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HTGR Hydrogen and Heat Application Resarch Center

Aiming at Practical Application of Safe and Environment-friendly Nuclear Reactor with Meltdown-proof design.

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The accident in the Fukushima-Daiichi Nuclear Power Station caused people in Japan to waver in their confidence on nuclear reactor. In order to reassure people and to regain their confidence, it is necessary to develop nuclear reactor which is heled in safety state even if any situation is considered. In such a situation, High Temperature Gas-cooled Reactor (HTGR) which possesses inherent safety and can be used for a wide range of heat applications attracted people's attention, and in the 'Strategic Energy Plan' which was decided to approve by the Cabinet on April 11, 2014, it is specified that the Government of Japan facilitates research and development of HTGR under international cooperation as a nuclear technology which has prospective industrial application such as hydrogen production and will contribute for advancing safety.

Furthermore, in the 'Growth Strategy 2017' which were approved by the Cabinet on June 9, 2017, From the viewpoint of improving the safety, reducing the volume of radioactive waste, reducing the level of harmfulness, etc., the government will advance research and development for the future, by utilizing the test research reactors that include high-temperature gas reactors, while properly advancing international cooperation. At the same time, the government will steadily work on the human resource development, etc. in such fields.

The countries all over the world, such as USA, China and Korea facilitate research and development of HTGR. Japan Atomic Energy Agency (JAEA) is leading the world in the field of research and development of HTGR due to the researches on operation tests utilizing High Temperature engineering Test Reactor (HTTR). In the 2010 fiscal year, JAEA performed Loss of Forced cooling test  begun at reactor power 30% by utilizing HTTR, acquired the data which is necessary to formulate the policy for safety design of HTGR. Moreover, Fundamental technologies, which are indispensable to the next-generation HTGR, such as analysis codes for nuclear reactor, advanced heat-resistant fuel, long lived graphite and so on have been developed and advanced.


Structure of High Temperature engineering Test Reactor (HTTR)



*      Graphite moderated and Helium gas-cooled high temperature reactor with 30MW reactor thermal power.

*      Due to the core constructed of fuel particl coated by four-multiple ultrathin ceramics layers and graphite core componet, meltdown-proof design is available.



In the field of research for water splitting hydrogen production process driven with HTGR heat, reflecting the accumulated technologies of corrosion resistant equipment such as Fluoroplastic-coated Bunsen reactor, ceramic-made sulfuric acid decomposer and so on, JAEA had constructed Hydrogen Production Test Facility made of industrial materials such as alloy in the 2013 fiscal year, ceramic and so on, and begins operation test for verification of each reaction characteristics.




Appearance of Hydrogen Production test facility


Considering the policy of the Government of Japan which was described in the Strategic Energy Plan and Growth Strategy 2017, JAEA is planning to design HTTR integration test with heat application system on the Third Middle-Long Term Plan which started in 2015 fiscal year. In the test, JAEA will contribute early commercialization of HTGR heat application system by integrating HTTR with heat application system such as hydrogen production facility and gas turbine power generation facility and verifying the performance.


*        Policies of HTGR Development in Japan

*        Recent Topics of HTTR Project


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