Dissolution Behavior of Nickel and Nickel Oxide Particles in Simulated PWR Reactor Coolant at Temperatures below 100°C

摘要

The dissolution behavior of nickel and nickel oxides at 30°C and 90°C was investigated by both thermodynamic calculations and experiments in a batch laboratory set-up.The calculations and the experiments were carried out at reducing as well as oxidizing conditions;the presence of B/Li as standard in primary cycles of pressurized water reactors was taken into account.The objective of the investigations was the optimization of shutdown and start-up conditions with the aim of removing nickel and its activated product ~(58)Co from the primary coolant system.As a result of the investigations conducted,two options for the optimization of nuclear power plant operation are presented.