more intensive maintenance and inspections because you can't assume that you know everything that's going on with these aging processes. so but of course the more inspections that you do the more expensive it gets. so there's a constant struggle between, you know, how much you actually have to search for things that you don't necessarily know will be there. and so it's this struggle that's one of the major problems that we worry about with regard to aging plants. how do you discover things that you really don't expect before they cause a major problem? >> aging seems to be one of the issues that was relevant in the idaho plutonium exposure case as well. they're describing a container for some spent nuclear fuel that may have been corroded. 16 people there potentially exposed to plutonium. how scary a situation is that? can you put that into in-some context for us? >> well, the larger context is that the department of energy oversees a complex of