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.
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