Estimation of subcriticality and fuel concentration by using 'pattern matching' of neutron flux distribution under non uniformed system

摘要

Recent development of positon sensitive neutron detector such as PSPC(Helium-3 Position Sensitive Proportional Counter~`) enabled us to measure spatial neutron flux distribution very rapidly~2. (Fig.1) Especially, the PSPC working together with LN9000 multi parameter s ystem, which is a product of Laboratory Equipment Corporation, enables us to measure both neutron flux distribution and time-sequential data of neutron detection signals, simultaneously~3.