Radiation exposure reduction method
AssigneeKabushiki Kaisha Toshiba
InventorsYumi Yaita, Seiji Yamamoto, Hajime Hirasawa, Yutaka Uruma
Life of this patent
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Abstract
A radiation exposure reduction method includes the steps of: injecting iron into a coolant which flows from the reactor cooling system to the reactor core in a nuclear power plant; and ferritizing and fixing radionuclides or parent nuclides thereof, which are contained in the coolant, on the surface of a reactor core structure, wherein an iron citrate which is soluble organic iron, or iron oxalate or iron fumarate which has a particle diameter of 3 μm or less, is used as the iron to be injected into the coolant.
Claims6
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.
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 an organic iron which has a particle diameter of 3 μm or less, is used as the iron to be injected into the coolant,
- wherein an 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 injects the soluble organic iron into the coolant is set at a reactor recirculation system or a discharge side of a feeder pump of a feed water system.
Dependencies are inferred from the claim text.