I don't see this becoming a massive problem. The Japanese will work regardless if it costs their lives (recalling Kamakazi pilots) until the problem is as SAFE AS THEY CAN GET IT.
Priority is the power lines, which have reached the plant already. These will be connected soon and the pumps will work, ensuring enough water to cool the reactors down. Radioactive Cesium and Iodine will continue to leak, but as is clear by now, the radiation from these dissipates quickly. If the pumps do not work as planned, they will continue with the helicopters and fire rescue and military trucks until they get it working.
I don't get the public reaction. Why is America so afraid? Japan is facing the biggest disaster since World War II and all bloody America cares is about bloody America, blaming and accusing the Japanese of every stupid thing they can think about.
This is like a well fed family man walking past a neighbor, who is trapped under a tree, and freaking out that the dying man will infect him. Why not help the dying man and stop accusing him of walking past the tree?
I wish I was the supplier of radiation medication in America. I would like to have that market.