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Sakaba, Nariaki
no journal, ,
The Japan Atomic Energy Agency (JAEA) has been developing High Temperature Gas-cooled Reactor technology since 1960s. In December 2020, Japanese Government clearly stated "Green Growth Strategy Through Achieving Carbon Neutrality in 2050" that noted a commitment to the milestone and developing and implementing significant efforts in various sectors for achieving carbon neutrality around 2050. High Temperature Gas-cooled Reactor (HTGR) is expected to play one of a dominant roles to reduce carbon generated from non-electric fields by utilizing heat and hydrogen produced by HTGR. To produce hydrogen from HTGR, it is necessary to establish a connecting technology including safety case between HTGR and hydrogen production process. The milestone for hydrogen production by HTTR (High Temperature Engineering Test Reactor) is given by the Green Growth Strategy. JAEA is now planning its R&D towards generation of hydrogen using heat from HTTR by 2030. This paper describes current status of HTGR R&D in JAEA.
Shibata, Taiju
no journal, ,
HTGR can provide high temperature which is used for non-electric application such as H
production, process heat, desalination, etc. as well as for power generation. JAEA resumed the HTTR in 2021 without major reinforcements due to its inherent safety features. A safety demonstration test simulating loss of core cooling was carried out in 2022. HTGR is expected to be a promising system to attain carbon neutrality. A new project was launched to demonstrate H production by using the HTTR. R&D on nuclear and renewable hybrid energy system is underway toward carbon neutral society. Safe, sustainable and flexible use of nuclear are studied.
Maekawa, Fujio
no journal, ,
One of the promising applications of high-intensity accelerators is nuclear transmutation by using accelerator-driven systems (ADS). The ADS is a system consisting of an accelerator and a subcritical nuclear reactor core. A charged particle beam accelerated by the accelerator is injected into the subcritical core to operate the core continuously at a constant power. Harmful elements, especially highly toxic minor actinides (Np, Am, Cm), are partitioned from high-level radioactive waste generated in nuclear power plants. Those elements are loaded in the subcritical core, and transmuted in short-lived or stable nuclides by operating the ADS. Accordingly, the ADS can efficiently reduce the toxicity and volume of high-level radioactive waste. Developing nuclear transmutation technology will provide a powerful means of solving the problem of nuclear waste, which will greatly contribute to the promotion of the use of nuclear energy and eventually the achievement of carbon neutrality. This talk will touch on what is the ADS and the current status of the ADS development.