Radiation Evaluation System for Radiation Releasing Environment of Nuclear Power Plant Based on Domain-Driven Design
Authors: Zhanyang Liu , Zhihong Shang-Guan , Feng Zhao , Qiming Zhang 
Published: October 2017

In order to meet the sustainable development demand for energy, developing nuclear power actively has become an important means for the country to improve energy supply pattern and change the energy structure. The normal operation of the nuclear power station brings enormous economic and social benefits, but also accompanied by airborne radioactive effluent and liquid radioactive effluent discharge. In order to estimate the effect of radioactive effluent release during the normal operation of nuclear power plant on radiation dose of the environment and the public, in this article, domain knowledge analysis and domain knowledge modeling will be carried out on the theoretical model of evaluation calculation. Then, combined with actual business logic, advanced software development techniques and mature design ideas will be adopted to realize the field component of radiation dose evaluation in nuclear power plant. Establish the corresponding domain component library, and thus to achieve the building of radiation dose evaluation software system.

The main content of this paper will be divided into two parts to elaborate, First part is the domain knowledge analysis and modeling of radiation dose evaluation model of nuclear power plant radiation environment, the other part is based on radiation dose evaluation component library software system researching, designing and achieving.

In the domain knowledge analysis of the radiation dose estimation model, due to the mutual independence of the airborne radioactive effluent and the liquid radioactive effluent in the evaluation mode, this paper will analyze and model the domain knowledge separately. The airborne radioactive effluent is divided into four parts: air immersion external exposure, ground deposition external irradiation, ingestion inhalation and inhalation in air. The main contents of the analysis include atmospheric diffusion suitable for environmental characteristics of nuclear power plant site, ground deposition factors, food chain data, and lifestyle habits around the site. In the field of knowledge analysis of liquid radioactive effluent, there are four ways: external marine activity irradiation, coastal deposit sediment irradiation, and irradiation of seafood. The analysis mainly includes dilution and diffusion conditions in the surrounding sea area of nuclear power plant, the radionuclide in the seawater of the receiving water body, the shore sedimentation factor and the transfer model of the radionuclide in the seafood.

Based on the detailed analysis and research on the radiation dose evaluation of nuclear power plant, and the designing of the domain model by adopting mature software design idea and the advanced software development technology, the domain component of the radiation dose evaluation field is realized, and build the corresponding domain component library. This can provide a reliable and usable domain component library for the radiation dose evaluation of each nuclear power plant, improve the maintainability of the radiation dose evaluation system of the nuclear power plant, the comprehensibility of business logic, and the reusability of the evaluate module, so as to meet the calculation demands on radiation dose effects of public caused by radionuclide release in normal operation of the nuclear power plant.