R&D on High-Temperature Gas-cooled Reactor and Hydrogen Application Technology

What is High Temperature Gas-cooled Reactor (HTGR) ?

What is High Temperature Gas-cooled Reactor (HTGR) ?

  • Helium gas cooled reactor with outlet coolant temperature of 950ºC.
  • 80% of reactor thermal power can be utilized by a cascade energy system for hydrogen production, power generation and desalination.

What is High Temperature Gas-cooled Reactor (HTGR) ?

Superior inherent safety

Superior inherent safety

Specification of High Temperature engineering Test Reactor (HTTR)

HTTR Reactor building

  • Reactor thermal power: 30MW
  • Reactor coolant:Helium gas
  • Reactor inlet/outlet coolant temperature :395/850, 950℃
  • Reactor core material:Graphite
  • Fuel:UO2

HTTR

Safety demonstration test with HTTR

Test procedures

  • Reactor power 30%(9MW)
  • Tripping all gas circulators to reduce primary coolant flow rate to zero. → No core cooling!
  • No reactor scram operation of reactor (No control rod insertion).→ No core reactivity control!

Test results

Test results

  • Reactor was naturally shut down as soon as the core cooling flow rate had been reduced to zero. (Scram operation is not required.)
  • Reactor was kept stable for hours after the loss of core cooling. (No fuel damage. No escalation into severe accident)

Naturally Safe!

Technology of water splitting hydrogen production –Thermochemical IS process-

Reaction scheme and features

Reaction scheme and features

    Thermal water decomposition:
  • Heat over 4000ºC is required.
    IS Process:
  • Chemical reactions of iodine (I) and sulfur (S) enable water decomposition at about 900ºC.
・I and S re-circulate in the process.
→ No release of harmful chemicals

・HTGR supplies heat energy driving the process.
→ No emission of CO2

Hydrogen production test facility

Hydrogen production test facility

  • Continuous hydrogen production was achieved at the rate of 30 L/h for 150 hours. (January 2019)
  • Purpose:
  • Verification of integrity of total process components made of industrial materials

Hydrogen production test facility

Japan Atomic Energy Agency

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