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Would you expect them to solve the problems just by spraying water? Apparently they can't get it inside reactors anyway.
by das monde on Fri Apr 1st, 2011 at 06:11:36 AM EST
[ Parent ]
Depends on which problem you mean. Spraying water is irrelevant to the reactor cores, they are now pumping freshwater across pipes to cool those. For the cooling of the spent fuel ponds, spraying water does solve the problem, but a permanent way of pumping water across a heat exchanger would be desirable eventually, and of course a cover overhead, but first the wreckage would have to be removed for anything stable. I'm not sure what problem concrete would be supposed to solve – maybe it would block aerial fallout, but that only if cooling efforts are abandoned (both in the spent fuel pools and reactor cores) and all steam is let off first, but then you have complete meltdowns and a bigger problem underneath the reactor.

*Lunatic*, n.
One whose delusions are out of fashion.
by DoDo on Fri Apr 1st, 2011 at 06:20:53 AM EST
[ Parent ]
Do we know that the pools' structure hasn't been damaged so that water leaks out through cracks? Those explosions have been quite spectacular.

Economics is politics by other means
by Migeru (migeru at eurotrib dot com) on Fri Apr 1st, 2011 at 06:21:54 AM EST
[ Parent ]
Do we know that the pools' structure hasn't been damaged so that water leaks out through cracks?

No we don't. (We don't know how far the pool was re-filled, either.) However, we calculated that the No. 4 spent fuel pond heats at least at 2°C/h when not boiling and evaporates at 3.7 tons an hour when boiling, that's 88.8 t per day. The amounts pumped into the No. 4 reactor's spent fuel pool (see here) were 125-150 t at a time, the last time 140 t two days after the previous filling. That is in the right ballpark if you take the re-heating of water cooled by the previous addition into account.

*Lunatic*, n.
One whose delusions are out of fashion.

by DoDo on Fri Apr 1st, 2011 at 06:34:21 AM EST
[ Parent ]

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