Apparently not - while the fuel there caught fire, the core material did not melt and escape the containment as a miolten blob. https://en.m.wikipedia.org/wiki

Apparently not - while the fuel there caught fire, the core material did not melt and escape the containment as a miolten blob. https://en.m.wikipedia.org/wiki/Windscale_fire#Use_of_water https://en.m.wikipedia.org/wiki/Windscale_fire#Use_of_water