高燃耗下UN-FeCrAl燃料元件稳态及瞬态热力学性能分析

何梁; 秋博文; 邬周志; 张坤; 陈平; 高士鑫; 胡超; 邢硕; 范航; 王严培

doi:10.13832/j.jnpe.2022.06.0227

高燃耗下UN-FeCrAl燃料元件稳态及瞬态热力学性能分析

doi: 10.13832/j.jnpe.2022.06.0227

中国核动力研究设计院核反应堆系统设计技术重点实验室，成都，610213

基金项目: 国家重点研发计划（2019YFB1901000）

详细信息

作者简介:
何　梁（1992—），男，工程师，现主要从事反应堆燃料元件设计工作，E-mail: heliang10@163.com

中图分类号: TL352
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- 文章访问数: 253
- HTML全文浏览量: 82
- PDF下载量: 32
- 被引次数: 0
出版历程
- 收稿日期: 2022-07-21
- 修回日期: 2022-08-25
- 刊出日期: 2022-12-14

Steady and Transient Thermodynamic Performance Analysis of UN-FeCrAl Fuel Element under High Burnup

Science and Technology on Reactor System Design Technology Laboratory, Nuclear Power Institute of China, Chengdu, 610213, China

摘要

摘要: UN-FeCrAl燃料元件作为耐事故燃料高燃耗应用的主要方案之一，需要评价其在高燃耗下的热力学性能。本研究基于FUPAC软件对UN-FeCrAl燃料元件在燃耗68000 MW·d·t⁻¹(U)下的稳态和瞬态热力学性能进行了预测。分析结果表明，稳态工况下UN-FeCrAl燃料元件热力学性能表现良好；瞬态下UN燃料的芯块中心温度最高仅为862℃，可满足芯块温度设计要求，但FeCrAl包壳的瞬态应力最大将达到459 MPa，且瞬态应变量相比于稳态应变量最大增加了0.23%，这可能会使FeCrAl包壳面临瞬态应力和瞬态应变准则超限的风险。因此后续研究应重点关注FeCrAl包壳的瞬态应力和瞬态应变性能。
- 耐事故燃料 /
- UN燃料 /
- FeCrAl包壳 /
- 热力学性能
Abstract: The UN-FeCrAl fuel element is one of the main schemes for high burnup application of accident tolerant fuel, and the thermodynamic property of the fuel element under high burnup needs to be evaluated. The steady and transient thermodynamic property of UN-FeCrAl fuel element under 68000 MW·d·t⁻¹(U) was predicted by FUPAC software, and the analysis results showed there is a good thermodynamic property of UN-FeCrAl fuel element under steady condition. Under transient conditions, the maximum pellet center temperature of UN fuel is only 862℃, which can meet the requirements of pellet temperature design, but the maximum transient stress of FeCrAl cladding will reach 459 MPa, and the transient strain will increase by 0.23% compared with steady-state strain, which may make FeCrAl cladding face the risk of transient stress and transient strain criterion exceeding the limit. Therefore, the subsequent research shall focus on the transient stress and transient strain of FeCrAl cladding.
- Accident tolerant fuel /
- UN fuel /
- FeCrAl cladding /
- Thermodynamic property

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图 1 芯块-包壳间隙随燃耗变化曲线

Figure 1. Pellet-Cladding Gap Variation with Burnup

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图 2 芯块中心温度随燃耗变化曲线

Figure 2. Pellet Center Temperature Variation with Burnup

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图 3 燃料元件内压和裂变气体释放率随燃耗变化曲线

Figure 3. Fuel Element Internal Pressure and Fission Gas Release Rate Variation with Burnup

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图 4 包壳Mises应力随燃耗变化曲线

Figure 4. Cladding Mises Stress Variation with Burnup

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图 5 包壳应变随燃耗变化曲线

Figure 5. Cladding Strain Variation with Burnup

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表 1 燃料元件主要参数

Table 1. Main Parameters of Fuel Element

参数	数值
包壳外径/mm	9.5
包壳内径/mm	8.8
包壳厚度/mm	0.35
芯块直径/mm	8.632
气腔长度/mm	180.9
活性段长度/mm	3657.6
初始气体压力/MPa	2.1
初始气体温度/℃	20

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表 2 瞬态性能对比

Table 2. Comparison of Transient Property

参数名	参数值
参数名	线功率密度为 24.46 kW/m	线功率密度为 33.34 kW/m
燃耗/[MW·d·t⁻¹(U)]	68000
经历循环数	4	3
燃料瞬态温度/℃	862	989
燃料元件内压/MPa	8.7	9.2
包壳瞬态应力/MPa	459	478
包壳瞬态应变变化量/%	0.23	0.29

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参考文献(12)

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