Bummer that it doesn’t specify which application of nuclear power, but seeing as in forced to guess, I’d surmise they’re using RTG.

Radioisotope Thermoelectric Generator

The spicy rocks get hot and the differential between the hot bit and the cold exterior (and titan is VERY COLD INDEED) “pushes” electrons, to put it as simply as possible.

IF SO, it’s pretty normal for the most part; we’ve been using RTGs for generations.