Modelling the Transport of Corrosion Products and Radionuclides in the CANDU Primary Heat Transport System

Abstract

An accurate prediction of FAC in a typical CANDU-6 is important for determining radiation fields around components. The current model calculates FAC rates and the transport of non-radioactive and irradiated corrosion products around the primary side. One EFPY of operation is simulated for low- and high- chromium carbon steel. Predictions of corrosion rates in the feeders and deposit accumulation are in good agreement with plant measurements. Activities of ⁵⁹Fe, ⁵⁵Fe, ⁵⁸Co, and ⁶³Ni are obtained from the predicted deposit mass per unit area. On-going work involves modelling surface activity levels resulting from ⁵⁴Mn, ⁶⁵Zn, ⁵¹Cr, and ⁶⁰Co transport.