NOISE SUPPRESSION DEVICE AND PLANT INCLUDING THE SAME

摘要

PROBLEM TO BE SOLVED: To provide a noise suppression device capable of suppressing noise in a further wide frequency range.

SOLUTION: A neutron detector 3A in a reactor core is connected to a neutron monitoring device 11A through a signal cable 4A. A motor 15 of an internal pump installed in an RPV 1 is connected to a motor control device 14 including an inverter through a power cable 12. This noise suppression device 20 includes a current detector 22 surrounding the power cable 12, a current injector 25, and a noise suppression control device 21 having a frequency characteristic compensation circuit 23. A calculation device of the frequency characteristic compensation circuit 23 calculates a value of a current injected to the power cable 12 from the current injector 25 for negating a noise current based on a voltage signal from the current detector 22 having detected the noise current of the power cable 12. A voltage compensation circuit compensates and outputs a voltage signal input based on the current value. The compensated voltage signal is amplified and thereafter input to the current injector 25.

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