Design of a stainless-steel helium-cooled first-wall for a tokamak reactor blanket

This report summarizes the results of the thermal and hydraulic analysis on a magnetic fusion power reactor first-wall design that will be tolerant to minor coolant leaks. The design uses stainless steel as a structural material, liquid lithium as a heat conduction and tritium breeding material, and high pressure helium as a coolant. Bubbles of helium from minor leaks float to the surface of the liquid lithium where the gas is pumped off by a vacuum pump. The wall design is capable of absorbing heat flux densities up to 1.0 MW/m2 with the first-wall temperature not exceeding 4500C and the helium pumping power not exceeding 5% of the first wall thermal output. The performance characteristic curves which are developed provide a good basis for comparing first-wall designs