I've just gotta add
this link to this thread ... it contains a short video on how the MMRTG was assembled by the very people who did it ! (Scroll down to the bottom of the page).
Once constructed, they are confident enough about its safety that you can see them manoeveuring the unit around whilst wearing nothing more than t-shirts ! Now, that's a pretty relaxed outlook while one is standing a couple of feet away from a nuclear power source !
This is what I mean about how our instinctive fears about the nuclear power supplies are very likely to be quite irrationally based. It would seem the INL folk might see it all this way, eh ?
Cheers