ZINC INJECTION METHOD AND ZINC INJECTION DEVICE

摘要

PROBLEM TO BE SOLVED: To provide a zinc injection method capable of further increasing zinc ion concentration of an aqueous solution of carbonic acid containing zinc ion to be injected into a reactor pressure vessel.SOLUTION: A zinc injection device 1 having a carbonic acid gas dissolution tank 4 and a closed loop containing a zinc dissolution tank 2 filled with zinc oxide pellets 3 is used for injection of zinc into water supply piping 36. An aqueous solution of carbonic acid 24 generated in the carbonic acid gas dissolution tank 4 due to discharge of a carbonic acid gas from an air diffuser tube 5 is supplied to the zinc dissolution tank 2 by a circulation pump 6. Zinc contained in the zinc oxide pellets 3 in the zinc dissolution tank 2 is dissolved by the aqueous solution of carbonic acid 24. The aqueous solution of carbonic acid 24, which contains zinc ion generated from dissolution, is led into the carbonic acid gas dissolution tank 4. Zinc ion concentration of the aqueous solution of carbonic acid 24 circulating within the closed loop is further increased. The aqueous solution of carbonic acid 24 which circulates within the closed loop and contains the zinc ion is injected by zinc injection piping 21 from the carbonic acid gas dissolution tank 4 to the water supply piping 36.