A method for controlling zinc concentration in primary circuit of nuclear power plant

Abstract

The invention discloses a method for controlling zinc concentration in a primary circuit of a nuclear power plant, including a method for controlling zinc concentration in a primary circuit during a thermal state function test and a method for controlling zinc concentration during charging operation. The preconditions for adding zinc and the control for zinc concentration are determined. methods and processes. According to the changing law of zinc concentration, the invention gradually changes the zinc addition speed in stages, and precisely controls the concentration of zinc in the primary circuit, which is a technology that can reduce the stress corrosion cracking of the primary circuit and reduce the radiation field; The zinc solution added in the primary circuit contains less 64 Zn-depleted zinc acetate ( 64 Zn content <1%) solution, effectively reducing the new radiation source caused by adding zinc; the invention develops a method for calculating the speed of adding zinc according to the surface area of ​​the primary circuit equipment, so that the control of the speed of adding zinc is more accurate, and the scope of application Wider; less dosage of overhaul personnel, which ensures the personal safety of workers, and will not affect the performance of fuel cladding.

Description

technical field [0001] The invention relates to the technical field of nuclear power energy, in particular to a method for controlling the concentration of zinc in the primary circuit of a nuclear power plant, which is suitable for a pressurized water reactor or a boiling water reactor nuclear power plant using the zinc-adding technology. Background technique [0002] The operating experience of the power station shows that the addition of zinc in the primary circuit is beneficial to reduce the primary side stress corrosion cracking (PWSCC), reduce the corrosion rate of the equipment, reduce the deposition of corrosion products on the core fuel, and reduce the radiation dose outside the core. [0003] The absorption rate of zinc by the equipment materials of the primary circuit system changes continuously with the accumulation time of zinc addition, so it is necessary to adjust the zinc addition rate at different stages according to the zinc concentration and zinc addition ti...

AI Technical Summary

Problems solved by technology

Check the domestic nuclear power plant’s primary circuit zinc dosing information, but it is still in theoretical research, and there is no proven practical experience and data to guide how to choose the chemical type of zinc dosing, the preconditions of zinc dosing, how to control the zinc concentration, how to add zinc How to control the zinc rate, how to prepare the concentration of the zinc tank, how to deal with abnormal zinc concentration, etc.

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