发生落棒事故时的PCI研究

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PCI Analysis during Rod Drop Transient

National Key Laboratory of Reactor System Design Technology, Nuclear Power Institute of China, Chengdu, 610041, China

摘要: 当反应堆发生落棒事故时,燃料芯块与包壳的相互作用瞬间增强,易造成燃料棒破损,从而影响核电站的正常运行。本文介绍了反应堆II类瞬态下燃料棒芯块与包壳相互作用的机理和定量分析方法,并针对大亚湾核电站18个月换料的燃料管理方案进行了发生落棒事故时的PCI热力学评价。初步的研究结果表明:如果在自然循环长度和延伸燃耗运行期内发生落棒事故,对于基负荷运行和基负荷一次调频运行,均有PCI的应力裕量,不会造成燃料棒破损。
- 燃料芯块 /
- 包壳 /
- 相互作用 /
- 落棒事故
Abstract: During rod drop transient,the interaction between pellet and cladding increases instantly,which may leads to failure of fuel rod.This paper introduces the mechanism and quantative method to analyze PCI during transient II,with which the PCI thermal-mechanical analysis has been carried out for the 18-month fuel cycle management of GNPS.The results show there are enough stress margins for the base load operation and primary frequency control operation if rod drop accident occurs in the natural cycle and stretch out operation,therefore no risk of PCI failure has been found.
- Pellet /
- Cladding /
- Interaction /
- Rod drop