反应堆Ⅱ类瞬态下燃料棒PCI研究

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Study on PCI under Condition Ⅱ Transients for Fuel Rod

Science and Technology on Reactor System Design Technology Laboratory, Nuclrar Power Institute of China, Chengdu, 610041, China

摘要: 介绍反应堆Ⅱ类瞬态下燃料棒芯块与包壳相互作用(PCI)分析方法和PCI热-力学计算理论模型,在此基础上对海南核电厂降功率燃料管理方案进行PCI评价,并对影响PCI失效裕量的因素进行分析。结果表明,所有瞬态条件下包壳的应变能密度与技术限值相比较都有裕量;瞬态局部线功率越大,瞬态发生前局部燃耗越深,PCI失效裕量越小;瞬态发生前,降功率时间越长,PCI失效裕量越小;降功率后再升功率,裕量得到一定程度恢复。
- 芯块 /
- 包壳 /
- PCI /
- Ⅱ类瞬态
Abstract: The PCI evaluation methodology for Condition Ⅱ transients and thermal-mechanical theoretical model are introduced. The PCI evaluation for the decreasing power operation fuel management of Hainan NPP is performed. The analysis for the PCI margin factors is also carried out. The primary analysis shows that: there are comfortable margins comparing strain energy density of cladding with PCI technological limit value during all the transients; Higher local linear heat generated rate during transients and deeper local burnup before transients will induce lower margin for PCI; the longer decreasing power time before transient is, the lower margin is; Increasing power after decreasing power will increase margin in a certain extent.
- Pellet /
- Cladding /
- PCI /
- Condition Ⅱ transients