Preliminary design of SiC composite cladding fuel rod with lead-bismuth eutectic filled pellet-cladding gap

物性Property	关系式Model
${(\frac{Δ V}{V_{0}})}_{s a t}$ ：饱和肿胀体积变化率^[17] Saturated swelling volume change / % T_irr：辐照温度 Irradiation temperature / K	${(\frac{Δ V}{V_{0}})}_{s a t} = 4.82 - 0 . 006_{} 17 \cdot T_{i r r} + 2.17 \times 10^{- 6} \cdot T_{i r r}^{2}$
${(\frac{Δ V}{V_{0}})}_{i r r}$ ：辐照肿胀体积变化率^[18] Irradiation swelling volume change / % γ：辐照剂量 Irradiation dose / dpa $γ_{s a t}$ = 1 dpa	${(\frac{Δ V}{V_{0}})}_{i r r} = {(\frac{Δ V}{V_{0}})}_{s a t} (1 - e x p (- 6 \frac{γ}{γ_{s a t}}))$
$K_{i r r}^{C V D}$ ：CVD辐照后热导率^[17] Thermal conductivity of CVD SiC after irradiation / W·m^-1·K^-1	$K_{i r r}^{C V D} = {[- 0 . 000_{} 3 + 1.05 \times 10^{- 5} T + 0.06 \times (\frac{Δ V}{V_{0}})]}^{- 1}$
$K_{n o n_i r r}^{C M C}$ ：CMC未受辐照热导率^{[19] -} Thermal conductivity of CMC SiC without irradiation / W·m^-1·K^-1	$K_{n o n_i r r}^{C M C} (T) = (0 . 080_{} 7 + 7.157 \times 10^{- 5} {T)}^{- 1}$
$K_{i r r_s a t}^{C M C}$ ：CMC辐照后热导率^[19] Thermal conductivity of CMC SiC after irradiation / W·m^-1·K^-1	$K_{i r r_s a t}^{C M C} (T_{i r r}) = - 1.484 {(\frac{Δ V}{V_{0}})}_{s a t} (T_{i r r}) + 0 . 342_{} 9$
α：热膨胀系数^[20] Thermal expansivity / K^-1	$α (T) = 10^{- 6} (- 0 . 776_{} 5 + 1.435 \times 10^{- 5} T^{2} + 3 . 828_{} 9 \times 10^{- 9} T^{3})$
$E_{n o n_i r r}^{C V D}$ ：CVD未受辐照杨氏模量^[21] CVD unirradiated Young's modulus / Pa V_p：CVD孔隙率 CVD Porosity, 0.02	$E_{n o n_i r r}^{C V D} (T, V_{p}) = 460 \times 10^{9} \cdot e x p (- 3.57 V_{p}) - 0.04 \cdot e x p (\frac{- 962}{T})$
$E_{i r r}^{C V D}$ ：CVD辐照后杨氏模量^[22] CVD irradiated Young's modulus / Pa	$E_{i r r}^{C V D} = E_{n o n_i r r}^{C V D} \cdot [1 - 0.15 \times (\frac{Δ V}{V_{0}})]$
CVD/CMC泊松比 CVD and CMC Poisson's ratio	0.21/0.13

Table 2. Verification result of LBE gap filled model

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Table 2. Verification result of LBE gap filled model

燃料棒局部线功率 Rod local linear power / W·m^-1	芯块外半径 Pellet outer surface radius / mm	间隙宽度 Gap size / μm	LBE间隙平均温度 LBE gap average temperature / K	间隙温差 Gap temperature difference / K
燃料棒局部线功率 Rod local linear power / W·m^-1	芯块外半径 Pellet outer surface radius / mm	间隙宽度 Gap size / μm	LBE间隙平均温度 LBE gap average temperature / K	FRAPCON计算值 FRAPCON result	理论值 Theoretical result
17.66	4.116	44.0	735.1	2.042	2.044
30.00	4.177	20.6	869.4	1.433	1.438
19.72	4.162	38.8	1 106.9	1.534	1.526

Table 3. Parameters of fuel rod design and operating condition

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Table 3. Parameters of fuel rod design and operating condition

参数Parameter	参数值Value
包壳外径 Cladding diameter	9.76 mm
包壳厚度(CMC/CVD) Cladding thickness	0.45/0.25 mm
间隙尺寸 Gap size	80 μm
活性区长度 Activate length 上空腔长度 Plenum length	3.657 6 m 0.175 m
富集度 Enrichment	4.8%
初始内压 Initial rod pressure 栅距 Rod pitch	2.41 MPa 12.6 mm
冷却剂入口温度 Coolant inlet temperature	565.7 K
冷却剂流量 Coolant mass flow rate	3 434 kg·m^-1·s^-1
冷却剂压力 Coolant Pressure	15.5 MPa

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Ruixiao ZHANG, Yanan HE, Jing ZHANG, Yingwei WU, Wenxi TIAN, Suizheng QIU, Guanghui SU. Preliminary design of SiC composite cladding fuel rod with lead-bismuth eutectic filled pellet-cladding gap[J]. NUCLEAR TECHNIQUES, 2025, 48(2): 020604

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