Nuclear reactor instrumentation and servicing arrangement

Claim 1

A FAST NUCLEAR REACTOR COMPRISING A VESSEL, A CORE HAVING FUELLED COOLANT FLOW CHANNELS WITH THEIR OUTLETS AT ONE END OF THE CORE, STRUCTURE FOR SUPPORTING THE CORE WITHIN THE VESSEL, A CARRIER STRUCTURE SPACED FROM THE AFOREMENTIONED END AND ROTATABLE AS A SINGLE MASS ABOUT AN AXIS SUBSTANTIALLY COINCIDENT WITH THAT OF THE CORE, INSTRUMENTATION COLUMNS BEARING INSTRUMENTATION COMPRISING AT LEAST TEMPERATURE MEASURING MEANS, SAID COLUMNS BEING MOUNTED IN A PARALLEL ARRANGEMENT ON THE CARRIER STRUCTURE TO PROJECT THEREFROM TOWARDS THE AFOREMENTIONED END OF THE CORE FOR REGISTERING THE INSTRUMENTATION UNATTACHEDLY WITH RESPECTIVE COOLANT CHANNEL OUTLETS IN AN OPERATING POSITION OF THE CARRIER STRUCTURE, AND A FUEL HANDLING MEANS FOR GAINING ACCESS TO FUEL IN THE COOLANT FLOW CHANNELS THROUGH A CLEAR PATH DEFINED BY AND EXTENDING RADIALLY BETWEEN THE INSTRUMENTATION COLUMNS, WHEREBY SAID CLEAR PATH IN CONJUNCTION WITH THE ROTATIONAL CAPABILITY OF SAID CARRIER STRUCTURE ALLOWS ACCESS BY THE FUEL HANDLING MEANS TO ANY POSITION IN THE CORE.