New Scientist says spent fuel pools at both #3 and #4 reactors at Fukushima I are both overheating.
Japanese authorities are now focusing their attention on preventing the pools that store spent fuel rods at the numbers 3 and 4 reactors from overheating.
Those pools now face a greater than zero possibility of criticality. It is, apparently, greater enough than zero that Tepco is considering adding boric acid to the water it’s spraying to cool the now-totally-dry spent fuel pools, because water is a neutron moderator — and makes it more likely that the spent fuel will reach criticality. Boron, contained in boric acid, absorbs neutrons and prevents criticality. Boron is used in the sheets between spent fuel rods in a spent fuel pool.
By the way, this shit flies in the face of established science. Spent fuel pools don’t go re-critical. They just don’t.
Except these are.
And the rocket surgeons that built these ones put them above the reactors. Above.
Apparently, they cover internet trolling but not GRAVITY at the universities that teach nuclear engineering.
From the BBC’s Richard Black:
The attempt to use helicopters and water cannon to dump seawater on to the Fukushima power station is almost certainly unprecedented in more than half a century of nuclear power.
The water was not destined for the reactors themselves – they are contained within containment systems that are designed to be sealed tight and which appear to be intact, with the possible exception of a crack in a vessel attached to No 3 reactor.
The targets were cooling ponds situated above the reactors, which store fuel rods. The ponds in buildings 3 and 4 – and possibly more – are certainly short of water, possibly completely dry.