American subs use Highly enriched 90%+ uranium metal fuel rods, as opposed to power plants which use low enriched uranium oxide. They use this kind of fuel

American subs use Highly enriched 90%+ uranium metal fuel rods, as opposed to power plants which use low enriched uranium oxide. They use this kind of fuel so they can fit enough in the reactor for twenty plus years of power. Does anyone know what kind of fuel russian subs use?