Westinghouse Small Modular Reactor Development Overview

Transcription

1 Westinghouse Small Modular Reactor Development Overview Small Modular Reactor Development Team Westinghouse Electric Company Dr. Nick Shulyak Presentation to IAEA July 4,

2 SMR Product Specifications Specifications Thermal Output Electrical Output Passive Safety Systems Core Design Reactor Vessel Size Upper Vessel Package Containment Vessel Size Reactor Coolant Pumps Steam Generator Pressurizer Instrumentation and Control 800 MWt > 225 MWe No operator intervention required for 7 days 17 x 17 Robust Fuel Assembly 8.0 ft Active Length < 5% Enriched U Assemblies Soluble Boron and 37 Internal CRDMs 24 Month Refueling Interval Outer Diameter: 11.5 ft Height: 81 ft 280 Tons Outer Diameter: 32 ft Height: 89 ft Fully Modular Construction 8 External, Horizontally-Mounted Pumps Sealless Configuration Recirculating, Once-Through, Straight-Tube Integral to Vessel OVATION -based Digital Control System 2

3 What It Is An integral PWR Innovative packaging of proven components The highest levels of safety with fewer accident scenarios Industry-proven equipment designs Compact reactor coolant system and containment An engineered solution for today s clean energy challenges Simplicity in Design Containment Vessel Pressurizer Steam Generator Core Makeup Tank + Reactor Coolant Pumps Internal Control Rod Drives Reactor Core 3

4 SMR Fuel Design: Proven Features, Ease of Licensing Top Mounted Core Instrumentation Inconel Top Grid RFA2 Mid-Grid Enhanced strength Enhanced fretting margin ZIRLO grid Opt. ZIRLO Cladding IFBA, ZrB 2 Integral Fuel Burnable Absorber WSMR XL Westinghouse Integral Nozzle (WIN) No potential for loose parts One piece casting Skeleton structure Enhanced dimensional stability ZIRLO thimble tubes Thick thimble tubes Tube-in-tube dashpot design Anti-bowing design prevents IRI Intermediate Flow Mixing (IFM) Grids Heat transfer enhancement Structural capability Enhanced outer strap Inconel Bottom Grid Oxide Coated Cladding Stand-off Piece/Bottom Plenum Protective Grid (P-Grid) Low Profile Debris Filter Bottom Nozzle (LP DFBN) Partial-height design incorporating AP1000 technology 4

5 Westinghouse SMR Reactor Vessel Internals Design driven by interfaces Steam generator Coolant pumps Reactor vessel Utilize AP1000 component designs e.g. guide tubes, support plates and columns, flow skirt, vortex suppression, etc. Upper Support Plate Upper Core Plate Lower Support Plate Transition Cone CRDMs Guide Tubes Fuel Core Barrel Secondary Core Support 5

6 Integral CRDM Design Latch assemblies, controls, and interfaces with fuel are all based on existing, proven designs Three-coil magnetic jack based AP1000 design with modifications High-temperature coil winding design Sealed, stainless steel coil stack housing Sealed power conduit with leak detection Test program initiated 6

7 Recirculating Steam Generator Straight-tube steam generator Flow from top to bottom of tubes Hot leg located in center of tube bundle Transfers hot water to the upper tube sheet Main steam and two feedwater piping connections Recirculating steam generator with steam/water mixture delivered to steam drum outside containment Tubesheet Tubes Tube supports Wrapper Steam and Feed Nozzles Hot Leg Transition Cone / Cold Leg 7

8 Containment Wall Westinghouse Non-Proprietary Class 3 Steam Generator and Steam Drum System SG Internals External Steam Drum Distribution Device Tubesheet Steam Nozzle to Turbine Secondary Separators Tubes Tube supports Wrapper Steam and Feed Nozzles Hot Leg Transition Cone / Cold Leg Feedwater Nozzle Primary Separators Sludge Collector Recirculation Nozzle Wet Steam Nozzle 8

9 SMR Reactor Coolant Pumps Eight reactor coolant pumps providing 12,500 gpm at 100 ft of head (no seal injection) Each motor ~350 hp (460 V, 3 phase) Total flow 100,000 gpm Driven with 2 variable frequency drives (VFD) Mount horizontally through pressure boundary below closure flange 9

10 Westinghouse SMR Pressurizer Located at top of reactor vessel Standard electric heater rods Standard spray arrangement Steel barrier between pressurizer and top plenum of steam generator 10

11 SMR Containment Vessel Compact containment High pressure Size 32-ft diameter and approximately 89-ft height Target is to operate containment at vacuum to: Increase heat transfer inside containment Reduce insulation needs Reduce challenge of containment overpressure Water cooled on outside of containment Annulus flooded In vessel retention accomplished by draining tanks of water to flood lower reactor vessel 89 ft 32 11

12 Simplification: Smaller Footprint Evolutionary PWR Size Matters AP

13 How Small is Small? 25 Westinghouse SMR Containment Vessels fit in a single AP1000 Containment Vessel 13

14 SMR Plant Layout Turbine Building Annex Building Grade Maintenance Hall Nuclear Island Above grade Reactor Containment Nuclear Island Below grade 14

15 Underground Structure Containment Core Makeup Tank Spent Fuel Pool Pressurizer Steam Generator Reactor Coolant Pumps Inside Containment Pool Outside Containment Pool CRDM Core 15

16 Structure Overview Maintenance Hall Water tanks HVAC Trains B & D Remote Shutdown & Tech. Support Spent Fuel Pool Demineralizers Waste Holdup Tanks HVAC MCR Control Room Batteries I&C Cabinets Radwaste storage Liquid Radwaste Gas Radwaste 4x Safety Trains 16

17 Advance Passive Safety 100% reliance on natural forces gravity, evaporation, condensation Simplicity is fewer pumps, fewer valves, less cable, less human reliance Already meeting challenges to address post-fukushima issues 17

18 SMR Safety Overview 18

19 Westinghouse SMR: Fukushima-Related Information Events/Threats Earthquakes and Floods Station Blackout (no AC power sources) Westinghouse Small Modular Reactor Response Robust: Designed to withstand general natural disasters: earthquakes, flooding, tsunami, tornados, hurricanes. Features such as watertight doors and below-grade siting are being implemented in the design. Seismic Design: The SMR is designed to withstand an earthquake that would happen once in every 10,000 years. Seismically stability will be considered in siting for the SMR. Seismic isolation is being considered to limit seismic effects on the containment vessel and equipment in the containment. The SMR can be safely shut down and maintained during a station blackout for 7 days. The advanced passive safety features rely on natural forces such as gravity, natural circulation, condensation and convection. Power Sources Redundant safety-related DC batteries support safe shutdown for 72 hours (3 days). Seven days of natural circulation core cooling is provided with no need for any onsite or offsite AC power sources. Spent Fuel makeup is provided from safety related sources for a period of seven days by gravity with no need for on sight or offsite AC power sources. Two redundant, small ancillary diesels are provided to supply essential plant indication to the operator. Ancillary diesels can run for four days with no operator support. Water Sources Two safety related Decay heat Removal Tanks provide decay heat removal and spent fuel makeup for a total period of seven days. After seven days on site water sources and transfer pumps provide for decay heat removal for the core and for the spent fuel indefinitely. 19

20 Westinghouse SMR: Fukushima-Related Information Events/Threats Containment Integrity Spent Fuel Pool Integrity and Cooling Control Room Habitability Westinghouse Small Modular Reactor Response Containment Design: The 1¾ steel containment is a high integrity steel pressure vessel surrounded by a shield building and imbedded below grade for protection from projectiles, including aircraft impact. Hydrogen Management: Battery powered hydrogen igniters & passive hydrogen recombiners prevent explosions Structure: Spent fuel pool is located below grade and contains heavily reinforced concrete structures lined with steel. Makeup Water: Spent fuel will remain covered with gravity flow of water from safety related Decay Heat Removal Tanks for a period of seven days. Robust Building: Designed for protection against seismic events, natural disasters and aircraft impact. Heavily shielded room with a 72-hour air-pressurization system. Control room dose is minimal under adverse scenarios 20

21 Westinghouse s Global Vision Westinghouse will develop and deploy a safe, economic SMR the meet the many needs of existing and new to nuclear customers around the world Working within constraints Land, grid, cooling water, financing, distributed service territory Offering clean energy Offset owner costs for infrastructure development: land, cooling, T&D Generation diversity Operational flexibility Providing project certainty Reduced licensing risk Short-construction durations Cost predictability and certainty A brighter future for nuclear Aging Fossil Plants District Heating Remote Markets Small Grid Markets Desalinization Process Heat 21

22 The Westinghouse SMR Project Certainty for our Customers Reduced Project Size and Duration Factory fabrication of modules with on-site assembly Shortened installation duration 18 months Proven Licensing Experience 3 certified ALWR designs, licensed fuel designs Regulatory requirements understood, multitude of licensed topical reports Strong relationships with NRC Project Implementation Continuous, successful reactor deployment experience Established resources and organization for deployment 22

23 What We re Doing Westinghouse expertise mobilized Dedicated, company-wide development team Support from experienced expert groups Westinghouse Regional Organizations are Coordinating Potential Opportunities with Global Customers and Partners Extending customer relationships to SMR development Testing critical-to-licensing areas of development internal CRDMs The Westinghouse SMR Design Certification Document is on-schedule for NRC submittal in