Evolution of SBWR

Design Approch

• Shift from active to passive devices
• Eliminate and/or simplify system
  • Improved operation and maintenance
  • Potential for reduced regulatory involvement
• Utilize ABWR technology

SBWR Unique Features

• Natural circulation
  • Eliminates recirculation system
• Isolation condenser
  • Passive decay heat removal/inventory control
• Gravity driven core cooling
  • Eliminates many ECC systems
• Accumulator driven Boron injection
  • Diverse passive reactivity shutdown
• Raised suppression pool
  • Assures long-term core coverage
• Enhanced Control Rod Drive system
  • More high pressure delivery backup
• Increased cleanup heat exchanger size
  • Provides high pressure shutdown cooling
  • Eliminates several systems/components
• Elimination of Safety-grade AC power dependence
• Multi-compartment Reactor Building
  • Minimizes safety envelope
  • Enhances retention of post-accident fission products
• Simplified turbine island