Investigation of Thermal Limitations in Heat Pipes Using Three Different Working Fluids in a Heat Pipe Reactor

Abstract

Heat pipe reactors are being considered for electricity generation in remote locations because they are small, transportable, cost-effective as well as suitable for mining sites (for mining activities), individual industrial heat and power scenarios, distributed hydrogen generation and integrated energy solutions. However, one of the most important considerations when using heat pipes to cool a reactor is the thermal limits of the heat pipes. If heat is not extracted from the heat pipes, this can lead to a risk of accidents. It is therefore important to create a safe design that has accounted for the thermal limits of heat pipes. In addition, removal of heat from fuel is one of the fundamental safety requirements in the CNSC’s regulatory framework. In this study, the limits of heat pipes in a heat pipe reactor are investigated. Three different working fluids used in heat pipes were selected: potassium, sodium and lithium. The results for these three working fluids are compared. Additionally, the paper discusses the safety analysis challenges associated with heat pipe limitations.