Safety and environment assessment of ARIES-AT

ARIES-AT is a 1000 MWe conceptual fusion power plant design with a very low projected cost of electricity. The design contains many innovative feature s to improve both the physics and engineering performance of the system. Fr om the safety and environmental perspective, there is greater depth to the overall analysis than in past ARIES studies. For ARIES-AT, the overall spec trum of off-normal events to be examined has been broadened. They include c onventional loss of coolant and loss of flow events, an ex-vessel loss of c oolant, and in-vessel off-normal events that mobilize in-vessel inventories (e.g. tritium and tokamak dust) and bypass primary confinement such as a L oss of Vacuum and an in-vessel loss of coolant with bypass. This broader ex amination of accidents improves the robustness of the design from the safet y perspective and gives additional confidence that the facility can meet th e no-evacuation requirement. We also provide a systematic assessment of the design to address key safety functions such as confinement, decay heat rem oval, and chemical energy control. In the area of waste management, waste i s classified by both the volume of the component and its hazard. In compari son to previous ARIES designs, the overall waste volume is less because of the compact design.