ALTERNATIVE MEASUREMENT DEVICE, ALTERNATIVE MEASUREMENT SYSTEM, AND ALTERNATIVE MEASUREMENT METHOD

摘要

PROBLEM TO BE SOLVED: To provide an alternative measurement device, an alternative measurement system, and an alternative measurement method, which allow alternative measurement using another monitoring indicator even when one monitoring indicator cannot be measured.SOLUTION: In an alternative measurement device 9a, when a temperature measurement device 8 converts detection signals output from plural thermometers 6 disposed in a nuclear reactor containment vessel 1 into temperature measurement value data, a data obtainment part 91 obtains the pieces of temperature measurement value data, and a data threshold determination part 92 categorizes the obtained temperature measurement value data by temperature thresholds. A water-level conversion part 93 calculates a water-level conversion value on the basis of the category and a water-level conversion table 94 and outputs the water-level conversion value to a comparison display device.