Reactor coolant water quality control method suitable for rod control reactor core

Abstract

The invention discloses a reactor coolant water quality control method suitable for a rod control reactor core, the water quality control method comprises adding of boric acid to a reactor coolant, and the boric acid is enriched boron-11 boric acid, the abundance of 11B in the enriched boron-11 boric acid ranges from 80.2% to 100%; and in the coolant, the concentration of B element ranges from 10mg/kg to 300 mg/kg. The method can not only effectively reduce the corrosion of a primary circuit structural material of a nuclear power plant, improves the adverse effect of local concentration of analkalizing agent on the corrosion of zirconium alloy, reduces deposition and activation of corrosion products on the surface of a fuel cladding, improves the safety and reliability of operation of afuel assembly, and at the same time can reduce the negative impact on overall indicators such as life, economy and safety.

Description

technical field [0001] The invention relates to the technical field of nuclear reactors, in particular to a reactor coolant water quality control method suitable for rod-controlled reactor cores. Background technique [0002] The reactor coolant in the pressurized water reactor nuclear power plant is used as the moderator and heat carrier of the system, and its working conditions are harsh. of corrosion. Reactor coolant water quality directly affects the corrosion of primary circuit structural materials and the release, migration and deposition of corrosion products, and is closely related to the long-term safe and reliable operation of the reactor. [0003] In order to reduce the corrosion of primary circuit structural materials of PWR nuclear power plants and reduce the deposition and activation of corrosion products on the surface of fuel cladding, PWR nuclear power plants generally use alkaline water quality. At present, land-based pressurized water reactor nuclear pow...

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Problems solved by technology

[0005] The reactor coolant water quality scheme based on the boron-controlled core proposed above is not suitable for pressurized water reactor nuclear power plants with rod-controlled cores. If the ammonia-type water quality scheme is adopted, a special coolant degassing system needs to be configured. As a result, the related process configuration and operation are relatively complicated, and the water quality scheme is mainly applicable to the problem of pressurized water reactor nuclear power plants adopting nitrogen pressure stabilization. The present invention provides a method for controlling the water quality of reactor coolant suitable for rod-controlled cores. This method can not only effectively reduce the corrosion of the structural materials of the primary circuit of the nuclear power plant, but also improve the adverse effect of the local concentration of the alkalizing agent on the corrosion of the zirconium alloy, reduce the deposition and activation of corrosion products on the surface of the fuel cladding, and improve the safety and reliability of the fuel assembly operation. ; At the same time, it can reduce the negative impact on overall indicators such as lifespan, economy, and safety