| 摘要 |
PROBLEM TO BE SOLVED: To provide a reactor output measuring device capable of low in cost and high in reliability. SOLUTION: Gamma ray detectors 4a to 4k for measuring heat generation quantity of metal due toγ-ray generated in a reactor, a computer calculating reactor power based on the output signal from theγ-ray detectors 4a to 4k, a heater for heating theγ-ray detectors 4a to 4k, a power source 133 for supplying power to the heater for heating, and a calibration means 123 for calibrating the sensitivity of theγ-ray detectors 4a to 4k, during the heating by the heater are provided and the power source 133 is arranged in a central control room.
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