Chapter 12
Subsection NH—Class 1 Components in Elevated Temperature Service


Chapter 12, authored by Robert I. Jetter, discusses Subsection NH, 2004 Edition, (Class 1 Components in Elevated Temperature Service). The purpose of this chapter is to provide background information on the development and application of the rules for construction of elevated temperature components for nuclear service. Also discussed are the rules for Class 2 and 3 components and core-support structures that are contained in a series of Code Cases. Robert covers all aspects of construction: materials, design, fabrication, inspection, overpressure protection, testing, and marking for Class 1 components in elevated temperature service. In Section III, elevated temperature is defined as 700°F for ferritic steels and 800°F for austenitic stainless steels and nickel-base alloys. Elevated temperature behavior and associated failure modes are discussed to provide background for the unique features of the Subsection NH rules. Robert presumes that readers have a basic familiarity with the rules for construction of Classes 1, 2, and 3 components and core-support structures contained in Subsections NB, NC, ND, and NG, respectively, that are discussed in other chapters of this book. Thus Robert provides cross-referencing to these Code Subsections. Based on 30-plus years in the development and implementation of elevated temperature design and construction rules, Robert, with the aid of figures, tables, and references, provides a historical perspective to establish the criteria for the rules contained in Subsection NH. Also discussed are current and future needs.

  • 12.0 Introduction and Scope
  • 12.1 Article NH-1000, Introduction
  • 12.2 Article NH-2000, Materials
  • 12.3 Article NH-3000, Design
  • 12.4 Article NH-4000, Fabrication and Installation
  • 12.5 Article NH-5000, Examination
  • 12.6 Article NH-6000, Testing
  • 12.7 Article NH-7000, Overpressure Protection
  • 12.8 Other Component Classes, Components, and Materials
  • 12.9 Current and Emerging Issues for Nuclear Components in Elevated Temperature Service
  • 12.10 Future ASME Code Considerations for Nuclear components in Elevated Temperature Service
  • 12.11 References

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