 0 120 9. '30 72.2 72.5 0.410 17. ~' 00 - 71.7 72.0 64.0 29.5? 71.0- '

2 0.25000 0.2500'.' 17.700 71.0.

0.25000 25.19, 0.000 25.100 71.1 72.0 64.0 29.59 3 0.25000 64.0 29.59: 71.0 4 0.25000 0.25000 34.460 1.760 34.460 60.0 72.0 ,

7.000 43.030 69.2 72.0 64.0 29.59 71.0 l 5 0.20000 0.25000 3.030 i PE90LTS l 1

AT 1EST CONDITIONS AT STANDARD AIR DENSITY i l

1 DELTA PS CFM DELTA PS- CFM l DET DEMSITY 0.07291 0.730 66.5 8.979 66.5 -

1 0.07301 17.700 123.9 16.192 123.9 l 2 192.0 3 0.07301 25.190 102.0 25.965 0.07301 34.460 257.7 35.398 257.7 4 336.2 5 0.07301 43.930 336.2 45.023 REMARKS TAG ti 39111VDA276 1

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PAGE /d ' OF /2 AVN: 2072A - 74I A M E F: I C A bt l! ARMING S- UENTIL.ATING INC DRAONER, OHIO JOB NUMBER: 80278/130 TEST NUMBER: 84-0019 '

DATE OF TEST: 10/9/e4 -

. i TEST UNIT MANUFACTURER: AUV TRADE NAME: DAM.0ER MODEL NO.: t!00-71 SIZE: 24 X 42 NO. OF BLADES: 4 TEST METHOD PER A"Cn STANDARD 500-75 TEST SETUP APPARATUS: FIGUf l 5.4 -

AIR FLO4 MEASUREME*!T APPAPATUS: FIGURE 6.3 TEST TYF E: STRUCTUML INTEGRITY TEST DETERMINATI0H5:

DET D6 DU DPG PD SP5 DD5 DBA WBA EPA. TG 1 0.33341 0.3334: 46.300- 1.050 46.300 66.2 70.0 63.0 29.59 71.0 ZOULT5 AT TEST CONDIlION9 AT STANDARD AIP DENSITY DET DE t ":I r f DELTA P5 CFM DELTA PS CFM 1 0. >> ? .: 2 - -n.3 0 3$3.3 47.375 352.3 PEMAR!$

TAC tt 3 t.'111')D n 2's GAUGE READING (in) GAUGE RETURN (in)

GAUGE NO. 1: .015 .0015 GAUGE NO. 2: .004 .001 i

BLADE DEFLECTION (in) GAUGE NO. 2

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- A M E i:: I C A N . t % F: t-i l M G 6. L.'E N T I L A T I N G INC 15 F: A D N E F: O H I O JOB NUMDER: 80278/130 TEST NUMBER: 84-0768 DATE OF TEST: 10/8/94

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TEST UNIT MANUFACTURER: AUV TRADE NAME: DAMPER MODEL NO.: NOD-70 SIZE: 12 X 12 NO. OF BLADES: 1 TYPE OF SEALS: EPT-4 6. D-BULO CLOSING TOROUE: OPERATOR CLOSING TEST M21 HOD PEP AMCA STANDARD 500-75 h TEST SETUP APPARATUS: FIGURE 5.4 i

~ AIR FLOW MEASUREMENT APPARATUS: FIGURE 6.3 .

TEST TYPE: LEAP. AGE DETERMINATIONS:

DET Do DM DF S PD SP5 DOS DDA WBA DPA T9 1 0.00393 0.09393 9.920 0.145 9.920 70.2 74.0 56.0 29.47 72.0 2 0.00393 0.09303 19.550 1.910 19.550 69.0 73.0 55.0 29.49 73.0 3 0.15779 0.11606 27.950 0.590 27.950 69.4 73.0 55.0 29.49 73.0 4 0.15772 0.11606 37.300 0.950 37.300 69.0 73.0 55.0 20.49 73.0 5 0.15779 0.11605 46.150 1.250 46.150 68.9 73.0 55.0 29.49 73.0 RESULTS AT TEET COMDITIOMS AT STANDARD AIR DENSITY DET DENSITY DELTA PS CFM DELTA PS CFM 1 0.07269 9.920 0.0 10.133 0. 0 2 0.07297 19.550 29.9 19.089 29.0 .

3 0.07297 27.950 6u. 5 29.763 59.5 4 0.07297 37.300 74.5 38.395 74.5 5 0.07297 46.150 95.6 47.493 85.6 REMARits TAG H 3V111VDA277 F

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SOUTH TEXAS NUCLEAR PROJECT y T

DESIGN BASIS DOCUMENT EXTERNAL ENVIRONMENT SN209MB1035 .

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't South Texas Project Units 1 and 2 SN209MB1035 EXTERNAL ENVIRONMENT Revision 0 .  ;

Page 3-6 of 3-55 ,

P where W,= Tornado wind load due to wind velocity ,

pressure 1 W, - Tornado differential pressure load W, - Single tornado generated missile load .

The following Category I structures are designed as non-vented with respect to tornado depressurization effects (i.e., systems and components located inside these structures will be protected from depressurization effects):  ?

A. Mechanical Auxiliary Building (except for truck bay)

B. Electrical Auxiliary Building C. Fuel' Handling Building D. Reactor Containment Building I E. Auxiliary Feedwater Storage Tank Details on protective measures are provided in Section 4.1.

• 3.1.3.2 Non-Category I Structures and Systems ~l Design wind velocity for non-Category I structures,- systems and 't components except nonsafety-related piping and supports and PAR .

KUT Model 43 security booths and supports is 120 mph at 30 feet -i above ground level. (Reference'6.3.1) This wind speed'is based. l on the maximum recorded, sustained hurricane winds in the Texas-  !

coastal area. (Reference 6.1.10)

Nonsafety-related piping and supports and PAR-KUT Model 43 security booths and supports.are designed to withstand a wind velocity of 90 mph at 30 feet above ground level. (Reference  ;

6.3.1)  ;

i EE-SEC3.WPF

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l South Texas Project Units 1 and 2 5H209MB1035 '

EXTERNAL ENVIRONMENT Revision 0 Page 4-1 of 4-23 4.0 PROTECTIVE HEASURES This Section discusses specific protection features provided at STP for the Design Basis Events identified in Section 3. Refer to Table T-12 for a matrix which identifies hazards discussed in this DBD along with the appropriate section number. The bulk of Table T-12 comes from the South Texas Project Probabilistic Safety Assessment Summary Report. (Reference 6.2.19) 4.1 TORNADO AND WIND  ;

4.1.1 Category 1 Structures A minimum thickness of 2 feet is provided for the roof slab of the ECWIS to protect against tornado missiles. (Reference.6.3.22) At the ECW Discharge Structure, the slab above the walls and on the sides of the discharge piping is 2 feet thick and is designed for i protection against tornado missiles. (Reference 6.3.22) The minimum thickness of concrete walls and roofs provided for all Category I structures to resist the effects of postulated tornado

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winds and missiles is 2 feet, except for the Auxiliary Airlock Shield structure roof which is 1 foot. The integrity of this I foot structure has been analyzed and determined to provide the necessary protection for missile impact. -(Reference 6.3.35)

The Mechanical and Electrical Auxiliary Building is provided with tornado resistant doors as listed in References 6.3.46 and~6.3.47.

The Diesel Generator Building, Essential Cooling Water Intake Structure, and fuel Handling Building are considered as vented buildings with no tornado protection provided at the outside openings. It should be noted that the door between the Fuel Handling Building and the Mechanical Auxiliary Building is designed for a tornado. The inside of these buildings will see-tornado depressurization.

See Open Item 01-EE-09.

EE SEC4.VPF

South Texas Project Units 1 and 2 SN209MB1035 EXTERNAL ENVIRONMENT- Revision 0 Page 4-2 of.4-23 4.1.2 Non-Category I Structures Reference 6.5.33 provides an analysis showing that the TGB will-not collapse onto any nearby Category I structures. In addition, since the elevator and stair tower structure on the east side of the TGB is adjacent to the DGB, this tower structure is designed for the tornado loads. (Reference 6.3.20)

The deaerator structure is designed to resist the tornado loads in the north-south direction. A potential failure of this structure in the east-west direction will not impair the integrity and functionality of any Category I structure. (Reference 6.3.20) 4.1.3 HVAC Openings All outside air intake and exhaust openings of the EAB main control room HVAC system and EAB main area HVAC system are protected by tornado dampers designed to close automatically within 0 25 seconds during tornado conditions. (References 6.3.6 and 6.3.9)

All EAB technical support center HVAC system penetration openings in the EAB outside walls or roof are protected'with tornado dampers designed to close automatically within 0.25 seconds during; tornado conditions. (Reference 6.3.10)

The outside air intake opening of the FHB supply air system is provided with a tornado damper with a closing time not to exceed 0.25 seconds. (Reference 6.3.11)

See Open Item 01-EE-10.

The outside air intake and exhaust air openings of the MAB main supply and exhaust system are provided with tornado dampers with a closing time not to exceed 0.25 seconds.- (Reference 6.3.12)

EE-SEC4.WPF^

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' SYSTEM DESCRIPTION COVER SHEET SOUTH TEXAS PROJECT JOB NO.14926-001 ,

System EAB HVAC' j.ib 90 Revision 7 Revision Da -

$- TPNS Number '5V119VD0106 Date of Origin 04/24/85 Revision Rationale: Revised to reflect as-built conditions and min / max motor HP ror LAB return fan. ,

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APPROVAL SIGNATURES e.A m -1 W h/g N/A k'EGL M(Origin) Date EGS' (Origin)Dat4[jsChief Date

, N/A N/A N/A i 75% EG5 Date Plant Design EG5 Date Mechanical EGS Date

'N/A N/A N/A Iiectrical EGS Date Civil EGS Date Controls EGS Date '

N/A N/A fh. Lil7l88 Nuclear EGS Date Architectural EGS Date PQE Date N/A M gn & w ji L ///.7/ff Startup Date Project Engineer Ddte p ~* . .. # 4 if k *f,

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SV119VD0106 Rev. 7 Page 1 of 59 1.0 FUNCTION The Electrical Auxiliary Building (EAB) heating, ventilating, and air '

conditioning (HVAC) system consists of the EAB main area HVAC subsystem, the main control room envelope HVAC subsystem, and the technical support center (TSC) HVAC subsystem. The function of these subsystems is to ensure the safety and comfort of plant personnel and operability of plant equipment during normal conditions and postulated accident conditions. <

2.0 DESIGN BASES 2.1 SAFETY DESIGN BASES 2.1.1 Safety Design Bases for the EAB Main Area HVAC Subsystem A. The EAB main area HVAC subsystem, except for the heating system for areas other than ESF battery rooms and elevator machine room HVAC system, is designed to remain functional during and after all upset and faulted conditions.

B. The EAB main area HVAC subsystem is designed so that a single failure of any active component, assuming loss of offsite power, _

cannot result in a loss of safety-related HVAC function in the building.

C. The battery rooms have a redundant, separate exhaust system designed as Safety Class 3 with spark-proof fan and motor.

Controls are p-ovided to alarm loss of air flow in each battery room. ,

D. Each battery room ventilation maintains the hydrogen concentration below 2 percent by volume, which is less than the-lower flamability level of 4 percent.

E. The EAB main area HVAC subsystem components except for electrical penetration area normal HVAC system, heating system for areas other than ESF battery rooms and elevator machine room HVAC system, are designed as Safety Class 3 and seismic category I. The nonsafety equipment and ductwork supports are designed.

as Safety Class 7 pe'r Seismic II/I design criteria.

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i F. The subsystem consists of three 50-percent-capacity trains. 1 Each train consists of an air-handling unit (AHU) with I makeup / return air mixing box, prefilter, high efficiency filter, i supply air fan, cooling coil, heating coil, and a l return-air / smoke purge fan. The efficiencies of prefilters and j high-efficiency filters are 85 percent and 95 percent, ,

respectively, based on ASHRAE Standard 52. Reheat coils, return-air riser, exhaust-air riser, outside air, and supply air riser are common to all trains. An outside air intake louver (partly MAB intake louver) and its ductwork are shared with control room envelope and TSC subsystems. The electrical penetration area safety-related subsystem consists of three 100-percent fan coil units, one for each of the three train-separated penetration areas. The AHU and fan coil units cooling coils are served by the essential chilled water system.

G. The subsystem is designed to maintain the room temperatures given in Table 1.

H. Design outside temperature conditions are as follows:

Winter 29'F DB minimum Summer 95'F DB maximum 81*F WB maximum 16'F daily range I. Controls are provided to trip the nonsafety heating coils during faulted condition, to prevent inadvertant operation.

J. The battery roome' xhaust fans are operated at all times. The battery room is maintained at a slightly negative pressure by providing exhaust air flow greater than supply.

K. All outside air intake and exhaust openings are protected by tornado dampers designed to close automatically subsequent to 3 psig differential pressure within 0.25 seconds during tornado conditions.

L. The HVAC equipment trains are separated from each other with physical barriers such that a comon-mode failure of any train does not jeopardize the other trains.

M. A monitoring system is provided to indicate fan status and air flow failure, filter loading, high temperature in critical areas, and operable dampers status.

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• SV119VD0106 Rev. 7 Page 3 of 59 2.1.2 Safety Design Bases for the Main Control Room (MCR) Envelope HVAC Subsystem A. The radiation exposure of control room personnel through the duration of any postulated design-basis accident does not exceed the guidelines set by 10CFR50, Appendix A, General Design Criterion 19.

B. Through the duration of any postulated design-basis accident, the subsystem maintains the control room envelope atmosphere at temperatures suitable for prolonged occupancy and equipment operation. Sufficient ventilation is provided for people occupying the MCR envelope during all operating modes.

C. The MCR HVAC subsystem is capable of automatic transfer from its nonnal operational mode to its emergency or isolation modes upon '

detection of conditions that could result in induction of airborne arraonium hazardous hydroxide,chemicals (anhydrousacetic HCL, acetaldehyde, ammonia, vinylnaphtha acid and acetate $

above pennissible concentrations (Regulatory Guides 1.78 and 1.95), outside air smoke into the control room, or exposure of control room personnel to a high level of airborne radioactivity.

D. The subsystem is designed so that a single failure of any active component assuming loss of offsite power cannot result in the inability of this subsystem to comply with paragraphs 2.1.2.A, B, and C, above. ,

E. The MCR HVAC components (except for the toilet / kitchen exhaust system, computer room, HVAC system, and heating system) are designed as Safety Class 3 and seismic category I. Those components that are nonsafety-related have equipment and duct supports that are designed as Safety Class 7 per Seismic II/I design criteria.

F. The subsystem consists of three 50-percent capacity trains.

Each train consists of an AHU, RA/SP fan, emergency cleanup filter train (ECFT) unit, and makeup filter train (MFT) unit.

The supply air duct, return air duct, anc 2 heat cmil(s) are shared by each of the three 50-percent ti uns. The outside air intake louver (partly MAB intake louver) and its ductwork is shared with the subsystem in paragraph 2.1.1 above.

Each AHU consists of a prefilter, high-efficiency filter, chilled-water cooling coil, and supply fan. The efficiencies of the prefilter and high-efficiency filters is 30 percent and 95 percent, respectively, based on ASHRAE 52. The cooling coils are served by the essential chilled water system.

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SV119VD0106 Rev 7 Page 5 of 59 P. All outside air intake and exhaust openings are protected by tornado dampers designed to close automatically within 0.25 seconds during tornado conditions.

O. The HVAC equipment trains are separated by physical barriers such that a comon mode failure of any train does not jeopardize the other trains.

R. Air locks are provided for doors at the control room envelope boundary which may be used following accidents. Other boundary doors are locked during accident conditions.

2.1.3 Safety Design Bases for the Technical Support Center (TSC) HVAC Subsystem .

The TSC HVAC subsystem has no safety design bases.

2.2 POWER GENERATION DESIGN BASES 2.2.1 Power Generation Design Bases for the EAB Main Area HVAC Subsystem A. This subsystem provides a secondary means of removing smoke from the main area upon a manual start after fire detection.

B. The outside air quantity is increased to 100 percent when required to purge the main area of smoke after a fire.

C. Electric heating coils for areas other than ESF battery rooms are powered from the non-Class 1E ac auxiliary power distribution system.

D. A room thermostat is provided for each electric duct heating Coil.

E. Chilled water flow to the cooling coil is controlled to maintain 55'F supply air temperature during normal operation and uncontrolled with full flow through the coil during accident conditions.

F. Outside air is provided for the elevator machine room-ventilation to maintain a room temperature of 104'F. The system is nonsafety and consists of one 100-percent exhaust fan with an .

outside air intake.

G. The following design bases apply to the penetration space HVAC subsystem:

1. The cooling subsystem is designed as nonsafety and nonseismic for normal operation.

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• , Rev.'7 Page 18 ref 59 B. Tornado dampers in the intake and exhaust openings close subsequent to receipt of 3 psig differential pressure within ..

0.25 seconds. Under this condition, the HVAC equipment internal to the EAB is protected from the rapid depressurization.

The damper will automatically open subsequent to the absence of this differential pressure. No operator intervention is required under this condition since the depressurization occurs for a very brief period, except in case of battery room exhaust fans which would tend to keep the damper closed. Therefore, following a tornado the operator is required to shut the exhaust - "

fans momentarily to~ allow the tornado dampers to open.

C. A smoke detector is installed in the return duct downstream of each return fan. Upon rec.eipt of a smoke alam, the return air dampers are. shut, the outside air dampers are fully. opened, and the smoke purge dampers are opened manually. The outside air intake damper 8V101VDA221 in MAB is opened ma^nually to provide additional outside air during smoke purge. Under this.

. condition. all the return air is discharged via the common exhaust riser with _100 percent outside air supply. Nomal damper lineup must be reestablished manually, subsequent to the absence of a smoke alam.

D. In the event that a smoke alarm is observed during winter operation, an electric heating coil in the common outside air intake riser is energized manually. This coil will elevate _the temperature of the inlet air and thus prevent possible freezing '

of the AHU cooling coils.

E. On receipt of an ESF signal, all heating coils and reheat coils (except for the b,attery room) will be automatically deenergized in order to prevent inadvertent operation and consequent degradation of cooling.

F. On receipt of an ESF and/or LOOP signal, the control. valve for main AHU cooling coil chilled water flow fails in full-open position through the coil. Also, the electrical penetration- 'i area emergency AHUs are started. During this operating a condition, the electrical penetration area nomal AHUs and exhaust fans are not required to operate.

G. During single train shutdon, specific EA9 fire dampers require manual isolation to preclude shutdown areas from exceeding temperature limits (refer to Section 5.G for required achinistrative actions and Reference 6.D for overall shutdown

. description).

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SV119VD0106 Rev. 7 Page 19 of 59 3.2.1.3 Dutdown

' Shutdown of this subsystem is accomplished by deenergizing the fans at either the MCR or the auxiliary chutdown panel, and the heaters by local room thermostats.

3.2.2 Control Room Envelope Subsystem 3.2.2.1 Startup A. Startup of this subsystem is identical to the EAB main area HVAC subsystem regarding verification of damper position and fan ~

energizing at the MCR. It is noted, however, that in addition,

1) two bubble-tight dampers at the outside air inlet for each main AHU and the exhaust fan inlet are open; 2) opposed blade emergency bypass damper in each main AHU return air inlet are fully open; 3) return air inlet damper 'for each cleanup filter unit are closed; and 4) halon isolation dampers in the supply and return ducts for relay and computer room are open. Also, after establishing the chilled water flow, one of the two AHUs for the computer room is started from the MCR. None of the control room HVAC subsystem is controlled at the auxiliary shutdown panel. The makeup and cleanup filter units do not operate during normal operation.

l B. The duct reheat coils for all the rooms are energized and i controlled by local room themostats. Each heating coil is interlocked with a flow switch to prevent energization in case of low air flow through the coil.

C. Consistent with the' design of the EAB main area HVAC subsystem, j the following controls are provided: 1) chilled water valves to ,

maintain supply air temperature at 53'F; 2) pressure i differential indication and alarms across the fans and filters; '

and 3) high-temperature alams in critical areas.

D. The main system supplies a total of 34,800 scfm of conditioned I air, returns a total of 32,800 scfm, and exhausts 1000 scfm 1 during nomal operation. The excess 1000 scfm maintains slightly positive pressure during nomal operation.

E. The computer room AHUs are controlled by a thermostat and )

humidistat furnished as part of the unit package.

3.2.2.2 Operation A. HVAC operation continues as discussed in Section 3.2.2.1 above except for the following off-nomal conditions:

1. Receipt of an ESF signal 5932W/0197W I

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- Rev. 7 Page 21 of 59 The makeup unit heating coil maintains the humidity level at less than 70-percent relative humidity as required for suitable operation of carbon filters. The cleanup unit does not require a heating coil since the return air and makeup air mixture is previously conditioned, such that humidity is always less than 70-percent relative humidity.

D. ' Consistent with EAB main area HVAC design, on receipt of an ESF signal the duct reheat coils are deenergized and the control valves for main AHU cooling-coil chilled water fail in the full flow-through coil position.

E. Smoke purge operation is the same as for EAB main area HVAC system. See section 3.2.1.2.C.

F. Tornado dampers at the intake and exhaust openings are shared with the EAB main area HVAC system, and operation during a tornado is the same as for EAB main area system. See section 3.2.1.2.B.

3.2.2.3 Shutdown Shutdown of this subsystem is accomplished by deenergizing the fans at the HCR, and heaters by local room themostats.

3.2.3 TSC HVAC Subsystem The subsystem is nonsafety-related with the exception of the safety-related tornado dampers which are Class 3 dampers. The subsystem is reliable based on having the TSC diesel as an alternate power source. In addition, the supply and return air fans as well as 'the chilled water system is designed with 100 percent redundancy.

3.2.3.1 Startup A. Operation of this subsystem is controlled locally in the TSC area, which has all the controls and system monitoring. The system operation is similar to control room HVAC system, except this is a single-train system with 100 percent redundancy for the supply and return fans only. Prior to manual start of the fans,.the outside air inlet damper and return air dampers for the main AHU and nomal exhaust damper are verified to be open.

The smoke purge exhaust damper is similarly verified to be closed. After damper position verification and establishing chilled water flow through the main AHU cooling coil, the supply, return, and exhaust fans are started. Only one supply and return fan is required to operate; the other is on standby.

Also, after establishing the chilled water flow, one of the two AHus for computer room is started. The makeup _ filter unit does not operate during nomal operation.

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