Method of operating nuclear plant
First Claim
1. A method of operating a nuclear plant including a pressurized water nuclear reactor, comprising injecting zinc into a coolant present in a primary cooling system of the nuclear reactor to form a oxide film on TT690 material which constitutes an inner surface of a primary cooling-system piping, after construction of the nuclear reactor and during execution of a hot function test, whereinthe zinc is injected when a temperature of the coolant becomes a predetermined temperature which is above the range between 60 and 90 Celsius degrees,an injection rate of the zinc is decreased when a concentration of the zinc in the coolant exceeds a predetermined value,an injection amount of the zinc in a second stage, in which a generation speed of the oxide film slows compared with a first stage, is reduced compared with that in the first stage.
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Accused Products
Abstract
An object is to reduce radiation exposure in a nuclear plant. A nuclear plant 1 is a nuclear power generating plant where steam is generated by thermal energy generated by nuclear fission of a nuclear fuel 2C in a nuclear reactor 2, and a turbine 8 is driven by the steam to generate heat by a power generator 10. After a nuclear plant 1 is newly constructed, when a primary cooling system of the nuclear reactor 2 raises the temperature to around a power operation temperature for the first time, zinc is injected into a primary coolant C1 present in the primary cooling system by a zinc injector 20.
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Citations
2 Claims
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1. A method of operating a nuclear plant including a pressurized water nuclear reactor, comprising injecting zinc into a coolant present in a primary cooling system of the nuclear reactor to form a oxide film on TT690 material which constitutes an inner surface of a primary cooling-system piping, after construction of the nuclear reactor and during execution of a hot function test, wherein
the zinc is injected when a temperature of the coolant becomes a predetermined temperature which is above the range between 60 and 90 Celsius degrees, an injection rate of the zinc is decreased when a concentration of the zinc in the coolant exceeds a predetermined value, an injection amount of the zinc in a second stage, in which a generation speed of the oxide film slows compared with a first stage, is reduced compared with that in the first stage.
Specification