Safety demonstration tests using high temperature engineering test reactor

Safety demonstration tests using the high temperature engineering test reactor (HTTR) are conducted for demonstrating inherent safety features of high temperature gas-cooled reactors (HTGRs) as well as for providing core and plant transient data for validation of HTGR safety analysis codes. The safety demonstration tests are divided to the first phase and second phase tests. In the first phase tests, simulation tests of anticipated operational occurrences and anticipated transients without scram (ATWS) are conducted. The second phase tests will simulate accidents such as a depressurization accident (loss of coolant accident). The first phase tests simulating reactivity insertion events and coolant flow reduction events started in FY 2002. The first phase safety demonstration tests will continue until FY 2005 and the second phase tests will be carried out from FY 2006.