Its been almost 2 weeks now and the Japanese are dilly-dallying around on the nuclear crisis. They need to entomb the reactors in concrete ASAP. If something isn’t done quickly much of Japan north of Tokyo might be inhabitable for a long time to come.
It’s a disgrace. Back in the day there’d be a lot of Seppuku going on.
Several reactors are above 300 degrees C. Surrounding them with concrete would not assist cooling them down.
Keeping the reactor vessels exposed allows continued cooling lowering the chance of the remaining fuel from melting down.