After several months of spewing radiation all over northern Japan, Tokyo Electric Power Company is finally going to use boric acid on one of the Fukushima Daiichi reactors.

Actually TEPCo is pouring a borci acid/water mix into the spent fuel pool above Reactor 3.  By Monday evening, 27 June 2011, they will have used 90 tons of the mixture.

What is happening in the fuel pool is that radioactive concrete debris, from the hydrogen explosions, were stored in the fuel pool.  TEPCo has discovered that calcium hydrate from the concrete debris has made the water highly corrosive, increasing the chances of structural failure of the fuel pool.  They fear the racks holding the spent fuel rods will collapse, causing the rods to crash into each other, thus causing “re-criticality”.