[caf]

I would be interseted to hear which US/Russian treaty involved verification of plutonium production reactors or naval reactors. I'm not aware of any such.

(There are plans for a Fissile Material Cutoff Treaty, but discussion has on that has been indefinitely stalled in the Conference on Disarmament by Pakistan).

[scotje]

I had to do some Googling, but the PPRA treaty would appear to explain the valve cover inspections: http://dtirp.dtra.mil/tic/synopses/ppra.aspx

Still looking for what would apply to the Navy reactors.

[caf]

That's great to read, thanks! I imagine the experience earned on verifying the PPRA will be valuable when a verification mechanism for the FMCT is designed.

[scotje]

Well, I haven't found a specific treaty or agreement covering the Naval reactors. It may be a less formal arrangement, I don't know.

But a did find a nice picture of the reactor pit: http://3.bp.blogspot.com/-jYVl__lRp5s/Tfpf4Cyi6rI/AAAAAAAAA6...