Abstract
Evaluation of aerosol deposition in the containment vessel is an important step for the assessment of radioactive material release to the environment. ART Mod 2 is a calculation code that is used for evaluation of aerosol deposition in the containment vessel. The authors modified aerosol deposition models of ART Mod 2, namely, gravitational settling model, Brownian diffusion model, diffusiophoresis model, and thermophoresis model in order to increase potential of capturing the deposition phenomena. This study aims to compare the simulated results of modified ART Mod 2 with aerosol deposition of cesium compounds in the containment vessel of Phébus FPT3 experiment, in order to validate modified ART Mod 2 code. It is found that aerosol deposition using modified ART Mod 2 agrees with Phébus FPT3. Prediction of Brownian diffusion is significantly improved due to the consideration of turbulent damping process. Cesium mass flow rate and aerosol size are factors that can significantly influence the uncertainty of the results. When conditions of single volumes are carefully selected to match those of the Phébus FPT3 experiment, modified ART Mod 2 can predict aerosol deposition in Phébus FPT3 with relative accuracy.
Highlights
Thailand Institute of Nuclear Technology (TINT) and Chulalongkorn University (CU) have been conducting research on nuclear power plant safety since 2012, putting emphasis on severe accident studies
The second research topic is on assessment of cesium compound behavior in containment vessel using ART Mod 2 of Japan Atomic Energy Research Institute (JAERI), which aims to understand the behavior of cesium compounds in containment vessel
The authors compare the results from modified ART Mod 2 with (1) the Phebus FPT3 experimental results measured with online gamma spectrometry in Table 11 [6, 23], (2) the Phebus FPT3 calculated results using deposition kinetic models in Figure 11 [6, 23], and (3) the results from original ART Mod 2 [13]
Summary
Thailand Institute of Nuclear Technology (TINT) and Chulalongkorn University (CU) have been conducting research on nuclear power plant safety since 2012, putting emphasis on severe accident studies. The reason to this is that the Fukushima Accident, which is a severe accident, has driven attention of the public toward nuclear power safety, and it is the appropriate place to start. The second research topic is on assessment of cesium compound behavior in containment vessel using ART Mod 2 of Japan Atomic Energy Research Institute (JAERI), which aims to understand the behavior of cesium compounds in containment vessel (this study). The last research topic [3, 4] is on the consideration of accident consequence assessment methodology which can cover the overall consequences for people and the environment, in order to be able to consider consequences other than health effects due to radiation exposure which was basically the only thing considered in preceding studies
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