that level would clearly force operators and workers to stay out of that area. at least if it's at some meaningful level that we can measure and stay away from and/or limit the time that workers are in there, we can continue to work on the power plant, which is very important, as you know. >> tom, i want to ask you about the significance of it. this is confusing for a lot of people. can you explain why it's so significant and how toxic it could be? this is the primary concern, that a real leak of this sort exists. is it? >> yeah, it is a concern. keep in mind that the reactor is contained -- the core of the rearchitect, the fuel, which we know is contained in all three units is contained in a reactor