Research and application of an in-service chemical decontamination process for high temperature and high pressure circuit

Abstract

Here we present a newly developed two-step oxidative-reductive in-service chemical decontamination process suitable for high temperature and high pressure circuit (HTHPC) decontamination in a pressurized water reactor (PWR). Various process parameters on the corrosion depth and decontamination factor were investigated by employing different kinds of detergents. Under optimal conditions, the average decontamination factor is about 60.0 and the maximum corrosion depth is 0.20 um. Actual decontamination by applying this process to HTHPC, the dose field in most locations decreased by more than 89% and it’s proved that the decontamination process is completely suitable for the decontamination of PWRs in service.