Analytical Study for Development of Cold Trap Design Technology

In a Sodium-cooled Fast Reactor (SFR), liquid sodium is subject to the formation of impurities by its high chemical reactivity with so many elements and common compounds used in nuclear reactor construction materials. The impurities are mainly in the form of hydrides, oxides, metallic compounds, metallic and carbon particles, which originate primarily from steam generator corrosion, moisture from system component surface, and leakage of air into the system. These are finally deposited in the form of the crystallization of sodium hydride (NaH) or sodium oxide (Na2O) at the cold points of the circuit, which may lead to the clogging of the narrowed sections or may damage the pump. Therefore, it is important to research purifying performance of a cold trap. Up to now, many studies for cold traps have been accomplished but the studies for their performance are still under execution