NSD-NRC-97-5087, Consolidates Responses & Resolutions of Items Associated W/Ssar Section 9.4.Completion of Submittal of Final Documentation Related to SSAR Section 9.4 for Application for AP600 Design Certification,Confirmed
| ML20138D444 | |
| Person / Time | |
|---|---|
| Site: | 05200003 |
| Issue date: | 04/25/1997 |
| From: | Mcintyre B WESTINGHOUSE ELECTRIC COMPANY, DIV OF CBS CORP. |
| To: | Quay T NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| DCP-NRC0829, DCP-NRC829, NSD-NRC-97-5087, NUDOCS 9705010124 | |
| Download: ML20138D444 (57) | |
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i Westinghouse Energy Systems Ba 355 Electric Corporation Pinsburgh PennsyNania 15230 0355 NSD-NRC-97-5087 DCP/NRC0829 Docket No.: STN-52-003 April 25,199'/
Document Control Desk U. S. Nuclear Regulatory Commission Washington, C,20555 ATTENTION: T.R. QUAY
SUBJECT:
AP600 DESIGN CERTIFICATION: FORMAL NOTIFICATION OF RESOLUTION OF ITEMS ASSOCIATED WITH SECTION 9.4.
References:
1.
SECY-97-051, " Schedule for the Staffs Review of the AP600 Design Certification Application," dated February 26,1997, fe warded by NRC letter
" Westinghouse's Support of the Nuclear Regulatory Commission Review of the AP600 Design Certification Review," dated March 6,1997, 2.
Letter, T. R. Quay to N. J. Liparuto, Subject, " Staff Update to Open items (Ols) and Request for Reinstatement of Deleted Information Regarding Section 9.4 of the Westinghouse AP600 Standard Safety Analysis Report (SSAR)," dated October 17,1996.
Dear Mr. Quay:
This letter is to formally consolidate responses and resolutions ofitems associated with SSAR Section 9.4 and to confirm completion of submittal of final documentation related to SSAR Section 9.4 for our application for AP600 Design Certification. Reference 1 includes a milestone " Applicant Submits Final SSAR Revision & Documentation" by May 1997. Westinghouse interprets this to require NRC i
acknowledgement of receipt of final documentation supporting our application for AP600 Design Certification. To support this milestone, NRC and Westinghouse maintain a detailed activity plan which provides schedule goals for most SSAR/FSER sections and related activities, such as, the PRA, code validation, and ITAACs. In this detail activity plan, Westinghouse application input and NRC internal FSER input for Section 9.4 of the SSAR has a schedule goal of May 15,1997. NRC and Westinghouse also maintains a joint open item tracking system to informally monitor the status and history of open items (DSER, RAI, meeting, and other) associated with our application.
This letter with its attachments provides answers and resolutions to the questions and comments in the Reference 2 letter. Attachment I to this letter provides the chronology for each item discussed. Some of the material responding to the Reference 2 letter has been sent previously and is referenced in
_. Attachment 2 provides marked up pages incorporating proposed changes to Section 9.4
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9705010124 970425 PDR ADOCK 05200003.
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DCP/NRC0829 April 25,2997 1
of the SSAR resulting from the items identified on Attachment 1 and incorporates recommendations of 1
the Reference 2 letter as well as other proposed changes. Attachment 3 is the marked up pages for Section 9.4 that are affected by our design change decision to include the Radiation Chemistry l
Laboratory subsystem within the Auxiliary / Annex Building Subsystem. The changes involved in both Attachments 2 and 3 will be included in Revision 12 of the SSAR.
4 Based upon responses provided for Section 9.4 of the SSAR and a review of the related open item entries in our informal tracking system, Westinghouse confirms its completion of the submittal of j
information to support this portion of our application.
i i
If you have any comments or questions on this letter please contact J. W. Winters (412-374-5290) or D. A. Lindgren (412-374-4856).
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Brian A. McIntyre, Manager i
Advanced Plant Safety and Licensing i
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- : Chronology for Responses and Marked Up Pages for Section 9.4 of the SSAR : Marked Up Pages for Section 9.4 of the SSAR j : Markup for Incorporation of Rad Chem Lab Subsystem into the Auxiliary / Annex 3
Building Ventilation Subsystem i
cc:
D. Jackson, NRC i
N. J. Liparulo, Westinghouse (w/o Attachments)
T. T. Martin, NRC (w/o Attachments) 4 1
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Sheet 1 of 5 ATTACHMENT 1 TO NSD-NRC-97-5087 CHRONOLOGY OF RESPONSES AND MARKED UP PAGES FOR SECTION 9.4 OF THE SSAR ITEM ANSWERS MATERIAL IS IN NUMBER IN OITS SSAR, REV. 11, MARK UP PAGES OF SSAR, NRC LE' ITER NUMBER TYPE DATE PAG E-REVISION 11, PROMISED i
1.a.
TABLE 9.4 NEW SIIEETS 6 & 7 1.b 9.4.2.? I TEXT PAGES ONLY 1.c.
TABLE 9.4.3 NEW SIIEETS 2 & 3 9.4-2 PLUS FIG. 9.4.2-1 NEW SHEETS 3 1.d.
&4 1.e.-l NO FIGURE REQUIRED 9.4.8 IS ON PAGE 9.4-50 AND 9.4.11 IS 1 e.-2 ON PAGE 9.4-67 9.4-17,-19,-28,-30, 2.a.
FAX 2/20/97
-51,-57, -68,-81 2.b.
264 FAX 2/21/97 9.4-15 3.m.
FAX 1/26/97 9.4-43 3.b.
FAX 1I/26/96 9.4-56 IIARD 9.4-56 AND 4.
COPY I1/18/96 TIIROUGIIOUT 9.4 5.a.
MARK UPS OF PAGES 9.4-7, -8, -45, -46 5.b.
FAX 1/15/97 p.4-53, -58, -70
%.4-9, -21, -32, -46, 5.c.
FAX 1/15/97
-53, -64, -70 5.d.
FAX 1/13/97
,9.4-20
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Sheet 2 of 5 CHRONOLOGY OF RESPONSES AND MARKED UP PAGES FOR SECTION 9.4 OF THE SSAR ITEM ANSWERS MATERIAL IS IN NUMBER IN OITS SSAR, REV.
11, MARK UP PAGES OF SSAR, NRC LETTER NUMBER TYPE DATE PAG E-REVISION 11, PROMISED 5.e.
FAX 1/16/97 9.4-53, -70 NSD-NRC-5.f.
293 97-4932 1/7/97 5.g.
FAX 1/13/97 f.4-45 l9.4-9, -14, -15 12/27/96 5.h.
FAX 12/31/96 6.a.(1)
MARK UP OF PAGE 9.4-5 6.a.(2) 9.4-10,-11 6.a.(3)
MARK UP OF PAGES 9.4-10,-11, -12 6.m.(4)
- 9.4-11 NO CilANGE REQUIRED. SYSTEM ISOLATES MAIN CONTROL ROOM ON APPROPRIATE RADIATION 6.a.(5)
SIGNALS 6.a.(6)
MARK UP OF PAGE 9.4-13 6.a(7)
MARK UP OF PAGE 9.4-14 NO CHANGES REQUIRED - TIIIS IS UNNECESSARY DETAIL FOR THE 6.a.(8)
SSAR l
NO CHANGES REQUIRED - TIIIS IS UNNECESSARY DETAIL FOR THE 6.a.(9)
7 a
Sheet 3 of 5 CHRONOLOGY OF RESPONSES AND MARKED UP PAGES FOR SECTION 9.4 OF THE SSAR ITEM ANSWERS MATERIAL IS IN NUMBER IN OITS SSAR, REV. 11, MARK UP PAGES OF SSA11, NRC LETTER NUMBER TYPE DATE PAG E-REVISION 11, PROMISED 6.b.(1) l MARK UP OF PAGE 9.4-17 NON-lE BATTERY ROOMS DON'T 6.b,(2)-1 IIAVE ELECTRIC REllEAT COILS i
f 6.b.(2)-2 9.4-18 NON-lE BATTERY ROOMS DON'T 6.b.(3) liAVE ELECTRIC REllEAT COILS 6.b.(4)
MARK UP OF PAGE 9.4-25 6.c.(1) 9.4-28 6.c.(2)
MARK UP OF PAGE 9.4-30 6.c.(3) 9.4-33 6.d.(1)
MARK UP OF PAGES 9.4-43,-48 6.d.(2) l MARK UP OF PAGE 9.4-48 NO CHANGES REQUIRED - THIS IS UNNECESSARY DETAIL FOR THE 6.d.(3)
SSAR 6.e.(1) l NO FIGURE REQUIRED 6.e.(2) l MARK UP OF PAGE 9.4-54 6.e.(3)
I MARK UP OF PAGE 9.4-54 6.f.(1)
NO FIGURE REQUIRED 7.a.(1) 2897 FAX 12/9/96
,lVARIOUS IN 9.4 7.a.(2) 261 FAX 12/9/96 p.4-7
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Sheet 4 of 5 CHRONOLOGY OF RESPONSES AND MARKED UP PAGES FOR SECTION 9.4 OF THE SSAR ITEM ANSWERS MATERIAL IS IN NUMBER IN OITS SSAR, REV.
II, MARK UP PAGES OF SSAR, NRC LETTER NUMBER TYPE DATE PAGE-REVISION 11, PROMISED 7.a.(3)
FAX 1/17/97 9.4-8, -71 B 9.4-2, -10, -11, AND 7.a.(4) 2890 FAX 12/17/96 6.4-1 TECII. SPEC. 3.7.6
& SSAR TABLE 3.9-7.a.(5) 263 FAX 12/6/96 17 7.a.(6)
FAX 12/9/96 9.4-11 7.a.(7) 264 FAX 2/21/97 9.4-15 7.b.(1) 270 9.4-17,-19 7.b.(2) 269 FAX 4/8/97 RESOLVED 7.b.(3)-1 271 FAX 4/8/97 MARK UP OF PAGE 9.4-17 7.b.(4) 272 RESOLVED 2/21!97 7.b.(5) 266 FAX 4/15/97 MARK UP OF PAGE 9.4-19 7.b.(6) 273 FAX 12/9/97 9.4-19 7.b.(7) 267 FAX 4/7/97 9.4-19 7.b.(8) 274 FAX 4/7/97 9.4-19 7.c.(1) 284 FAX 12/Ui96 9.4-33 7.c.(2) 281 TABLE 3.2-3 7.c.(3) 282 FABLE 3.2-3 I
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a oh SHEEf 5 of 5 CHRONOLOGY OF RESPONSES AND MARKED UP PAGES FOR SECTION 9.4 OF THE SSAR ITEM ANSWERS MATERIAL IS IN NUMBER IN OITS SSAR, REV.
II, MARK UP PAGES OF SSAR, NRC LETTER NUMBER TYPE DATE PAGE-REVISION 11, PROMISED 5.4-31 &
7.c.(4) 275, 276 FAX 12/11/96 l TABLE 3.2-3 7.c.(5) 279 9.4-30 7.c.(6) 283 TABLE 3.2-3 7.d.(1) 285 FAX 4/11/97 TABLE 3.2-3 7.d.(2) 287 FAX 12/26/96 9.4-39
'7.e.(1) 291 FAX 4/16/97 9.4-43 7.e.(2) 289 FAX 4/1I/97 TABLE 3.2-3 4/10/97 7.f.(1) 292, 293 FAX 4/16/97 TABLE 3.2-3 l
7.f.(2) 294,295,296
'9.4-51 9.4-57 &
7.g.(1) 298 FAX 4/16/97 TABLE 3.2-3 Th.(1) 301 8.3-7 1/9/97 7.h.(2) 300 FAX 4/16/97 MARK UP OF PAGE 9.4-62 1/28/97 7.i.(1) 304 FAX 4/16/97 FIG. 9.4.4.7-1 7.i.(2) 302. 305 TABLE 3.2-3
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1 to NSD-NRC-97-5087 Marked Up Pages for Section 9.4 of the SSAR I
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- 9. Auxulary Systems iMi
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kitchen / rest area, and restrooms. De main control room and technical support centei toilets j
have separate exhaust fans.
4L+& $hlM [h Outside supply air is provided to t e plant areas served by the main contal room / technical support center ilVAC subsystem thr ugh an outside air intake duct that is protected by an intake enclosure located on the too of the auxiliary building at elesation 153'-0". ne jg supply, return and toilet exhaust ducts that penetrate the main conwo( room envelopdinclude g
redundant safety-related seismic Category I isolation dampers tha; are physically located within the main control room envelope. Redundant safety-related radiation tronitors are located inside the main control room upstream of the supply air isolation &mp.rs. Rese monitors initiate operation of the nonsafety related supplemental air filtration un is on high gaseous radioactivity concentrations and isolate the main control room from the nuclear island nonradioactive ventilation system on high particulate or iodine radioactivity concen! rations.
See Section 11.5 for a description of the main control room supply air radiation monitors.
Both redundant trains of supplemental air filtration units and one train of the supply air handling unit are located in the main control room mechanical equipment room at elevation l
135'-3"in the auxiliary building. The other supply air handling unit subaystem is located in the main control room mechanical equipment room at elevation 135'-3"in the annex building.
The main control room toilet exhaust fan is located at elevation 135'-3" in the auxiliary building. A humidifier is provided for esch supply air handling unit. The supply air handling unit cooling coils are provided with chilled water from air-cooled chillers in the central chilled water system. See subsection 9.2.7 for the chilled water system description, l
The main control room / technical support center HVAC subsystem is desiped so that smok:,
hot gases, and fire suppressant will not nugrate from one fire area to another to the extent that they could adversely affect safe shutdown capabilities, including operator actions. Fire or combination fire and smoke dampers are provided to iso! ate each fire area from adjacent fire areas during and following a fire in accordance with NFPA 90A (Reference 27).;quirements.
Rese combination smoke / fire dampers close in response to smoke detector signals or in response to the heat from a fire. See Appendix 9A for identification of fire areas.
9.4.1.2.1.2 Class IE Electrical Room HVAC Subsystem De Class IE electrical room HVAC subsystem serves the Class IE electrical rooms. Class IE instrumentation and control (1&C) rooms, Class IE electrical penetration rooms, Class IE banery rooms, spare Class lE banery room, remote shutdown area and reactor coolant por p trip switchgear rooms. He A and C e!ectrical divisions, spere battery room, and reactor cov' ant pump tiip switchgear roorcs are served by one ventilation subsystem; the B and D clectrical divisions and remote shutdown workstation area are served by a second vctailaticn subsy stem.
Each subsystem consists of two 100 percent capacity supply air handling units, retum/ exhaust sir fans, associated dampers, controls and instrumentation, and common ductwork. The supply air handling units and retum/ exhaust air fans are connected to a common ductwork which distributes air to the Class lE electrical rooms, he outside supply air intake enclosure k
Revision: 11 W y/est]0gl10US8 9.4-5 February 28,1997 o
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i The exhaust fan draws outside air through an intake louver damper and directly exhausts to the environment.
p 9A.I.2.2 Component Description l
The nuclear island aonradioactive ventilation system is comprised of the following major components. These components are located in buildings on the Seismic Category i Nuclear l
Island and the Seismic Category 11 portion of the annex building. The scismic design classification, safety classification and principal construction code for Class A, B, C, or D 3
components are listed in Section 3.2. Tables 9.4.1 1, 9.4.1-2 and 9.4.1-3 provide design parameters for major components in cach subsystem.
Supply Air Handling Units l
Each air handling unit consists of a mixing box section, a low efficiency filter bank, high
)
efficiency filter bank, an electric heating coil, a chilled water cooling coil baok, and sunply and rerum/ exhaust air fans.
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Supply and Return / Exhaust Air Fars 4
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The supply and retum/ exhaust air fans are centiifugal type, single width single intet (SWSI) or double width double inlet (DWDI), with high efficiency wheels and backward inclined I
blades to produce non-overleading horsepawer characteristic *. The fens are c'esigned and rated in accordance with ANSI /AMCA 210 (Referenc: 4), ANSI /AMCA 211 (Reference 5) t and ANSI'AMCA 300 (Reference 6) applemental Air Filtration Units Each suppleraental air filtration unit includes a high efficiency filter bank, an electric heating coil, a charcoal adsorber with upstream HEPA filter bank, a downstream postfilter bank and a fan. The filtration unit configurations, including housing, intemal components, ductwork, dampers, fans and con d he location of the fans on the filtered side of uuts are gyg,
design cnns o
e performance requirements of ASME N509(Reference 2)
A25/0 to satisf the guideline f Regulatory Guide 1.140.
Low Efficiency Filters, HJgh Efficiency Filters, and Postfilters The low efficiency filters and high efficiency filters have a rated dust spot efficiency based on ASHRAE S2 (Ra.ference 7). Filter minimum average dust spot efficiency is shown in Table 9.4.1 1 and 9.4.1-2. High efficiency filter performance upstream of HEPA filter banks meet the design requircinents of ASME N509 (Reference 2), Section 5.3.
Postfilters downstream of the. charcoal filters have a minimum DOP efficiency of 95 percent. The filters meet UL 900 (Refeience 8) Class I constmction criteria.
A Revision: 11 3 Westiligh0USS 9.4-7 February 28,1997 d
HEPt. Filters HEPA filters are consttu:ted, qualified, and te9ed in acroidance with UL-586 (Reference 9) and ASME N509 (Reference 2), Section 5.1. Each HEPA filter cell is individually shop tested to serify an efficiency of at least 99.97 percent using a monodisperse 0.3-pm aerosol.
1 Charcoai Adsorbers
/a arcoal adsorber $d c h It s reai s-m u
nd tested ir. accordance with ASME N509 (Reference 2). Section 5.
Each charcoal adsorber is a single assernbly I
with welded construction and 4 inch deep y III rechargeable adsorber cell, confccming I
with IE Bulletin 80-03 (Reference 29).
gup?SMsS/OS'ME' Electric lfcating Coils ne electric heating coils are multi-stage On tubular type. He electric heating coils meet the requirements of UL-1096 (Reference 10). The coils for the supplemental air filtration subsystem are constructed, quali0ed, and tested in accordance with ASME N509 (Reference 2), Section 5.5.
Electric Unit IIcaters ne electric unit heaters are single-stage or two-stage On tubular type. The electric unit heaters are UL-listed and meet the requirements of UL 1025 (Referrnce 26) and the Na'.icnal Electrical Code NFPA 70 (Reference 28).
Cooling Coils De chilled water cooling coils are counterdow, finned tubular type. He cooling coils are j
designed and rated in accordance with ASHRAE 33 (Reference 11) and ANSI /ARI 410 (Reference 12).
liumidifiers The humidifiers are packaged electric steam generator type which converts water to steam and i
distributes it through the air handling system. The humidifiers are designed and rated in accordance with ARI 620 (Reference 13).
Isolation Dampers Nonsafety related isolation dampers are bubble tight, single or parallel blaie type. De isolation dampers have spring return actuators which fail closed on loss of electrical power.
The isolation dampers are constructed, quali0ed, and tested in accordance with ANSI /AMCA 500 (Reference 14) or ASME N509 (Reference 2), Section 5.9.
Revision: 11 February 28,1997 9.4-8 y Westhghouse e
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,e He main control room envelope isolation dampers are seismically isnaly7ed. ANSI B31.1 butterfly valves that meet the performance and design requirements of ASME N509 for Construction Class A Leakage Class I bubble tight dampers. Rese dampers have safety-related operators that fail closed on loss of electrical power.
1 Tornado Protection Dampers The tomado protection dampers are split-wing type and designed to close automatically. He tomado protection dampers are designed against the effect of 300 mph wind.
I Shutoff and Balancing Dampers Q,
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l Multiblade, two-positionEeetro-hydraulicajjpoperated shutoff dampers are parallel-blade type.
Multiblade, balancing dampers are opposedblade type. Air handling unit and fan shutoff
. dampers are designed for maximum fan static pressure at shutoff Gow and meet the performance requirements in accordance with ANSI /AMCA 500 (Reference 14). The 2
supplemental air filtration subsystem dampers are constructed, qualified, and tested in I
accordance with ANSI /AMCA 500 or ASME N509 (Reference 2), Section 5.9.
l Combination Fire / Smoke Dampers Combination fire / smoke dampers are provided at duct penetrations through fire barriers to i
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mrdntain the lire tesistance ratings of the barriers. He cornbination fire / smoke dampers meet the design, leakage testing, and installation re iuirements of UL-555S (Refereace 25).
Duttwork and Accessories 1
Ductwork, duct supports, and accessories are constructed of galvanized steel. Ductwork j
subject to fan shutcff pressures is structurally designed to accommodate fan shutcff pressures.
Ductwork, suppons, and accessories meet the design and construction requirementt of SMACNA High Pressure Duct Construction Standards (Reference 16) and SMACNA HVAC 1
Duct Construction Standards - Metal and Flexible (Reference 17). He supplemental air I
filtration and main control room / technical support center HVAC subsystem's ductwork, 1
including the portion of the ductwork outside of the main control room envelope, that maintains integrity of the main control room / technical support center pressure boundary during conditions of abnormal aisborne radioactivity are designed in accordance with ASME N509 (Reference 2), Section 5.10 to proside low leakage components necessa y to maintain main coritol roomiechnic.'l suppon center habitability.
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Revision: 11 W Wwilnghouse 9.49 February 28,1997 e
- 9. Auxinary Systems 9.4.1.2.3 System Operation 9.4.1.2.3.1 ?, fain Control Room /rechnical Support Centet IIVAC Subsystem Normal Plant Operation During nonnal plant operation, one of the two 100 percent capacity supply air handling units and retum/ exhaust air fans operates continuously. Outside makeup air supply to the supply air handling units is provided through an outside air intake duct. The cutside airflow rate is automatically controlled to maintain the main control room and technical support center areas at a slightly positive pressure with respect to the suirounding areas and the outs;de environment.
The main control room / technical support center supply air handling units are sized to provide cooling air for personnel comfort, equipment cooling, and to maintain the main control room emergency habitability passive heat sink below its initial ambient air design temperature, ne temperature of the air supplied by each air handling unit is controlled by temperature sensors located in the main control room return air duct to maintain the ambient air design temperature within its normal design temperature range by modulating the electric heat or chilled water cooling.
The outside air is continuously monitored by smoke monitors located at the outside air intake plenum and the return air is moritored for sinoke upstream of the supply air handling units.
The supply air to the main control room is continuously monitored for airbome radioactivity while the supplemental air filtration units remain in a standby operating mode.
ne standby supply air handling unit and corresponding retum/ exhaust fans are started automatically if one of the following conditions shuts down the operating unit:
Airflow rate of the operating fan is above or below predetermined setpoints.
Return air temperature is above or below predetermined setpoints.
Differential pressure between the main control room and the surrounding areas and outside environment is above or below predetermine
""'y-Abno4rmal P ant Operation zu -ummn y
I Control actions are taken at two levels of radioactivity as detected in the main control room I
supply air duct. De first is "high" radioactivity based upon gaseous radioactivity I
instrument.nion. The second is "high high" radioa:tisity based upon e;ther paticulate or I
iodme radioactivity instruments.
I If "high" gaseous radioactivity is detected in the main control room supply air duct and the main control room / technical support center HVAC subsystem is operable, both supplemental air filtration units automatically start to pressurize the main control room and techmcal support Revision: 11 February 28,1997 9.4 10 3 Westinghouse e
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center areas to at least 1/8 inch wg using filtered makeup air. After the room is pressurized.
l one of the supplemental air filuation units is manually shut down. The r.usmal outside air makeup duct and the main control room and technical support center toilet exhaust duct isolation dampers close. The main control room / technical suppon center supply air handling unit provides caoling with recirculation air to maintain the main control room passive heat sink below its initial ambient air design temperature and maintains the mair. control room and i
technical support center areas within their design temperatures. The supplemental air Gltration subsystem pressurizes the combined solume of the main control room and technical support center concurrently with fihered outside air. A ponion of the recirculation air from the main control room and technical support center is also Gltered for cleanup of airbome radioactivity.
The main control room / technical support center liVAC equi' ment and ductwork that form an i
N extension of the main control room / technical support center pressure boundary limit the overall in6ltration (negative operating pressure) and exfiltration (positive operating pressure) s rates to those values shown in Table 9.4.1-1. Based on these values, the systum is designed to maintain operator doses within allowable General Design Criteria (GDC) 19 Jimits.
l
. lf ac power is unavailable for more than a shon penod or if "high-high" paniculate or iodine
' radioactivity is detected in the main control room supply air duct, which wculd lead to i
exceeding GDC 19 operator dose limits, the plant safety and monitoring system automatically
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, isolates the main control room from the normal main control room / technical support center i
lHVAC subsystem by closing the supply, retum, and toilet exhaust duct isolation dampers.
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- Main control room habitability is maintained by the main control room emergency habitability V
J system which is discussed in Section 6.4.
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jlf a high concentration of smoke is detected in the outside air intake, an alvm is initiated in the raain control room and the main control roonVtechnical tuppon center HVAC subsystem fis manually realigned to the recirculation mode by closing the outside air and toilet exhaust duct isolation dampers. The main control room and technical suppon center toilet exhaust fcns are tripped upon closuie of the isolation dampers. The main control r%m/ technical suppon center areas are not pressurized when operating in the recirculation mode. The main 3
3 a
control room / technical suppon center HVAC supply air subsystem contim:es to provide
' 'N :ooling, ventilation, and temperature control to maintain the emergency habitability passive h.
, eat sink below its initial ambient air design temperature and maintains the main control room y
g,3 (nd technical support center areas within their design temperatureg s
- h. k k n the event of a fire in the main control room or technical support center,in response to h 3g1 from the fire or upon receipt of a smoke signal from an area smoke detector, the comHnation
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M fire / smoke dampers close automatically to isolate the fire area. 'Re subsystem con'wes to Ox '
s 3 ovide ventilation / cooling to the unaffected rea and maintains the ur.affected areas at a t!ightly positive pressure. The main control room / technical suppon center HV/sC iubsystem
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- an be manually realigned to the once-through ventilation mode to supply 100 percent outside air to the unaffected area. Realignment to the once through ventilation mode minimizes the M
potential for migration of smoke or hot gas from the fire area to the unaffected area. Smoke Q'
knd hot gases can be removed from the affected area by reopening the closed combination Ire / smoke damper (s) during the once through ventilation mode. In tie once-through ventilation mode, the outside air intake damper to the air handling unit mixing plenum opens k
Revision: 11 3 h tingh0054 9.41I February 23,1997 O
and the return air damper to the air handling unit closes to provide 100 percent outside air to the supply air handling unit, in this mode, the subsystem exhaust air isolation damper opens to exhaust the return air directly to the turbine building ant, i
Power is supplied to the main control room / technical support center HVAC subsystem by the plant ac electrical system. In the event of a loss of the plant ac electrical system, the main control room / echnical r,uppon center ventilation subsystem is automatically transferred to the t
4 onsite standby diesel generators.
9.4.1.2.3.2 Class 1E Electrical Room IIVAC Subsystem ne Class IE electrical room HVAC equipment that serves electrical division A and C equipment is desenbed in this section. He operation of the Class IE electrical room HVAC equipment that serves electrical division B and D is similar.
Normal Plant Operation During normal plant operation, one of the redundant supply air handling units, return fans, and battery room exhaust fans operate continuously to provide room temperature control, to maintain the Class IE electrical room emergency passive heat sink below its initial ambient air temperature, and to purge and prevent build-up of hydrogen gas concentration in the Clast IE Battery Rooms. 'lle temperature of the air supplied by each air handling unit is controlled i
by temperature sensors located in the retuin air duct to maintain the room air temperature within the normal design range by modulating electric heating or chilled water coeling.
l During nonnal plant operation, the exhaust airflow from the Class IE battery rooms is vented directly to the turbine building vent to limit the concentration of hydrogen gas in the rooms to less than 2 percent by volume in accordance with the guidelines of Regulatory Guide 1.128.
The outside makeup air to the supply air handling units is provided through an outside air intake duct. The outside airflow rate is manually balanced during system startup to provide adequate makeup air for the battery room exhaust fans.
ne standby supply air handling unit and the conesponding return / exhaust fans are started automatically if one of the following conditions occurs:
Airflow rate of the operating fan is above or below predetermined set points c.9 e4.*f flede?/' Oda m1Wu-red %yearYku
- #y Retum air temperatuce is above or below predetermined setpoints C
Abnormc: Plant Operr.tlon ne operation of the Clast IE electrical room HVAC subsystem is not affected by the detection of airbome radioactivity in the main control room supply air duct of the main control room / technical support center HVAC subsystem. During a design basis accident Redslon: 11 06bruary 28,1997 9.4 12 3 Westktghouse e
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- 9. Auxillary Systems
(
(DB A), if the plant ac electrical system is unavailable, the Class lE electrical room passive heat sink provides area temperature control. Refer to Section 6.4 for further details.
If a high concentration of smoke is detected in the outside air intake and an alarm is initiated in the main control room, the Class lE electrical HVAC subsystem (s) can be manually aligned to the recirculation mode by closing the outside air intake damper to the air bandling unit mixing plenom. His allows 100 percent room air to return to the supply air subsystem air 3
handhng unit. The subsystem continues to proside cooling, sentilation, and temperature control to maintain the areas served by the subsystem (s) within their design temperatures.
In the event of a fire in a Class IE electrical room, in response to heat from the Sre or upon receipt of a smoke signal from an area smoke detector, the combination fire / smoke dampers close automatically to isolate the fire area. The affected subsystem continues to provide ventilation / cooling to the remaining areas and maintains the remaining areas at a slightly positise pressure. Either or both subsystems can be manually realigned to the once-through ventilation mode to supply 100 percent outside air to the unaffected areas. Realignment to the once through ventilation mode minimizes the potential for migration of smoke and hot gases from a non-Clas; IE electrical room or a Class lE electrical room of one division into I
the Class IE electrical room of another division. Smoke and hot gases can be removed from the affected areas by reopening the closed combination fire / smoke dampers during the once-through ventilation mode. In the once-through ventilation mode, the outside air intake damper to the air handling unit mixing plenum opens and the return air damper to the air handling unit closes to allow 100 percent outside air to the supply air handling unit. He subsystem exhaust air isolation damper also opens to exhaust room air directly to the turbine building 1
vent.
The power supplies to the Class IE electrical room HVAC subsystem are provided by the i
plant ac electrical system and the onsite standby diesel generaton. In the event of a loss of the plant ac electrical system, the Class IE electrical room HVAC subsyste n is automatically transferred to the onsite standby diesel generators.
9.4.1.2.3.3 Passive Containment Cooling System Valve Room IIcating and Ventilation Subsystem
~
Normal Plant Operation The passive containment cooling system valve room ventilation fan exhausts room air to the outside environment to maintain room temperature within its normal design temperature range.
When heating is required, one of the two redaridant elecuic unit heaters proGd:s heatirig to l
mtintain the passive containment cooling system vahe room temperature abose its minimum design temperature. Th: lead electric unit heater starts or stcps n hen the room air temperature is above or below predetermined setpoints.
The standby electric unit heater starts automatically if the room air temperature drops below a predetermined setpoint.
4 me.
Revision: 11
(# Westhighouse 9.4-13 February 28,1997 h
- 9. AuxiHary Systems o,
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Abnormal Plant Operation ne power supplies to the passive containment cooling system valve room unit heaters are provided by the plant ac electrical system and the onsite standby diesel generators. In the event of a loss of the plant ac electrical system, the passive containment cooling system valve room unit heaters can be transferred to the onsite standby diesel generators by the operator.
The power supply to the passise containment cooling system valve room ventilation fan is provided by the plant ac electrical system. He room temperature is not expected to exceed 120*F, based on maximum ambient conditions and intemal beat sources.
Following a Gre in the passive containment cooling system valve room, smoke and hot gases can be removed fro.n the area using pcrtable exhaust fans and flexible ductwork.
9.4.1.3 Safety Evaluation The nuclear island nonradioactive ventilation system has no safety related function other than main control room envelope isolation and main, control room supply air radioactivity t
monitoring, and therefore requires no nuclear safety evaluation. Redundant safety related isolation dampers are provided in the supply, return, and exhaust ducts penetrating the main control room. Therefore, there are n single active failures which would prevent isolation of j
the main control room envelope Kedundant main control room supply air radiation monitors are piovided. Re nuclear isla nonradicactive ventilation system is designed so that safety.
related systems, structures, components arc not damaged as a result of a seismic event.
9.4.1.4 Tests and Inspections
~
ne nuclear island nonradioactive ventilation system is designed to permit periodic inspection of system components. Each component is inspected prior to installation. Components of each system are accessible for periodic inspection during normal plant operation. A system air balance test and adjustment to design conditions is conducted in the course of the plant i
preoperational test program. Airflow rates are measured and balanced within a tolerance of i
10 percent of design now rate in accordance with the guidelines of SMACNA HVAC systems, Testing, Adjusting and Balancing (Reference 19) except the supplemental air filtration units which are balanced in accordance with the guidelines of ASME N510 (Reference 3). Instruments are calibrated during testing. Automatic controls are tested for actuation at the proper setpoints. Alarm functions are checked for operability.
The supplemental air filtration unit. HEPA filters, and charcoal adserkrs are field tested in accordance with ASME N510 to verify that these components do not exceed a maximum allow able bypass leakage sate. Used sainples of charcoal.dsorbent are periodically tested to verify a mirdmum charcoal efficiency of 90 percent in accordance with Regulatory Guide 1.140, except that test procedures and test frequency are conducted in accordance with ASME N510.
Revision: 11 3
February 28,1997 9.4-14 3 Westfrigt10Use
- 9. Auxiliary Systems Non. safety electrical penetration rooms (auxiliary building)............ 50-105 Reactor trip SWGR rooms (auxiliary building)
... 50 105 Valve / piping penetration room (auxiliary building)
. 50-105 l
Ancillary diesel generator room (annex building)...
50-105 Atwatu2AfbAMhA'QMQaho +1;?t >
g.w G c
Upset Conditions (less of Plant ac Electrical System)
Switchgear rooms (annex building) 122 (maximum)
Battery charger rooms (annex building) 122 (maximum)
I Ancillary diesel generator room (annex building - DG sets operating) 122 (maximum) 9.4.2.2
System Description
The annex / auxiliary buildings nonradioactive HVAC system consists of the following independent subsystems:
General area HVAC subsystem Switchgear room HVAC subsystem Equipment room HVAC subsystem MSIV compartment HVAC subsystem a
Mechanical equipment areas HVAC subsystem Valve / Piping penetration room HVAC subsystem Tne defense in depth portion of Ge system is shown in Figure 9. 21.
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,grasz<ime.l' MW'kWg 9.4.2.2.1 General Description d44n < 4 +1dM
-~%:5r*rft# M.4 ' A MM kW r%*-c* -!!2 ', a-t24' setAA QN t
9.4.2.2.1.1 General Are's HV C Subsystem
/W ne general ar HVAC subsystem serves personnel areas in the annex building outside the security area.
e general area HVAC subsystem consists of two 50 percent capacity supply I
air handling units of about 5,100 scfm each, a humidifier, a ducted supply and retum air system, diffusers and registers, exhaust fan, automatic controls, and accessories. De air handling units are located on the low roof of the annex building at elevation 117'-6". The units discharge into a ducted supply distribution system which is routed through the building to provide air into the various rooms and areas served via registers. An electric heating coil is provided in the branch supply duct to the men's and women's change rooms for tempering the supply air.
A humidifier is provided in the system to provide a minimum space relathe humidity of
^5 percent.
Air froin the men's and women's locker, toilet, and shower facilities in the annex building is exhausted directly to atmosphere by an exhaust fan. Room air from the remaining areas served is recirculated back to the air hardling unit via a ceiling retum plenum and a return Revision: 11 W WesQghouse 9.4-17 February 28,1997 e.e e
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- 9. Aux 11Lary Systems duct system. Outsida make-up air is added to the retum air stream at the air handling units to replace air exhausted from toilets and shov.ers in the area scr"ed.
s 9.4.2.2.1.2 Switchgear Room IIVAC Subsystem ia&L i
De switchgear room HVAC subsystem serves electrical switchgear poms4 n the annex i
building. De switchgear room HVAC system consists of two 100 percent capacity air handling units, a ducted supply and return air system, and automatic controls and accessories.
The air handling units are located in the north air handling equipment room in the arnex j
building at elevation 135'-3
The air handling units discharge into a common duct distribution system that is routed through the building to the rooms served. Air is retu ned to the air handling units from the room ed by a return du f
g hg If 9.4.2.2.1.3 Equipment Room I Subsyst llVACsu&g w p p t.t and' Redfared iNynurig.x2,9qf;'
m/J De equipment to Bsystem serves electrical and mechanical equipment rooms in
,,q,
the annex and auxiliary buildingM This subsystem also serves the security area offices and the central alarm station in the annex buildingjne equipment room HVAC system consists of two 100 percent capyacita' handling units, two battery room exhaust fans, a toilet exhaust fan, a ducted supaktnd rerum air system, and automatic controls and accessories.
CQ M L b as4w wM tLusw a-md gg ne air handling units are located in the north air handling equipment room in the annex building at elevation 135'-3".
The air handling units discharge into a common duct distnbu' ion system that is routed through the I;uildings to the various areas sened. Air it retumed to the air handling units from the rooms served (except the battery rooms and rest rooms) by a retum duct system. Electric reheat coils are provided in the ductwork to areas requiring close temperature control such as the security area offices and the central alarm station. Hot water unit heaters are provided in the north air handling equipment room to maintain the area above 50*F.
A humidifier is provided in the branch duct to the security areas to provide a minimum space relative humidity of 35 percent.
Each non-Class IE battery room is provided with an individual exhaust system to prevent the buildup of hydrogen gas in the room. Each exhaust system consists of an exhaust fan, an exhaust air duct and gravity back draft damper located in the fan discharge. Air supplied to the battery rooms by the air handling units is exhausted to atmosphere. Air from the rest rooms is exhausted to atmosphere by a separate exhaust fan.
9.4.2.2.1.4 MSIV Compartment IIVAC Subsystem De main steam isolation valve compartment HVAC subsystem serves the two main steam isolation valve compartments in the auxiliary building that contain the main steam and feedwater lines routed between the containment and the turtaine building. Each compartment is provided with separate heating and cooling equipment.
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n-De main stum isolation valve er mpanment HV AC subsystem consists of two l'X) prcent I
F capacity supply air handling units or about 3,300 scfm each with only low efficiency filters, ducted supply air distribution o
Is, and cessories for each main steam isolation valve com artment.
4 -
- yd44. 64.4A:"M Dehh 4 u its are located directly within the space served. One unit in each companment nomia ly operates to maintain the temperature of the compartment, n e air handling units can be connected to the standby power system, for investment protection, in the event of loss of the plant ac electrical system.
9.4.2.2.1.5 Mechanical Equipment Areas HVAC Sub<ystem i
The mechanical equipment areas HVAC subsystem serves the ancill diesel generator room, demineralized water deoxygenating room, boric a:id batchinia, room,
air handling equipment room in the m,d of @ annex building.
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stem conhf two 50 percent capacitk~ [serrJm ne mechanical equipment areas HVAC subsy.
n l
handling units with supply fans and return / exhaust fans of about 2,200 scfm each, a ducted supply and retum air system, automatic controls, and accessories.
De air handling units are located in the lower scuth air handling unit equipment room on elevation 135'-3" of the annex building.
l The ancillary diesel generator room is supplied air frcm the air handling units to mainuin I
normal design temperatures. Air supplied to the room is ey.hausted direct to oetdoors by I
means of a separate exhaust fan. Ventilation and cooling for the room when the. ancillary I
diesel generators operate is provided by means of manually operated dampers and openin l
doors to allow radiator discharge air to be exhausted direct to outdoors.
9.4.2.2.1.6 Valve / Piping Penetration Room HVAC System The valve / piping penetration room HVAC subsystem serves the valve / piping penetration room on elevation 100'-0" of the auxiliary building. De valve / piping penetration room HVAC 4
l subsystem consists of two 100 percent capacity air handling units with supply fans ofp,800 i
sefm each, a return air duct system, automatic controls and accessories.
gM The air handling units are located directly within the space served.
9A.72.2 Component Description nc annex / auxiliary buildings HVAC system is comprised of the following major :ompnents.
Dese components are located in buildings on the Seismic Category I Nuclear Istmd or in the annex building. The seismic design classification, safety classification and principal construction code for Class A, B, C, or D components are listed in Section 3.2.
Tables 9.4.21 and 9.4.2 2 provide the design parameters for major defense-in-depth components of the system.
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- 7. Auxillary Systems Electric Heating Coils ne electric heating coils are multi stage fin tubular type. He electric heating coils meet the requirements of UL 1096 (Reference 10).
Electric Unit IIeaters The electric unit heaters are single-stage or two-stage fin tubular type. De electric unit heaters are UL-listed and meet the requirements of UL 1025 (Reference 26) and the National El: uric Cede NFPA 70 (Referen:e 28).
Shutoff, Control, Balancing, and Backdraft Dampers
.remdely i
Multiblade, two-position &%dUr m3i~goperated shutofTdampers are parallel blade type. Multiblade, control and balancing damperrare opposed blade type. Backdraft dampers are provided to prevent backflow through shut down fans. Air handling unit and fan shutoff dampers are designed for maximum fan static pressure at shutoff flow. Dampers meet the performance requirements of ANSI /AMCA 500 (Reference 14).
Fire Dampers Fire dampers are provided at duct pen'etrations through fire barriers to maintain the fire resistance ratings of the barriers. The fire dampers meet the design and installation requiremerits of UL 555 (Reference,15).
Ductwork and Accessories Ductwork, duct supports and accessories are constructed of galvanized steel. Ductwork
>ubject to fan shutoff pressure is structurally designed for fan shutoff pressures. Ductwork, supports and accessories meet the design and construction requirements of SMACNA High Pressure Duct Constmetion Standards (Reference 16) and SMACNA HVAC Duct Construction Standards Metal and Flexible (Reference 17).
9.4.2.2.3 System Operation l
9.4.2.2.3.1 General Area HVAC Subsystem l
Normal Phat Optration During normal plant operation, both supply air handling units and the toilet /shomt exhaust fan operate coatinuously to maintain suitable temperatures in the areas served.
The temperature of the air supplied by each handling units is controlled by individual temperature controls with their sensors located in the annex building main entrance. He temperature sensor sends a signal to a temperature controller which modulates the chilled water control valve and the face and bypass dampers across the supply air heating coil to maintain the area
(
r Revision: 11 W Westingt100$6 9.4-21 February 28,1997
9
- 9. Auxiliary Systems
.I Abnormal Plant Operation De main steam isolation valve compartment HVAC subsystem is not required to operate during abnormal plant conditions.
9.4.2.2.3.5 Mechanical Equipment Areas IIVAC Subsystem Daring normal plant operation, the air handling units operate centinuou'ly to maintain the indoor temperatures in the areas served. The tenperature of the air supplied by each air handlir.g unit is controlled by individual temperature controls with their sense > located in the upper south air handling equipment room. The temperature sensor sends a signal to a temperature controller which modulates the face and bypass dampers across ebe supply air heating coil and the chilled water control valve to maintain the mechanical equipment areas within the design temperature range. The switchover between cooling and heatmg modes is automatically controlled by the area emperature controller.
Differential pressure drop across eacf air handling unit filter bank is monitored. and individua alarms are actuated when pressure prop rises to a predetermined level indicative of the need for filter replacement. During f1ter replacement, the system operates at approximately 50 percent capacity, i
l The exhaust fan for the anci ary diesel generator roor6 operates continuously for room I
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Abnormal Plant Operation 5 b' Ed /8
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He mechanical equipment at HV C subsystem is not req 3 red to opera i
duriri plant conditions.
//W4 - ff -(-4 f2/t./g abnormal-WHMt..M I
When the ancillary diesel generator sets are operated, a manual damper is opened as rem # ' '
]
I and the outside door is opened to maintain acceptable temperatures.
9.4.2.2.3.6 Valve / Piping Penetration Room HVAC Subsystem Normal Plant Operation During normal plant operation, one air hand!ing unit operates continuously in a recirculation mode to maintain the indoor temperature m the room. A temperature controller modulates the chilled water control vahe and cpens ar.d closes the hot water cantol uae se vmg the operating unit to maintain the area temperature at or less than 105'F and above a trJnimum cf 50T. De switchoser bet,veen cooling end heating modes is autotnatical!) wr..rJed by the area temperature controller.
s ne differential pressure drop actoss each air handling unit filter bank is monitored, and individual alarms are actuated when the pressure drop rises to a predetermined level indicative of the need for filter replacement.
'\\.
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- 9. Auxill:ry Systems R[
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An alarm is provided for smoke in discharge ducts from the air handling units.
Position indicating lights are provided for automatic dampers.
9.4.3 Radiologically Controlled Area Ventilation System The radiologically controlled area ventilation system (VAS) serves the fuel handling area of the auxiliary building, and the radiologically controlled portions of the auxiliary and annex buildings. except for the health physics and hot macbine shop areas which are provided with a separate sentile. tion system (VHS).
9.4.3.1 Design Basis i
9.4.3.1.1 Safety Design Basis The radiologically controlled area ventilation system serves no safety.related function and I
therefore has no nuclear safety design basis.
9.4.3.1.2 Power Generation Design Basis The radiologically con'.roibd area ventilation system provides the following functions:
Provides ventilation to maintain the equipment rooms within their design remperature range Provides ventilation to maintain airbome radioactivity in the access areas at safe levels for plant personnel Maintains the overall airflow direction within the areas it serves from areas of lower potential airbome contamination to areas of higher potential contamination Maintains each building area at a slightly negative pressure to prevent the uncontrolled release of airbome radioactivity to the atmosphere or adjacent clean plant areas Automatically isolates selected building areas from the outside environment by closing the supply and exhaust duct isolation dampers and starting the containment air filvation system when high airbome radioactivity in the exhaust air duct or high ambient pessure differential is detected. See subsection 9.4.7 for a description of the containment air filtration system.
The system maintains the following room temperatures based on the maximum and minimum norrnal outside air temperature conditions shown in Chapter 2, Table 21:
Access and Equipment Areas Temperature g _,.
('F)
,sp.4 Corridors and staging areas.................................. 50 - 104 k
Revision: 11 3 WB5tirigl10US0 9.4 27 February 28,1997
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- 9. Auxiliary Systems YW
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j p#
HVAC equipment room................................... 30 104
/
/ /V Spent fuel pool pump and heat exchanger rooms 50 ih4
~
' [ yf7 f>r/
" Rail car ba / tet.storagtarea.
~
.......... 50 - 1(H scous radwaste equipment rooms
. 50 - 104' p
Temperature
(*F)
/bgasifier column.
. 50 - 130 \\
RNS and CVS pump rooms (pumps not operating) 50 - 104 l RNS and CVS pump rooms (pumps operating).
50 - 130
{
g Containment purge exhaust Elter rooms (fans not opuathg).
. 50 - 104 Containment purge exhaust filter rooms (fans operating)
.50 - 130 1.iquid radwaste tank rooms
.. 50 - 130 Liquid radwaste pump rooms
. 50 - 104 Spent resin equipment rooms..
. 50 130 kg Radioactive pipe chases and valve rooms
. 50 - 130 ]
M Oc A
~
b uel handling area 50 96
- [
Radiation chemistry laboratory 73 - 78
!,/ p
- y Primary sample room 73 - 78 g,
Security rooms...........
73-78 9.4.3.2
System Description
The radiologically controlled area ventilation system consists of the following subsystems:
Auxiliary / annex building ventilation subsystem Fuel handling area ventilation subsystem Radiation chemistry laboratory ventilation subsystem ne defense in depth portion of the system is shown in Figure 9.4.3-1.
[&b A - 9,4.3 -/ M u:e M [e ' Y 9.4.3.2.1 General Description 1s. 8<8 mm 9.4.3.2.1.1 Auxillary / Annex Bull ing en He auxiliary / annex buil g ventilation subsystem serves radiologically contro led equipment, piping and valve rooms, cent access and staging areas, and the radiation chemistry laboratory ventilation subsystem. The auxiliary / annex building ventilation subsystem consists I
of two 50 percent capacity supply air handling uriits of about 21,000 scfm each, a ducted supply and exhaust air system, isolation dampers, diffusers and registers, exhaust fans, automatic controls and accessories. De supply air handling units are located in the south air handling equipment room of the annex building at elevation 158'-0". He units discharge into a ducted supply distribution system which is routed through the radiologically controlled areas of the auxiliary and annex buildings. De supply and exhaust ducts have isolation dampers Revision: 11 February 28,1997 9.4-28 3 Westinghouse
- 9. Au illary Sgtems i
the auxiliary building is isolated, preventing the exfiltration of unmonitored re! cases from the middle annulus to the environment.
o~
9.4.3.2.1.2 FuelI{andim, g Area Ventilation Subsystern/l$4Li Ak' N
A
, pg.,
ne fuel hand ; g area ventilat/p.osd-zWstaLQ SS Uttde/
MM on subsystem senes the fuel handling area, rail car bay /Gite
/
storage are). -
&JW mm y"jnm-dWing amt. De fuel handling area ventilation subsysicm consists of two 50 percent capacity supply air handing units of a i
i 9,500 scfm each. a ducted supply and exhaust air system, isolation darnpers, diffusers, registers, exhaust fans, automatic controls and accessories. The ventila'icn airflow capacity is designed to maintain environmental conditions that support worker efGciency during fuel handling operations based on a maximum wetbulb globe temperature of 80*F (96'F drybulb) as defined by EPRI NP-4453 (Reference 22). He supply air handling units are located in the south air handling equipment room of the annex building at elevation 135'-3" De units discharge into a ducted supply distribution system which is routed to the fuel handling and rail car bay /Glier storage areas of the auxiliary building. The supply and exhaust ducts are provided with isolation dampers that close when high airborne radioactivity in the exhaust air or high pressure differential with respect to the outside atmosphere is detected.
He exhaust air fans are located in the upper radiologically controlled area ventilation system equipment room at elevation 145'-9" of the auxiliary building. ne supply and exhaust ductwork is arranged to exhaust the spent fuel pool plume and to provide directional airHow from the rail car bay /Giter storage area into the spent resin equipment roo!ns. The exhaust fans discharge the radiological relca ebexhaust air into the plant vcnt for monitoring of offsite airb amc,6p d-lN/wd,h e'
The ventilation airflow dilutes potential airbome contamination to maintain the concentration at the site boundary within 10 CFR 20 (Reference 21) allowable effluent concentration limits and the internal room airbome concentrations within 10 CFR 20 occupational derived air concentration (DAC) limits during normal plant opeistion.
9.4.3.2.1.3 Radiation Chemistry Laboratory Ventilation Subsystem De radiation chemistry laboratory ventilation subsystem serves the radiation chemistry laboratory, primary sample room and auxiliary building security rooms. 'De radiation chemistry laboratory ventilation subsystem consists of two 100 percent capacity supply air I
handing units of about 4,300 scfm each, a ducted supply air system, a humidifier, diffusers, registers, automatic controls and accessories. The supply air handling units are located in the south air handling equipment room of the annex building at elevation 158'-0". The supply air handling units are connected to the auxiliary / annex building ventilation subsystem supply air duct to utilize preconditioned and prc51tered outdoor air. Supplemental Gitration is provided by the radiation chemistry laboratory ventilation subsystem for added cleanliness to support operation of sensitive equipment. A humidifier is located in the common supply air ductwork downstream of the supply air handling units. De radiation chemistry laboratory exhaust air is ducted to the auxiliary / annex building ventilation subsystem exhaust fans. He Revision: 11 Febreary 28,1997 9.4-30 3 W65tingholfsa J
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- 9. Auxillary Systems c
Heating Colls He heating coils are hot water, finned tubular type. He outside supply air heating coil provided with integral face and bypass dampers to prevent freeze damage whe the heat output.
Coils are performance rated in accordance with ANS!/ARI 410 (Reference 12).
J Cooling Coils ne chilled water cooling coils are enunterf'ow, finned tubular type. The coc!ing ecib are designed and rated in accordance with ASHRAE 33 (Reference 11) and ANSUARI 410 (Reference 12).
Ilumidifier ne humidifier is a packaged electric steam generator type which converts water to steam and distributes it through the supply duct system. De humidifier is performance rated in accordance with ARI 620 (Reference 13).
Fire Dampers Fire dampers are provided at duct penetrations through fire barriers to maintain the fire resistance' rating of the barriers. He fire dampers meet the design, testing and installation i
requirements of UT.-555 (Reference 15).
Shutoff and Balancing Dampers
/
/
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l Multiblade, two-po operated shutoff dampers are parallel blade type.
Multiblade, balancing dampers are op[used blade type. Air handling unit and fan shutoff dampers are designed for maximum fan static pressure at shutoff flow and meet the performance requirements of ANSUAMCA 500(Reference 14).
Isolation Dampers Isolation dampers are bubole tight, single or parallel-blade type. He isolation dampers have spring retum actuators which fail closed on loss of electrical power or loss of air pressure.
4 ne isolation dampers are constmeted, qualified and tested in accordance with ANSI /AMCA 500 (Reference 14).
Ductvork and Accessories Ductwork, duct supports and accessories are constructed of galvanized steel. Ductwork subject to fan shutoff pressure is structurally designed for fan shutoff pressures. Ductwork, supports and accessories meet the design and construction requirements of SMACNA High Pressure Duct Construction Standards (Reference 16) and SMACNA HVAC Duct Constmetion Standard - Metal and Flexible (Reference 17).
4 Revision: 11 February 28,1997 9.4-32 y Westl@ouse e
- 9. Auxiliary Systems
'l Directs the exhaust airi the containment atmosphere to the plant vent for monitoring, and provides fihration tc wit the relcase of airborne radioactivity at the site boundary within acceptable level.-
Monitors gaseous, particulate and iodine concentration levels discharged to the environment through the plant vent ne system conditions and filters outside air supplied to the containment for compatibility with personnel access during maintenance and refueling operations. Based on the maximum and minimum ou: side air nonnal temperature conditions shown in Chapter 2. Table 2-1 the system supplies air between 50 and 70'F. De air is distributed and conditiened within the containment by the containment recirculation system (subsection 9.4.6).
Radiologically Controlled Areas Outside Containment The containment air filtration system provides filtration of exhaust air from the fuel handling area, auxiliary, or annex buildings to maintain these areas at a slightly negative pressure with respect to the adjacent areas when the radiologically controlled area ventilation system detects high airbome radioactivity oppressure differential. Refer to subsection 9.4.3 for a description of the radiologically controlbd area ventilation system.
9.4.7.2
System Description
ne containment air filtration system is shown in Figure 9.4.7-1.
9.4,7.2.1 General Description The containment air filtration system consists of two 100 percent capacity supply air handling units, a ducted supply and exhaust air syst:m with containment isolation valves and piping, registers, exhaust fans, filtration units, automatic controls and accessories. The supply air handling units are located in the south air handling equipment room of the annex building at elevation 158'-0". He supply air handling units'are connected to a common air intake I
plenum, located at the south end of the fan room. The common air intake plenuniis located I
at the extreme south end of the anriex building between elevation 135' 0" and 152'-0". This plenum supplies air for the radiologically control area ventilation system, the containment air I
filtration system, the nuclear island non-radioactive ventilation sy; tem, the annex / auxiliary I
building non-radioactive HVAC system and the health physics and hot machine shop HVAC sy; tem. De intake is not protected from tomado missiles. De containment air filtration I
system supply air hat.dlF >. nits discharge the supply air towards the east cor.tainment recirculation cooling system (VCS) ecirculation unit to distribute the purge air within the containment. Refer to subsection..4.6 for a description of the containment necirculation cooling system.
ne exhaust air filtration units are located within the radiologically controlled area of the annex building at elevation 135'-3" and 146'-3". The filtration units are connected to a ducted system with isolation dampers to provide HEPA filtration and charcoal adsorption of exhaust k.
Revision: 11
[ WC5tingh0058 9.4-43 February 28,1997
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- 9. Auxiliary Systems g,g,4.sMac MM
,w exhaust fan. The fiTifatiert. unit con 0gurations, including housi, intemal components, ductwork, dampers, fans, and hctrols, are designed errdTonstructe o meet the performance j
requirements of ASME N50P (Reference 2) to satisfy the guidelines of Regulatory l
Guide 1.140 e filtration unit housings maximum leakage rates do not exceed one percent I
of the design ow in accordance with ASME N509. Refer to Table 9.4-1 for a summary of dt air filtration system filtration ef6ciencies and Appendix 1 A for a comparison the containme of the containment air filtration system exhaust air filtration units with Regulatory Guide 1.140. (
g i
isolation Dampers isolation dampers are bubble tight, single blade or parallel-blade type. The isolation dampers have spring retum actuators which fail closed on loss of electrical power or instrument air.
De design and construction of the isolation dampers is in accordance with ANSUAMCA 500 or ASME N509 (References 14 and 2).
Pressure Differential Control Dampers Pressure differential control dampers utilize opposed-blade type construction and meet the performance requirements of ANSI /AMCA 500 (Reference 14) or ASME N509 (Reference 2),
l Section 5.9 ne dampers maintain a slight negative pressure within the fuel handling building I
area, with respect to the environment and adj:icent non radiologicr!!y controlled plant areas.
Supply and Exhaust Fans The supply and exhaust air fans are centrifugal type, single width single inlet (SWSL, A high efficiency wheels and backward inclined blades to produce non-overloading P wer characteristics. Fan performance is rated in accordance with ANSUAMCA 210 ^ o te,:e 4),
ANSUAMCA 211 (Reference 5) and ANSUAMCA 300 (Reference 6).
Containment Penetrations ne containment penetrations include containment isolation valves,interconne :tt y cir6g, and vent and test connections with manual test valves. De containment isolation compomra dat maintain the integrity of the containment pressure boundary after a LOCA are classifM as Safety Class B and seismic Category I. Seismic Category I debris screens are mounted on Safety Class C, seismic Category I pipe to present entrainment of debris throt:gh the supply and exhaust openings that may prevent tight valve shutoff. The screens are designed to w;thstand post LOCA pressures, ne containment isolatior, valves inside and outside the containment have air operators. He valves are designed to fait closed in the event of loss of electrical power or air pressure. Re valves are controlled by the protection and plant safety monitoring system as discussed in subsection 7.1.1. He valves shut tight against the containment pressure following a design basis accident.
4
\\..
Revision: 11
[ W6stiflgh00$8 9.4-45 February 28,1997
- 9. Auxulary Systems Ductwork and Accessodes Dectwoik, duct supports ar.d accessories are constmeted of galsanized steel. Ductwork subject to fan shutoff pressures is stmeturally designed to accommodate fan shutoff pressures.
He system air ductwork inside containment meets seismic Category II criteria so that it will not fall and damage any safety-related equipment following a safe shutdown earthquake.
Ductwork, suppons and accessories meet the design and constmetion requirements of SMACNA High Pressure Duct Construction Standards (Reference 16) and SMACNA HVAC Duct Construction Standard - Metal and Flexible (Reference 17). He exhaust air ductwj and supports meet the design and construction requirements of ASME N509 (Reference 2),
Section 5.10.
Shutoff and Balancing Dampers
_ remo fe h l
Multiblade, two-position nemtid Multiblade, balancing dampers are o]pposed-blade type. Air ha operated shttoff dampers are parallel blade type.
dampers are designed for maximum fan static pressure at shutoff flow and meet the performance requirements of. ANSI /AMCA 500 (Reference 14). The containment exhaust air dampers meet the design and construction criteria of ASME N509 (Reference 2), Section 5.9.
Fire Dampers Fire dampers are provided where the ductwork penetrates a fire barrier to maintain the fire resistance rating of the fire barders. De fire dampers meet the design and installation requirements of UL 555 (Reference 15).
Low Efficiency Filters, High Efficiency Filters, and Postfilters Low and high efficiency filters are rated in accordance with ASHRAE Standard 52 (Reference 7). De minimum average dust spot efficiencies of the filters are shown in Table 9.4.7-1. High efficiency filter performance upstream of IEPA filter banks meet the design requirements of ASME N509 (Reference 2), Section 5.3.
Postfilters located downstream of the charcoal adsorbers have a minimum DOP efficiency of 95 percent. He filters meet UL 900 Class I construction criteria (Reference 8).
HEPA Filters HEPA filters are constmeted, qualified, and tested in accordance with ASME N5M (Reference 2), Section 5.1. Each HEPA filter cell is individually shop tested to wrify an efficiency of at least 99.97 percent using a menodisperse 0.3-m aerosol.
Charcoal Adsorbers h
/
[p/v, Charcoal adsorbert V2hc4m = E -
nstruct, qualified and tested in accordance with ASME N509 (Reference 2), Section 5.
Each charcoal adsorber is a single assembly with welded construction and 4-inch deep IH rechargeable adsorber cell.
I 5IO Il g
eb
, L997 9.4-46 #I k
, Westifighoilse
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e
=
9, Aunlicry systems exhaust filter plenums at a negative air pressure when the containment is positively pressurized. Based on predetermined setpoints, the operators select the appropriate damper to open. nis pruents exfiltration of unfiltered 2.ir fiom bypast.ing one filters, ne filtered exhaust air from the containment is discharged to the atmosphere through the plant vent by the exhaust fan. The gaseous effluents in the plant vent are monitored for radioactivity levels before the air is discharged to the environment. Refer to Section 11.5 for a description of the plant vent radiation monitor.
During single subsystem operation, the standby supply and exhaust air units can be started manually by the operator if the operating train fails.
Prior to and during plant shutdown, one or both trains of the containment air filtration system can be operated to remove airborne radioactivity prior to personnel access. During cold t
ambient conditions, the supply air is heated by the hot water Feating system.' he exhaust filter unit electric heater controls the relative humidity of the exhaust air entering the charcoal adsorber below 70 percent.
When both trains are operated concurrently, the containment air filtration system provides a maximum airflow rate equivalent to approximately 0.25 air changes per hour. His airflow rate provides adequate ventilation for personnel inside containment during refueling operations.
At. normal Plant Operation The containment isolation valves in the supply and exhaust air lines automatically close when containment isolation signals are initiated by the protection and safety monitoring system or diverse actuation system. Refer to subsections 6.2.3,7.7.1.11 and 7.3 for discussions of the containment i>olation system, diveae actuation system and protection and safety monitoting s;' stem.
Main control room operators can cormect the containment air filtration system to the containment for cleanup of potential airbome radioactivity while the containment remains isolated if a containment high radiation signalis not present.
AUrk)
If high airborne radioactivity orgrvssure differential is detected in the fuel handling area, the auxiliary and/or annet buildings, the radiologically controlled area ventilation system isolates the affected area from the outside environment and starts the containment air filtration exhaust subsystem to maintain a slight negative pressure differential in the isolated zone (s). The airflow rate through the exhaust fan is maintained at a constant value by modulating the fan inlet vanes. An outside air makeup damper modulates to control the exhaust airflow rate through the HEPA and charcoal filters to maintain the isolated area (s) at a slightly negative pressurg The containment air filtration system is automatically isolated from the containment, if purgbg is in progress and the standby exhaust filter train does not stari. If both exhaust trains connected to the containment, one exhaust tnin is automatically isolated from the Revision: 11 February 28,1997 9.4-48 3 Westlogt10USS e
d
- 9. Auxulary Systems t
- I.?
Hot Water Urtit Heaters ne hot water unit heaters consist of a fan section and hot water heating coil section factory assembled as a complete and integral unit. The unit heaters are either horizontal discharge or vertical downblast type. De coil ratings are in accordance with ANSUARI 410 (Reference 12).
Cooling Coils The chilled water cooling coils are counterflow, Onned tubular type. The cooling ceils are designed and rated in accordance with ASHRAE 33 (Reference 11) and ANSUARI 410 (Reference 12).
IIeating Coils I
ne hot water heating coils are counterflow, Onned tubular type. The heating coils are I
provided with integral face and bypass dampers to prevent freeze damage when modulating I
the heat output. He heating coils are designed and rated in accordance with ASHRAE 33 (Reference 11) and ANSUARI 410 (Reference 12).
I Shutoff, Control, Balancing, and Backdraft Dampers V_
remode'Icj i
Multiblade, two position'th= inf3geperated shutori dampers are parallcl blade type.
l
% ltibbde, contrel and balncing dsmprs are opposed blede type. Backdiaft hmpera a e i
provided to prevent backflow through shut down fans. Air handling unit and fan shutoff dampers are designed for maximum fan static pressure at shutoff Dow. Dampers meet the performance requirements of ANSUAMCA 500 (Reference 14).
Fire Dampers Fire dampers are provided at duct penetrations through fire barriers to maintain the fire resistance ratings of the barriers. The fire dampers rueet the design and installation requirements of UL 555 (Reference 15).
Ductwork and Accessories Ductwork, duct supports and accessories are constructed of galvanized steel. Ductwork scbject to fan shutoff pressure is stmeturally designed for fan shutoff pressur:5. Ductwork, supports and accessories meet the design and ecostruction requirements of SMACNA High Pressure Duct Construction Standards (Reference 16) and SMACNA HVAC Duct Constmetion Standards Metal and Flexible (Reference 17).
.'\\.
Revision: 11 3 Wesiinghouse 9.4-53 February 28,1997 a
DCPt Gw/-GEE-4t7/oP
~
gl-l-Pay 2 9
- 9. Auxiit=rr siste==
I the low radiation access areas into the mdioactive equipment and piir.g rooms with a graate i
potential for airborne radioactivity. Additionally, the exhaust air ductwork is connected to the i
radioactive waste drain system (WRS) sump to maintain the sump atmosphere at a negat i
air pressure to prevent the exfiltration of potentially contaminated air into the surrounding i
l area. The exhaust air ductwork is connected to the radwaste effluent holdup tanks to prevent f
I the potential buildup of airbome radioactivity or hydrogen gas within these tanks.
The i
exhaust fans discharge the exhaust air into the plant vent for monitoring of offsite airbome I
radiological releases.
I ne ventilation airflow dilutes potential airborne contamination to maintain the concentration I
at the site boundary within 10 CFR 20 (Reference 21) allowable effluent concentration limits I
and the intemal room airbome concentrations within 10 CFR 20 occupational derived air i
concentration (DAC) limits during normal plant operation.
I Unit coolers are located in the normal residual heat removal system (RNS) and chemical and I
volume control system (CVS) pump rooms because they have significant cooling loads on an I
intermittent basis when 'large equipment is operating.
Each unit cooler is sized to I
accommodate 100 percent of its corresponding pump cooling load. The ?mit coolers are I
provided with chilled water from redundant trains of the central chilled water system (VWS) l low capacity subsystem. The normal residual heat removal pump room unit coolers have two i
cooling coils per unit cooler so that chilled water supplied by either train A or train B alone I
can support concurrent operation of both normal residual heat removal system pumps. The I
two chemical and volume control makeup pump room unit cocters are connected to redundant I
trains of the chilled water system: however, operation of either the train A cr train B unit
{
l cooler alone maintains the common makeup pump room temperature conditions and suppons I
operation of either makeup pump.
{
l I
Heating coils are located in the supply air ducts serving plant areas that require supplemental
{
l heating during periods of cold outside air temperature conditions:fElectric unit heaters provide I
supplemental beating in the middle annulus.
(
I I
ne upper annulus is separated from the middle annulus area of the auxiliary building by a]
i concrete floor section and flexible seals that connects the containtnent steel shell to the shield I
building. The annulus seal provides a passive barrier during normal plant operation or when i
the auxiliary building is isolated, preventintthe exfHtrationgupognagnieges from_thef I
middle annuius to the environment.
The ma'iWhr; djemistry /a6ere kry and#ruri@
air dasis ontpovidec{wth local room sapply/dr. co//s ana'osadi/hu /o ma/nfq 1
9.4.3.2.1.2 Fuel Handling Ares Ventilation Subsy e/e9
)
t enwrmnwnk/ condo with/n the orecs sul e kfor iaer.sannel_c0 I
The fuel handling area ventilation subsy s me-ruel rancung area, car oayater i
storage area, and the spent resin equipment and piping rooms. The fue! handling area I
ventilation subsystem consists of two 50 percent capacity supply air handing units, a ducted I
supply and exhaust air system, isolation dampers, dif!' users, registers, exhaust fans, automatic I
controls end accessories.
The ventilation airflow capacity is designed to maintain I
environmental conditions that support worker efficiency during fuel handling operations based I
on a maximum wetbulb globe temperature of 807 (967 drybulb) as defined by EPRI
(
Redsfoo: 7 April 30,1996 9.4 28
] "lWiypcuse l
DCP: GW-6EE-447/OP a_
a
- 9. Auxmary system.
Pcuy 10 i
NP-4453 (Reference 22). He supply air handling units at: tocat:d in the south air handling I
equipment room of the annex building at elevation 135' 3" The units discharge into a ducted supply distribution system which is routed to the fuel handling and rail car bay / filter storage i
I areas of the auxiliary building. De supply and exhaust ducts are provided with isolation I
dampers that close when high airbome radioactivity in the exhaust air or high pressure I
differential with ttspect to the outside atmosphere is detected.
I The exhaust air fans are located in the upper radiologically controlled area ventilation system I
equipment room at elevation 145' 9" of the auxiliary building. The supply and exhaust I
ductwork is arranged to exhaust the spent fuel pool plume and to provide directional airflow I
from the rail car bay / filter storage area into the spent resin equipment rooms. The exhaust i
I fans discharge the exhaust air into the plant vent for monitoring of offsite airbome I
radiological releases.
I The vennlation airflow dilutes potential airborne contamination to maintain the concentration I
at the site boundary within 10 CFR 20 (Reference 21) allowable effluent concentration limits I
and the internal room airbome concentrations within 10 CFR 20 occupational derived air I
concentration (DAQ limits during normal plant operation.
I h4.3.2.1.3 Radiation Chemistry Laboratory Ventilation Subsystem {
I ne radiation chemistry laboratory ventilation subsystem serves the radiation chemisty I
, laboratory, prima y sample room and aunliary building security rooms. De radiation I
' cheaiistry laScratory vendlatica subsystem consists of twci 100 percent capacity supply air j l
handing units, a ducted supply air system, a humidifier, diffusers, registers, automatic controls I
and accessories. The supply air handling units are located it the south air handling equipment I
room of the annex building at elevation 158' 0". He supply air handling units are connected I
to the auxiliary / annex building ventilation subsystem supply air duct to utilize preconditioned I
and prefiltered outdoor air. Supplemental filtration is provided by the radiation chemistry j l
laboratory ventilation subsystem fer added cleanliness tc> support operation of sensitive f I
equipment. A hurmdifier is located in the common supply air ductwork downstream of the I
supply air handling units. The radiation chemistry laboratory exhaust air is ducted to the I
auxiliary / annex building ventilation subsystem exhaust fans. De ventilation airflow dilutes 1
i room internal airbome radioactivity concentrations within 10 CFR 20 occupational derived tir, I
Qoncentration (DAQ limitfs
~
9.4.3.2.2 Component Descripdon The radiologically controlled area ventilation system is commised of the following major I
components. Equipment classified as Class A, B, C or D and applicable codes and standards I
are provided in Section 3.2. Table 9.4.31 provides design parameters for rnajor defense in I
depth components in the system.
1 Revision: 7 y Westhghouse 9.4-29 April 30,1996
^'
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DCP: G W-GEE-447/oP Pa y 11
' Anu=7 sysum o
Supply Air Handling Units i
Each supply air handling unit consists of a low efficiency filter bank, a high efficiency friter i
bank. a hot water heating coil bank, a chilled water cooling coil bank, and a supply fan.
e I
(radiation chemistry laboratory supply air handling units only consist of algh etticieriy ilter i
I (bank, a hot water heating coil bank and a supply fanf I
Supply and Exhaust Air Fans i
i 4
The supply and exhaust air fans are centrifugal type, single width single inlet (SWSD or i
double width double inlet (DWDO. with high efficiency wheels and backward inclined blades I
to produce non-overloading horsepower characteristics. The fans are designed and rated in i
I accordance with ANSUAMCA 210 (Reference 4), ANSUAMCA 211 (Reference 5), and i
AMCA 300 (Reference 6).
I I
I Unit Coolers l
I Each unit cooler consist of a low efficiency filter bank, a chilled water cooling coil bank and I
a supply fan. The normal residual heat removal system pump room unit coolers have 4,
i redundant cooling coil banks.
I I
Low and High Efficiency Filters I
I The low efficiency filters and high efficiency filters have a rated dust spot efficiercy based I
on ASHRAE 52 (Reference 7). De filters minimum average dust spot efficiencies for the I
defense in depth filters are shown in Table 9.4.3-1. De filters meet UL 900 (Reference 8) i i
Class I construction criteria.
~
l I
Electric Unit Heaters I
I ne electric unit heaters are single stage or two-stage fin tubular type. De electric unit heater I
are UL listed and meet the requirements of UL-1025 (Reference 25) and National Electric I
Code.
l I.-hot &bl. Hesting Cous jg 4 g coils are(hot water finned tubular type. The outside supply air heating coils are 1
ne i
provided dit integralTace and bypass dampers to prevent freeze damage when modulating I
the hw output. Coils are performance rated in accordance with ARI 410 (Reference 12).
I I
Cooling Coils I
I l The chilled water cooling coils are counterflow, finned tubular type. De cooling coils are I
designed and rated in accordance with ASHRAE 33 (Reference Il) and ANSUARI 410 I
(Reference 12
-- _=
ectric Hesting Coils
[ The electric heating coils are multi stage fin cubular type. De electric heating coils meet the Revisfoa: 7
, requiremenu of UL 1096 (Referenc
= ct April 30,1996
~ j.30 9
- e. %
.t
%_9. Auxillary Systems Th3 redw3cto building cupply cir flew through%
[
tho inlct v nes of tha cupply fans io modulated l
[
cutomatically by the diffurential pressure controllers to maintain t'ne buildin 9.4.8.2.3 System Operation pressure relative to the outdoors. g at a negative Sensors for
}
the controllers are mounted in the general building area.
/
Other seasors are mounted
/
Normal Plant Operation te2ded frca the ffecta
.,f winc.,
i y
During normal operation, both supply air handling units and both exha> t fans continuously to maintain suitable temperatures in the radwaste bui!dingT nc.d:::.=
A buiMingaupA w new-+s-autometically-modulated-to-maintaima-negathe-pmsure in :
gilding,. Electric interlocks between the truck access doors and the supply fan now control M
4-permits the supply air to drop to 6000 cfm below the exhaust flow when ar.y truc is open. His creates a Dow into the building through the cpen door hN A
alarms are actuated uhen any pressure drop rises to
- a c
pe
,g;,*O'.
need for filter replacement. To replace the filters en a supply unit, the affected supply fan..c 5 and exhaust fan are stopped and isolated from the duct system by means of isola o$90e During filter replacement, the supply and exhaust systems operate at 50 percent c this mode of operation, radwaste processing operations i
e temperature in the radwaste building.
sbu U
,8 A Es "8 y 3 @
e.3 3 ne hot water unit heaters in the mobile systems facility are not normally required
]3l.l5jj to maintain the general building temperature. Rese heaters operate, in response to lo
- 3g 3m thermostat control, to temper air entering the building when a truck access door is e"3
.N '*. O 3(
Ed ud wa !l ne hot water enit heater in the electrical / mechanical room operates in thennostat control to maintain the req'.: ired minimum temperature.
L* !
- b h c Abnormal Plant Operation (D.s t e & 8 * \\ l ooma 5 g g a g, g, ne radwaste building HVAC system is not required to operate during any abnormal albyB*$
2* 8ei38 !
condition.
$y
'", gE.I 9.4.8.3 Safety Evaluation o~+m0B
.250 Y
i
- A85iI g ne radwaste building HVAC system has no safe nuclear safety evaluation.
u UN5NNI 9.4.8.4 Tests and Inspections ne radwaste building HVAC system is designed to permit periodic inspection of system components. Each component is inspected prior to installation. Components of each system are accessible for periodic inspection during normal plant operation. A system air balance test and adjustment to design conditions is conducted in the course of the plant preoperational program. Air flow rates are measured and balanced in accordance with the guidelines of SMACNA HVAC systems - Testing. Adjusting and Balancing (Reference 19). Instruments are calibrated during testing. Automatic controls are tested for actuation at the proper setpoints. Alarm functions are checked for operability.
Revision: 11 February 28,1997 9.4-54 3 Msthgh0036
g
- 9. Auxiliary Systems ne auxiliary boiler room, diesel driven fire pump room, and motor driven fire pump rooms have exhaust ventilators to remove beat generated by the boiler equipment and fire pum Air is pulled from the general area of the turbine building through wall fire damper opening in the rooms and is exhausted outside of the turbine building to the atmosphere. Each fire
)
pump room is heated by a hot water unit heater to provide freeze protection for the fire pumps. liot water heating is not provided in the auxiliary boiler rocm, however, air is pulled from the general area of the turbine building to control space temperature in the boiler room.
9.4.9.1.2 Component Description i
De turbine building ventilation system is comprised of the foHowing major components.
These components are located in the non-scismic turbine building t
IIVAC Air IIandling Units Each air handling unit is a horizontal draw-through cabinet type consisting of a mixing box section, low efficiency filter, high efficiency filter, integral face / bypass damper, hot water heating coil, chilled water cooling coil. The electrical equipment room air handling units
{
include a return air fan and a supply fan. The personnel area air handling units include a I
supply air fan.
Exhaust Ventilators The turbine build;ng roof exhaust ventilttors are hooded, direct driven, propeller type with pneumatic cpera'ed backdraft damper. Ventilators in the auxiliary boiler rocin and fire pump room are smaller, two-speed, propeller type with pneumatically actuated backdraft dampers.
Ventilators in the Itibe oil rooms and restrooms are centrifugal type.
I ShutotT, Control, Balancing, ard Backdraft Dampei7 l
9 TBm o NI'f 1
Multiblade, two-position 6doperated shutor dampers are parallel-blade type.
I 3
Multiblade, control and balancing dan (1 ers are opposed-blade type. Backdraft dampers are i
provided to prevent backflow through shut down fans. Air handling unit and fan shutoff l
dampers are designed for maximum fan static pressure at shutoff flow. Dampers meet the I
performance requirements of ANSI /AMCA 500 (Reference 14).
Unit 11 eaters Unit heaters are the down-blow type with propel'er type fans directly connceted to the fan motor. Each tanit heatar is equipped with a four-way discharge outlet.
Electric Duct IIcaters Electric duct heaters are open grid type. De duct heaters are UL listed for zero clearance and meet requirements of NFPA 70 (Reference 28).
Revision: 11 Fctruary 28,1997 9.4-58 T Westhttlouse J
e e
a
- 9. AuxHlary Systems 4
Electric IIcating Colts 1
ne electric heating coils are multi stage fin tabular type. He electric heating coils meet th 4
requirements of UL 1096 (Reference 10).
Roof Exhaust Fans ne standby exhaust fans are roof mounted, direct drive upblast ventilators. He fans are equipped with gravity dampers that open when the fan operstes and close when the fan is sh down. De diesel oil transfer module enclosure exhaust fans a:e d; rect driven centrift roof ventilators. Th: sentilators are equipped with gravity dampers that open when the fan operates and close when the fan is shut down.
Electric Unit Heaters ne electric unit heaters are single stage or two-stage fin tubular type.
The electric unit heaters are UL-listed and meet the requirements of UL 1025 (Reference 26) and the National Electric Code (Reference 28).
Shutoff, Control, Balancing, and Backdraft Dampers
&l l
Multiblade,two-position shutof perated dam rs are parallel-blade type. Multiblade, control and balancing dampers are op sed-Hade type. Backdraft dampers are prcvided to prevent backflow through shut down fans and to relieve pressure from the service module and diesel genera:ar bJilding. Damprs meet the performance reqairements of ANSI /AMCA 500 (Reference 14).
Fire Dampers Fire dampers are provided at duct penetrations through fire barriers to maintain the fire resistance ratings of the barriers. The fire dampers meet the design and installation requirements of UL 555 (Reference 15).
Ductwork and Accessories Ductwork, duct supports and accessories are constructed of galvanized steel. Ductwork subject to fan shutoff pressure is structurally designed for fan shutoff pressures. Ductwork, supports and accessories meet the design and construction requirements of SMACNA High Pr ssure Duct Constraction Standards (Refere ::e 16) ed SMACNA IfVAC Dut Ccastrt.ction Standards - Metal and Flexible (Reference 17).
Revisiont 11 February 28,1997 9.4-64 3 WeSibgh0i;S8
=-
- g, 4
- 9. Auxillary Systems r*
Cooling Colls De chilled water cooling coils are counterflow, finned tubular type. The cooling coils ar designed and rated in accordance with ASHRAE 33 (Reference 11) and ANSUARI 410 (Reference 12).
4 i
IIcating Coils I
The hot water heating coils are counterflow, finned tubular type. The heating coils are I
provided with integral face and bypass dampers to prevet frecte damage when modu I
heat output. ne heating coils are designed and rated in accordance with ASHRAE 33
^
(Reference 11) and ANSUARI 410 (Reference 12).
Ilumidifier i
The humidifier is a packaged electric steam generator type which converts water to steam an distributes it th:ough the air handling system. De humidifier is designed and rated in accordance with ARI 620 (Reference 13).
I Shutoff, Control, Balancing, and Backdraft Dappers q
V8m(9 W k) i l
Muliiblade, two-position $ssi>wJgoperated shutoff dampers are parallel. blade type.
I Multibiade, control and balancing dan $'ers ue opposed. blade type. Backdraft dampers 1
i provided to prevent backflow through shut down fans. Air handling unit and f.m shutoff dnpers a e deigaed for maximum fan st,' tic pressure at chutoff flow. Dampus meet the i
performance requirements of ANSUAMCA 500 (Reference 14).
1 Fire Dampers i
Fire dampers are provided at duct penetrations through fire barriers to miintain the fire resistance ratings of the barriers. The fire dampers meet the design and installation requirements of UL $55 (Reference 15).
Ductwork and Accessories Ductwork, duct supports and accessories are constructed of galvanized steel. Ductwork subject to fan shutoff pressure is structurally designed for fan shutoff pressures. Ductvork, supports and secessories meet the design and construction requirements of SMACNA High Pressure Duct Construction Standards (Reference 16) and SMACNA IIVAC Duct Construction Standards - Metal and Flexible (Reference 17).
i Revision: 11 February 28,1997 9.4 70
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- 9. Auxilliry Systems I
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[ W85tlngl100$8 Revision: 7 April 30,1996 9.4-101
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'^
VBS CLASS 1E ELECTRICAL ROOM HVAC SUBSYSTEM A&C From AllUs To AllUs ToExhaust MS-03A/C MS-03A/C Fans MA-07A/C Division A Rooms Ventilation N
Div. A Electrical Penetration Room Div. A I&C Room Div. A DC Equipment Room Div. A Battery Room p
k Division C Rooms Ventilation MCR/A&C Equipment Room g
Div. C RCPTrip Switchgear Room N
N Div. C I&C Penetration Room h
Div. C l&C Room Div. C DC Equipment Room Div. C Battery Rooms 1 & 2 General Areas Ventilation MCR/A&C Equipment Room Stair Spare Battery Charger Room U
Spare Rooms y
y Div. B RCP Trip Switchgear Room Corridors SpareIlattery Room cauwuuwiwuoneis r ath l
1
VBS CLASS IE ELECTRICAL ROOM HVAC SUBSYSTEM B&D To Exhaust From AHUs To AllUs Fans MS-03B/D MS-03B/D MA-07B/D i
A h
y B&D Equipment Room y
Division B Rooms Ventilation I
Div. B I&C Penetration Room m
m r
m Div. B DC Equipment Ro~om 4
{
Div. B Battery Rooms 1&2 O
I N
9a N
A Division D Rooms Ventilation v
Div. D I&C Penetration Room
~
m m
Div. D DC Equipment Room Div. D Battery Room t
General Areas Ventilation Stair Remote Shut Down Area 3
Access Area Corridor Corridor i
CNT)WERPN1\\NROU2 li'l' dih
i
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1
- 9. Auxiliary Systems
- t -
9 I
)
NOTES
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REFERENCES am..
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.43 1.EML. l 2 l 2 i k's
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m aI mtan m
as I Figure 9.4.21 (Sheet I of f
i m=g Annex / Aux Non Radioactive Ventilation System i
Piping and Instrumentation Diagram l
4 i
Revision: 7 W W65tingh0036 A ril 301996 P
9.4-103
- s...
,5 i
- 9. Auxiliary Systems t
1
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9.
E l
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Figure 9.4.21 (Sheet 2 of s
Annex / Aux Non Radioactive Vent!!ation System Piping and Instrumentation Diagrann 1
Revision: 7 W W65tirighouS6 April 30,1996 9.4-105
VXS EQUIPMENT ROOM HVAC SUBSYSTEM To AllUs From AllUs MS-02A/B To atmos MS-02A/B or to atmos Jk Air liandling Equipment JL Room Exhaust Plenum 2 Central AlarmStation Ik m
Access Corridor Exhaust Fan Y
Security Room 2 MA-13 D
N' -
A Corridors g
Rest Rooms g
4 gA Access Area i
Security Room I s
Battery Rooms Battery Charger Rooms U
To Exhaust Fans, MA-09A/B, RCC/Non-lE Pcnetration Room in VXS Switchgear Room llVAC Subsystem U
ReactorTrip Switchgear Rooms ICC/Non 1-E Penetration Room CNT)WERPN1\\NRnus4 li'l dth
L VXS SWITCHGEAR ROOM HVAC Sl;BSYSTEM To AllUs From AHUs MS-05A/B To atmos Of MS-05A/B to atmos Jk 4L Exhaust Plenum 1 k
U Electrical Switchgear Rooms 1 & 2 l
35 Exhaust Fans MA-9A/B Y l
GF 4 S
4 From Battery Rooms in VXS A
N Equipment Room Subsystem
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i f
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i
VXS MECHANICAL EQUIPMENT AREA SUBSYSTEM Upper South Air Handling Equipment Room Lower South Air Handling Equipment Room l4 Air Handling Unit 4
E 4
a n
Air Hand..i.g Unit
\\
y s
%s a
- .s N
Boric Acid Batching Room I
I i
Demineralized Water Deoxygenating Room
[
k I
C:sFUWERPNr NRC003 PPT dth
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m
I ' *. * * .1
- 9. Auxilkry Systems wu i
d i
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Figure 9.4.3-1 "N'
OncefIoh3 diologically Controlled Area Ventilation System Piping and Instrumentation Diagram Revision: 7 3 Westingh00S6 v
April 30,1996 9.4-107 s,
- -.. - - - - - =.
VAS AUX / ANNEX BUILDING HVAC SUBSYSTEM Auxiliary Buildmg Outside Air Elevator Machine Room, CCS Valve Room Stairwell, Access Corridor, Vestibule, VAS Equipment Room, Personnel Access U
Area, VES Air Storage / Operating Deck, Staging Area, Security AHUs Room MS-01 A/B Corridor El.117'- 6", VFS Penetration Room, VFS/SFS/PSS Annex Building Penetration Room, Security Room Staging and Storage Area, Contain Air Filtration Exhaust Rooms, Corridor El.100'- 0", RNS Heat Exchanger Room, Waste Monitor
+
Containment Access Corridor Rooms A & B, Middle Annulus, Middle Annulus Access Room, Personnel Hatch, Maintenance Flcor Staging Area U
Corridor El. 82'- 6", Piping / Valve Room, WLS Pump Rooms. SFS U
Pump Rooms, SFS Hx Rooms, Demin Filter Access Area, Rad m
Chem Lab, CVS Makeup Pump Room, SFS Penetration Room, Lower Annulus Southeast, Lower Annulus Southwest, Lower Annulus Valve Area, Lower Annulus East, Pipe Chase, Degasifier D
Column Room, Containment isolation Valve Room e4 Corridor El. 66'- 6", Primary Sample Room, RNS Pump Rooms, 4
Demineralizer Filter Room, WGS Equipment Room, WLS
'y l'quipment Room, Degasifier Discharge Pump Room. Ef0uent O
Iloidup Tank Rooms, Aux Building Sump Room, Waste Monitor b
Tank Room C, Chemical Waste Tank Room Y
l f V
to
==
i
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RE
- - - - > To VFS Filtered Exhaust *
> To VFS Plant Vent V
! C
- Filtered Exhaust used when radiation is detected Exhaust Fans caowoumwnnnonis i ath MA-02A/B
VAS FUEL HANDLING AREA HVAC SUBSYSTEM OutsideAir 1 f To VFS Filtered Exhaust
- AllUs MS-02A/B n
i I
l RE I
I 8
i y
Fuel llandling Area, Rail Car Bay / Filter Storage Area, Resin l
l
> To VFS t>lant Vent
[
Transfer Pump / Valve Room, Spent Resin Tank Room, Waste i
Disposal Container Area, WSS Valve / Piping Area Exhaust Fans D-MA-06A/B h
N 4
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A Cg x.
w ut i
- Filtered Exhaust used when radiation is detected L?JUWEld'N1%ROEMit li'i JIh
t
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- 3. Design of Structures, Components, Equipment and Systems c
Table 3.2-2 SEISMIC CLASSIFICATION OF BUILDING STRUCTURES Structure Category Nuclear Island C-I Basemat Containment Interior Shield Building Auxiliary Building Containment Air Baffle Containment Vessel C1 Plant vent and stair structure C-II Turbine Building NS Annex Building Columns A - F NS Muilding-eciumns F - I
-C4
_ )
Radwaste Building NS
~~ ~ ~~
Diesel Generator Building
-NS Circule. ting Water Pumphouse and Towers NS.
C-I. Seismic Category 1 C-D - Seismic Category II NS-Non-seismic Note:
1.
Within the broad definition of seismi. Category I and 11 stmetures, these buildings contain members and structural subsystems the failure of which would not impair the capability for safe shutdown. Examples of such systems would be elevators, stairwells not required for access in the event of a postulated earthquake, and nonstructural partitions in nonsafety related areas. These substructures are classified as non-seismic.
Revision: 11 k'
February 28,1997 3.2-20 W Westlrighouss e
4 to
.d, to NSD-NRC-97-5087 a
Mark Up for incorporation of Radioactive Chemistry Laboratory Sub-System into the Auxiliary / Annex Building Wat!!alion Sub-System W
l li b
4 9
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7 3
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- 9. Auxillary Systems Pc$e 8 e
I Temperature I
('F) i Spent resin equipment rcoms
. 50 - 130 l
Radioactive pipe chases and valve rooms.
. 50 - 130 I
I Occupied Areas l
1 Fuel handling area 50 - 96 i
Radia 'on chemistry laborat_ory 73 78 _
l nmary am
_fff E ] [..
I Secunty rooms
' ]{ pfdf o - 78 I
9.4.3.2
System Description
i ne radiologically controlled area ventilation system consists of the following subsystems:
I I
Auxiliary / annex building ventilation subsystem I
dFu I handlin_g _ area ventilation sgui>2!alhegglaboramy m_
i l
I ne defense in depth portion of the system is s in_ Fig =ure 9.4.3-1.
,=-
&l! -
m-c pu,. J endsfW[Q4e ofM., Con $btr>me 9.4.3.2.1 General Description M ewsf h4t. rosm.$ CM7a' /mt##
I 9.4.3.2.1.1 Auxiliary / Annex Building Ven a Subsyste l
amb I
ne auxiliary / annex building en ~ ation subsystem serves radiologically control!_e_d equipment, I
piping and valve roomd __ jacent access and staging areaQ,t'helradiation_chenu I
atiorafory ventilauon subsysteB. De auxiliary /a'anex building venulation subsystem consists
~
I of two 50 percent capacity supply air bandling units, a ducted supply and exhaust air system, I
isolation dampers, diffusers and registers, exhaust fans, automatic controls and accessories.
I ne supply air handling units are located in the south air handlmg equipment room of the I
annex building at elevation 158'-0". De units discharge into a ducted supply distribution I
system which is routed through the radiologically controlled areas of the auxiliary and annex I
buildings. De supply and exhaust ducts have isolation dampers that close to isolate the I
auxiliary and annex buildings from the outside environment when high I
is detected in the exhaust air duct. De supply and exhaust ducts _are configured so that_two I
building zones r:uy be independently isolated, The annex buildin adjacent auxdiary building staging, equipment areas, andsroomsfe7ved by the radiarion c try Imboratory ventilannn I Serth quosysterwan aligned to one zone.,ne other zone includes)pnmarilypawaste equipnunt]
grooms, pipe chases, and Waccess corridors 0ccated in the auxiliar9 buiTdinsf A
i radiation monitor is located in the exhaust air duct from each zone.
j i
The exhaust air fans are located in the upper radiologically controlled area ventilation system i
equipment room at elevation 145'.9" of the auxiliary building. He exhaust air ductwork is routed to minimize the spread of airborne contammation by directing the supply airflow from
=e-the rodeflon chemkfry laborafory, primary sompk room,"
sA*n t Ar/poe/ cee/me cualsa pump anchee t exchenjet. room.9, April 30,1 R * *'*I**; '
W Weseghouse d
9.4-27 f t/% mais..
avaan ren m /ma a o,.e no.p/arand heef e>.chenyer rooms normal /tH' duck bt0Yt'tM*ValPum middle annul 3 and VQttout
UJ%
pcp sw. GEE-447/0P l
l Poye12
- 9. Auxiliary systems a
4 I
occurring within the fuel handling are.3, fire dampers automatic.111y !.,olate the F/AC l
ductwork penetrating this fire area wnen the local air temperature exceeds predetermined I
serpoints.
I 9.4.3.2.3.3 Radiation Chemistry Laboratory Ventilation Subsystem Normal Plant Operation I
During normal plant operation, one of two supply air handling units operates continuously to I
ventilate the areas served on a once through basis. The supply airflow rate is modulated to I
rnuntain the radiation chemistry laboratory at a slightly negative pressure differential with respect to the adjacent access corridor. The exhaust air is unfiltered and directed to the plant I
vent by the auxiliary / annex building ventilation subsystem for monitoring of gaseous offsitef I
releases.
I I
I ne temperature of the supply air is controlled by a temperature sensor located in the radiatior I
chemistry laboratery. When the radiation chemistry laboratory room air temperature is low.
I hot water valves to the supply air hot water heating coils are opened to maintain the room I
temperature within its normal design temperature range. The security room and primary I
sample room temperature conditions will vary according to the demand for supplemental hear I
in the radiation chemistry laboratory. A humidifier maintains the relative humidity in the I
areas served above 35 percent for personnel comfort during periods of low outside humidity I
conditions. The exhaust air from the radiation chemistry laboratory and primary sample room i
1 is continucusly monitored by a smoke monitor to:ated in the co;ranon edaust air ductwork.
i 1
The operating supply air handling unit ir automatically shut down and the standby unit is I
started if the supply airflow rate is below a predetermined setpoint.
I Abnormal Plant Operation l
I If high airbome radioactivity is detected in the exhaust air from the annex Mi'. ding (which I
includes the exhaust air from the areas served by tne radiation chemistry laberatory ventilation I
subsystem), the annex building supply and rxhaust air isolation dampets close and the I
r,diation chemistry laboratory supply air haroling unit fan is automatic?lly shut down. The I
containment air filtration system provides f'.ftered exhaust to maintain the isobred zone at a i
slightly negative pressure differential with respect to the outside environrrient and adjacent I
unaffected plant areas. Other abnormal conditions causing closure of the annex building I
isolation dampers also shut down the radiation chemistry laboratory supply air handling unit I
fans.
I I
If smoke is detected in the common exhaust nr duct from the radiation chemistry laboratory I
and primary sample room, an alarm is initiated in the mam control room. The radiation I
chemistry laboratory remains in operation unless plant operators determme that there is a need I
to manually shut down the subsystem. In the event of a fire occurring within the areas served, I
the HVAC ductwork penetrating fire barriers close if the local air temperature exceeds predetermined serpoints.
q Rewfoa: 7 April 30,1996 9.4 34 W L ikgT60sg
~
,