Operation, test, research and development of the High Temperature Engineering Test Reactor (HTTR) (FY2007)

Department of HTTR

The High Temperature Engineering Test Reactor (HTTR) constructed at the Oarai Research and Development Center of the Japan Atomic Energy Agency (JAEA) is the first high-temperature gas-cooled reactor (HTGR) in Japan. The HTTR is a graphite-moderated and helium gas-cooled reactor with 30 MW of thermal power. In fiscal year 2007, we have carried out long-term (30 days) operation to accumulate operational data for HTGR developments. Periodical inspections, exchange of filter of primary gas circulators and in-service inspection of the reactor pressure vessel were also conducted, and manufacturing of control rod for exchange was started. This report summarizes activities and results of HTTR operation, maintenance, and several R&Ds, which were carried out in the fiscal year 2007.