Patent Number: 
Section: claims

1. A condensate water demineralizer for a power plant, said condensate water demineralizer disposed so as to receive a flow of condensate water, wherein the condensate water demineralizer comprises a mixed bed of a gel type cation exchange resin and a porous type anion exchange resin, said cation exchange resin being selected to substantially reduce degradation of performance, as measured by a mass transfer coefficient, of said anion exchange resin and having a moisture holding capacity of at most 41% or a degree of crosslinkage of at least 12%, wherein said power plant is a boiling water reactor nuclear power plant. 2. The condensate water demineralizer of  claim 1 , wherein the specific surface area of said porous type anion exchange resin is at least 1 m 2 /g. claim 1 3. A condensate water demineralization method for treating condensate water in a power plant, the method comprising: using a condensate water demineralizer disposed so as to receive a flow of condensate water, wherein the condensate water demineralizer comprises a mixed bed of a gel type cation exchange resin and a porous type anion exchange resin, said cation exchange resin being selected to substantially reduce degradation of performance, as measured by a mass transfer coefficient, of said anion exchange resin and having a moisture holding capacity of at most 41% or a degree of crosslinkage of at least 12%, wherein said power plant is a boiling water reactor nuclear power plant. 4. The condensate water demineralization method of  claim 3 , wherein the specific surface area of said porous type anion exchange resin is at least 1 m 2 /g. claim 3