Modeling of Corrosion Product Activity in Primary Circuits of Pressurized Water Reactors pp. 139-162
Authors: (Nasir M. Mirza, Sikander M. Mirza, Department of Physics & Applied Mathematics, Pakistan Institute of Engineering and Applied Sciences, Nilore, Islamabad Pakistan)
Abstract: The corrosion product activity is widely recognized dominant source of elevated radiation levels in the primary circuits of PWRs which results in prolongation of maintenance schedules, entailing substantial economic repercussions. The isotopes of manganese, iron, sodium, molybdenum and cobalt have been identified as the main contributors toward corrosion product activity. Dividing the primary circuits into a one-dimensional set of nodes, static as well kinetic models have been developed for the assessment of various key factors that can be used for limiting the corrosion product activity in these systems. These models are composed of various essential processes including deposition, resolution, and removal by filters and by radioactive decay. The governing set of equations has been implemented in the CPAIR-RC computer code. The impact of plant aging been incorporated in these models in terms of linearly and non-linearly rising corrosion rates.