Yes, for example Switzerland uses two of their nuclear power plants for district heating [1][2]. China has also started using it for district heating in Haiyang [3].

[1] https://en.wikipedia.org/wiki/Beznau_Nuclear_Power_Plant#Ref...

[2] https://www.world-nuclear.org/information-library/country-pr...

[3] https://www.nucnet.org/news/city-of-haiyang-first-in-country...

Sure

"Russia, Dec 1, 2019 — Unit 1 of the Leningrad 2 nuclear power station in western Russia has been integrated into the heat supply system of the city of Sosnovy Bor"