Thermal-Dynamic Research of Hydrogen Thermal-Siphon Circulation for Cold Neutron Source in China Advanced Research Reactor

A new cooling scheme on moderator cell for Cold Neutron Source（CNS）in China Advanced Research Reactor（CARR）is brought forward,which is considered to resolve the thermal-dynamic difficulty of CARR CNS such as the high heat flux from cell wall to liquid hydrogen owing to high nuclear power of CARR and low enrichment of Uranium,the special operation model of off-CNS while reactor is on.The simplified model is founded from the cooling scheme and the calculation program is compiled.Then,the capacity of heat exchanging is calculated.The equation,which implies the self-regulation characteristics of CARR CNS,is derived and established.The self-regulation analysis has been carded out for CARR CNS by analysis of this equation.The result shows that this cooling scheme could overcome the difficulties in high heat flux and operation model of CARR CNS,and is endowed with self-regulation characteristics.