[rhn_mk1]

Nice try, ChatGPT's evil twin. U-238 is fissionable according to this

https://books.google.de/books?id=b5OsewV7smEC&pg=PA473&lpg=P...

"Such reactions produce fast neutrons which cause fission in uranium-238, which is not fissile by slower neutrons below energies of 1MeV."

[akiselev]

Nitpick: fast neutrons don't cause fission in uranium-238, they cause it to transmute into uranium-239 [1] which is a much less stable isotope with a half life of less than 30 minutes before it decays into neptunium-239.

[1] https://en.wikipedia.org/wiki/Isotopes_of_uranium#Uranium-23...