本报告:1）确定了与ASME锅炉及压力容器规范相关的安全问题，包括第二节、第八节、第三节NH小节（高温运行中的1类部件）以及为支持第四代核反应堆，特别是超高温气冷反应堆（VHTR）的许可而必须解决的规范案例；2） 描述NH小节如何解决这些问题；3）确定需要额外的标准，以涵盖超高温服务未解决的安全问题。 该报告还描述了美国国防部提出的高温结构完整性安全问题。 美国核管理委员会（NRC）和反应堆安全保障咨询委员会（ACRS）以及ASME规范NH小节如何解决这些问题。

This Report:1) identifies the safety issues relevant to the ASME Boiler and Pressure Vessel Code, including Section II, Section VIII, Section III Subsection NH (Class 1 Components in Elevated Temperature Service) and Code Cases that must be resolved in order to support licensing of Generation IV Nuclear Reactors, particularly Very-High-Temperature Gas-Cooled Reactors (VHTRs); 2) describes how Subsection NH addresses these issues; and 3) identifies the needs for additional criteria to cover unresolved safety concerns for very-high-temperature service. The report also contains a description of the high-temperature structural integrity safety concerns raised by the U.S. Nuclear Regulatory Commission (NRC) and the Advisory Committee on Reactor Safeguards (ACRS) and how these issues are addressed in Subsection NH of the ASME Code.