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Could the hydrogen and other radioactive gasses at Fukushima have been vented prior to the hydrogen air explosions that cause damaged to the reactor buildings and containment systems? This is how Three Mile Island was saved, but because Three Mile Island still had station power it was able to use burner devices to flare most of the gas before release. Because Fukushima was suffering a station blackout it had no power to operate the burners. Neither Three Mile Island nor Fukushima had passive auto-catalytic hydrogen recombiners (standard in Europe as a result of Three Mile Island and Fukushima) which would have allowed for the safe venting of the hydrogen gas without power.
If the reactors suffered a hydrogen explosion (as they ultimately did) then any radioactive gasses would release anyways, but could a release of the unfiltered gas at Fukushima have prevented the explosions and turned Fukushima into more of a bad Windscale Fire Incident instead of the much more severe incident it did become?