| 摘要 |
PROBLEM TO BE SOLVED: To provide a nuclear reactor power measuring device capable of reducing the number of sensitiveness calibrations of a GT sensor while suppressing an error of sensitiveness of the GT sensor within a tolerance range. SOLUTION: This device is provided with gamma ray thermometers 31a to 31i outputting signals corresponding to the temperature change of metal due to gamma rays generated inside a nuclear reactor 2, means 5 and 13a for determining reactor power on the basis of the signals outputted by the gamma ray thermometers 31a to 31i and a sensitiveness of the gamma ray thermometers 31a to 31i, a calibrating means 9 calibrating the sensitiveness of the gamma ray thermometers 31a to 31i, and a means 20 for predicting a future value of the sensitiveness of the gamma ray thermometers 31a to 31i.
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