> The passive (gravity fed) cooling system on the first reactor to melt had it's valve's almost closed when they lost power. Seems like a bad design to even hav

> The passive (gravity fed) cooling system on the first reactor to melt had it's valve's almost closed when they lost power. Seems like a bad design to even have valves on it but I'm not a Nuclear Engineer. It wasn't a great design. But that's what happens when you take reactors that were built before Chernobyl, were optimized for producing material suitable for nuclear bombs instead of safety, and then run them long past their designed lifespan. More or less, these reactors should have been retired long ago, and replaced with more modern designs.