NUCLEAR TECHNIQUES, Volume. 46, Issue 9, 090606(2023)
Geometric configuration of fuel assembly for small lightweight lead-bismuth reactor
Figures & Tables(19)
Fig. 2. Diagram lead-bismuth cooled reactor fuel assembly (a) Rod bundle type, (b) Annular type, (c) Honeycomb coal type
Fig. 3. Steady-state thermal-hydraulic parameters vary with the inner diameter of the annular fuel element
Fig. 4. Diagram of control body division (a) Rod bundle type, (b) Annular type, (c) Honeycomb coal type
Fig. 5. Verification results of computing module in STAC code for honeycomb coal fuel assembly
Fig. 7. Radial power distribution of fuel element in core hottest assembly (a) Rod bundle type, (b) Annular type, (c) Honeycomb coal type
Table 1. Lead-bismuth cooled reactor core design parameters
View tableView in ArticleTable 1. Lead-bismuth cooled reactor core design parameters
参数
Parameters
棒束型
Rod bundle type
环形
Annular type
蜂窝煤型
Honeycomb coal type
热功率Thermal power / MW 4 4 4 活性区等效直径Active area equivalent diameter / cm 84.16 84.16 84.16 活性区高度Active area height / cm 85 85 85 燃料富集度Fuel enrichment / % 24.63 24.63 24.63 燃料组件数目Number of fuel assemblies 31 31 31 包壳厚度Cladding thickness / cm 0.03 0.018 6 (内/外 Inside/outside) 0.030 8 气隙厚度Airgap thickness / cm 0.015 0.009 0 (内/外 Inside/outside) 0.014 3 栅距Grid pitch / cm 1.62 1.62 1.62 包壳外径Outer diameter of cladding / cm 1.290 1.425 1.288 栅径比Pitch to diameter ratio 1.256 1.137 1.258 组件盒厚度Component box thickness / cm 0.4 0.4 0.4 堆芯半径Core radius / cm 143.943 143.943 143.943
Table 2. Verification results of rod bundle type fuel assembly computing module in STAC code (℃)
View tableView in ArticleTable 2. Verification results of rod bundle type fuel assembly computing module in STAC code (℃)
参数Parameters 计算值 Calculation values 参考值Reference values 相对误差 Relative errors 冷却剂最大温度Maximum coolant temperature 306.50 307.00 -0.001 63 包壳外表面最大温度Maximum outer surface temperature of fuel cladding 352.19 351.70 0.001 393 包壳内表面最大温度Maximum inner surface temperature of fuel cladding 420.34 419.70 0.001 525 燃料表面最大温度Maximum fuel surface temperature 736.56 738.34 -0.002 41 燃料中心最大温度Maximum fuel center temperature 2 329.56 2 313.77 0.006 824
Table 3. Verification results of annular type fuel assembly computing module in STAC code (℃)
View tableView in ArticleTable 3. Verification results of annular type fuel assembly computing module in STAC code (℃)
参数Parameters 计算值
Calculation values
参考值
Reference values
相对误差
Relative errors
19×19
组件
Assembly
外包壳外表面温度Outer surface temperature of outer fuel cladding 526.77 527.586 -0.001 55 外包壳内表面温度Inner surface temperature of outer fuel cladding 534.33 539.41 -0.009 42 燃料外表面温度Outer surface temperature of fuel 584.59 616.345 -0.051 52 燃料最高温度Maximum fuel temperature 692.40 707 -0.020 65 燃料内表面温度Inner surface temperature of fuel 591.29 602.46 -0.018 54 内包壳内表面温度Inner surface temperature of inner fuel cladding 535.66 533.49 0.004 068 内包壳外表面温度Outer surface temperature of inner fuel cladding 525.93 517.73 0.015 838 15×15
组件
Assembly
外包壳外表面温度Outer surface temperature of outer fuel cladding 538 531.53 0.012 172 408 外包壳内表面温度Inner surface temperature of outer fuel cladding 550 543.35 0.012 238 888 燃料外表面温度Outer surface temperature of fuel 620.1 635.96 -0.024 938 675 燃料最高温度Maximum fuel temperature 787.58 786 0.002 010 178 燃料内表面温度Inner surface temperature of fuel 608.43 630 -0.034 238 095 内包壳内表面温度Inner surface temperature of inner fuel cladding 545.57 547.29 -0.003 142 758 内包壳外表面温度Outer surface temperature of inner fuel cladding 535.84 519.704 0.031 048 443
Table 4. Neutron energy spectrum of three cores
View tableView in ArticleTable 4. Neutron energy spectrum of three cores
能量区间
Energy range
/ MeV
中子通量密度
Neutron flux density / n·cm-2·s-1
棒束型
Rod bundle
type
环形
Annular
type
蜂窝煤型
Honeycomb coal type
<1×10-6 1.856 78×107 1.902 99×107 1.975 21×107 1×10-6~1×10-1 4.414 23×109 4.318 05×109 4.193 92×109 >1×10-1 2.391 71×1013 2.389 78×1013 2.383 57×1013
Table 5. Reactivity coefficients of three cores
View tableView in ArticleTable 5. Reactivity coefficients of three cores
类别Category 反应性系数
Reactivity coefficient /10-5 K-1
寿期初
Beginning of life
寿期中
Middle of life
寿期末
End of life
棒束型Rod bundle type αD -0.172 5 -0.189 7 -0.202 7 αC -0.607 7 -0.617 4 -0.654 7 αA -0.222 5 -0.225 3 -0.226 5 αR -0.106 4 -0.111 2 -0.111 5 环形Annular type αD -0.167 5 -0.185 8 -0.195 1 αC -0.523 7 -0.566 4 -0.462 0 αA 0.225 3 -0.228 9 -0.224 6 αR -0.111 1 -0.116 4 -0.106 8 蜂窝煤型Honeycomb coal type αD -0.158 0 -0.137 9 -0.112 1 αC -0.540 6 -0.589 9 -0.591 0 αA -0.222 2 -0.225 6 -0.222 2 αR -0.151 9 -0.155 7 -0.151 0
Table 6. Distribution of energy deposition in different fuel assemblies
View tableView in ArticleTable 6. Distribution of energy deposition in different fuel assemblies
区域 Region 棒束型 Rod bundle type 环形 Annular type 蜂窝煤型 Honeycomb coal type 燃料 Fuel / % 96.98 96.87 97.04 组件盒 Assembly box / % 0.32 0.33 0.41 包壳 Cladding / % 0.16 0.16 0.05 冷却剂 Coolant / % 2.54 2.64 2.49
Table 7. Main thermal-hydraulic parameters of three cores
View tableView in ArticleTable 7. Main thermal-hydraulic parameters of three cores
参数
Parameter
棒束型
Rod bundle
type
环形
Annular type
蜂窝煤型
Honeycomb coal type
提升压降Raise pressure drop / Pa 85 163 85 213/85 139 85 631 摩擦压降Friction pressure drop / Pa 2 297.8 1 258.3/3 640 453.1 燃料芯块最大温度Maximum temperature of fuel pellet / K 718 662.0 (内/外 Inside/outside) 651.5 包壳最大温度Maximum temperature of cladding / K 651.1 653.1/651.8 (内/外 Inside/outside) 637.0 冷却剂最大温度Maximum temperature of coolant / K 623.7 646.1/652.9 (内/外 Inside/outside) 631.5
Table 8. The design parameters of three optimized cores
View tableView in ArticleTable 8. The design parameters of three optimized cores
堆芯参数
Fusion core parameter
棒束型
Rod bundle type
环形
Annular type
蜂窝煤型
Honeycomb coal type
热功率Thermal power / MW 4 4 4 活性区等效直径Active area equivalent diameter / cm 69.51 68.44 65.07 活性区高度Active area height / cm 70.20 69.12 65.72 活性区体积Active area volume / cm3 266 392 254 281 218 549 燃料富集度Fuel enrichment / % 24.63 24.63 24.63 燃料组件数目Number of fuel assemblies 31 31 31 包壳厚度Cladding thickness / mm 0.300 0.186 (内/外 Inside/outside) 0.308 气隙厚度Airgap thickness / mm 0.150 0.090 (内/外 Inside/outside) 0.143 栅距Grid pitch / cm 1.310 1.287 1.216 包壳外径Outer diameter of cladding / cm 1.236 1.233 0.685 组件盒厚度Component box thickness / cm 0.4 0.4 0.4 冷却剂流通面积Coolant flow area / cm2 1 053.57 1 049.87 817.85 燃料装载量Fuel loading / kg 1 502.80 1 460.90 1 367.71 包壳最大温度Maximum temperature of cladding / K 809.9 809.6 810.1
Table 9. Neutron energy spectrum of three optimized cores
View tableView in ArticleTable 9. Neutron energy spectrum of three optimized cores
能量区间
Energy range
/ MeV
中子通量密度Neutron flux density / n·cm-2·s-1 棒束型
Rod bundle
type
环形
Annular type
蜂窝煤型
Honeycomb coal type
<1×10-6 8.752 53×106 1.072 81×107 6.676 79×106 1×10-6~1×10-1 3.189 88×1013 3.260 73×1013 3.558 31×1013 >1×10-1 9.250 69×1013 9.649 48×1013 1.089 07×1014
Table 10. Reactivity coefficients of three optimized cores
View tableView in ArticleTable 10. Reactivity coefficients of three optimized cores
类别Category 反应性系数
Reactivity coefficient / 10-5 K-1
寿期初
Beginning of life
寿期中
Middle of life
寿期末
End of life
棒束型Rod bundle type αD -0.164 0 -0.173 8 -0.163 9 αC -0.394 3 -0.536 0 -0.368 8 αA -0.224 1 -0.225 0 -0.227 0 αR -0.066 4 -0.069 7 -0.068 9 环形Annular type αD -0.110 9 -0.160 2 -0.120 4 αC -0.316 4 -0.299 5 -0.419 9 αA -0.240 3 -0.247 1 -0.246 5 αR -0.062 5 -0.070 4 -0.067 1 蜂窝煤型Honeycomb coal type αD -0.090 7 -0.144 1 -0.141 8 αC -0.291 8 -0.217 0 -0.261 8 αA -0.249 9 -0.248 6 -0.253 1 αR -0.052 1 -0.052 6 -0.049 3
Table 11. Thermal-hydraulic parameters of three optimized cores
View tableView in ArticleTable 11. Thermal-hydraulic parameters of three optimized cores
参数
Parameter
棒束型
Rod bundle
type
环形
Annular type
蜂窝煤型
Honeycomb coal type
提升压降Raise pressure drop / Pa 69 434 67 933 / 67 934 64 759 摩擦压降Friction pressure drop / Pa 7 605.7 2 989.9 / 5 567.5 807.0 燃料芯块最大温度Maximum temperature of fuel pellet / ℃ 577.5 545.8 562.3 包壳最大温度Maximum temperature of cladding / ℃ 536.9 536.5/536.6 (内/外 Inside/outside) 537.1 冷却剂最大温度Maximum temperature of coolant / ℃ 536.7 536.4/536.3 (内/外 Inside/outside) 534.2
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Chang WANG, Hao XIAO, Zijing LIU, Haotong CHANG, Weijia WANG, Pengcheng ZHAO. Geometric configuration of fuel assembly for small lightweight lead-bismuth reactor[J]. NUCLEAR TECHNIQUES, 2023, 46(9): 090606
Paper Information
Category: Research Articles
Received: Apr. 4, 2022
Accepted: --
Published Online: Oct. 8, 2023
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