管道系统的功能性评定准则研究

管道系统的功能性是不同于管道系统压力边界完整性的一项要求，美国核管理委员会（NRC）提出了管道系统功能性的2种评定准则。为了探讨功能性评定准则的来源以及应用，通过研究经典文献中有关功能性评定准则的内容，阐述了2种评定准则的来历和依据，分析了2种功能性评定准则的特点，指出了使用功能性评定准则的注意事项。通过一个管道系统功能性评定的实例，提出2种功能性评定准则在不同的核电厂设计阶段的应用策略。对于新建的核电厂，尽量使用C级限值来保证管道系统的功能性，如果是已建造的核电厂，则可以用D级限值附加5个条件来保证管道系统的功能性。 

Study on Functional Capability of Piping System Evaluation Criteria

The functional capability of piping systems is different from the pressure boundary integrity of piping system, and United States Nuclear Regulatory Commission (NRC) specified two evaluation criteria for the piping functional capability. To explore the origin and the application of functional capability evaluation criteria, and based on the research of classical literatures about the content of functional evaluation criteria, this paper expounds the origin and the basis of two kinds of evaluation criteria, analyzes the characteristics of two kinds of evaluation criteria, and proposed ?notes on the application of two kinds of evaluation criteria. At the end of this paper, through an example of piping functional capability assessment, two strategies for the application of functional assessment criteria in different nuclear plant design stages are proposed. For newly built nuclear power plants, C level stress limit shall be used as possible to ensure the functional capability of piping systems. For the nuclear power plants that had been built,? D level stress limit and five additional conditions can be applied to ensure the functional capability of piping systems.