Since authors have forgotten to it, i have taken the liberty of updating these plugins to IC 1.23.
Havent changed anything, just recompiled for latest version of IC.
CustomNuclearItems and IridiumPack of course.
Oh, just btw, if someone is equally lazy as me and doesn't ever read Readme.txt,
i haved also attached current recipe for iriduim heat converter.
Haven't done any extensive testing, should work fine however.
Just drop into mods folder.