Abstract
The JAERI started the HTGR development program in Japan in 1969 so as mainly to construct an experimental reactor for direct heat application. The energy situation, however, has changed remarkably in Japan during the last 20 years, then, the construction of High Temperature Engineering Test Reactor (HTTR) of 30MW in thermal power was decided instead of an experimental HTGR. The HTTR aims at establishing and upgrading the technology basis necessary for an HTGR, serving at the same time as a potential tool for new and innovative basic researches. The budget for the construction of the HTTR was approved by the Government in January 1989 and the JAERI submitted the safety analysis report of the HTTR to the Science and Technology Agency for the safety review by the Government on February, 1989. The safety review by the Nuclear Safety Commission is undergoing. The first reactor criticality is planned to be attained in 1995.
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