Nuclear engineering is that the branch of engineering concerned with the appliance of breaking down atomic nuclei (fission) or of mixing atomic nuclei (fusion), or with the appliance of other sub-atomic processes supported the principles of atomic physics. within the sub-field of nuclear reaction, it particularly includes the look, interaction, and maintenance of systems and components like nuclear reactors, atomic energy plants, or nuclear weapons. the sector also includes the study of medical and other applications of radiation, particularly radiation, nuclear safety, heat/thermodynamics transport, fuel, or other related technology (e.g., radioactive material disposal) and also the problems of nuclear proliferation. This field also includes chemical engineering and technology likewise.