Abstract: Disclosed herein is a method for constructing a pseudo hot pin power distribution using in-core detector signal-based planar radial peaking factors in a Core Operating Limit Supervisory System (COLSS). The method includes defining a planar radial peaking factor FxyK based on in-core detector signals in the COLSS, and expanding the planar radial peaking factor FxyK so that the planar radial peaking factor FxyK is suitable for a number of nodes of the COLSS. The planar radial peaking factor FxyK is calculated only for the in-core detector signals using a preset equation, rather than by using table lookup.

Abstract: Disclosed is a method of measuring radioactive material of an ingot, in which an ingot having a volume produced by subjecting metal waste generated in nuclear fuel processing or production facilities to melting decontamination undergoes gamma spectroscopy using a HPGe detector to measure gamma rays of U-235 (185.72 key, 57.2%) among uranium isotopes, followed by performing detector calibration using a certified reference material and self-absorption correction depending on the density of a medium using MCNP computer code, and which enables rapid determination of whether the ingot subjected to melting decontamination may be self-disposed of or not.