High Temperature Engineering Test Reactor (HTTR)is the first and only one high-temperature gas-cooled reactor in Japan. The first criticality of the HTTR was achieved on November 10,1998. The reactor outlet coolant temperature of 950°C under full thermal power of 30MW was achieved on April 19, 2004 for the first time in the world. From January to March in 2010, HTTR was operated successfully for 50 days under high temperature and full power conditions.
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