It strikes me that the primary safety vulnerability of current nuclear reactors is the pipes that can rupture, and the pumps that can fail. Isnt it time to come up with a simpler design that doesnt need all these systems external to the core itself. Why can we have a larger scale version of a Radioisotope Generator that uses a Beta Stirling engine to convert heat to rotary motion. This would also eliminate the turbine stage. http://en.wikipedia.org/wiki/Advanced_Stirling_Radioisotope_Generator Instead of using Plutonium-238 why not use conventional fuel rods housed inside an iridium-titanium core that is surrounded not by water but by HELIUM contained in an insulated piston cylinder?