核级阀门特性分析模型精度控制策略及安全性能预测

Because of the shape complexity of valve cavity, the nonlinear of joint surface at sealing position and the uncertainty of operating conditions, it is difficult to achieve the safety performance prediction for nuclear valve more rapidly and accurately. In this application, FEA modeling common method for assembly and key components of nuclear power valve is deeply studied in order to master the characteristics and rules in modeling process, then the FEA model precision control strategy is put forward for the characteristic analysis of nuclear power valve. The mechanical model between the valve sealing surface deformation and and normal load based on Hertz contact theory. Using the valve model improved by precision control, the seal failure mode under different magnitude is studied by multi-physics field coupling analysis method, and the prediction model of the reliability is established. Based on the above mentioned works, evaluation theory about operation reliability is set up for nuclear power valve suffered by seismic loads. And then the integrated platform could be constructed combined with the modeling method, the simplified model and the analysis process reuse method, which integrates design, simulation, and optimization of nuclear power valves together supporting heterogeneous model transfer. Expected results can provide the theoretical foundation and design method to design the high security nuclear valve, and important achievements can be made in improving capabilities for predicting safety performance.

由于核级阀门阀体阀腔的复杂性、密封处结合面的非线性和工况的不确定性，难以实现对核阀进行快速、精确地安全性能预测。本申请拟通过研究面向特性分析的核级阀门总成和关键零部件的有限元建模共性方法，以期揭示核级阀门有限元建模特点和规律，提出面向核级阀门特性分析的有限元模型精度控制策略；基于Hertz接触理论建立阀门密封接触面变形与法向载荷之间的力学模型；利用精度控制建立的阀门模型，采用有限元多物理场耦合分析方法，多角度研究不同震级下阀门的密封失效模式，建立密封可靠性预测模型；基于上述工作，建立一套核级阀门地震载荷下运行可靠性的评价理论；并构建支持异构模型传递的核级阀门设计、仿真与优化一体化集成平台，验证所提方法的可行性与有效性。预期成果可为高安全性的核级阀门研制提供理论基础和设计方法，在提高核级阀门安全性预测能力方面更上一个台阶。

本项目针对核电阀门数字化设计技术的实际需求，展开了核电阀门数字化设计技术与集成设计平台构建的基础理论研究工作，取得了预期的理论研究成果，研制了一种新型核级A48安全阀的物理样机，并通过实验研究验证了阀门设计的合理性及运行的可靠性。研究阀门零件分析特征的智能识别与自动处理方法，实现对核电阀门不同特性分析时的有限元模型快速简化；进而，研究支持有限元快速设计分析的重用方法，以实现类似模型之间的有限元分析的知识重用，提高特性分析的效率与精度；然后，依据核电阀门的特点建立其评价指标体系，对典型核电阀门结构进行多物理场仿真分析与评价，包括结构静力学分析、热力耦合分析、流场分析、抗震性分析与密封性分析，以建立适合该类阀门的数值分析方法，完善我国核电阀门设计的技术标准和规范；通过所提出的理论和方法，完成核电阀门设计、仿真与优化一体化集成平台的开发，这对于提高我国核电阀门设计能力与产品性能具有重要理论意义和实际应用价值。