CRUD对压水堆硼析出影响的分析模型及其应用
A Model of CRUD Impact on PWR Boron Precipitation and Its Application
摘要: 从20世纪90年代起，许多在运压水堆核电站相继出现污垢引起的轴向功率偏移(CRUD Induced Power Shift, CIPS)，严重影响反应堆的安全运行。运行经验表明，该现象与硼在燃料表面污垢(Chalk Rivers Unidentified Deposit, CRUD)中的析出密切相关。为了研究CRUD对硼析出影响的机理，本工作基于热工水力理论基础建立了CRUD引起的硼析出模型，并利用分析软件CAMPSIS对比了使用天然硼和富集硼作为一回路添加剂对某压水堆CIPS风险的影响程度。结果表明，相对与天然硼，采用富集硼作为一回路添加剂虽然会降低堆内硼元素的析出总量，但在循环寿期末硼10的析出量不降反增。由于硼元素中的硼10才会对燃料组件局部功率产生实质性的影响，因此使用富集硼并不一定能够降低压水堆发生CIPS的风险。
Abstract: Since the 1990s, axial offset anomaly occurred in many pressurized water reactors, which seriously hindered the operation safety of these reactors. Operating experience indicated that this phenomenon has strong relation between the boron precipitation inside fuel CRUD (Chalk Rivers Unidentified Deposit). In order to analyze the impact of boron precipitation on axial power offset, a model is carried out based on thermal hydraulic theory, and the comparison between nature boric acid and enriched boric acid’s effect on axial offset anomaly has been simulated by CAMPSIS, a crud analysis software. The results show that although the total amount of boron precipitation will be less when enriched boron acid is used in the primary circuit, the total amount of boron-10 precipitation will be higher at the end of the cycle. Since boron-10 has the essential influence of fuel assemblies local power, the application of enriched boric acid might not be able to reduce the risk of axial offset anomaly.
文章引用：阮天鸣, 胡艺嵩. CRUD对压水堆硼析出影响的分析模型及其应用[J]. 核科学与技术, 2022, 10(4): 195-203. https://doi.org/10.12677/NST.2022.104020

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