NUCLEAR TECHNIQUES, Volume. 46, Issue 2, 020605(2023)
Simulation study of tritium atmospheric dispersion of loss of vacuum accident of a fusion reactor
Figures & Tables(14)
Fig. 1. Distribution of near-surface radioactivity concentration along the downwind direction during the mixed release phase
Fig. 2. Distribution of near-surface radioactivity concentrations along the downwind direction during the individual release phase
Fig. 3. Nephogram of radioactive concentration distribution (a) 1.5 h, (b) 2 h, (c) 3 h, (d) 4 h, (e) 5 h, (f) 6 h
Fig. 4. Variation of near ground level radioactivity concentration at different wind speeds (950 m)
Fig. 5. Distribution of near-surface radioactivity concentration at different wind speeds (t=2 h)
Fig. 6. Distribution of near-surface radioactivity concentration at different release heights (t=2 h)
Fig. 7. Near-ground radioactivity concentration at various locations at different release heights(a) Downwind 500 m, (b) Downwind 1 000 m, (c) Downwind 2 000 m, (d) Downwind 5 000 m
Table 1. Wind profile coefficient m value[15]
View tableView in ArticleTable 1. Wind profile coefficient m value[15]
下垫面
Underpad surface
大气稳定度 Atmospheric stability A B C D E F 农田 Farmland 0.10 0.15 0.20 0.25 0.35 0.40 城市/丘陵 Urban/hilly 0.11 0.12 0.14 0.25 0.39 0.44
Table 2. Input parameters of the steady-state computational model
View tableView in ArticleTable 2. Input parameters of the steady-state computational model
参数 Parameter Q / GBq·s-1 H / m u / m·s-1 vd / m·s-1 K θ v0 / m·s-1 α 数值 Value 1.967 1 2.25 0.000 4 BC 0.3[ 18 ]4 0.3
Table 3. Comparison of steady-state calculation results and experimental data
View tableView in ArticleTable 3. Comparison of steady-state calculation results and experimental data
测量点坐标
Coordinates / m
实验数据
Experimental data / MBq·m－3
HotSpot 3.0
/ MBq·m－3
本模型
Developed model / MBq·m－3
(50,16,1) 0.707 ― 0.703 (50,8,1) 1.12 ― 2.77 (50,0,1) 1.64 4.5 4.37 (183,70,1) 0.063 3 ― 0.016 7 (183,0,1) 0.135 0.46 0.418 (400,35,1) 0.011 7 ― 0.081 1 (400,0,1) 0.015 4 0.098 0.098 2
Table 4. Transient calculation model input parameters
View tableView in ArticleTable 4. Transient calculation model input parameters
参数 Parameters Q / TBq H / m u / m·s－1 vd / m·s－1 K θ D / m v0 / m·s－1 α 数值Value 73.86 60 2.44 0.000 4 D 0.3 2.4 13.5 1.0
Table 5. Comparison of transient calculation results and experimental data
View tableView in ArticleTable 5. Comparison of transient calculation results and experimental data
事故后时间
Time after the accident / h
实验数据
Experimental data / MBq·m－3
UFOTRI
/ MBq·m－3
本模型Developed model
/ MBq·m－3
5 0.014 4 2.48 0.042 1
Table 6. Input parameters for loss of vacuum accident analysis model
View tableView in ArticleTable 6. Input parameters for loss of vacuum accident analysis model
参数
Parameters
Q / TBq·s－1 vd / m·s－1 K θ α 数值
Value
65.14（0≤t≤1 h）
7.54（0≤t≤6 h）
0.000 4 D 0.3 0.3
Table 7. Release characteristics of tritium
View tableView in ArticleTable 7. Release characteristics of tritium
类型 Type 释放量
Release amount / g
释放时间
Release time / h
低温泵和共沉积层中的氚
Tritium in cryogenic pumps
and co-deposited layers
440+120 0≤t≤1 共沉积层中的氚
Tritium in co-deposited layers
440 0≤t≤6
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Jinghua JIANG, Xuewu CAO. Simulation study of tritium atmospheric dispersion of loss of vacuum accident of a fusion reactor[J]. NUCLEAR TECHNIQUES, 2023, 46(2): 020605
Paper Information
Category: Research Articles
Received: Jun. 16, 2022
Accepted: --
Published Online: Mar. 2, 2023
The Author Email: CAO Xuewu (caoxuewu@sjtu.edu.cn)
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