Patent ID: 8798225
Filing Date: 2014-08-05
Classification: G21C,G21D,G21F,Y02E

Abstract:
1. A radiation exposure reduction method comprising: injecting iron into a coolant as a feed water which flows from the reactor cooling system to the reactor core in a nuclear power plant in a plant operation to thereby ferritize and fix radionuclides or parent nuclides thereof, which are contained in the coolant, on the surface of a reactor core structure, wherein a soluble organic iron is used as the iron to be injected into the coolant, wherein a quantity of the iron to be injected into the coolant is controlled such that an iron concentration in the coolant at the time of feeding the feed water is 0.05 to 0.5 ppb, and wherein a point where the soluble organic iron is injected into the coolant is set at a reactor recirculation system or a discharge side of a feeder pump of a feed water system.