关键词: CFETR, 氦冷偏滤器, RELAP代码, Ex-vessel LOCA, In-vessel LOCA

Abstract:  Based on the conceptual design of the CFETR helium cooled divertor loop, the calculation model of accident is established, and the Ex-vessel LOCA accident and both In-vessel & Ex-vessel LOCA accidents are simulated to evaluate consequences of the radioactive leakage. The results show that: In Ex-vessel LOCA accident, the pressure of the room in which the pipes are located rises in a small margin due to the leakage of the helium coolant, and the helium leakage is underneath the acceptable value; During the both Ex-vessel & In-vessel LOCA accidents, the gas would flow reversely from the room to the vacuum vessel while the isolation valves are not considered. While the isolation valves are added, the leakage to both the room and the vacuum vessel meets the acceptance criteria. In the meantime, the tritium leakage at the accident operating mode is estimated based on the calculation results. The results verify the safety of the preliminary design and provide data for following design process.

Key words: CFETR, 氦冷偏滤器, RELAP代码, Ex-vessel LOCA, In-vessel LOCA