SYSTEM FOR DIAGNOSING LIFETIME OF NEUTRON DETECTOR

摘要

PPROBLEM TO BE SOLVED: To precisely and appropriately carry out diagnosis of lifetime about the changes in the detection sensitivity of a neutron detector, in a system for diagnosing the lifetime of the neutron detector, in order to optimize the updating of the neutron detector, with respect to the periodical inspection span of an electric power plant, and to reduce the cost. PSOLUTION: A mean-square voltage MSV of the neutron detector 1 is measured with a measuring circuit 4, and the lifetime of the neutron detector 1 is evaluated by a neutron detector lifetime evaluating device 7, based on the measured data of the measuring circuit 4; and a detector-updating scheduled inspection span of the electric power plant is determined from the lifetime of the neutron detector 1, obtained by the neutron detector lifetime evaluating device 7 and from periodical inspection plan data of the electric power plant produced by a power plant scheduled inspection planning device 9. PCOPYRIGHT: (C)2006,JPO&NCIPI