Analysis of typical flow blockage accidents of single annular fuel assembly for lead-bismuth cooled fast reactor

Qi CHEN; Yufan LING; Pengcheng ZHAO; Yanan ZHAO; Tao YU

doi:10.11889/j.0253-3219.2023.hjs.46.110602

Journals >NUCLEAR TECHNIQUES >Volume 46 >Issue 11 >Page 110602 > Article

NUCLEAR TECHNIQUES
Vol. 46, Issue 11, 110602 (2023)

Analysis of typical flow blockage accidents of single annular fuel assembly for lead-bismuth cooled fast reactor

Qi CHEN, Yufan LING, Pengcheng ZHAO^*, Yanan ZHAO, and Tao YU

Author Affiliations

School of Nuclear Science and Technology, University of South China, Hengyang 421001, China

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DOI: 10.11889/j.0253-3219.2023.hjs.46.110602 Cite this Article

Qi CHEN, Yufan LING, Pengcheng ZHAO, Yanan ZHAO, Tao YU. Analysis of typical flow blockage accidents of single annular fuel assembly for lead-bismuth cooled fast reactor[J]. NUCLEAR TECHNIQUES, 2023, 46(11): 110602 Copy Citation Text

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Fig. 1. Geometric structure

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Fig. 2. Schematic diagram of sub-channel numbering

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Fig. 3. Distribution of liner power of fuel element

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Fig. 4. Mesh sensitivity analysis (a) Subchannel 49, (b) Subchannel 21

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Fig. 5. Schematic diagram of the block geometry

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Fig. 6. Effect of blockage area on axial cladding temperature (a) Inner channel, (b) Outer channel

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Fig. 7. Distribution of axial velocity field around blockage of case B2, B3, B4

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Fig. 8. Radial temperature distribution at blockage (a) Inner channel, (b) Outer channel

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Fig. 9. Effect of blockage thickness on axial cladding temperature (a) 25% blockage of inner channel, (b) 25% blockage of outer channel, (c) 75% blockage of inner channel, (d) 75% blockage of outer channel

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Fig. 10. Distribution of axial velocity field around blockage of case A2, A4

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Fig. 11. Radial temperature distribution at blockage (a) 25% blockage of inner channel, (b) 25% blockage of outer channel, (c) 75% blockage of inner channel, (d) 75% blockage of outer channel

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Fig. 12. Effect of axial position of the blockage on axial cladding temperature (a) Inner channel, (b) Outer channel

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参数 Parameter	数值 Values
燃料棒数量 Rod number	25
内包壳内径 Inner diameter of inner cladding / mm	3.643
内包壳外径 Outer diameter of inner cladding / mm	4.243
燃料芯块内径 Inner diameter of fuel pellet / mm	4.393
燃料芯块外径 Outer diameter of fuel pellet / mm	6.427
外包壳内径 Inner diameter of outer cladding / mm	6.577
外包壳外径 Outer diameter of outer cladding / mm	7.177
活性区长度 Length of active region / mm	1 200
栅径比 Pitch to diameter ratio	1.070

Table 1. Geometry parameters of annular fuel assembly

结构材料 Structural material	参数 Parameter	数值 Values
液态铅铋合金 LBE	比热容 Specific heat	$159 - 2.72 \times 10^{- 2} T + 7.12 \times 10^{- 6} T^{2}$
	密度 Density	$1.136 7 - 1.194 4 T$
	热导率 Thermal conductivity	$9.2 + 0.011 T$
	粘性 Viscosity	4.56 $\times 10^{- 3} - 7.03 \times 10^{- 6} T + 3.61 \times 10^{- 9} T^{2}$
包壳 Cladding	比热容 Specific heat	509.61
	密度 Density	7 959.8
	热导率 Thermal conductivity	14.646
气隙 Gap	比热容 Specific heat	5 191
	密度 Density	2.425
	热导率 Thermal conductivity	0.51
氧化铀钚 MOX	比热容 Specific heat	307
	密度 Density	10 994
	热导率 Thermal conductivity	3.919 2

Table 2. Material properties

参数Parameter	数值Values
冷却剂类型 Type of coolant	LBE
冷却剂进口温度 Coolant inlet temperature / K	673.15
质量流量 Mass flow rate / kg·s^-1	54.8

Table 3. Operating parameters

工况编号 Case No.	堵块厚度 Thickness / mm	子通道编号 Subchannel number	堵块起始高度 Start / mm	占通道面积比例 Area percentage / %
A1	10	49	0	25
B1	10	21	0	25
A2	10	49	595	25
B2	10	21	595	25
A3	10	49	595	50
B3	10	21	595	50
A4	10	49	595	75
B4	10	21	595	75
A5	20	49	590	25
B5	20	21	590	25
A6	20	49	590	75
B6	20	21	590	75
A7	30	49	585	25
B7	30	21	585	25
A8	30	49	585	75
B8	30	21	585	75

Table 4. Selected cases of blockage accident

子通道编号 Subchannel number	堵塞面积 Area percentage / %	工况编号 Case No.	流量 Mass flow / kg·s^-1	流量损失 Mass flow loss / %	外通道热量份额 Outer channel heat share / %	内通道热量份额 Inner channel heat share / %
49	0	正常工况 Normal	0.744 363 40	0	60	40
	25	A2	0.716 657 13	3.722 1	62.5	37.5
	50	A3	0.592 132 28	20.451 2	66	34
	75	A4	0.260 966 99	64.940 9	73.7	26
21	0	正常工况Normal	36.233 992	0	60	40
	25	B2	36.233 344	0.06	59.2	40.8
	50	B3	36.213 120	0.05	55.7	44.3
	75	B4	36.188 448	0.13	54.2	45.8

Table 5. Effect of blockage area on mass flow and heat split in inner and outer channel

子通道编号 Subchannel number	堵塞面积 Area percentage / %	工况编号 Case No.	流量 Mass flow / kg·s^-1	流量损失 Mass flow loss / %	外通道热量份额 Outer channel heat share / %	内通道热量份额 Inner channel heat share / %
49	0	正常工况 Normal	0.744 363 4	0	60	40
	25	A2	0.716 657 0	3.722	62.5	37.5
		A5	0.713 416 3	4.157	62.6	37.4
		A7	0.713 340 0	4.167	62.8	37.2
	75	A4	0.260 966 99	64.940 9	73.7	26.3
		A6	0.247 804 44	66.709 0	73.8	26.2
		A8	0.235 041 71	68.424 0	74	26
21	0	正常工况 Normal	36.233 992	0	60	40
	25	B2	36.233 344	0.001 78	59.2	40.8
		B5	36.220 002	0.038 00	59.1	40.9
		B7	36.218 691	0.042 00	58.9	41.1
	75	B4	36.188 448	0.13	54.2	45.8
		B6	36.171 942	0.17	53.3	46.7
		B8	36.167 840	0.18	52.4	47.6

Table 6. Effect of blockage thickness on mass flow and heat split in inner and outer channel

子通道编号 Subchannel number	堵塞面积 Area percentage / %	堵块厚度 Blockage thickness / mm	工况编号 Case No.	流量 Mass flow / kg·s^-1	流量损失 Mass flow loss / %
49	0	10	正常工况 Normal	0.744 363 4	0
	25	10	A1	0.702 245 92	5.645 1
	25	10	A2	0.716 657 13	3.722 1
21	0	10	正常工况 Normal	36.233 992	0
	25	10	B1	36.227 118	0.68
	25	10	B2	36.233 344	0.001

Table 7. Effect of axial position of the blockage on mass flow in inner and outer channel

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