Electric nuclear reactor parts aren't loaded properly for me. Relevant part of log:
[LOG 12:04:35.609] PartLoader: Compiling Part 'SterlingSystems/Electrics/Nuclear/KRUSTY/strl-rctrkrusty'
[ERR 12:04:35.610] PartCompiler: Cannot clone model 'SterlingSystems/Electric/Nuclear/KRUSTY' as model does not exist
[ERR 12:04:35.610] PartCompiler: Model was not compiled correctly
[ERR 12:04:35.610] PartCompiler: Cannot compile model
[ERR 12:04:35.610] PartCompiler: Cannot compile part
[LOG 12:04:35.610] PartLoader: Compiling Part 'SterlingSystems/Electrics/Nuclear/SCM/strl-rctrscm'
[ERR 12:04:35.611] PartCompiler: Cannot clone model 'SterlingSystems/Electric/Nuclear/SCM' as model does not exist
[ERR 12:04:35.611] PartCompiler: Model was not compiled correctly
[ERR 12:04:35.611] PartCompiler: Cannot compile model
[ERR 12:04:35.611] PartCompiler: Cannot compile part
I think the problem is that the model paths in the cfg files contain typos; should be Electrics instead of Electric.