Since thorium reactors are supposed to run by a constant addition of neutrons to get the isotopes that splits faster, they should be able to run at variable levels. That is, from a physics standpoint. From an engineering perspective I think it would require that the setup is constructed to run at variable power with variable flow of everything (things has to balance and such).

So I think it could work as top load, if designed for it.

What is the development status of thorium reactors btw?

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