NUCLEAR CRITICALITY SAFETY MONITORING METHOD, NUCLEAR CRITICALITY SAFETY MONITORING DEVICE, AND NUCLEAR CRITICALITY SAFETY MONITORING PROGRAM

摘要

PPROBLEM TO BE SOLVED: To issue an alarm, even when trans-Pu each kind requiring no alarm to be issued is intermingled, in a nuclear criticality safety monitoring method for monitoring a neutron counting rate, concerning nuclear criticality safety monitoring of a region for storing a material containing a fissile material or a material having a possibility of containing the fissile material. PSOLUTION: In this nuclear criticality safety monitoring method, when the neutron counting rate exceeds a prescribed value, a prompt neutron attenuation constant is determined from a statistical property of a neutron pulse, and the degree of subcriticality is determined from the prompt neutron attenuation constant, the total delayed neutron ratio and a prompt neutron life determined by a general-purpose nuclear calculation code system, and when the degree of subcriticality becomes low, an alarm is issued. PCOPYRIGHT: (C)2005,JPO&NCIPI