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L0-0319-64787
Enclosure 1:
"ACRS Presentation Chapter 10 - Steam and Power Conversion System," PM-0219-64501, Revision 1
NuScale Power, LLC 1100 NE Circle Blvd., Suite 200 Corvallis, Oregon 97330 Office 541.360-0500 Fax 541.207.3928
www.nuscalepower.com
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NuScale Nonproprietary
NuScale FSAR Tier 2, Ch. 10 ACRS Presentation
Zack Houghton, P.E. Mechanical Design Engineering Manager
March 21st, 2019
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Acronyms ABS: Auxiliary Boiler System
CARS: Condenser Air Removal System
CFWS: Condensate and Feedwater System
CNTS: Containment System
· COL: Combined Operating License
CPS: Condensate Polishing System
CWS: Circulating Water System
DCA: Design Certification Application
DHR HX: Decay Heat Removal Heat Exchanger EPRI: Electric Power Research Institute FAC: Flow-accelerated Corrosion
FW: Feedwater
FWRV: Feedwater Regulation Valve
FWT : Feedwater Treatment System
GDC: General Design Criteria
HP: High Pressure
IP: Intermediate Pressure
ITAAC: Inspections, Tests, Analyses, and Acceptance Criteria
LP: Low Pressure
MC: Main Condenser
MS: Main Steam
MSIBV: Main Steam Isolation Bypass Valve
MSIV: Main Steam Isolation Valve
MSS: Main Steam System
MSSV: Main Steam Safety Valve
NEI: Nuclear Energy Institute
NS: Non safety-related
NSAC: Nuclear Safety Analysis Center
PDC: Principal Design Criteria
RG: Regulatory Guide
RIT: Radiation Indicating Transmitter
RT: Radiation Transmitter
RXB: Reactor Building
SR: Safety-related
SG: Steam generator
TEWAC: Totally Enclosed Water to Air Cooled
TG: Turbine generator
TGS: Turbine Generator System
VFD: Variable Frequency Drive
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Ch. 10 - Topics • 10.1 Summary description
• 10.2 Turbine Generator
• 10.3 Main Steam Supply System
• 10.4 Other Features of Steam and Power Conversion System
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Ch. 10.1 Summary Description
• The NuScale steam and power conversion system is comprised of the following systems: - Turbine generator system
- Main steam system
- Main condenser
- Condenser air removal system
- Turbine gland sealing system
- Turbine bypass system
- Circulating water system
- Condensate polishing system
- Condensate and feedwater system
- Auxiliary boiler system
- F eedwater treatment system 4
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Ch. 10.1 Summary Description Figure 10.1-1: Power Conversion System Block Flow Diagram
ans
-:-+
s ; C . Cl E
SG
Removab le Spool Pieces
Seismic 'till Seismic Anchor Localed at Exl
FranRXB
MSS
ABS
Valves
Aux Steam Header 4---+'
Seismic Anchor Located al Entrance to
RXB ! Removable Spool Pieces
SG
CNt
LEGEND Steam Gererator & Aux Boiler c::::::J
Containment System -Main Steam System -
Turbine Generator System -Condensate & FeedNater System -
Condenser Air Removal System c::::::J
Turbine Bypass Valve
MSS ...+.TGS
Exhauster Packages
To Alm
Feedwater Pumps Gland Steam Condenser
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Feedwater
MSS
f'.", ..,. HP t "'f,. CFWS
TG
t • CFWS
To Alm
Condenser Air Removal Packages
Condensate Pumps
Nu Scale Power Cycle Block Flow Diagram
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Ch. 10.1 Summary Description
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Power Island Layout
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Condenser
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Ch 10.2 Turbine generator system
• Converts thermal energy from SG into rotational energy
• Turbine control valves regulate steam flow from SG
• Generator directly coupled with turbine
• Vendor to be selected by COL applicant
Component
Turbine
Generator
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Parameter
Rotor
RPM
Power Output
Cooling Type
Value
Single Turbine, 10 stage condensing
3600 rpm
50MWe
TEWAC
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Missile Protection • Missile protection addressed in Section 3.5
- All essential equipment located inside the reactor or control buildings
- Barrier approach taken per RG 1.115 to credit reactor and control building walls as a missile barrier.
- No missile generation probability analysis or rotor integrity program credited
- Overspeed protection system similar in design to industry standard
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Turbine Bypass • Turbine bypass system
- Capable of supplying 100°/o rated power steam flow to main condenser
- Minimized potential for main steam release or reactor trip on load rejection
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10.3 Main Steam System • Main Steam System
- Delivers steam from steam generators to:
• Turbine generator
• Gland seal regulator
• Directly to condenser through bypass valve
- Provides means of dissipating residual and sensible heat generated by module during hot standby and cooldown operations by bypassing turbine to main condenser
- Transports extraction steam from turbine to feedwater heaters
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10.3 Main Steam System • Main Steam System Boundary
Removable Spool Pieces MSSVs
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Seismic
Secondary Main Steam Isolation
Valves
111 Seismic Anchor Located at Exit
From RXB
v-ABS
Aux Steam Header•---.-
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MSS ...+-+TGS
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10.3 Main Steam System • Secondary steam isolations provided as backup to MSIVs
- Nonsafety-related
- Credited as backup protection for the safety-related isolations
- Periodically tested per the lnservice Testing Program
- Included within Technical Specifications
• Main Steam and Feedwater isolation valves are part of the containment system addressed in Chapter 6
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10.4 Other Features • Condensate and feedwater system (CFWS)
- Supplies FW at necessary temperature, pressure, and chemistry to steam generator
- Consists of:
• Main Condenser
• Condensate storage tank
• Three feedwater pumps (2x 50°10 capacity, 1 on standby)
• Three condensate pumps (2x 50°10 capacity, 1 on standby)
• Three feedwater heaters (high, intermediate, and low-pressure)
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• Feedwater regulating and check valves
• Condensate polishing subsystem
• Feedwater treatment subsystem
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10.4 Other Features • Condensate and Feedwater System Boundary
Removable Spool Pieces
Feed water Regulating Valves
CNTS ..L CFWS
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MSS
--+ CFWS
Heater
-,- 1 FromHP t Herr CFWS
TG
t Feedwater Pumps Gland
Steam Condenser
+ CFWS
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Condensate Polisher
Skids
Condensate Pumps
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10.4 Other Features • Feedwater Regulating Valves (FWRV) and Backup
Feedwater Check Valves
- Nonsafety-related
- Credited as backup protection for the safety-related isolations
- Periodically tested per the lnservice Testing Program
- Included within Technical Specifications
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10.4 Other Features • Feedwater treatment and condensate polishing
- Full flow condensate polishing
- All volatile chemistry (amine to control pH, oxygen scavenger to control dissolved oxygen)
- Controls erosion and corrosion of CFWS components by monitoring and maintaining pH and dissolved oxygen levels
- Chemistry program based on current revision of the EPRI PWR Secondary Water Chemistry Guidelines and NEI 97-06 (Steam Generator Program)
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10.4 Other Features • Circulating water system (CWS)
- Provides cooling water to main condenser
- Two identical circulating water systems, each providing cooling
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water to six main condensers
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10.4 Other Features • Auxiliary boiler system (ABS)
- Supplies steam to systems when main steam is not available or not preferred
- High-pressure feeds module heatup system during startup
- Low-pressure feeds turbine gland seals, main condenser for
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deaeration, and condensate polishing regeneration system
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Ch. 10 COL Items Item No.
10.3-1
10.3-2
10.4-1
10.4-2
10.4-3
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Description of COL Info Item
A COL applicant that references the NuScale Power Plant design certification will provide a site-specific chemistry control program based on the latest revision of the Electric Power Research Institute Pressurized Water Reactor Secondary Water Chemistry Guidelines and Nuclear Energy Institute (NEI) 97-06 at the time of the COL application.
A COL Applicant that references the Nu Scale Power Plant design certification will provide a description of the flow-accelerated corrosion monitoring program for the steam and power conversion systems based on Generic Letter 89-08 and the latest revision of the Electric Power Research Institute NSAC-202L at the time of the COL application.
A COL applicant that references the NuScale Power Plant design certification will determine the size and number of new and spent resin tanks in the condensate polishing system.
A COL applicant that references the NuScale Power Plant design certification will describe the type of fuel supply for the auxiliary boilers.
A COL applicant that references the NuScale Power Plant design certification will provide a secondary water chemistry analysis. This analysis will show that the size, materials, and capacity of the feedwater treatment system equipment and components satisfies the water quality requirements of the secondary water chemistry program described in Section 10.3.5, and that it is compatible with the chemicals used.
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Open Items Item# Summary Description
8.3-1 Related to requested exemption from GDC/PDC 34, "Residual Heat Removal ," with respect to the system function of transferring residual and sensible heat from the reactor coolant system.
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Confirmatory Items (Cl) RAI
Question#
10.03.06-5
10.03.06-6
10.03.06-7
10.04.06-7
Conference Call
Conference Call
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NRC Cl
10.3.6-1 10.3.6-3
None
10.3.6-2
None
10.4.7-1
10.4.11-1
Summary Description
Request to re-include text related to the FAC program into COL Item 10.3-2 and Section 10.3.6.3. The DCA was revised as requested .
Request to revise FSAR Tier 2, Section 10.3.6 to only discuss the nonsafety related portions of the steam and power conversion systems. The DCA was revised as requested.
Request to revise the DCD to include justification describing how the NuScale SG program meets NEI 97-6 and EPRI SG management program guidance. The DCA was revised as requested.
Request to explicitly include EPRI Action Levels for secondary water chemistry into COL Item 10.3-1. NuScale considered the COL item adequate as written .
Request to include additional discussion on the role of maintenance and operating procedures on minimizing the occurrence of water hammer. The DCA was revised as requested.
Request to remove Table 10.4-22 and specify that tanks are constructed of corrosion resistant materials compatible with chemicals used. The DCA was revised as requested .
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RAls • Unresolved Closed Question#
10.02-1
10.02-2
10.02.03-1
10.02.03-2
Summary Description
TGS - turbine overspeed trip setpoint, single failure criteria and protection against common cause failures
TGS - overspeed trip system diversity, defense-in-depth, trip logic, common components and impact of component failures
Request for ITAAC related to turbine rotor integrity/turbine missiles
Request for COL item related to a turbine inspection and testing program
• Waiting for Response/Supplemental Question# Summary Description
10.04.07-3 Request for COL item to provide operating and maintenance procedures to address water hammer issues for the CFWS
10.02-3 TGS - two independent diverse emergency overspeed protection trip systems
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Portland Office 6650 SW Redwood Lane, Suite 210 Portland, OR 97224 971.371.1592
Corvallis Office 1100 NE Circle Blvd., Suite 200 Corvallis, OR 97330 541 . 360. 0500
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London Office 1st Floor Portland House Bressenden Place London SW1E 5BH United Kingdom +44 (0) 2079 321700
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NUSCALE™ Powe r for a ll humankind
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Backup Slides
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Heat Balance Figure 10.1-2: Flow Diagram and Heat Balance Diagram at Rated Power for Steam and Power Conversion System Cycle
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