Paul Lorenzini CEO, NuScale Power Platts Conference Small Modular Reactors June 28, 2010

Transcription

1 NuScale Power: The Evolution of SMRs Paul Lorenzini CEO, NuScale Power Platts Conference Small Modular Reactors June 28, 2010

2 The nuclear renaissance Nuclear power attitudes Market fundamentals 80% 70% 60% 50% 40% 30% 20% 10% Non-carbon base load needed for sustainable climate change Performance of existing plants exceeding 90% capacity factor Streamlined regulation Standardized designs 0% Favor Oppose 2

3 SMRs: An old idea comes to life 3 Green Tech Media names Modular Nuclear Power Number 1 on its list of Top Ten High Concepts for 2009

4 New York Times, Dec

5 Why Small Modular Reactors? Reduced financial risks Eliminates global choke points and stimulates domestic manufacturing capabilities Simplicity enhances safety and reduces costs Small, modular plants can reach multiple markets New capacity can be added to match load growth 5

6 Secretary Chu Endorses SMRs in WSJ America's New Nuclear Option Small modular reactors will expand the ways we use atomic power. By Steven Chu Wall Street Journal, March 23, 2010 If we are serious about cutting carbon pollution then nuclear power must be part of the solution. Countries such as China, South Korea and India have recognized this and are making investments in nuclear power that are driving demand for nuclear technologies. Our choice is clear: Develop these technologies today or import them tomorrow. As this paper recently reported, one of the most promising areas is small modular reactors (SMRs). 6 6

7 NuScale: A Next Evolution in LWR Design NuScale: Prefabricated, Simple, Safe, Reduced Financial Risk NSSS is Factory Built: Entire NSSS prefabricated and shipped by rail, truck or barge PRVs H H H FEEDWATER H STEAM H Turbine Bypass M FW PUMPS TURBINE CONDENSER COOLERS Condensate Polishers OFF-THE- SHELF Natural Circulation Cooling: Inherently safe Eliminates major accident scenarios Improves economics - Eliminates pumps, pipes, valves Large natural heat sink Simplifies and enhances safety case Proven Technology Reactor Recirc Valves Below Ground Enhances security and safety 7

8 NuScale: A Next Evolution in LWR Design NSSS and Containment Containment Reactor Vessel Helical Coil Steam Generator Containment Trunnion Nuclear Core 8

9 Factory manufacturing and modular construction lowers costs GDEB has significantly increased use of modularity over last 30 years. 1 hour to accomplish task in shop environment 8 hours to accomplish task at final stages of fabrication effort Conventional top loading Early OHIO cylinder Early SEAWOLF cylinder VIRGINIA 95% Modular 9 SEAWOLF fully outfitted cylinder 3 hours to accomplish task in temporary environment

10 Factory Manufacturing reduces construction risks NSSS construction taken offsite Eliminates field work Improves productivity Changes on-site project from nuclear plant construction to more conventional power plant build 10

11 Domestic manufacturers 11

12 NuScale: A Next Evolution in LWR Design Plug and play Each module has dedicated Steam-Turbine Generator Generator Steam Turbine Condenser Water-Filled Pool Below Ground Containment NSSS J. Nylander and M. Cohen 12

13 Modularity permits scaling to any size 12 modules, 45 MWe each produces 540 MWe 13

14 Capacity added to match load growth Incremental Build out Initial installation 270 MWe Cooling Towers Turbine Building and 6 Turbine Generators Reactor Building Sized for 12 modules with 6 modules installed 14

15 Incremental Build Out Incremental build out minimizes financial risk, matches demand growth Final Installment (540 MWe) Initial installment (270 MWe) Cooling Towers Cooling Towers Turbine Building and 6 Turbine Generators 12 Power Modules Turbine Building and 6 Turbine Generators GSU Transformers 6 Power Modules Final Installment 15

16 NuScale design evolutions Factory manufacturing moves construction offsite to a controlled manufacturing environment Modularity Reduces financial challenges Economics validated Reduces size and permits domestic manufacturing Capacity can be added to match load growth Single shaft risk eliminated In-line refueling improves availability Simple, natural circulation Eliminates systems and components Enhances safety 16

17 Validated safety case strengthens licensing Safety case validated and design informed by PRA and independent PIRT panel reviews June 2008: Thermal Hydraulic and Neutronics PIRT Panel Review 17 Large-break Loss of Cooling Accident (LOCA) eliminated by design Small break design basis LOCA s will not uncover the core, thus do not challenge plant safety Feb 2009: Severe Accident PIRT Panel Review PRA is overly conservative with regard to events that lead to core damage. Level I Probabilistic Risk Assessment (PRA) already validates extremely low overall Core Damage Frequency

18 Integral test facility provides R&D base One - third scale integral test facility confirms design and safety analysis Integral test facility provides R&D support required for NRC Certification without the need for a prototype NuScale s approach replicates Certification of the AP1000 using an integral test facility also built by Oregon State University 18

19 Evolving the containment design High Pressure Containment Advantages Pressure Capability - Equilibrium pressure between reactor and containment following any LOCA is always below containment design pressure Insulating Vacuum Significantly reduces convection heat transfer during normal operation No insulation on reactor vessel. ELIMINATES SUMP SCREEN BLOCKAGE ISSUE (GSI-191) Improves steam condensation by eliminating air Prevents combustible hydrogen mixture in the unlikely event of a severe accident (i.e., little or no oxygen) Eliminates corrosion and humidity problems inside containment 19

20 Decay Heat Removal Using the Containment Reactor Vessel steam is vented through the reactor vent valves (flow limiter) Steam condenses on containment Condensate collects in lower containment region Reactor Recirculation Valves open to provide recirculation path through the core Provides +30 day cooling followed by indefinite period of air cooling. Reactor Recirculation Valves 20

21 Heat Transfer Area per Volume (1/m) Internal Pressure (bars) NuScale Containment Compact Passively Cooled Containment Heat transfer surface area to volume increases with decreasing containment diameter Total A/V Pressure (bar) Maximum Internal Pressure capability increases with decreasing containment diameter Inside Diameter (m) 21

22 Nu NuScale Containment Compact Passively Cooled Containment For a fixed wall thickness and containment length: Heat transfer coefficient increases with decreasing containment diameter 2.5E E E+04 External Surface Nusselt Number 1.0E E E Containment Inside Diameter (m) 22

23 NuScale Source Term Mitigation Additional Fission Product Barriers Fuel Pellet and Cladding Reactor Vessel Containment Containment Cooling Pool Water Containment Pool Structure Biological Shield Reactor Building 23 Low CDF, Increased Fission Product Barriers, Small Source term means potential for smaller EPZ

24 NuScale design evolutions summarized Factory manufacturing moves construction offsite to a controlled manufacturing environment Modularity Reduces financial challenges Economics validated Reduces size and permits domestic manufacturing Capacity can be added to match load growth Single shaft risk eliminated In-line refueling improves availability Simple, natural circulation Eliminates systems and components Enhances safety A new approach for plant containment 24

25 Costs validated by Kiewit Power Constructors $10 billion annual revenue with 125 year history and 25,000 Employees FORTUNE s most admired company in the engineering and construction industry in EPC contracts completed since 1994 Major commitment to new nuclear projects based on past nuclear construction experience Kiewit Corporate Headquarters Omaha, NE 25

26 Customer Advisory Board Company Company Representative Michael Sellman, Chair Mid-American Omaha Public Power District ENTERGY Energy Northwest Southern California Edison Exelon Saskatchewan Power Ameren Bill Fehrman, President Dave Bannister, Chief Nuclear Officer Donna Jacobs, Vice President Jack Baker, Vice President Ross Ridenoure, Sr. Vice President, Chief Nuclear Officer Marilyn Cray, Vice President, Nuclear Project Development John MacKenzie Adam Heflin, Chief Nuclear Officer 26

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