Optimal Resin Operation In Primary System Demineralizers At Ikata Nuclear Power Station

摘要

Ikata Nuclear Power Station with Pressurized Water Reactors has optimized resin operation in primary system demineralizers and got good results such as further purification of primary water, reduction of resin waste due to longer resin service life, control of radiation dose. The outlines are as follows. Adoption of high cross-linkage cation resin with higher oxidative resistance prolong resin service life longer, so that we have firstly introduced 16% cross-linkage cation resin to Spent Fuel Pit Demineralizer (Ikata Unit 3) in 2002, subsequently to CVCS Mixed Bed Demineralizer, Boric Acid Evaporator Package Mixed Bed Demineralizer and so on. Together with adoption of 16% cross-linkage cation resin, some demineralizers changed filling resin type and its ratio for further prolongation of resin service life. On the other hand, it was also found in primary system that anion resin crack depends on boron concentration. We have investigated crack dependence on boron concentration and introduced crack resistance anion resin with high boron concentration in 2008.