There are some other sources of neutrons, chiefly (a,n) reactions on light elements (Li, Be, F, etc.). The alphas coming from actinide decay. Very much like a Pu238Be neutron source. Not sure if that dose rate is troublesome for electronics.Lars wrote:Neutrons should fade away within 10 - 20 minutes after the fuel is removed from the core. No problem with waiting that long. In fact, the particular application I'm thinking of would have a 4 year cool down period. So I'm thinking we are not in a high LET field.
The stator would never have to be in high temp if cooling systems work. The rotor, that depends. Canned rotor type pumps are the most hermetic pumps with no need for seal gas or mechanical seals. Unfortunately they place the rotor in the product to be pumped, that means for MSRs it would have to operate hot.I see no reason the motors themselves should be in a high temp environment. The fuel salt needs high temp for some steps but the motor can be placed a bit away and the fuel salt insulated.