MONITORING-CONTROLLING EQUIPMENT OF BOILING WATER REACTOR

PROBLEM TO BE SOLVED: To provide a monitoring-controlling equipment for a boiling water reactor which can monitor a starting point of boiling in a channel relating directly to the output distribution and thermal hydraulic unstableness of a core and can prevent occurrence of a regional oscillation. SOLUTION: The distance of each fuel assembly from the central axis of a core is calculated by a radius calculating part 11 on the basis of the information on positions of fuel assemblies sent from a process computer 10, and based on an output of the fuel assembly sent from the process computer 10 and on the distance sent from the radius calculating part 11, an RL calculating part 12 calculates a core radial output distribution index (RL), at which the value of a fuel assembly output in the peripheral region of the core becomes large in the case where this output is large relatively. A judging part 13 outputs an alarm to a main control room at the time when the core radial output distribution index exceeds a predetermined set value.