The document discusses a presentation on neutron flux and reactor power. It defines neutron flux as the number of neutrons crossing an area per unit time. It provides the formula to calculate neutron flux using neutron density and velocity. Neutron flux is usually measured using excore neutron detectors. Reactor power is defined as the energy released per fission multiplied by the number of fissions per second. The formulas to calculate reactor power using neutron flux, atomic density, and cross section are also provided. There are three types of reactor power: nuclear power, thermal power, and electrical power. Criticality and multiplication factor are also discussed, where criticality is defined as a factor of 1 and supercritical/subcritical systems have factors above/below