Criticality warning device and criticality warning method

摘要

PROBLEM TO BE SOLVED: To provide a criticality alarm device capable of monitoring criticality and confirming soundness of an alarm signal line.SOLUTION: The criticality alarm device includes: three detectors 1 for detecting radiation and outputting a radiation intensity signal indicating the intensity of the radiation; three 2/3 logic units 2 for outputting a 2/3 logic establishment signal when at least two of radiation intensity signals reach a specific value or higher; an alarm generation unit 5 provided with two lines having 2/3 logic determination part units 11 and 12 respectively, each of which has two 2/3 logic determination parts 10 for inputting the 2/3 logic establishment signal and outputting a 2/3 logic determination signal when the 2/3 logic is established within a specified timed, which outputs a criticality alarm signal when the 2/3 logic determination signals are output from both the two 2/3 logic determination parts 10 of each line; and an on-site alarm generation device units 6 and 7 for issuing an alarm when the alarm signals are output.SELECTED DRAWING: Figure 1