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Evaluation Method for Spatial Activity Concentration of Airborne Radioactive Material Sources in Nuclear Power Plants

A technology of radioactive substances and evaluation methods, which is applied in the field of space activity concentration evaluation of airborne radioactive material sources in nuclear power plants, can solve problems such as accuracy problems, and achieve accurate evaluation results

Inactive Publication Date: 2017-04-12
NUCLEAR & RADIATION SAFETY CENT
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Problems solved by technology

[0005] The main purpose of the present invention is to provide a method for evaluating the space activity concentration of airborne radioactive material sources in nuclear power plants, so as to solve the accuracy problems existing in the prior art

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  • Evaluation Method for Spatial Activity Concentration of Airborne Radioactive Material Sources in Nuclear Power Plants
  • Evaluation Method for Spatial Activity Concentration of Airborne Radioactive Material Sources in Nuclear Power Plants
  • Evaluation Method for Spatial Activity Concentration of Airborne Radioactive Material Sources in Nuclear Power Plants

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Embodiment Construction

[0023] In order to make the purpose, 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 and specific embodiments.

[0024] According to an embodiment of the present invention, a method for evaluating the space activity concentration of an airborne radioactive material source in a nuclear power plant is provided. The source of radioactive material in a nuclear power plant includes at least one radionuclide, and the source of radioactive material migrates in at least one space.

[0025] refer to figure 1 , figure 1 It is a flowchart of a method 100 for evaluating the space activity concentration of airborne radioactive material sources in a nuclear power plant according to an embodiment of the present invention.

[0026] The evaluation method 100 includes steps: step 110, for each decay chain of radionuclide, generate a decay-migration grid, and store ...

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Abstract

The invention discloses an evaluation method for space activity concentration of an airborne radioactive substance source of a nuclear power plant. The evaluation method comprises the following steps: aiming at each decay chain of radionuclides, generating decay-migration grids and storing derived decay-migration chains; aiming at each space and each radionuclide in the decay-migration grids, obtaining path numbers from the decay-migration at a starting point to each space-radionuclide grid point and path numbers from the decay-migration of each space-radionuclide grid point to an ending point; aiming at each decay-migration chain, obtaining the activity concentrations of relevant radionuclides in each space according to the corresponding decay constant and removal ratio; accumulating the activity concentrations of the relevant radionuclides of all decay-migration chains in all spaces and comparing the accumulated value with a preset space activity concentration threshold of the relevant radionuclides. According to the technical scheme, accurate evaluation of the airborne radioactive substance source is realized by using a linear subchain technology.

Description

technical field [0001] The invention relates to the field of nuclear radiation safety, in particular to a method for evaluating the space activity concentration of an airborne radioactive material source in a nuclear power plant. Background technique [0002] Airborne radioactive material source calculation is one of the key points in safety analysis and review of nuclear power plants. In the safety analysis methods of major nuclear power plants, in order to simplify the calculation, many assumptions are often adopted. For example, in the process of radionuclide decay, the production of daughter nuclei is not considered; based on conservative assumptions, the time-varying process of radionuclide activity concentration in coolant is not considered, and its equilibrium value is used instead. [0003] However, these assumptions have the following problems. On the one hand, since the decay process will produce new radionuclides, this assumption cannot guarantee conservatism; o...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F19/00
Inventor 刘圆圆张春明郑鹏岳会国
Owner NUCLEAR & RADIATION SAFETY CENT
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