Abstract: A method for determining heat and reflected heat in a thermal image, according to the present invention, comprises the steps of: a) photographing a subject through a thermal imaging camera so as to collect a thermal image of the subject; b) analyzing features according to the thermal image temperature distribution of the thermal image; c) detecting the heat and the reflected heat in the thermal image according to the analysis in step b); and d) displaying, as heat and reflected heat regions in the thermal image, the heat and the reflected heat in the thermal image detected in step c).

Abstract: A vibration measurement error determination method according to an embodiment of the present invention comprises: a vibration data acquisition step for acquiring vibration data by measuring a vibration generated in a structure; a first determination step for determining, on the basis of a preset error data selection rule, whether the vibration data is data generated by a measurement error; a second determination step for using a machine-learning algorithm to determine whether the vibration data is data generated by a measurement error; and a final determination step for determining, on the basis of the results determined in the first determination step and the second determination step, whether the vibration data is data generated by a measurement error.

Abstract: Disclosed herein are a multi-thermocouple in-core instrument assembly and a system and method for monitoring the internal state of a nuclear reactor after a severe accident using the in-core instrument assembly. In accordance with an embodiment of the present invention, a multi-thermocouple in-core instrument assembly includes a signal compensation detector, thermocouples, and a plurality of neutron detectors disposed between a center pipe having a circular section and an external protection pipe, and the thermocouples have temperature-measuring points at different heights.