NUCLEAR TECHNIQUES, Volume. 47, Issue 8, 080602(2024)
Optimal design of passive cooling system for the reactor lower cavity of molten salt reactor
Figures & Tables(20)
Fig. 1. Structure diagram of the lower reactor cabin for the molten salt reactor (a) Structure diagram of the lower reactor cabin, (b) Partial enlarged drawing of air-cooling system
Fig. 2. Diagram of heat transfer process in the lower reactor cabin
Fig. 4. Diagram of partial mesh form the lower reactor cabin in radial direction
Fig. 5. Wall temperature of each device from inside to outside in lower reactor cabin and outlet temperature
Fig. 6. Diagram of 1/4 structural model of air-cooling system with double channel
Fig. 7. Temperature contours of air-cooling system with double channel in the lower reactor cabin (a) Profile figure, (b) Inner wall temperature of safety vessel, (c) Inner wall temperature of normal concrete
Fig. 8. Simulation results corresponding to different widths of air ring chamber (a) Wall temperature of normal concrete, (b) Wall temperature of safety container, (c) Heat removal from air cooling system
Fig. 9. Simulation results corresponding to different distances from the bottom of the central heat shielding plate to the bottom of the air-cooling ring chamber (a) Wall temperature of normal concrete, (b) Wall temperature of safety container, (c) Heat removal from air-cooling system
Fig. 10. Diagram of 1/4 calculation model of a new air-cooling system with double channel
Fig. 12. Calculation results at different thickness of insulation layer d
Fig. 13. Wall temperature counters of normal concrete at different thickness of insulation layer d(a) d=0.03 m, (b) d=0.04 m, (c) d=0.05 m, (d) d=0.06 m
Fig. 14. Velocity streamlines and inner/outer wall temperature counters of air cooling system (a) Flow field of inlet ring cavity, (b) Inner wall temperature of air cooling system, (c) Flow field of outlet ring cavity, (d) Outer wall temperature of air-cooling system
Fig. 15. Wall temperature counters of normal concrete at different inlet positions of the air inlet pipe to top of air cooling cavity(a) L=0.2 m, (b) L=0.5 m, (c) L=0.7 m, (d) L=2 m, (e) L=3.5 m, (f) L=6.5 m
Table 1. Design parameter of the lower reactor cabin for the 153 MWt MSR and its air-cooling system
View tableView in ArticleTable 1. Design parameter of the lower reactor cabin for the 153 MWt MSR and its air-cooling system
参数名称Parameters 值Value 压力容器高
Height of reactor pressure vessel / m
8.17 压力容器半径
Radius of reactor pressure vessel / m
1.86 下舱室空气域宽
Width of air zone in lower reactor cavity / m
1 冷却系统环腔宽
Width of air ring cavity in cooling system / m
0.2 冷却系统环腔高
Height of air ring cavity in cooling system / m
6.97 进出口高度差
Height difference of inlet and outlet / m
26 上保温层厚
Thickness of upper insulation layer / m
1.2 屏蔽钢板厚
Thickness of shielding steel plate / m
0.5 侧/底面保温层厚
Thickness of side/bottom insulation layer / m
1.2/1 安全容器厚
Thickness of reactor safety vessel / m
0.05 侧/底面蛇纹石混凝土厚
Thickness of side/bottom serpentine concrete / m
1.2/1 侧/底面混凝土厚
Thickness of side/bottom concrete / m
1.2/1
Table 2. Physical properties of the structural materials for the lower reactor cabin
View tableView in ArticleTable 2. Physical properties of the structural materials for the lower reactor cabin
材料
Materials
密度
Density
/ g·cm-3
比热
Specific heat
/ J·(kg·K)-1
热导率
Thermal conductivity
/ W·(m·K)-1
N10003 8.66 λ=31 208-101.85T+0.11T 2-4×10-5T 3 λ=1 644.8-5.438T+0.006T 2-2×10-6T 3 碳钢Carbon steel 7.185 470 λ=72.289-0.039 1T-6×10-6T 2 316H不锈钢316H stainless steel 8.03 500 16.2 硅酸铝纤维Alumina silicate fiber 0.22 1 140 λ=0.017-9×10-6T+2×10-7T 2 蛇纹石混凝土Serpentine concrete 2.50 920 1.815 普通混凝土Normal concrete 2.50 920 1.74
Table 3. Grid independence analysis
View tableView in ArticleTable 3. Grid independence analysis
网格数量
Mesh number
混凝土内壁面温度
Temperature of concrete inner wall / ℃
空冷系统排热量
Heat removal from cooling system / kW
5 703 096 81.47 228.46 6 111 522 82.15 249.53 7 262 415 82.71 257.28 8 514 537 82.71 257.28
Table 4. The comparison between CFD simulation and theoretical calculation
View tableView in ArticleTable 4. The comparison between CFD simulation and theoretical calculation
参数名称
Parameters
安全容器壁面温度
Wall temperature of
safety container / ℃
蛇纹石壁面温度
Wall temperature of
serpentine concrete / ℃
混凝土壁面温度
Wall temperature of
normal concrete / ℃
排热
Heat removal
/ kW
理论值Theoretical value 131.4 101.1 82.1 263.54 CFD值Simulation value 132.2 101.8 82.7 257.28 偏差Deviation / % 0.61 0.69 0.73 2.38
Table 5. Optimal design schemes of the passive RCCS for a 153 MWt molten salt reactor
View tableView in ArticleTable 5. Optimal design schemes of the passive RCCS for a 153 MWt molten salt reactor
方案优化步骤
Optimization steps
安全容器壁面最高温度
Max wall temperature
of safety vessel / ℃
混凝土壁面最高温度
Max wall temperature
of safety vessel / ℃
排热量
Heat removal
/ kW
初始结构（单通道空冷系统）
Primary structure (single channel RCCS)
155.6 94.5 268.6 舱室内双通道空冷系统，环腔宽度选择0.2 m
double channel RCCS, and the air ring cavity is 0.2 m
141.3 86.8 447.3 中间隔热板上添加保温棉，保温棉厚度调整为0.06 m
Add insulation layer on the intermediate thermal shield plate,
and change the thickness to 0.06 m
102.7 69.1 447.2 调整进风管入口位置
Change the inlet position of the air inlet pipe
102.5 68.9 447.5
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Mudan MEI, Chong ZHOU, Yao FU, Yang ZOU, Naxiu WANG. Optimal design of passive cooling system for the reactor lower cavity of molten salt reactor[J]. NUCLEAR TECHNIQUES, 2024, 47(8): 080602
Paper Information
Category: NUCLEAR ENERGY SCIENCE AND ENGINEERING
Received: Feb. 21, 2024
Accepted: --
Published Online: Sep. 23, 2024
The Author Email: ZHOU Chong (周翀)
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