摘要
目前,SCDAP/RELAP5采用抛物线型氧化模型模拟严重事故早期再淹没期间的包壳氧化。该模型在模拟包壳温度较高、表面水蒸气流量较小时的氧化存在不足,此外,该模型未分析包壳中氧原子的分布,对包壳失效的准确模拟有限制。本课题对抛物线型氧化模型和扩散氧化模型之间的区别与联系进行分析,并将扩散氧化模型植入SCDAP/RELAP5中,研究两种模型对严重事故早期再淹没现象的模拟效果。结果表明:扩散氧化模型能更好地模拟严重事故早期再淹没现象;抛物线型氧化模型是扩散氧化模型在特定条件下的简化。
At present, the parabolic rate correlation oxidation model is used in SCDAP/RELAP5 code for simulating cladding oxidation during reflooding in the early phase of severe accident, but it can not simulate oxidation well when the cladding temperature is high or the steam flowrate of cladding surface is small. Besides, this model does not analyze the oxygen distribution in the cladding and can not describe the failure of cladding suitably, in this study, those differences and relationships between parabolic rate model and diffusion model are analyzed, and the diffusion oxidation model is employed in SCDAP/RELAP5. Then, the effect of those two models on reflooding in the early phase of severe accident is investigated. It is shown that the diffusion model can simulate the reflooding phenomena better in the early phase of severe accident, and the parabolic rate model is a simplified form of diffusion model based on some specified assumptions.
出处
《核动力工程》
EI
CAS
CSCD
北大核心
2013年第3期32-36,共5页
Nuclear Power Engineering
