Method and apparatus for enhancing removal of corrosion products from a nuclear reactor piping system

摘要

Method and apparatus for enhancing removal of corrosion products from a nuclear reactor piping system. A reagent is supplied into a multi- part reactor piping system to react with the corrosion products therein. The corrosion products dissolve into the reagent to define a contaminated solution. The contaminated solution is brought into contact with an ion exchange resin bed that absorbs the corrosion products from the contaminated solution to define a reagent-containing contaminant- free solution. In this regard, a circulation pump having a predetermined net positive suction head (NPSH) interconnects the system with the resin bed for pumping the contaminated solution from one part of the reactor piping system and into contact with the resin bed and thereafter pumping the contaminant-free solution from the resin bed and to another part of the reactor piping system to remove the corrosion products. Moreover, a gas injector injects a pressurized gas into the reactor system to pressurize the reactor system to a predetermined pressure necessary to maintain the NPSH during transfer of the contaminant-free solution from one part of the piping system to another part of the piping system. During each transfer, the pump brings substantially all contaminated solution into contact with the resin bed as it removes substantially all the corrosion products from the piping system.