System and method for continuously purifying primary coolant loop of pressurized water reactor nuclear power unit

Abstract

The invention discloses a system and method for continuously purifying a primary coolant loop of a pressurized water reactor nuclear power unit. The method for continuously purifying the primary coolant loop of the pressurized water reactor nuclear power unit comprises the following steps: using a special desalting bed for major repair to perform purification treatment on the primary coolant loopof the unit during the major repair period of the primary coolant loop of the unit; and during the daily operation period of the primary coolant loop of the unit, using a chemical and volume control system mixed bed to perform purification treatment on the primary coolant loop of the unit. As two desalting beds are adopted to singly perform purification treatment on the primary coolant loop of theunit during the major repair and daily operation periods of the primary coolant loop of the unit, function separation of the desalting beds during the major repair and daily operation periods is realized so that the special bed is dedicated and crossed pollution is effectively prevented; resin in the special desalting bed for major repair is filled for volume reduction and single use; during nextmajor repair, the resin is changed with new resin according to a resin volume reduction standard; without changing the unit design, public major repair desalting bed equipment is independent purification of adjacent units, the crossed pollution of the adjacent units is avoided, extra radioactive solid wastes are not increased, the radiation level of the unit is reduced, and the radiation dosage of maintenance personnel is reduced.

Description

technical field [0001] The invention relates to the technical field of nuclear power maintenance, in particular to a system and method for uninterrupted purification of a primary circuit of a pressurized water reactor nuclear power unit. Background technique [0002] A nuclear power plant, also known as a nuclear power plant, is a power plant that uses the energy released by nuclear fission (Nuclear Fission) or nuclear fusion (Nuclear Fusion) reactions to generate electricity. Nuclear power plants currently in commercial operation use nuclear fission reactions to generate electricity. Nuclear power plants are generally divided into two parts: nuclear islands that use nuclear fission to produce steam (including reactor devices and primary loop systems) and conventional islands that use steam to generate electricity (including turbogenerator systems). The fuel used is generally radioactive heavy metals: uranium, plutonium. [0003] The energy released during the fission proc...

AI Technical Summary

Problems solved by technology

The existing technology is not perfect, and radioactive substances that have not been effectively purified are easy to deposit, resulting in an increase in the radiation index of the unit

In addition, during the bypass period of the desalination bed, the impurities in the primary circuit are only purified by the filter. First, the efficiency is low. Second, the filter is frequently blocked and needs to be replaced frequently, which increases radioactive solid waste and increases the radiation dose of maintenance personnel.

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