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Temperature of heat transfer fluid flowing in latent heat storage medium could be kept near the melting temperature due to the latent heat. Therefore, latent heat storage technology has possibility to be used to reduce thermal load change of heat utilization system connected to HTGR (High Temperature Gas Cooled Reactor), which can improve reliability of the system including the reactor. This paper treated heat transfer characteristics of heat storage annular pipe as a simulation of heat exchanger pipe. Time dependent wall and gas temperatures and radial position of liquid solid boundary were studied by numerical and approximate analysis with thermal conductivity of phase change material (PCM) as a parameter. The analytical results were applied to estimate the possibility of the latent heat storage technique to reduce thermal load change for two heat utilization systems with 10MW connected to HTGR. When temperature difference of 100K from normal operation temperature occurred, a thermal load absorber with volume of about 15m3 can reduce 100K within 5K for three hours, which would be sufficient for operators to recognize the accident and to treat adequately. Therefore, latent heat storage technology has possibility for the application to thermal load absorber.

Absorption of Thermal Load Change of Nuclear Heat Application Systems by the Use of Latent Heat Storage Technology