Reproduction method of filter demineralizer in condensate cleanup system of reactor

A method of reproduction of a filter demineralizer for cleanup of a condensate flowing into a nuclear reactor from a turbine, which method comprises the steps of

• backwashing the filter demineralizer to separate therefrom powdered ion-exchange resin contaminated with crud;
• storing backwash including the separated powdered ion-exchange resin in a tank;
• recirculating the backwash in a course including the tank and a crud removal apparatus thereby removing the crud from the powdered ion-exchange resin to reproduce the powdered ion-exchange resin;
• extracting a part of the backwash recirculating while adjusting the quantity of the backwash extracted;
• adding new powdered ion-exchange resin;
• precoating the new powdered ion-exchange resin to form a new powdered ion-exchange layer on the filter demineralizer;
• and
• depositing the reproduced powdered ion-exchange resin in the extracted backwash on the new powdered ion-exchange resin layer to form a reproduced powdered ion-exchange resin layer on the filter demineralizer;
• the amount of new powdered ion-exchange resin precoated being nearly equal to the reproduced powdered ion-exchange resin by weight.