I don't believe that would've helped in the case of Fukushima because of the hydrogen explosions that would've expelled radioactive dust. I'm not a nuclear eng

I don't believe that would've helped in the case of Fukushima because of the hydrogen explosions that would've expelled radioactive dust. I'm not a nuclear engineer but it seems to me that we should try to find an alternative material to zirconium. It can decompose water into hydrogen gas. It's why hydrogen built up inside Fukushima Daiichi and it's suspected that's why Chernobyl Reactor 4 had two explosions, one of them being hydrogen. Alternatively, we could try to circulate another liquid through reactors which won't decompose into hydrogen, possibly something with a higher thermal capacity too, but that might be expensive.