| 摘要 |
PROBLEM TO BE SOLVED: To provide a vibration measurement method for an instrument of a boiling-water reactor that realizes easy identification of reflection echo from a measurement object when using an ultrasonic wave to monitor a vibration state of an instrument in the boiling-water reactor.SOLUTION: A target portion of vibration measurement of a jet pump 109 as an instrument in a boiling-water reactor is provided with an ultrasonic reflector 301 that is formed with multiple ultrasonic reflective planes. An ultrasonic transmission and receiving part 303 uses an ultrasonic sensor 302 installed outside the reactor to transmit an ultrasonic wave to the ultrasonic reflector 301 and to receive each reflective wave generated on the ultrasonic reflective plane. A signal processing part 305 sequentially records the reflective waves, calculates each hourly travel distance of the reflective waves recorded sequentially, and measures a vibration state at the target portion of vibration measurement from the hourly travel distance of the reflective waves. |
