> In interviews, U.S. and West European officials said that some of the graphite reactors like the four at Chernobyl may be used to produce weapons-grade plutonium, but that their most likely military purpose is to make tritium, a rare isotope of hydrogen used in thermonuclear weapons.
https://en.wikipedia.org/wiki/Chernobyl_disaster
> the Chernobyl Nuclear Power Plant, near the now-abandoned town of Pripyat, in northern Soviet Ukraine.
Weapons:
https://www.latimes.com/archives/la-xpm-1986-10-03-mn-4176-s...
> In interviews, U.S. and West European officials said that some of the graphite reactors like the four at Chernobyl may be used to produce weapons-grade plutonium, but that their most likely military purpose is to make tritium, a rare isotope of hydrogen used in thermonuclear weapons.