Nondestructive evaluation method of neutron irradiation embrittlement in reactor pressure vessel steel and its apparatus

摘要

The nondestructive evaluation apparatus for neutron irradiation embrittlement according to the present invention is characterized in that a part of a BN probe yoke for detecting BN on the surface of an object to be inspected, an electromagnet coiled on a yoke-type ferrite and a magnet for generating a sinusoidal wave A signal generator, a Gauss meter for measuring the intensity of an external magnetic field generated by the electromagnet, an amplifier and a filter for amplifying and filtering the signal detected from the electromagnet and the BN probe coil, and a digital memory An oscilloscope, and a computer for analyzing and evaluating the BN signal data from the oscilloscope.