Method for imaging a nuclear reactor

A computer-implemented method for imaging a portion of a nuclear reactor module that comprises a tubesheet within a containment vessel that is positioned between an emitter and a detector of an imaging device, where the tubesheet of the nuclear reactor module is filled with a tracing agent that comprises an energy absorbing fluid, the method comprising:

• transmitting, at a first time, energy by the emitter toward the containment vessel and the tubesheet;
• receiving, at the detector, at least a portion of the energy transmitted by the emitter, the at least a portion of the energy comprising a first amount of energy attenuated by the tracing agent and a second amount of energy scattered by the tubesheet of the nuclear reactor module within the containment vessel;
• and
• creating a computer-generated model of the first tubesheet based on the at least a portion of the energy received at the detector, the computer-generated model comprising one or more 3D images of the tubesheet.