Research on Quality of Helium Gas in Primary System of 10 MW High-Temperature Gas-Cooling Reactor

The primary coolant of 10 MW High-Temperature Gas-Cooling Reactor is helium gas which contains 7 types of impurities affecting the quality of the coolant. These impurities include H2O, CO2, H2, CO, CH4, N2 and O2. By analyzing quality variation of helium gas for the reactor working on different conditions, the following conclusions were draw. At first, after being purified by the helium purification system, the helium gas can meet the quality requirements of the technical specifications during the power operating of the reactor. Secondly, the helium gas’s quality decreases when the temperature of the helium gas in the primary system increases. Finally, water is the source item for the slowly changing of impurities.