ML20059B072
| ML20059B072 | |
| Person / Time | |
|---|---|
| Site: | 05000605 |
| Issue date: | 08/22/1990 |
| From: | Marriott P GENERAL ELECTRIC CO. |
| To: | Chris Miller NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| EEN-9048, NUDOCS 9008280004 | |
| Download: ML20059B072 (21) | |
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GE Nuclear Energy w'[ .O i cenew tw& comm U$ Cu'twr Annat Sem hse, CA 95125 -
' MFN No.105 90 -
Docket No. STN 50 605 EEN 9048 I
Document Control Desk U.S. Nuclear Regulatory Commission Washington, D.C. 20555 Attention: Charles L. Miller, Director Standardization and Non Power Reactor Project Directorate l
Subject:
Submittal of Responses to AdditionalInformation as Requested in NRC I4tter from Dino C. Scaletti, Dated August 15,1990
Reference:
- 1. Submittal of Responses (Proprietary Information) to Additional Information as Requested in NRC Letter from Dino Scaletti, dated August 15,1990, MFN No.106 90, -1 dated August 22,1990 p
Dear Mr. Miller:
Enclosed are thirty four (34) copies of Chapter 9 responses to the subject Request for Additional Information (RAI) (Enclosure 2) on the Standard Safety Analysis Report (SSAR) for the Ad-vanced Boiling Water Reactor (ABWR). Please note that the submittal dates for Enclosures 1 & 2 to the August 15,1990 NRC letter are reversed. This submittal complies with the August 31,'1990 submittal requirement. Responses for Enclosures 1 and 3 will be supplied by September 28,1990.
Responses to Questions 430.241, 430.244, 430.245, 430.246, 430.247, 430.248, 430.248, 430.249, 430.253,430.254, 430.256'and 430.357 contain information that is designated as General Electric -
i Company proprietary information and is being submitted under separate cover.
3 . It is intended that GE will amend the SSAR with these responses in a future amendment.
- Sincerely, f
P.W. arriott, Manager
, Regulatory and Analysis Services l
L cc: F.A.' Ross (DOE)
D.C. Scaletti (NRC) '
D.R. Wilkins (GE)
J.F. Quirk (GE) 9008290004 900822 PDR ADOCK0500g5 A
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OUESTION 430.236 .
Since the service building is a nonsafety related structure, justify its inclusion in the list of locations of some electrical modules and cables performing a safety-related function and some safety-related valves and dampers of the HVAC systems. Also, justify nonsafety quality group classification for 'other safety related valves and dampers" for HVAC systems (see ABWR SSAR Table 3.2-1, Page 3.2-29).
- RESPONSE 430.236 ;
i These systems are for the technical support center. The technical support center requires equipment :
similar to safety-related equipment but are not classified as safety related components. Table 3.21 will be - j updated as indicated, j Per Reg Guide 1.26, systems such as HVAC are not covered by Ouality Group designation. l QUESTION 430.237 Explain the words 'high efficient section" occurring in SSAR Subsection 9.4.1.1.3, second paragraph. If the ..
above words mean HEPA filter, include it in SSAR Figure 9.4-1, and provide a table listing compliance status includingjustification for non-compliance with each of the applicable guidelines identified in Positions C.1 and C.2 of Regulatory Guide 1.140 for control building normal ventilation exhausts.
L RESPONSE 430.237 L
This filter is a medium grade bag type filter designed to remove dust and particulate matter. The sentence will be changed as indicated in Subsection 9.4.1.1.3. The component description table to be provided in a future amendment will reflect this change.
- QUESTION 430.238 l
1 Clarify whether (1) the two redundant safety related trains of the control room equipment HVAC system i are totally independent and whether each has 100 percent capacity and (2) the three subsystems of the essential electrical HVAC system (SSAR Subsection 9.4.1.2.3) are totally independent so that failure of any one i subsystem will not compromise the availabCty of the remaining two subsystems. Also, explain what Essential ;
l Chiller Room C (SSAR Subsection 9.4.1.2.3) means since the HECW system presumably has only two -
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l safety-related chiller trains.
l RESPONSE 430.238 (1) The two,100 percent, trains of HVAC equipment for the control room are totally independent. A P&lD will be provided in a future amendment. (2) The three trains of HVAC equipment for the essential electric equipment rooms are totally independent. A P&lD will be provided that shows this in a future
- amendment.
See " Submittal of Responses to Resolve Safety Evaluation Issues as Requested in NRC Letter from Dino C. Scaletti, May 1,1990", MFN No 06190, dated May 31,1990, Enclosure 3, Subsection 9.2.13 regarding the number of safety-related chiller trains.
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' QUESTION 430.239 Provide complete system P&lDs including safety classification changes (i.e., scismic category and quality group) for the control building IIVAC system (i.e., SSAR Sections 9.4.1.1 and 9.4.1.2). The P&lDs should show among other things (1) monitors located in the system intakes that are cable of detecting radiation and smoke, (2) capability for isolation of nonessential portions by two automatically actuated dampers in series and (3) provisions for isolation of the control room upon smoke detection at the air intakes. Also, provide complete flow diagrams for all modes of control building 11VAC system operation (i.e., normal, accident, smoke / toxic gas removal) showing among other things flow rates and component descriptior tables for the ;
l building 11VAC system (SSAR Figure 9.41 is illegible in parts and is also incompicie),
RESPONSE 430.239 An updated flow diagram (Figurc 9.4-1) and a new P&lD will be provided in a future amendment.
QUESTION 430.240 SSAR Subsection 9.4.1.1.3 states that the emergency recirculation system includes an electric heating coil whereas SSAR Figure 9.41 shows only a hot water system connection to a heating coil. The above figure additionally shows three IIECW divisions whereas SSAR Subsection 9.2.13 mentions only two ilECW divisions. Resolve the above inconsisancies. Also, clarify whether the normal recirculation unit and the hot water system are safety related, since their availability during the emergency mode of operation is vital to maintaining proper environmental conditions in the control roc'm and at the safety-grade filter train (Note that there is no description of the hot water system in the SSAR. This should bc provided).
RFSPONSE 430.240 i'
The entire control room IIVAC system is safety-related except for the hot water heating (fiWil) system.
The IIWII system is not necessary in an emergency. (Note, the IIWil system description will be included b a
- future amendment). HECW system consists of redundant subsystems in three divisions. (Sec " Submittal of Respona to Resolve Safety Evaluation Issues as Requested in NGC Letter from Dino C. Scaletti, May 1, 1997, MFN Mo 06190 dated May 31,1990, Enclosure 3, Subscetion 9.2.13).
QUESTION 430.241 Clarify whether the system air intakes are provided with tornado missile barriers.
L l RESPONSE 430.241 l
All safety related air intakes are provided with tornado missile barricts. Item (6) will be added to Subsection 9.4.1.1.1 and item (4) to Subsection 9.4.1.2.1 as indicated.
QUESTION 430.242 For the turbine building ventilation system, provide (1) complete system P&lD including safety classification changes and isolation and monitoring devices,(2) complete system flow diagrams showing
' description tables. Also, identify the corrective operator action following annunciation of alarms upon detcetion of high radiation in the building ventilation exhaust.
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- e i RESPONSE 430.242 '
A complete turbine building HVAC system P&lD, flow diagram update of Figures 9.4-2a & 2b and the- ,
identification of the corrective operator action following high radiation alarms will be provided in a future amendment.
- Only the reactor building portion of reactor / turbine building ventilation system is monitored for radiation.
There is an isolation signal for the contaminated portions. l l
QUESTION 430.243 :
. t For the reactor building ventilation system, provide the following:
QUESTION 430.243a
~s Complete system P&lDs including safety classification changes, isolation and monitoring devices for i secondary containm nt (e.g., radiation monitors in the secondary containment ventilation exhaust, spent fuel pool and essential equipment room area exhausts), essential electrical equipment, essential diesel generator,
> drywell purge and reactor internal pump control panel room HVAC subsystems. j RESPONSE 430.243a -
~ A complete reactor building HVAC system P&lD will be provided in a future amendment, QUESTION 430.243b Some of the SSAR Egwes (e.g., Figures 9.4-3,9.4-4) have illegible portions; there is no figure in the SSAR (1 for the mainsteam/feedwater tunnel HVAC subsystem; SSAR Figure 9.4-3 for secondary containment HVAC p subsystem does not show servicing of rooms housing redundant equipment for some essential systems; and the figures do not specify flow rates.' Provide enlarged and legible size complete flow diagrams showing flow rates l 1
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among other things for each subsystem (for guidance in contents for requested response, see GESSAR Il j HVAC system flow diagrams provided in the GESSAR Il SAR),
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RESPONSE 430.243b c 1
l Enlarged and legible size complete flow diagrams for each subsystem will be provided in a future L amendment.
- - QUESTION 430.243c 4 Component description tables for each subsystem.
RESPONSE 430.243c l-Component description tables for each subsystem will be provided in a future amendment. ;
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6 6 QUESTION 430.243d -
FMEA for each subsystem.
RESPONSE 430.243d As discussed in Section 15B.1, FMEAs are provided for two ABWR systems and one major component which present a significant change from past BWR designs. Specifically, FMEAs are included in Appendix 15B for:
(1) control rod drive system (with emphasis on the fine motion control rod drive),
(2) essential multiplexing system, and -
- (3) reactor internal pump. "
L Regulatory Guide 1.70 requires FMEAs to be performed on selected subsystems of Chapters 6,7 and 9.-
! However, GE considers that the plant nuclear safety operational analysis (NSOA) of Appendix 15A and the probabilistic evaluations of Appendix 19D adequately address single failures for those systems and components which are similar to past BWR designs. Since the designs of the ABWR }{VAC systems are similar to past designs, GE believes that it is unnecessary to perform FMEAs on the liVAC systems.
QUESTION 430.243e .
Description of isolation devices including safety classification, redundancy and source of power to the devices for all nonsafety-related ilVAC subsy:;tems that interface with safety-related structures, systems and components (SSC) (e.g., secondary conta'nment ilVAC subsystem, drywell purge supply / exhaust subsystem).
RESM)NSE 430.243e P&lDs showing system classifications and interfacing systems will be provided in a future amendment.
QUESTION 430.243f .
Specific design characteristics for meeting GDC 4 requirements for safety-related IIVAC subsystems.
RESPONSE 430.243f :
The specific design characteristics for meeting GDC 4 requirements for safety related ilVAC systems will L be provided in a future amendment.
l QUESTION 430.243g Table listing compliance status with each of the applicable guidelines of Regulatory Guide 1.140, Positions C.1 and C.2 including justification for non compliance for the normal ventilation exhausts from the secondary
! containment and drywell purge subsystems (SSAR Subsection 9.4.5.1.2 refers to filters in the secondary
!- containment normal exhaust system, but does not discuss what kind these are).
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RESPONSE 430.243g.
Regulatory Guide 1.140 is not a requirement for the normal HVAC system. SGTS system (Subsection 6.5.1) Regulatory Guide 1.140 compliance for the reactor building will be provided in a future amendment.
s QUESTION 430.243h Discussion of smoke removal operation for applicable dVAC subsystems including how the affected area will be isolated from other unaffected plant areas. Also, include the impact of applicable HVAC subsystems in safe or alterr. ate shutdown capability for a fire event in a plant area serviced by one of the applicable subsystems.
RESPONSE 430.243h I
Discussion of smoke removal operation for applicable HVAC subsystems will be provided in a future amendment.
- QUESTION 430.244 l
. ABWR Subsection 9.4.5.4.2 states that each divisional HVAC system consists of two power supply fans, two exhaust fans, and two recirculation units. However, SSAR Figure 9.4-4 shows only one recirculation unit per division. Also, the figure shows three HECW divisions supplying chilled water to the respective division room ;
coolers; but SSAR Section 9.2.13 describes only two divisions for the HECW system. Resolve the above discrepancies realizing that the safety-related support systems for three dicscl generators have to be completely
. Independent of each other.
RESPONSE 430.244
(= This should read two supply fans, two exhaust fans, and one recirculation unit. This will be updated as i: mdicated. See " Submittal of Respon ,es to Resolve Safety Evaluation Issues as Requested in NRC Letter from l .Dino C. Scaletti, May 1,1990", MFN No. 06190, dated May 31,1990. Enclosure 3, Subsection 9.3.13 regarding the number of safety-related chiller trains.
QUESTION 430.245 ,
Confirm that each supply and exhaust fan (of the essential electric equipment room HVAC System) mentioned above is a 100% capacity fan.
O RESPONSE 430.245 All fans of the essential electric equipment room HVAC System are 100% capacity fans. Subsection
- 9.4.5.4.2 will be updated as indicated.
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7' a,1 QUESTION 430.246 Discuss how the essential electric equipment HVAC subsystems meets GDC 17
- Electric Power Systems" ,
Jas it relates to the protection of essential electrical components of the subsystem from failure due to the
+ accumulation of dust and particulate materials (see SRP Section 9.4.5, Accc14ance Criterion 11.4 for required -
contents of response to this item).
RESPONSE 430.246 All three divisions are supplied with a medium grade bag type filter to remove dust and particulate matter e
- from incoming airstream. Intake structures are placed more than 9m (30 ft) above grade. See reactor building general arrangement drawings (Figures 1.211 and 1.212). Subsection 9.4.5.5.3 will be updated as indicated.
' QUESTION 430.247 ,
1 Subsection 9.4.5.4.5 does not discuss temperature control. Provide a discussion of the method and instrumentation provisions for temperature control.
RESPONSE 430.247 The method and instrumentation provisions for temperature control will be added to Subsection 9.4.5.4.5 as ;
indicated.
QUESTION 430.248 Provide a discussion of the means used for maintaining the rooms cooled by the essential electrical equipment HVAC system at positive pressure.
RESPONSE 430.248 l-1 Positive pressure is maintained by pushing more ali into the room than is pulled out by the exhaust fans. H This is achieved by sizing the inlet fans to be larger than the exhaust fans. This will be added to Subsection 9.4.5.4.1,1 as indicated.
QUESTION 430.249 Provide assurance that the air intake elevation for the essential diesel generator IIVAC system is greater than 20 feet above grade or discuss the methods for protecting electrical pancis from dust and particulate materials. (
RESPONSE 430.249 The ' diesel generator HVAC intake openings are located at elevation 18.5m (37.7 ft above grade). The l dicscl gcuerator HVAC exhaust openings are located at elevation 13.1m (20 ft above grade).
QUESTION 430.250 ABWR SSAR Subsection 9.4.5.5.2 states that the two supply fans for each of the three dicscl generators m ; take air froc. the outside and diatribute it to the dicscl generators. Chrify whether there is a common header for all the dicscl generators for intake air. If there is, justify such a design.
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RESPONSE 430.250 m Each dicscl generator HVAC subsystem has its own fans, intake ports and exhaust ports. These are shown -
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on the reactor building general arrangement drawings Figures 1.2-9 and 1.210.
QUESTION 430.251 Provide drawings for the drywell purge supply / exhaust system and a discussion of the interfaces to the secondary containment HVAC sysicm and to the standby gas treatment system.
RESPONSE 430.251 This subsystem will be included in the reactor building HVAC P&lD. This P&lD will show all interfaces.
The standby gas treatment system (SGTS) does not interface directly with any liVAC system. The SGTS X- system draws directly from within the secondary containment.
.s QUESTION 430.252 Discuss the sensor location and actuation setpoint for the exhaust radiation monitor for the drywell supply / exhaust system as they relate to preventing unanticipated radioactive releases.
RESPONSE 430.252 Sensor location will be shown on the P&lD to be included in a future amendment. The actuation setpoint for the radiation monitor will be shown in Table 11.51 in a future amendment.
QUESTION 430.253
. Sinec there are separate wetwell purge supply /cxhaust system for the ABWR, include a description of that system in the SSAR. Note that all the information requested abose for the drywell purge system should be included in the description of the wetwell purge system.
RESPONSE 430.253 There is only one containment supply / exhaust system. Its job is to supply or exhaust air it receives from the atmospheric control system. The drywell purge / supply exhaust system will be renamed the containment purge supply /cxhaust system. Subsection 9.4.5.6 will be updated as indicated.
QUESTION 430.254 ABWR SSAR Subsection 9.4.5.6.1.2 states that the drywell purge system only operates during plant shutdown. Correct the above statement since it will operate also during inerting, deinerting or pressure control of the primary containment. Also, discuss how both the dr>well and wetwell purge supply / exhaust subsystems together meet Branch Technical Position CSB 6-4 " Containment Purging During Normal Plant Operation."
RESPONSE 430.254 Subsection 9.4.5.6.1.2 will be updated as indicated for the containment purge supply / exhaust system.
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, s 5' I QUESTION 430.255 ABWR SSAR Subsection 9.4.5.1.2 states that two fan coil units provide cooling to the steam tunnel.
Explain how the air is cooled.
RESPONSE 430,255 The fan coil units consist of fans and a cooling coil supplied by the normal chilled water (IINCW) system, j The fan coil units work in the same way as the emergency fan coil units except these are manually turned on from the control room. A P&lD incorporating this arrangement will be provided in a future amendment.
1 QUESTION 430.256 ABWR SSAR Subsection 9.4.5.8.2 states that cach division of the reactu katernal pump (RIP) control '
panel room HVAC subsystem contains two recirculation units. This does not agree with Figurc 9.4 5 Resolve this discrepancy. !
RESPONSE 430.*56 Subsection 9.4.5.8.2 will be updated as indicated.
QUESTION 430.257 ABWR SSAR Subsection 9.4.5.8.3 addresses the nonessential equipment ilVAC system instead of the RIP control panel IIVAC system. Provide a safety analysis which addresses the proper system, including a discussion of the effects of loss of venti lation on the RIP control panel.
RESPONSE 430.257 This safety analysis is for the RIP control panel room. Subsection 9.4.5.8.3 will be updated as indicated. .
QUESTION 430.258 .
For the radwaste control room and balance of the radwaste building HVAC systems, provide (1) complete P&lDs showing safety classification changes, isolation and monitoring devices,(2) complete flow diagrams showing among other things flow rates, and (3) component description tables. Also clarify whether any affected space is isolated by safety related devices.
RESPONSE 430.258 .
Complete P&lDs, flow diagrams, component description tables for the radwaste control room IIVAC and balance of the radwaste building ilVAC system text will be addressed in a future amendment. In addition, clarification will be provided as to whether any affected space is isolated by safety related devices, i
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QUESTION 430.259 ABWR SSAR Subsection 9.4.6.2.2 states that one radwaste building IIVAC supply and exhaust fan are normally operating and the other of each type (i.e., for the radwaste control room and the balance of the' radwaste building)is on standby. SSAR Subsection 9.4.6.3 mentions provisions for automatic start of the . ;
standby unit. However, SSAR Subsection 9.4.6.5.2 indicates that only an alarm is actuated by low flow in the exhaust fan discharge duct, and that ventilation must be restarted manually. Clarify whether the standby fan is started on failure of the operating fan. If not, provide justification.
RESPONSE 430.259 ,
I Automatic startup of the backup fan is provided as indicated in revised Subsection 9.4.6.5.2.
QUESTION 430.260 ,
Provide a failure modes and effects analysis for the radwaste building HVAC system which shows that the normal direction of air flow from areas of low potential contamination to areas of higher contamination will not be reverd for the failure of any active component. :
RESPONSE 430.260 i See response to Question 430.243d. ,
.p QUESTION 430.261 For both of the radwaste building IIVAC system zone exhausts, provide tables listing compliance status -i includingjustification for non. compliance with each of the applicable guidelines identified in Positions C.1 and i C.2 of Regulatory Guide 1.140.
. RESPONSE 430.261 o The radwaste building HVAC exhaust is routed through the main plant stack. No air-treatment will be performed by this exhaust system. Subsection 9.4.6.2.2 will be updated as indicated.
QUESTION 430.262 4 i
.For the service building ventilation system, provide (1) complete system P&lDs including safety classification changes, isolation and monitoring devices, (2) component description tables, and (3) compliance with applicable guidelines of Regulatory Guide L140 for the system exhaust. Also, provide legible and t, enlarged portions of the SSAR Figure 9.4-7 which are currently illegible; include flow rates in the figure.
l RESPONSE 430.262
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The service building IIVAC system will be kept at the current flow diagram detail. All additional details "
are utility / site dependent and will be handled by the applicant referencing the ABWR design. Interface items .
i will be placed in a new Subsection 9.4.10 (Interfaces) and Section 1.9 in a future amendment. >
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-3 QUESTION 430.263 Provide enlarged and legible versions of the drywell cooling system P&lD (SSAR Figure 9.4 8).
, RESPONSE 430.263 - l An enlarged version of Figurc 9.4-8 is included with this submittal. I l
QUESTION 436.264 Identify the HVAC system that will service the remote shutdown panel area that will be used for prosiding -
alternate shutdown capability following certain fire events.
RESPONSE 430.264 ,
Division B of the control building essential electrical llVAC system will provide air cooling. Subsection 9.4.1.2.3.2 will be updated as indicated.
QUESTION 430.265 Identify interface requirements as they relate to lIVAC systems for plant arcas which do not fall within the ABWR design scope but which may impact the SSC that are within the ABWR scope. Also, provide interface requirements for the technical support center (TSC) FIVAC system.
L RESPONSE 430.265
- Allinterface requirements will be piaced in a new Subsection 9.4.10 (Interfaces) and Section 1.9 in a future -
l amendment.
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TABLE 3.21 - 1
- 7. " CLASSIFICATION
SUMMARY
(Con'tinued) '
Quality ,
Group; Quality Safety . loca- Classi. Assurance Seismic '
Principal Componenta Qasib g e- gd Requiremtal' Categorvf Natu - ;
i i
U2 Heating, Ventilating,and Air Conditioning Systems * (Continued) {
- h. Other safety related 3 ,RZ, - B 1 valves and dampers .
- l. Electrical modules with - 3 C,RZ, - B I
- f N
safety related function -
4 -
J. Cable with safety related 3 - B I ,.
function
- 2. Non safety related equipment ** l
!-. a. HVAC mechanical or N SC,RZ,H, - -- --
.m clectrical components X,SC,
, ' with non. safety related W,T ,
- l. functions :
l .' U3 Fire Protection System -
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p- 1. Pipingincluding supports and '
2 C B; .B I
, valves forming part of the - 3
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- primary containment boundary l,
2.1 - Other piping including supports N SC,C,X, D -- -
(t) (u) and valves RZ,H l 3 Pumps N F D -- ----
'(t) (u) 4, Pump motors -
N F - --- -- (t) (u).
5.' Electricalmodules N C,SC,X, - - --
(t) (u) -
RZ,H,-
T,W
- ^ includes thermalandradiologicalenvironmentalcontrolfunctions within the ABWR Standard Plant scope.
- Controls environment in rooms or areas containing non safety related equipment within the !
3 ,
, ABWR Standard Plant.
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. ABWR 2W1MAH
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Standard Plant _ _ _
Rev D -
' 9.4 AIR CONDITIONING (3) The outside design conditions for the control room X IlEATING COOLING AND HVAC system are 115 F during the summer and ;
ij VENTILAiION SYSTEMS
-40 F during the winter.
9.4.1 Control Building HVAC 9.4.1.13 System Description kJ4 The control room is heated, cooled and pressurized Qcontrol building HVAC system is divided
- into two g:: systems. A HVAC system for the by a recirculated air system with filtered outdoor air '
control room equipment on the top two floors. Plus for ventilation and pressurization purposes.- The a HVAC system for essential electrical and beat ex- recirculated air and the outdoor air will be mixed and hanger equipment. drawn through a filter section, a heating coil section, m and a cooling coil section. Under normal conditions, M N
,9.4.1.1 Control Room Equipm'at HVAC sufficient air is supplied to pressurize the control .
room and exfiltrate to pressurize the control building. g 9.4.1.1.1 Design Basis 4 The control building HVAC PFD is shown in (1) The Contre.,1 I o.sm heating, ventilating and Figure 9.41. The control building recirculation unit g air conditionir4 (HVAC) system is designed consists of a F0 6 a; d : , ; '.6,h ifCi k = 30 ,
with sufficient redundancy to ensure operation n a;.i H:; a cooling coil, two 50% cap?cQiry y rce, %
under emergency conditions assuming the supply fans. The supply fans are placed on low speed 7A 5 single failure of any one active component, when the system is in the smoke removal mode. 9 4 ee 6[.4ce (2) Provisions are made in the system to detect and Two 50% capacity return exhaust fans draw air 'o limit the introduction of airborne radioactive from the electrical area, corridors, control room, g4 materialin the control room, computer room, office areas, and the HVAC equip-ment room. This air is returned to the air condition.
(3) Provisions is made in the system to detect nd ing unit during normal operations. Modulating damp-
. remove smoke and radioactive materN from ers in the return duct work to the fans are controlled !
f the controt room. by a pressure controller to maintain the required I positive pressure. The controller is located in the .
(4) The HVAC system is designed to provide a electrical equipment area. During smoke removal controlled temperature environment to ensure mode, these fans are placed on low speed and the air I the continued operation of safety-related equip- is discharged to atmosphere. I ment under accident conditions.
An emergency recirculation system consisting of an (5) The HVAC system and components are to- electrical heating coil, a prefilter, HEPA filter, char-cated in a Seismic Category I structure that is coal adsorber, e.ad HEPA filter with a booster fan,is g
y tornado-missile and flood protected. j provided parallel to the normal mixed outdoor and g ( O Toro oc\o mud her*[provideJ return air path to the supply conditioning units. The mW charcoal adsorber will be 6 inches deep as a minimum.
4 9.4.1.1.2 Power Generation
% anc (1) The HVAC system is designed t$rovi c br.3 gh Design Basis Or{2pcuwThe syst hi radiation. A radioactivity tuonitoring system environment with controlled ternperature and monitors the building intakes for radiation. The humidity to ensure both the comfort and safety radiation monitor allows the control room operator to of the operators. The nominal design condi- select the safest intake. The makeup air for tions for the control room environment are pressurization can be diverted through the HEPA and 75 F and 50% relative humidity.- charcoal adsorbing system before distribution in the Control rcom areas.
(2) The system is designed to permit periodic in-spection of the principal system components. Smoke detectors in the control room and the con-trol equipment room exhaust systems actuate an
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j l Amendment it 9.41 l
T ?ABWR - mowi ' ,
. ' Standard Plant wn- -
r alarm on indication of smoke. Dampers must be po- The safety related isolation valves at the outside air ' ,
sitioned through a remote manual switch to allow the ~ intakes are protected from becoming inoperable due exhaust air fans *o e:haust 100% of the conditioned to freezing, icing, or other environmental conditions, f~
air. ';
9.4.1.1.5 Inspection and Testing Requirements The HVAC equipment space is physically sepa-rated into divisional rooms. Each divisional room Provi. ions are made for periodic tests of the out-consists of an air intake room and an air exhaust door ait cleanup fans and tilters. These tests include room. determinations of differential pressure across the-filter and of filter efficiency Connections for testing, 9.4.1.1.4 Safety Evaluation- such as injection, sampling and monitoriag are prop- i J
erlylocated so that test results are indicative of per-The control building HVAC System is designed to formance. 3 maintain a habitable environment and to ensure the a operability of components in the control room. All Tbc high efficiency particulate air (HEPA) filters .l '
control room HVAC equipment and surrounding may be tested periodically with dioctyl phthalate
'I structures are of Seismic Category 1 design and oper _ smoke (DOP). The charcoal filters may be periodi-able during loss of the offsite power supply, cally tested with freon for bypasses.
The ductwork which services these safety functions The balance of the system is proven operable by its l
is termed ESF ductwork, and is of Seismic Category use during normal plant operation. Portions of the I design.' ESF ducting is high pressure safety grade system normally closed to flow can be tested to ductwork designed to withstand the maximum posi- ensure operability and integrity of the system.
tive and/or negative pressure to which it can be sub- ;
jected under normal or abnormal conditions. Galva- 9.4.1.1.6 Instrumentation Application [
nized steel ASTM A526 or ASTM A527 is used for outdoor air intake and exhaust ducts. All other ducts The area exhaust fan is started manually and the fan i
are welded black steel ASTM A570, Grade A or discharges the air to atmosphere, ..
Grade D. Ductwork and hangers are Seismic Cate-g gory I. Bolted flange and welded joints are qualified A high radiation signal automatically stans the out- :3 y . per ERDA 76-21. door air cleanup system, closes the normal air inlet
- dand d b y M qcndud
- damper and closes the exhaust air dampers, h' Redundan(components are provided where neces, sary to ensare that a single failure will not preclude A temperature indicating controller senses the tem-1 adequate control room ventilation. perature of the air leaving the air cleanup system.
l The controller then irqdulates an electric heating coil l A radiation monitoring system is provided to to maintain the leavisg air temperature at a preset p detect high radiation in the outside air intake ducts, limit. A limit switch w11 cause an alarm to'be actu-l A radiation monitor is provided in the control room uted on high air temperature. A moisture- sensing to monitor control room area radiation levels. These element working in conjunction with the temperature
! monitors alarm in the control room upon detection - controller measures the relative humidity of the air R of high radiation conditions. Isolation of the control entering the charcoal adsorber.
room and initiation of the outdoor air cleanup unit fans are accomplished by the following signals: Differential pressure indicators show the pressure drop across the prefilters and the HEPA filters. A
.(1) high radiation in the outside air intake duct, differential pressure indicating switch also measures and the pressure drop across the entire filter train. The
! (2) manual isolation. switch causes an alarm to be actuated if the pressure l drop exceeds a preset limit. A flow switch in the out-Under normal conditions, sufficient air is supplied door air cleanup system fan discharge duct automati-to pre'ssurize the control room and exfiltrate to pres- cally starts the standby system and initiates an alarm surize the Control Building. on operating fan failure.
O Amendment 5 9A.ta
ABWR n^sim^1:
'm Standard Plani RevJ 6- i
'. The electrical equipment area and the control room area return exhaust fans start automatically the heater and demisters. The heaters and demisters are put into systems to regulate the relative humidity . .
j .
when the air conditioning unit is started. Each fan of the air as it enters the ESF filter train. Since the i control room air handling units are designed to -
f inlet damper is open automatically. The exhaust E dampers to the conditioning unit are opened - maintain the control room temperature and humidity .
. automatically. within limits, additional controls are not necessary for the ESF filter train.
Differential pressure indicating controllers )
.modulatelate dampers in the return air ducts to - 9.4.1.1.8 Standard Re' view Plan 6.5.1 L. ,diance maintain space positive pressure requirements. Status In the event of an alarm from the smoke detection The control room ESF system complies with SRP system, the exhaust fans are placed in the smoke re. 6.5.1. Table 6.5.11. The only exceptions are for moval mode manually If th electrical equipment heater and moisture separator instrumentation area is to be exhausted, the smoke removal exhaust requirements. Since these components are not damper switch is actuated. The air conditioning unit necessary for the ABWR design, no instrumentation supply fans and the eletrical equipment room ex- has been supplied to monitor their operation.
i haust fans are automatically put in the low speed po- Relative humidity and temperature of the inlet air is sition, the exhaust damper is opened and the return maintained by the control room air handling system, air damper to aircondotioning unit closed. The area differentail pressure indicating controller goes 9.4.1.2 Essential Electrical and Reactor Building I
- to full open position during the smoke removal Cooling Water Equipment IIVAC mode.
9.4.1.2.1 Design Basis The cooling unit starts automatically on a signal from the temperature indicating controller installed (1)The heating, ventilation and air conditioning in the HVAC room. The controller modulates a (HVAC) system is designed with sufficient s . three way chilled water valve to maintain the space redundancy to ensure operation under conditions. emergency conditions assuming the failure of any one active component.
During winter, the electric unit heaters are cycled . .
1 by temperature indicating controller switches, (2)The HVAC system is designed to provide a l located within the filter rooms and the air handler controlled temperature environment to ensure i rooms. the continued operation of safety related '
equipment under accident conditions, s The supply and return air duct work has manual R balancing dampers provided in the branch ducts for .(3) The HVAC system and components are located f l
I . balancing purposes. The dampers are locked in in a seismic Category I structure that is W D
- place after the system is balanced, tornado missle and flood protected, g ThnM rness.h bdm3 frn o chel E in % ,y 9.4.1.1.7 Regulatory Guide 1.52 Compliance Status 9.4.1.2.2 Power Generation De.ign Basis eMud Oda
' The control room ESF filter trains comply with (1) The HVAC system is des:gned to provide an -
i all applicable provisions of Regulatory Guide 1.52, emironment with controlled temperature during Section C except as noted below, normal operation to ensure the comfort and safety of plant personnel and the integrity of the The revisions of ANSI N509 and N510 listed in essential electrical and RBCW equipment.
Table 1.8-21 are used for ABWR ESF fliter train design; the Regulatory Guide references older (2) The system is designed to facilitate periodic revisions of these standards. inspection of the principalsystem components.
1.
The control room ESF fliter trains are in compliance with the system design criteria except for Amendment 11 9.4.lb
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23xsiooxn . .
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(3); Design outside air temperature for the heat ' -
exchanger building HVAC system are 115 F
.{-
during the summer and -40 F during winter.' -
u 1 L 9.4.1.2.3 System Description -
l1 j
.\1 The essential electrical HVAC System is divided - !
['I"g"f l:
into 3f% 4 systems with esca subsystem serving a des- '
Ignated area. Each Subsystem serve as essential elec-
- 0 trical heat exchanger equipment HVAC for divisions > !
u ^W A, B, and C. .
9.4.1.2.3.1 Safety Related Subsystem 1 i
System 1 specificaPy serves:
I i
l l (1) Safety related battery rooms 1 and 4,
-(2) Essential chiller room A, .
(3) RB cooling water pump and heat exchanger room A, . t
- 1. ,
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~ (4)_ HVAC equipment room, L (5) Safety r elated electrical equipment room, h
(6) Passages, ' h,s ,l
. (7) : Noe essential battery room.
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[ s Recirculation unit for subsystem 1 consists of a (4) HVAC equip:acnt room, prefilter section, a high efficient filter section, an
- electric heater, a cooling coil, and two 50% capacity . '(5) Safety related electrical equipment room, -
supply fans. The supply fans are placed on low speed when the fans are in the smoke removal (6) Passages, .
mode. -
(7) SGTS equipment at EL 7200in CB.
Two 50% capacity return exhaust fans draw air -
from safety related battery rooms. During smoke re- Recirculation unit for subsystems 3 consist of a moval mode, the fans are : faced on low speed and prefilter section, a high efficient filter section, an elec- l the air is dascharged to atmuphere. tric heater, a cooling coil, and two 50% capacity J supply fans. The supply fans are placed on low speed -
9.4.1.23.2 Safety Related Subsystem 2 when the fans are in the smoke removal mode.
Subsystem 2 specifically serves: Two 50% capacity return exhaust fans draw air ,
from the safety-related battery rooms, During smoke temoval mode, the fans are placed on low speed and ;
(1) . Safety related battery room 2, the air is discharged to atmosphere.
(2) Essential chiller room B, ,
9.4.1.2.4 Safety Evaluatloa (3) RB cooling water pump and heat exchanger room B, The esscotial electrical HVAC system is designed to ensure the operability of the essential electrical equip.
(4) HVAC equipment room, ment, and to limit the hydrogen concentration to less 9 than 2% by volume in the battery rooms. All 6 (5) Safety related electrical equipment room, safety-related HVAC equipment and surrounding structures are of sumic category I design and (6) Passages, operable during loss of the offsite power supply, (7) Non essential electrical equigment rooms. The ductwork which services these safety functions is termed ESF ductwork, and is of Seismic Category I y
- h(x- (q R -unitte.for h Recirculation t h h2 /consist subsystem A m, of a design. ESF ducting is high pressure safety grade L Q prefilter section, a high efficient filter section, an ductwork designed to withstand the maximum positive F electric heater, a cooling coil, and two 50% capacity and/or negative pressure to which it can be subjected supply fans. The supply fans are placed on under normal or abnormal conditions. Galvanized ,
low speed when the fans are in the smoke removal steel ASTM A526 or ASTM A527 is used for outdoor mode. ' air intake and exhaust ducts. All other ducts are welded black steel ASTM A570, Grade A or Grade
. Two 50% capacity return exhaust fans draw air D. Ductwork and hangers are Seismic Category I.
from the safety related battery rooms. During Bolted Flange and welded joints are qualified per smoke removal mode, the fans are placed on ERDA 76 21.
Iow speed and the air is discharged to atmosphere.
Redundant components are provided where neces-9.4.1.2.3.3 Safety Related Subsystem 3 sary to ensure that a single failure will not preclude adequate heat exchanger building ventilation.
Subsystem 3 specifically serves:
9.4.1.2J Inspection and Testing Requirements (1) Safety related battery room 3, Provisions are made for periodic tests of the out-(2) Essential chiller room C, door air cleanup fans and filters. These tests include determinations of differential pressure across the (3) RB cooling water pump and heat exchanger filter and of filter efficiency. Connections for testing, room C, such as injection, sampling and monitoring are prop-Amendment to 94 It
s ABWR1 '
234sioarn p f. +
V Standard Plant wn i.
I ^, # - 9.45 Radwaste Building HVAC System system. The air conditioning system is a , unit alt conditioner consisting of a water cooled i w , 9.4.6.1. Design Bases condenser, compressor, cooling coil, heating coil,-
c filters and fan.. Outdoor air and recirculating air are 9.4.6.1.1 Safety Design Bases mixed and draw- through a prefilter, a heating coil, a cooling coil, and two 100% supply fans. One fan is
'Tne radwaste building IIVAC system has no normally operating and the other fan is onstandby. A safety related function as defined in Section 3.2. pressure differential controller regulates the i Failure of the system does not compromise any exfiltration from the control romo to maintain it at a
, safety related system or component and does not positive static pressurc, preventing airtorne ,
l; prevent safe reactor shutdown. Provisions are contamination fiom entering, i incorporated to minimize release of radioactive I substanc:s to atmosphere and to prevent operator The exhaust air system consists of two 100%
exposure, exhanst fans. One fan is normally operating and the ,
other is on standby. Exhaust air from the control- j 9.4.6.1.2 Power Gen ration Design Bases room is monitored for airborne radioactivity before !
!~ exhausting to the atmosphere.
The radwaste building ventilation system is designed to provide an emironment with controlled 9.4.6.2.2 Radwaste Building HVAC Control System temperature and airflow patterns to insure both the comfort and safety of plant personnel and the The HVAC control system for the remainder of the integrity of equipment and components. The radwaste building is a once through type. Outdoor air radwaste building is divided into two zones for air is filtered, tempered and delivered to the conditioning and ventilation purposes. These zones noncontaminated areas of the building. The supply are the radwaste control room and the balance of the air system consists of a prefilter, heating coil, cooling radwaste building. coil, and two 100% supply fans. One fan is normally operating and the other fan is on standby, The supply
. A positive static pressure with respect to the fan furnishes conditioned air through ductwork and -
balance of the building and to atmosphere is diffusers, or registers to the work areas of the l maintained in the radwaste control room. The building. Zone preheat coils installed in the supply balance of the radwaste building is maintained at a air ductwork provide temperature control. Air from negative static pressure with respect to atmosphere. the work areas is exhausted through the tank and pump rooms. Thus, the overall airflow pattern is
%i huo m unubin ' :-'^ mmmon-header from the hast potentially contaminated areas to the
=:=' 9=;;h a charcoal-edsosher-unit- most contaminated areas, i
The system design is based on outdoor summer . The exhaust air system consists of two 100%
maximum gf 115 F. Summer indoor temperatures exhaust fans, one normally operating and one on include 75 Fin the radwaste control station,93 Fin standby. Exhaust air from the silo, waste filter rooms, I'
operating areas and cortidors, a maximum oil separator room and the mixing and filling station is temperature of 104 F in areas that may be occupied monitored for airborne radioactivity. Under normal and 110 F in the equipment cells. Winter indoor conditions with no contamination, normal ventilation design temperatures include 60 F in occupied areas, in the same circuit as the other spaces in the building 70 F in the radwaste control room and 60 F in the is maintained. Each of,the above noted spaces is equipment cells6based on an outdoor design separately monitored. A high level of radioactisity temperature of 40 F. activates an alarm in the main control room, simultaneously isolating the effected space.
9.4.6.2 System Description tafritration-air-hrthc cifwdipace-or-spacet-it enhausted-to-the vent stacle after-being cleaned up-in1r-9.4.6.2.1 Radwaste Building Control Room -filter-train consisting-of-a prefilter;-a-HEPA-filter,-
activatedtbarcoal filter rand-a-second-HEPA-filter:-
Heating. cooling and pressurization of the control The-resulting clean-air is exhausted 40-the-vent-stack- s
%= N room are accomplished by an air-conditioning
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9.4.63 Safety Evaluation- building are started manually. The fan inlet dampers .
- open when the fan is started.- A flow switch installed M Although the HVAC system is not safety.related as' in the exhaust fan discharge duct actuates an alarm on - T j-defined in Section 3.2, several features are provided - ludication of fan failure in the main and radwaste to insure safe operation. A completely separate control roomsV4 u/"-%: f :huadwestab" TWT "O
HVAC System is provided for the control room, ;...: 5 ::med --11y The exhaust fan is yi "
Pressure control fans for radwaste areas are interlocked with the supply fan to prevent the supply redundant,with provision for automa% start of the ' '
fan from operating if the exhaust fan is shutdown, standby unit. Radiation detectors and isolation
. dampers are provided to permit isolation and Two pressure indicat. ig controllers modulates g bg.t'
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- containment of any radioactive leakage, variable inlet damper vanes in the supply fan to maintain the area at a negative static pressure with 9.4.6.4 Tests and Inspections respect to atmosphere. The switch causes an alarm to be actuated if the negative pressure falls below the The system is designed to permit periodic preset iimit.
inspection of important components, such as fans,
- motors, belts, coils, filters, ductwork, piping and Differential pressure indicators measure the valves, to assure the integrity and capability of the pressure drop across the prefilter section and the ,
system < Local display and/or indicating devices are -MEP^ NI'a* : !!ee ^ . d i f f c ; e n-t+a4 provided for periodic inspection of vital parameters 7 er: I:9rting r;.i:d muses-the-psessure.dsop such as room temperature, and test connections are -- "" '"ter-section. The switch causes provided la exhaust filter trains and piping for an alarm to be actuated if the pressure drop exceeds periodic checking of air and water flows for the preset limit, conformance to the design requirements. Portable test and monitoring equipment is available to Radiation monitors are installed in the radwaste balance the system when required. building vent. A high radiation signalin the vent causes both a summing alarm and an audible alarm to 4CPA fikors.ars tosted-by-using-dioetyFphthalate emunciate in the main control room with an audible alarm sounding and a display light showing on the -'
-(DOP.J. aerosol >b"ennl filters =c FM ~E ""
m=:9sk r, con for-bypasses-- radwaste building HVAC control panel. In addition,
- l. the branch high radiation signal automatically closes 9.4.6.5 Instrumentation Application the branch. isolating damper so that air conditionint is continued in the ba'ance of the building.
9.4.6J.1 Radwaste 11ullding Control Room If the vent high radiation ala'rm continues to The air. conditioning unit for the control room is annunciate, the work area branch ducts are manually started manually. A temper,ture indicating isolated selectively to locate the affected building L controller modulates the air conditioning system via area. Should this technique fail, because the airborne a three way hot water valve to maintain space radiation has generally spread throughout the conditions, a differential pressure indicating building, control room air conditioning continues !
controller modulates dampers in the return air operating. However, the air conditioning for the for ductwork and the room damper to maintain the the balance of the building is shut down. The opera-positive static room pressure. Differential pressure tors, using approved plant health physics procedures,
- Indicators measure the p'ressu.e drop across the then enter the work areas to locate and isolate the
.p+efilter bank :n' 'h: HEPA finci bank, A leakage source. ,
..m... . y. _surc-iaSc6m3 Mtch-measures the ,
p .w.v bp eeress-the-complete-fikechole,-N- The supply and exhaust air ductwork have manually
- l .etes-ar. a!a.ai 14he-pressu.s wcedr
- he balancing dampers provided in the branch ducts for per' % balancing purposes. The dampers are locked in place .
after the system is balanced.
9.4.6.5.2 Radwuste llullding Work Areas The air exhaust and supply fans for the radwaste Amendment 6 9.4-2k i
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9008280004-0/ 88 195 750 Figure 9.4-8 DRYWELL COOLING SYSTEM PalD Amendment 6 9.44