Purification method for purifying water in a spent fuel pool in a nuclear power plant

Abstract

A purification method for spent fuel pool water from nuclear power generation, the method comprising: passing the water at a linear flow velocity of 50 m/h or less through a purification apparatus for the water comprising an ion exchange resin layer and a metal-doped resin layer which is laid at a bed height of 2 cm or more on a surface layer of the ion exchange resin layer wherein the water to be treated is contacted with the metal-doped resin layer to decompose a pro-oxidant contained in the water; and subsequently contacting the water with the ion exchange resin.

What is claimed is: 
     
         1 . A purification apparatus for water in a spent fuel pool in a nuclear power plant, comprising:
 a spent fuel pool containing a spent fuel from a nuclear power plant and water;   an ion exchange resin layer having an inlet side and an outlet side;   a metal-doped resin layer laid at a bed height of from about 2 cm or more to about 10 cm or less on the surface of the inlet side of the ion exchange resin layer; and   a delivery line configured to deliver the water from the spent fuel pool to the metal-doped resin layer.   
     
     
         2 . The purification apparatus according to  claim 1  further comprising a spent fuel pool water circulation line configured to return the water from the ion exchange layer to the spent fuel pool. 
     
     
         3 . The purification apparatus according to  claim 1 , wherein the water from the spent fuel pool comprises peroxide, and wherein 90% or more of the peroxide is decomposed by passing the water through the metal-doped resin layer and the ion exchange resin layer. 
     
     
         4 . The purification apparatus according to  claim 1 , wherein the metal in the metal-doped resin layer is selected from the group consisting of fine particles of palladium, platinum, manganese, iron, and titanium. 
     
     
         5 . The purification apparatus according to  claim 1 , wherein the water from the spent fuel pool further comprises a hydroperoxyl radical, a hydroxyl radial, or combination thereof. 
     
     
         6 . The purification apparatus according to  claim 1 , wherein the delivery line is further configured to deliver the water so that the water passes through the ion exchange resin layer at a linear flow velocity of from 30 m/h or more to about 50 m/h or less during operation.