Abstract
A design study program on the Gas Turbine High Temperature Reactor (GTHTR300) is being carried out in Japan Atomic Energy Research Institute (JAERI). Design of structures, systems and components which have fundamental engineering safety functions, such as shutdown of reactor, maintaining the coolability of reactor, prevention of the release of radioactivity, has progressed in this program. Coolability must be maintained even when a depressurization accident occurs which is the most severe event with loss of cooling function. The passive cooling system by using natural circulation of air was chosen because of simplicity of the system and its low cost. Cooling panels consisting of rectangular ducts were adopted after detail investigation on the capability of heat removal and on the structural integrity under high pressure condition during depressurization accident. This is an original design which is different from cooling panels in High Temperature Engineering Test Reactor (HTTR) of JAERI. Results of design study on performance of heat removal and structural integrity of passive cooling system of the GTHTR300 are described in this paper.
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