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The Japan Atomic Energy Agency (JAEA) has resumed operation of the High-Temperature Test Reactor (HTTR) in Oarai, Ibaraki Prefecture. The small prototype reactor becomes the first Japanese gas-cooled reactor to restart following the introduction of new safety regulations.
The HTTR reactor (Image: JAEA)
The 30 MWt graphite-moderated helium gas-cooled reactor achieved first criticality in November 1998 and reached full power operation in 2001. It demonstrated stable heat at 950°C over 50 days in 2010. Its fuel is ceramic-coated particles with low-enriched (average 6%) uranium incorporated into hexagonal graphite prisms, giving it a high level of inherent safety. It is designed to establish a basis for the commercialisation of second-generation helium-cooled plants running at high temperatures for either industrial applications or to drive direct cycle gas turbines. JAEA plans to construct a hydrogen production system linked to the HTTR, which had been idle since February 2011
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