The primary sodium purification system is part of the primary coolant boundary of China Experimental Fast Reactor (CEFR). During the normal operation, the sodium is pumped from the cold pool of the core to the sodium purification system, then the sodium i The primary sodium purification system is part of the primary coolant boundary of China Experimental Fast Reactor (CEFR). During the normal operation, the sodium is pumped from the cold pool of the core to the sodium purification system, then the sodium i