I guess the took my advice from this blurb from Bloomberg news:
Fifteen engineers were able to return to the nuclear plant site after the April 7 quake. They continue to pump nitrogen into one of the reactors, part of an effort to prevent hydrogen explosions at the plant, Tokyo Electric said.
From my many years of haz mat work it is common practice to pump either nitrogen or CO2 gas into a tank first for cleaning. That renders any explosive gas or vapor inert. We are then able to cut into the tank for access without fear of explosion. In this case they are using it to prevent a hydrogen explosion. The problem though is that anyone working near the reactor will have to be wearing a supplied air system meaning they can only work for around 30 minutes at a time before coming out for a new tank of air. That's a tricky proposition when you have to decontaminate for radiation every time you need air. Those fully encapsulating suits they wear aren't cheap. A low end model for some chemicals runs $600. And as was stated before they were running out of everything including boot covers.
Funny how our really old models of nuclear reactors were much safer in that the fuel rods were attached to ropes. The ropes were routed up to a control room and held in a bundle with a large ax overhead. If the reactor were to start running away then a technician would literally grab the ax cut the rope causing the fuel rods to fall into their graphite holders stopping the reaction. This was know as S.C.R.A.M. safety control rod ax man.