A novel approach for radionuclide diffusion in the enclosed environment of a marine nuclear reactor during a severe accident

Fang Zhao; Shu-Liang Zou; Shou-Long Xu; Xuan Wang; Jun-Long Wang; De-Wen Tang

doi:10.1007/s41365-022-01007-z

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A novel approach for radionuclide diffusion in the enclosed environment of a marine nuclear reactor during a severe accident

NUCLEAR ENERGY SCIENCE AND ENGINEERING | Updated：2022-03-18

- A novel approach for radionuclide diffusion in the enclosed environment of a marine nuclear reactor during a severe accident
- Nuclear Science and Techniques Vol. 33, Issue 2, Article number: 19(2022)
- Affiliations：
  
  1.School of Resource Environment and Safety Engineering, University of South China, Hengyang 421001, China
  2.Hunan Provincial Key Laboratory of Emergency Safety Technology and Equipment for Nuclear Facilities, Hengyang 421001, China
  3.Shanghai Nuclear Engineering Research & Design Institute Co.LTD, Shanghai 200000, China
  4.Science and Technology on Reactor System Design Technology Laboratory, Nuclear Power Institute of China, Chengdu 610213, China
- Author bio：
  
  zhaofang_usc@126.com
  zousl2013@126.com;
  xusl@usc.edu.cn;
- Funds：
- DOI：10.1007/s41365-022-01007-z
  CLC：
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Fang Zhao, Shu-Liang Zou, Shou-Long Xu, et al. A novel approach for radionuclide diffusion in the enclosed environment of a marine nuclear reactor during a severe accident. [J]. Nuclear Science and Techniques 33(2):19(2022)
DOI：

Fang Zhao, Shu-Liang Zou, Shou-Long Xu, et al. A novel approach for radionuclide diffusion in the enclosed environment of a marine nuclear reactor during a severe accident. [J]. Nuclear Science and Techniques 33(2):19(2022) DOI： 10.1007/s41365-022-01007-z.

摘要

Abstract

A severe accident in a marine nuclear reactor leads to radionuclide leakage, which causes hidden dangers to workers and has adverse effects of environmental pollution. It is necessary to propose a novel approach to radionuclide diffusion in a confined environment after a severe accident in a marine nuclear reactor. Therefore, this study proposes a new method for the severe accident analysis program MELCOR coupled with computational fluid dynamics scSTREAM to study radioactive diffusion in severe accidents. The radionuclide release fraction and temperature calculated by MELCOR were combined with the scSTREAM calculations to study the radionuclide diffusion behavior and the phenomenon of radionuclide diffusion in different space environments of the reactor under the conditions of varying wind velocities of the ventilation system and diffusion speed. The results show that the wind velocity of the ventilation system is very small or zero, and the turbulent diffusion of radionuclides is not obvious and diffuses slowly in the form of condensation sedimentation and gravity settlement. When the wind speed of the ventilation system increases, the flow of radionuclides meets the wall and forms eddy currents, affecting the time variation of radionuclides diffusing into chamber 2. The wind velocity of the ventilation system and the diffusion speed have opposite effects on the time variation trend of radionuclide diffusion into the four chambers.

关键词

Keywords

Radionuclide diffusionMELCOR coupled with scSTREAMSevere accidentMarine nuclear reactor

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