Doc. No. A1-2023-000393
Export Control No. PSNN-2023-1017

The Workshop on Innovative Nuclear Energy Systems

Innovative Nuclear Energy Systems Resilient to NaturalDisasters-Development of Toshiba's innovative Reactor-Kazuhito ASANO
Toshiba Energy Systems & Solutions Corporation
26th January 2024
© 2024 Toshiba Energy Systems & Solutions Corporation

Toshiba Next Generation BWR：iBR◼ Safety Concept: No Need for Emergency Evacuation➢ No Containment Venting even in Sever Accident with High Confidence◼ Grace Period: 7 days

➢ Double Cylindrical Containment Vessel, Passive Safety Features◼ Experienced Construction Method➢ Based on ABWR Construction Experiences◼ High Economical Efficiency➢ Containment Vessel designed against Aircraft Impact
may change the design of the Emergency Countermeasure
Building

Innovative Safety Reactor can Coexist with Local
Community and Provide Excellent Economical Efficiency© 2024 Toshiba Energy Systems & Solutions Corporation2

iBR Passive safety system
Passive safetysystem: iPCCS
Cooling S/C

Trap FP in outer
well via InContainment
Filtered Venting
SystemPassive safety system:
Ultra Condenser
Cooling RPViB1350

iCC+melting valve:
Autonomous cooling ofmelted debris

Ref.ICONE26-82428

Autonomous cooling of the core and containment vessel during severe accident※iPCCS: innovative Passive Containment Cooling System、 IC: Isolation Condenser、 iCC: innovative Core Catcher、© 2024 Toshiba Energy Systems & Solutions Corporation

3

HTGR Heat Storage System■ Various heat utilization- Hydrogen production, desalination, industrial heat source, etc.

■ Load Following (Flexibly)

Reactor Cavity
CoolingSystem(RCCS)✓ Heat storage system with the advantageof high temperature process heatConfinementHeatHigh temperatureexchanger heat storage tank✓ Flexible response to renewable energy
output fluctuations✓ Already performed in solar thermal power
generation system

Heat storage tank(Molten Salt)
Steam generatorReactor
Steam turbine
Low temperature
heat storage tank

Support ‘harmony with hydrogen society’ and ‘contribution to various
demand’ with inherent safety© 2024 Toshiba Energy Systems & Solutions Corporation4

HTGR (High Temperature Gas Reactor)◼ Early commercialization based on the experience of HTTR construction◼ Inherent Safety and Passive Safety✓ No fuel melting✓ No need for immediate action at accident✓ No chemical reaction with fuels (No hydrogen/vaporexplosion)✓ Decay Heat Removal System by Natural Circulation◼ High Temperature Gas (>750℃✓ High potential for multi purpose use

Bird's-eye view of a 1,000MWe-class steam turbine power plant
Composed of four reactors, including heat storage system

Establish 1,000MWe class HTGR concept with 4 module© 2024 Toshiba Energy Systems & Solutions Corporation5

SummaryToshiba promotes development of innovative reactors to meet social needs◼ iBR
Responding to large-scale power demand as a next-generation large LWR with improved safety andeconomic efficiency◼ High Temperature Gas Reactor
Responding to the needs of medium-scale power sources, incorporating the benefits of hightemperature and inherent safety.
Pursuing the added value of nuclear power, including the coexistence with renewable energy thatutilizes the ability to load following system© 2024 Toshiba Energy Systems & Solutions Corporation6