ML20246L254
| ML20246L254 | |
| Person / Time | |
|---|---|
| Site: | Comanche Peak |
| Issue date: | 08/28/1989 |
| From: | William Cahill TEXAS UTILITIES ELECTRIC CO. (TU ELECTRIC) |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| TXX-89605, NUDOCS 8909060290 | |
| Download: ML20246L254 (14) | |
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EE Log # TXX-89605 1
C File # 10010 r
r 909;4-TilELECTRIC August 28,'1989
. Executive Vice Presodent
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'U.:S. Nuclear Regulatory Commission
' Attn: Document Control Desk Washington D. C.
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SUBJECT:
. COMANCHE PEAK STEAM ELECTRIC STATION (CPSES)-
' DOCKET NOS. 50-445 AND 50-446.
ADVANCE FSAR SUBMITTAL-HVAC GRAVITY DAMPER UPGRADE-FSAR SECTION 9.4' t entlemen:
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,This!1etter provides an advance copy of changes to be included in'a future FSAR amen'dment. These changes upgrade the gravity dampers on the discharge side of *he Primary Plant Ventilation System's supply units and revise section' figur.
o cIn! order to facilitate NRC Staff review'of this change, the attachment is organized as follows:
'l. ; Draft revised FSAR pages, with change portions indicated by a bar.in the margin, as they are-to appear.in a. future' amendment.
2 '. A detailed description / justification for the change, 3.
A copy of a related SER section.
4..
A page containing the title of a " bullet" which conso11 dates and categorizes similar individual changes by subject and related SER section.
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'8909060290 890828 PDR ADOCK 05000445 A.
/ sf 400 North Olive Street LB 81 Dallas, Texas 73201
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August-28.-~1989 Page'2.of 2 i
5.
The bold / overstrike version of the revised FSAR pages. referenced by:the detailed description / justification for the changes identified above. The bold / overstrike version facilitates review of.the revision'by highlighting each addition'of new text in bold type font L,
and overstriking'with a slash-(/) the portion of the text'that is
~
- deleted..
Sincerely,
)h William J. Cahill, Jr.
By:
adfA h Lk Roge #D. Walker b
Manager, Nuclear Licensing.
j MCP/ deb
- l Attachment' c - Mr.
R."D. Martin, Region IV' i
Resident' Inspectors,-'CPSES (3) i
)
I i
F-i
Attachment to TXX-89605 August 28, 1989 p.
Advance FSAR Submittal Concerning HVAC Gravity Damper Upgrade Item 1 Draft Revised FSAR Pages 2 to 4 Item 2 Detailed Description / Justification for 5
Changes Item 3 Related SER Section 6 to 8 Item 4 Bullet Title 9
Item 5 Bold /0verstrike Version of Revised FSAR 10 to 12 Pages Page 1 of 12 l
l
n. Att thment to'TXX-89605-p,
FAugust 28,0 1989
.CPSES/FSAR v
.Pa.ge 2 of.12 f
' Chilled' water for the cooling coils is-provided by the plant i
ventilation chilled water, system.
(See Appendix 9.4E.)
Heating coils l<-
l are electric. The exhaust system is seismic Category I up to the fan 1,
. discharge. The air supply system is non-nuclear safety seismic DRAFT Category II except for the fan discharge gravity dampers that. shall be safety Class;3 and seismic Category I.
9.4'.3.3' Safety Evaluation 41 The reliability an~i safety. of the Auxiliary Building ventilation 41 system is ensured by the following features:
1.
' Instrumentation and controls which incorporate audible and visual
..I
. alarms in the Control Room facilitate' continuous monitoring'of performance and alert the operator in the event of system malfunction.
2.
Standby supply units can be remotely actuated from the Control 41 Room.
3.
. Deleted 53 4.
The-Auxiliary Building exhaust system is of ANS Safety Class'3 68 and seismic Category I, and NNS, seismic Category II design.
5.
Failure modes for dampers are set so that they do not render the 56 system inoperable.
6.
Adequate cooling of safeguard equipment is ensured by the 56 operation of the emergency fan coil units.
7.-
Exhaust air is passed through iodine adsorber filter beds prior 56 to its discharge.
It is also monitored by an in-line radiation monitor at the ventilation duct outlet.
8.
The safety Class 3 and seismic Category I gravity dampers at the fan discharge of the primary plant ventilation system and the 9.4-23 Draft Version
{
b 2
Attach 22nt to TXX-89605
.: August ~28,-1989 CPSES/FSAP LPage 3 of 12-Auxiliary Building Ventilation Equipment Room will-insure the negative pressure envelope boundary.
L
. '5 6 The' Auxiliary Building and radwaste area ventilation exhaust is
. located in;the primary plant ventilation equipment room at elevations 873 ft 6 in. and 886 ft 6-in. of the Auxiliary Building, as shown-in Section 1.2, Figure-1.2-35. The Auxiliary Building is a seismic Category I structure, and the air inlet and. duct leading to the Auxiliary Building ventilation system are designed to appropriate seismic requirements and to withstand the tornado loads and tornado-related missile conditions described in Section 3.3.2.
The intake louvers ar,e facing. west, toward the Turbine Building.
9.4.3.4
. Inspection and Testino Requirements
-76 1.
See Subsection 9.4.2.4.
76 2.
The HEPA and iodine adsorbers of the non-ESF units are tested periodically during plant operation in accordance with NRC Reg.
Guide 1.140 (See appendix 1A(B)).
Filter' units are arranged to facilitate filter replacement.
9.4.4'
' TURBINE BUILDING AREA VENTILATION SYSTEM 9.4.4.1 Desian Bases The Turbine Building is provided with outside air as required for ventilation and heat removal.
(See Figure 9.4-3 and Tables 9.4-1 and 9.4-2.)
4' The Turbine Building ventilation system is designed to provide sufficient heat to ensure freeze protection of equipment during the winter months and to provide a sufficient airflow quantity in order to remove the heat generated by equipment located in the Turbine Building. The Turbine Building ventilation system is not required to operate following a DBA or loss-of-offsite-power condition.
Draft Version 9.4-24
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- AttachTnt to TXX-89605 DETAILED DESCRIPTION
' August 28 1989f 0
' Paga 5 of-12
-FSAR PCge-(as amended)
GrouD Description Table-17A-1 2
See Sneet No(s): Sheet 31 Updates Table 17A-1 for consistency to include the upgraded gravity dampers.
Revision:
Table 17A-1 requires updating for consistency to include the upgraded gravity dampers on the discharge side of the Primary Plant Ventilation System's supply units.-
FSAR Change Request Number: 89-537.1
'Related SER Section: 9.4.3 SER/SSER Impact: No 9.4 23 2
Upgrades the gravity dampers on the discharge side of the Primary Plant Ventilation System's supply units.
Revision:
The gravity dampers on the discharge side of the Primary Plant Ventilation System's supply units have been upgraded to Safety Related Class 3 and Seismic Category I from Non-Safety Seismic Category II.
This was done in order to take credit for the dampers to close during a postulated accicent scenario and be able to maintain a slight negative pressure in the buildings.
The air supply system's seismic category rating was corrected to reflect as-built conditions.
FSAR Change Request Number: 89-537.2 Related SER Section: 9.4.3 SER/SSER Impact: No Figure 9.4-9 3
Revises airflow rates for the HVAC equipment rooms in the Auxiliary Building.
Update:-
Calculations for airflow rates were regenerated to determine the ventilation requirements for the HVAC equipment rooms in the Auxiliary Building following a postulated LOCA.
FSAR Change Request Number: 89-537.3 Related SER Section: 9.4.3 i
SER/SSER Impact: No L
! 't JAttachee'nt:to TXX-89605
.' August 28, 1989 Pagg,p,g,1 radioactivity. from a fuel handling : accident does not result'in
- unacceptable _offsite exposures (as discussed above).
The design.of the fuel handling building ventilation system as described above ensures (1)-that ESF filtration will be available under normal conditions and for. loss of offsite power and (2) that unfiltered release of radioactivity from
-a fuel handling accident will not result in unacceptable offsite exposures.
Thus, the guidelines of Regulatory Guide 1.13 for preventing unacceptable release of radioactive contaminants to the environment are satisfied.
The supply ducts and primary plant ventilation supply system components are all classifinid as nonnuclear-safety grade.
The supply ducts are riesigned to remain in place and thus do not pose a hazard to. safety-related equipment in the event of a safe-shutdown. earthquake, in accordance with Regulatory Guide 1.29.
The fuel handling exhaust. ducts are designed to Quality Group C and seismic
)
Category I criteria up to the exhaust fan discharges.
The primary plant exhaust filtration units and ESF exhaust filtration units are designea to Quality Group C cnd seismic Category I requirements.
Although failure of ttft nonseismic Category I supply system could permit-an -
unfiltered release of radioactivity during a safe-shutdown earthquake, the resultant offsite dose would be well within the guidelines for offsite dose limits as discussed above. Thus', the supply system need not be designed to seismic Category I requirements.
The fuel handling building ventilation. system is located in the auxiliary building and fuel building, which are seismic Category I, flood, and' tornado protected structures (refer to Sections 3.4.1 and 3.5.2 of this SER).
Thus, the requirements of GDC 2 and the guidelines of Regulatory Guides 1.26 and 1.29 are met.
The fuel handling building ventilation system is separated from the effects of internally generated missile and high-and moderate-energy pipe breaks (refer to Sections 3.5.1.1 and 3.6.1 of this SER).
The redur, dant ESF exhaust filtration units are physically separated from each other by walls designed to preclude l
c' incident damage to redundant equipment from pipe rupture, equipment failure, and missile generation.
The auxiliary building provides protection to the ESF exhaust filtration units against the effects of tornado missiles.
Thus, the requirements of GDC 4 and the guidelines of Regulatory Guide 1.117 and BTP AS8 3-1 pre satisfied..
I F aed on.the above, the staff concludes that the fuel handling building ventila-tion system is in conformance with GDC 2 and 4 as they relate to protection against natural phenomens, missiles, and environmental effects and the guidelines of Regulatory Guides 1.13, 1.26, 1.29, and 1.117 and BTP ASB 3-1 as they relate i
to protection against radioactive releases seismic and quality proup classifica-tion, protection against tornado missiles, and high and moderate-energy pipe breaks, and is, therefore, acceptable.
9.4.3 Auxiliary Building and Radwaste Area Ventihtion System The auxiliary building (controlled access area) and radwaste area ventilation system are designed to maintain suitable and safe ambient conditions for operating equipment and personnel during normal plant operation and to maintain a slightly negative pressure with respect to the environment during all modes of operation.
9-23
.m JAttachsent to TXX-89605.
.. W
[ August 28..1989 Page '7 $[rh normalfoperation, air supply and exhaust is provided b a ventilation system.
After a loss of offsite-power or followiny the' primary plant accident, a slightly negative pressure is maintained in the bu 1 a design-basis the nonsafety-related supply system and exhausting the' a
.wsafeguards features (ESF) exhaust filtration units.
filtration units:are powered from separate class 1E emergency buses.
The redundant ES.: exhaust-are evaluated in Section~6.5.1 of this report.
The filters
. Emergency fan coil units are
. provided to cool the component cooling water puso rooms and chargin under accident conditions.
in Section 9.4.4 of this report.The emergency fan coil _ units are discussed further The design-basis accident for the auxiliary building ventilation system is a break in the CVCS letdown line in the auxiliary building (refer to Section of this SER).
ESF filtration of the auxiliary building exhaust is required to.
reduce the offsite exposure from this accident to acceptable values if the.
break is not isolated within 30 min.
A single failure of the exhaust das!pers could block flow to the suction side of the ESF exhaust filtratio result in an unffitered release of radioactivity from the auxiliary building.
However, because of the quantity and variety of CVCS and other plant in tion which would alert the operator to a line break, it 14-expected that a CY letdown ifne break would be isolated within 30 min.
i would not be required to reduce offsite exposures to acceptable limits, an staff concludes that the auxiliary building ventilation system need not be designed to accommodate a single active failure.
The supply ducts and primary all classified as nonnuclear plant ventilation supply system components are safety grade. However the supply ducts are designed to remain in place during a safe-shutdown e,arthquake and thus do n
~
pose a hazard to safety-related equipment.
The auxiliary building and radwaste
.exheust filtration units fan discharge. area exhaust system is of se seismic Category I criteria. units and ESF exhaust filtration units tion system, including the primary plant ventilation system and E Category I structure and which provides protection and tornado-missiles (see Sections 3.4.1 and 3.5.2 of this report).
and are designed to withstand tornado loads and torn The inlet Although failure of the nonseismic Category I supply system could permit an unfiltered release of radioactivity in the event of a CVCS letdown line bre the resultant offsite dose would be within the guidelines for offsite dose Ifmits 4
as discussed above.
The ventilation supply system need not be designed to seismic CateE.atoryGuides1.25 cry I requirements.
Thus, the requirements of GDC 2 and the guidelines of Regu
, 1.29, and 1.117 are met.
l The auxiliary building and radwaste area ventilation system is separated from1 breaks (refer to Sections 3.5.1.1 and 3.6.1 of this SER).t exhaust filtration units are physically separated fram each other by wallsThe re designed to preclude coincident damage to redundant equipment from pi equipment failure and missile generation.
and the guidelines, of BTP ASB 3-1 are satisfied.Thus, the requirements of GDC 4 9-24 c::assumm ause~
F
>Attachmant to TXX-89605
' August 28,.1989
' Ta' sed on tb above,'the. staff concludes that.the auxiliary building and-radwast
- area ventilation system is in conformance with GDC 2 and 4 as they relate-to protection.against natural phenomena, missiles and environmental effects and
.the guidelines of Regulatory Guides 1.26 1 toseismicand-QualityGroupclassificatIon.29,and1.117andBTPAS83-1 relating and protection against tornado i
missiles and high-and moderate energy pipe breaks.
The system-is, therefore, acceptable.
9.4.4 Safeguards Building Ventilation System The safety-related portions of the safeguards butiding ventilation system include parts of the ESF ventilation system and the electrical areas fan cooling units.
The function of the ESF ventilation system is to provide suitable ambient condi-tions for personnel and equipment and to maintain the mechanical equipment areas ~
of.the safeguards building at a negative pressure with respect to the environment.
The electrical areas ventilation system safety function is to cool the safe-guards electrical areas in the event of a loss-of-offsite power or a LOCA.
The normal ventilation for the mechanical equipment areas.is provided by the primary plant ventilation systes; during a loss-of-offsite power or LOCA, a negative pressure is maintained by the ESF exhaust filtration units. The primary plant ventilation system and ESF exhaust filtration units are discussed in
' Sections 9.4.2 and 9.4.3 of this report,-and the filters are evaluated in Sec-tion 6.5.1.
Cooling for both the mechanical and electrical equipment areas is provided by fan coil units in the event of a loss-of-offsite power or LOCA.
The exhaust ducts for the mechanical equipment areas are designed to seismic Category I criteria as are the ducts associated with the fan coil units in the electrical areas. All other ducting and ventilation equipment in these areas is designed to remain in place during a safe-shutdown earthquake and thus will not pose a hazard to safety-related equipment in accordance with the guidelines of Regulatory Guide 1.29.
The emergency fan col 1~ units in t u safeguards building are designed to Quality Group C and seismic Category I criteria o are the fan coil units discussed in Sections 9.4.2 and 9.4.3 of this report for the fuel building and auxiliary building, respectively.
The emergency fan coil units are located in the fuel building, auxiliary building, and safeguards buildings, which are all-seismic Category I structures and which provide protection against floods, tornadoes, and tornado-sissiles (refer to Sections 3.4.1 and 3.5.2 of this SER).
Thus, the. safeguards building ventilation system and the emergency fan coil units meet the requirements of GDC 2 and the guidelines of Regulatory Guides 1.26, 1.29, and 1.117.
Each emergency fan coil unit that must operate in the event of a loss-of-offsite power or loss-of-coolant accident is powered from the same Class IE emergency
. bus as the equipment it serves.
Each emergency fan coil unit is designed to start simultaneously with the equipment it serves.
Cooling for the emernency fan coil units is provided by the safety chilled-water systes discussed in Section 9.4.5 of this report.
In general, a single failure of the safeguards building ventilation system will not preclude performance of its safety function.
A single failure of any emergency fan coil unit, its power supply or its cooling water sugly will not preclude perfomance of the essential functions needed for safe siutdown or accident aitigation in the event of a loss-of-offsite power or loss of-coolant 9-25
' M ult IS[ [949 l
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-li P49e'9fof,12
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l 9.4 Heatina. Ventilation.~and Air Conditioning System
'6.
-The FSAR has. upgraded the gravity dampers on-the-
.SPLB o
discharge side of the Primary Plant-Ventilation
-System's Supply units from Non-Safety Seismic Category II to Safety-Related Class 3 and Seismic Category I.
j
(:
i
Att:chment to TXX-896051 Argust 28. 1989 q
' CPSES/FSAR F
Page 10 cf 12 L
Chilled water forfthe cooling coils is provided by the plant ventilation chilled water system.
(See Appendix 9.4E.)
Heating' coils are electric. The exhaust system is seismic Category I up to the fan l
discharge.. The air supply system is non-nuclear. safety seismic Category II except for the fan discharge gravity dampers. that shall be safety Class 3 and seismic Category I idisdit Edfdddtf'I dMdpf fdt tK4 fidi dd6 tK4 thfdti 4MitK its idittit tit 466tf 11.
9.4.3.3 Safety Evaluation 41 The reliability and safety of the Auxiliary Building ventilation 41 system is ensured.by the-following features:
1.
Instrumentation and controls which incorporate audible and visual 41 alarms in the Contrcl Room facilitate continuous monitoring of performance and alert the operator in the event of system malfunction.
2.
Standby supply units can be temotely actuated from the Controi 41 Room.
l53 3.
Deleted 4.
The Auxiliary Building exhaust system is of ANS Safety Class'3 68 and seismic Category I, and NNS, seismic Category II design.
5.
Failure modes for dampers are set so that they do not. render the 56 system ino;,erable.
6.
Adequate cooling of safeguard equipment is ensured by the 56 operation of the emergency fan coil units.
7.
Exhaust air is passed through iodine adsorber filter beds prior 56 to its discharge.
It is also monitored by an in-line radiation monitor at the ventilation duct outlet.
8.
The safety Class 3 and seismic Category I gravity dampers at the fan discharge of the primary plant ventilation system and the 9.4-23 Bold /0verstrike Version
N
" Attachment to NX-89605
"~
.[ August 28.i1989 CPSES/FSAR.
Auxiliary Building Ventilation Equipment Room will insure the-negative pressure-envelope boundary.
E56 3 The Auxiliary Building and radwaste aren ventilation exhaust'is located in the primary plant ventilation equipment room at elevations 873 f t 6 in. and 886 f t 6 in. of the Auxiliary Building, as shown in Section 1.2, Figure 1.2-35.
The Auxiliary Building is a seiscic Category I structure, and the air inlet 'and duct leading to the.
~
Auxiliary Building ventilation system are designed to appropriate seismic requirements and to withstand the tornado loads and tornado-related missile conditions described in Section 3.3.2.
The intake louvers are facing west, toward the Turbine Building.
9.4.3.4 Inspection and Testino Requirements
'76I 1.
See Subsection 9.4.2.4 76~
2.
The HEPA'and iodine adsorbers of the non-ESF units are tested periodically during plant operation in accordance with NRC Reg.
- Guide 1.140'(See appendix 1A(B)).
Filter units are arranged to facilitate filter replacement.
9.4.4-TURBINE BUILDING AREA VENTILATION SYSTEM 9.4.4.1 Resien Bases The Turbine Building is provided with outside air as required for ventilation and heat removal.
(See Figure S.4-3 and Tables 9.4-l'and 9.4-2 )
14
.The Turbine Building ventilation system is designed to prtaide sufficient heat to ensure freeze protection of equipment during the winter months and to provide a sufficient airflow quantity in order to remove the heat generated by equipment located in the Turbine o r e 01 owi g DBA r of e pow r o it n 9.4-24
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