核电厂混合堆芯条件下燃料组件抗震性能研究

魏超; 潘昕怿; 别业旺; 宋辰宁

doi:10.11899/zzfy20250006

核电厂混合堆芯条件下燃料组件抗震性能研究

doi: 10.11899/zzfy20250006

1.
生态环境部核与辐射安全中心, 北京 100082
2.
山东建筑大学, 济南 250101

基金项目: 国家科技重大专项课题（2017 ZX06002004-001-005）

详细信息

作者简介:
魏超，男，生于1985年。高级工程师。主要从事反应堆结构力学研究工作。E-mail：weichaoemail@sina.com

通讯作者:
宋辰宁，男，生于1987年。副教授，博士。主要从事结构抗震相关研究。E-mail：scanner2007@163.com

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出版历程
- 收稿日期: 2025-01-10
- 录用日期: 2025-04-11
- 修回日期: 2025-04-10
- 网络出版日期: 2026-01-07

Seismic Performance of Fuel Assembly under Mixed Core Condition of Nuclear Power Plant

1.
Nuclear and Radiation Safety Center, Ministry of Ecology and Environment, Beijing 100082, China
2.
Shandong Jianzhu University, Jinan 250101, China

摘要

摘要: 我国先进燃料组件的自主研发将有助于提升核电厂的经济性和安全性。在新型燃料组件入堆形成混合堆芯时，需要开展燃料组件相容性、中子学特性及抗震性能等方面的安全评价。针对新型燃料组件入堆换料方案中出现的混合堆芯条件，结合自主化新型燃料组件设计改进特点，开展堆芯燃料组件抗震分析，研究不同设计改进和不同装载方案对燃料组件抗震性能的影响。结果表明：均质堆芯条件下，随着单排组件数量的增多，组件格架的最大碰撞力和最大位移逐渐增大，选择单排15个组件开展抗震分析具有一定的保守性。混合堆芯条件下，格架刚度参数变化对入堆第1和第2循环格架最大位移影响较大，导向管壁厚增加和格架刚度减小等参数改进会引起第1循环边缘对称AA组件装载方案格架最大碰撞力的大幅增长，可能超过单排15个组件成为整个堆芯组件格架的最大碰撞力，需要在混合堆芯燃料组件安全评价中重点关注。
- 燃料组件 /
- 混合堆芯 /
- 抗震分析
Abstract: The independent development of advanced fuel assemblies in China is expected to enhance both the economic efficiency and safety of nuclear power plants. When a new fuel assembly is introduced into a reactor to form a hybrid core, it is essential to evaluate fuel assembly compatibility, neutronic characteristics, and seismic performance. Considering the mixed-core conditions under the new fuel assembly refueling scheme and the design improvements of the self-developed fuel assembly, this study conducts seismic analyses of the core fuel assemblies and investigates the effects of different design modifications and loading schemes on their seismic performance. The results indicate that, under homogeneous core conditions, as the number of single-row assemblies increases, both the maximum collision force and maximum displacement of the assembly grid gradually rise, making the selection of 15 single-row assemblies a conservative choice for seismic analysis. Under mixed-core conditions, variations in grid stiffness parameters have a significant impact on the maximum displacement of grids during the first and second reactor cycles. Specifically, increasing the guide tube wall thickness and reducing grid stiffness can substantially increase the maximum collision force of the first-cycle edge symmetrical AA assembly loading scheme, potentially exceeding the maximum collision force of a 15-assembly single-row configuration. These findings highlight critical factors that must be addressed in the safety evaluation of mixed-core fuel assemblies.
- Fuel assembly /
- Mixed core /
- Seismic analysis

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图 1 燃料组件简化模型示意图

Figure 1. Simplified model of fuel assembly

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图 2 燃料组件结构

Figure 2. The structure of fuel assembly

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图 3 平衡循环燃料管理方案

Figure 3. The equilibrium cycle fuel management scheme

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图 4 燃料组件模型前3阶振型

Figure 4. The three vibration modes of the fuel assembly model

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图 5 导向管壁厚参数改进抗震计算结果

Figure 5. Seismic calculation results of guide tube wall thickness

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图 6 格架刚度降低抗震计算结果

Figure 6. Seismic calculation results of grid stiffness reduce

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图 7 格架刚度增加抗震计算结果

Figure 7. Seismic calculation results of grid stiffness increase

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图 8 不同参数改进单排11个组件第1循环各装载方案抗震计算结果

Figure 8. Different parameters improve the seismic calculation results of the first cycle loading schemes of 11 components in a single row

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图 9 新入堆组件位于控制棒位置时不同装载方案抗震计算结果

Figure 9. The seismic calculation results of different loading schemes when the new reactor assembly located at the control rod position

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表 1 新型燃料组件结构设计改进参数

Table 1. Improved parameters of new fuel assembly structure design

组件类型		改进参数描述	入堆方式
A		参照组件	已在堆
B	B1	参照组件导向管壁厚增加0.1 mm	新入堆
	B2	参照组件格架刚度减小5%
	B3	参照组件格架刚度增大5%

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表 2 混合堆芯燃料组件分批次入堆装载方案

Table 2. Mixed core fuel assembly batch loading scheme

序号	组件数量	新组件入堆第1循环	新组件入堆第2循环	新组件入堆第3循环（B组件均质堆芯）
1	3	AAA	AAA	BBB
2	7	A(A)B(B)B(A)A	A(B)B(B)B(B)A	B(B)B(B)B(B)B
3	9	A(B)B(A)A(A)B(B)A	A(B)B(B)B(B)B(B)A	B(B)B(B)B(B)B(B)B
4	11	A(A)B(A)B(A)B(A)B(A)A	A(B)B(B)B(B)B(B)B(B)A	B(B)B(B)B(B)B(B)B(B)B
5	13	A(B)B(A)B(A)B(A)B(A)B(B)A	A(B)B(B)B(B)B(B)B(B)B(B)A	B(B)B(B)B(B)B(B)B(B)B(B)B
6	13	A(B)A(B)A(B)A(B)A(B)A(B)A	B(B)B(B)B(B)B(B)B(B)B(B)B	B(B)B(B)B(B)B(B)B(B)B(B)B
7	15	A(B)A(B)A(B)A(A)A(B)A(B)A(B)A	A(B)B(B)B(B)B(B)B(B)B(B)B(B)A	B(B)B(B)B(B)B(B)B(B)B(B)B(B)B
8	15	A(B)A(A)B(A)A(A)A(A)B(A)A(B)A	A(B)B(B)B(B)B(A)B(B)B(B)B(B)A	B(B)B(B)B(B)B(A)B(B)B(B)B(B)B
注：括号表示堆芯控制棒位置

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表 3 燃料组件前7阶模态计算结果（单位：赫兹）

Table 3. The seven order modal calculation results of fuel assembly （Unit：Hz）

组件类型	阶数
组件类型	1	2	3	4	5	6	7
A	2.85	5.98	9.14	13.10	17.01	22.49	25.75
B1	2.88	6.04	9.25	13.25	17.22	22.73	26.09
B2	2.83	5.87	9.02	12.98	16.87	22.21	25.52
B3	2.86	6.01	9.19	13.21	17.14	22.53	25.91

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