I mean... I usually belong to the anti-nuclear crowd, but even I don't think that would be an issue. From what I know, one of the iron rules of nuclear plant

I mean... I usually belong to the anti-nuclear crowd, but even I don't think that would be an issue. From what I know, one of the iron rules of nuclear plant design is that the contaminated stuff never leaves the reactor building. Even the steam circuit that powers the generator is separated from the (contaminated) primary circuit and receives energy through a heat exchanger [1]. The lines for district heating would probably be separated from the primary circuit by several of those. [1] https://en.wikipedia.org/wiki/Heat_exchanger https://en.wikipedia.org/wiki/Heat_exchanger