Nuclear engineering harnesses the energy released when heavy atomic nuclei split apart. A single kilogram of uranium-235 contains as much energy as 2,700 tonnes of coal — but controlling that energy requires mastering neutron physics, materials science, thermal hydraulics, and radiation protection simultaneously. The margin between a safe reactor and a dangerous one is measured in fractions of a percent of reactivity.
These simulations model the fundamental physics that govern every nuclear reactor. Track the neutron multiplication factor that determines criticality. Watch fuel isotopes evolve over years of irradiation. Solve the diffusion equation to see how neutron flux distributes through a reactor core. Calculate the decay heat that persists for years after shutdown. Design shielding that attenuates gamma rays and neutrons to safe levels.