Active neutron counting software for nuclear material verification with the neutron collar and the active well coincidence counter

The Uranium Neutron Coincidence Collar (UNCL) is used by the International Atomic Energy Agency (IAEA) to verify the Uranium 235 and Uranium 238 content in Light Water Reactor (LWR) fuel assemblies. The IAEA uses also Active Neutron Coincidence Counter (AWCC) for the verification of the Uranium 235 content in uranium samples and MTR fuel assemblies. This paper describes the Active Neutron Counting System (ANCS). The application software is considered to be user-friendly and can lead inspectors through the measurement steps and provide final evaluation in the field and at the IAEA. The software is based on the functional specification prepared by the IAEA and reviewed by the Los Alamos National Laboratory. The algorithms were provided by the IAEA in consultation with LANL