A method for assessing chemical effects after an accident in a pressurized water reactor nuclear power plant

Abstract

The invention provides a method for evaluating the post-accident chemical effect of a pressurized water reactor nuclear power plant. The method comprises the following steps: collecting relevant environmental parameters in a post-accident containment of the nuclear power plant; determining the chemical compositions of a chemical precipitate inside the containment, and introducing the environmental parameters into a plurality of preset analytical models to obtain the corresponding yield of each chemical composition respectively in the chemical precipitate; obtaining maximum value of the yield obtained by the same type of chemical compositions in each analytical model respectively according to the types of the chemical compositions, and taking the maximum value of the corresponding yield of each chemical composition as a final result. Through the implementation of the method, the type and yield of the post-accident chemical precipitate of the pressurized water reactor nuclear power plant can be evaluated, so that an accurate basis is provided for evaluating the influence of the chemical product on the performance of a pit filter and the functional reliability of ECCS and CSS recycling, improvement measures are further established, and the purpose of improving the safety of a pressurized water reactor unit is reached.

Description

technical field

[0001] The invention relates to the technical field of nuclear power plant accident treatment, in particular to a method for evaluating chemical effects after an accident in a pressurized water reactor nuclear power plant. Background technique

[0002] After a LOCA (Loss of Coolant Accident) occurs in a pressurized water reactor nuclear power plant, the high-temperature and high-pressure reactor coolant will be released into the containment of the pressurized water reactor unit, and the CSS (Containment The Spray System (Containment Spray System) also releases water containing pH buffers, so that after the LOCA accident the containment is filled with water, reactor coolant compounds, pH formed from sodium hydroxide, sodium tetraborate, and trisodium phosphate. The chemical solution composed of buffer and other chemical substances makes the chemical environment in the containment very complex and harsh.

[0003] Under the above-mentioned complex and harsh che...

Examples

Embodiment Construction

[0028] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0029] like figure 1 Shown, a kind of method for evaluating the chemical effect after the accident of pressurized water reactor nuclear power plant that the embodiment of the present invention provides, described method comprises:

[0030] Step S101, collecting related environmental parameters inside the containment after the nuclear power plant accident;

[0031] The specific process is to collect environmental parameters such as the PH value change curve of the containment pit solution in the containment after the nuclear power plant accident, the coolant temperature change curve, the water content of the pit, and the density of boron-containing water. Take relatively conservative assumptions for a simplified assessment.

[0032] Step S102. Determine the chemi...

technical field

[0001] The invention relates to the technical field of nuclear power plant accident treatment, in particular to a method for evaluating chemical effects after an accident in a pressurized water reactor nuclear power plant. Background technique

[0002] After a LOCA (Loss of Coolant Accident) occurs in a pressurized water reactor nuclear power plant, the high-temperature and high-pressure reactor coolant will be released into the containment of the pressurized water reactor unit, and the CSS (Containment The Spray System (Containment Spray System) also releases water containing pH buffers, so that after the LOCA accident the containment is filled with water, reactor coolant compounds, pH formed from sodium hydroxide, sodium tetraborate, and trisodium phosphate. The chemical solution composed of buffer and other chemical substances makes the chemical environment in the containment very complex and harsh.

[0003] Under the above-mentioned complex and harsh che...

Examples

Embodiment Construction

[0028] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0029] like figure 1 Shown, a kind of method for evaluating the chemical effect after the accident of pressurized water reactor nuclear power plant that the embodiment of the present invention provides, described method comprises:

[0030] Step S101, collecting related environmental parameters inside the containment after the nuclear power plant accident;

[0031] The specific process is to collect environmental parameters such as the PH value change curve of the containment pit solution in the containment after the nuclear power plant accident, the coolant temperature change curve, the water content of the pit, and the density of boron-containing water. Take relatively conservative assumptions for a simplified assessment.

[0032] Step S102. Determine the chemi...

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