The passivation effects of magnesium ion on phwr primary heat transfer system structural materials

Abstract

Zinc ion injection passivation technique is being used in BWRs in order to reduce the radiation field build-up around the reactor coolant system. In the case of PWRs and PHWRs, the chemistry of the primary coolant system and the materials of construction are different from those of BWRs. In the present paper, the results of studies on the effect of magnesium ion in modifying the oxide layers formed under PHWR chemistry conditions are reported. The experiments carried out at room temperature and at 265°C are described. Electron spectroscopy for chemical analysis (ESCA) of the materials autoclaved at 265°C in magnesium containing solution has also been reported. © 1996 Taylor and Francis Group, LLC.