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Chapter 31
Iwe and Iwl

Excerpt

ASME Section XI, Subsection IWE, Requirements for Class MC and Metallic Liners of Class CC Components of Light-Water Cooled Plants, specifies requirements for preservice and inservice examination/inspection, repair/replacement activities, and testing of Class MC (metal containment) pressure-retaining components and their integral attachments and repair/replacement activities and testing of Class CC (concrete containment) pressure-retaining components and their integral attachments for Boiling Water Reactors (BWRs) and Pressurized Water Reactors (PWRs). Similarly, Subsection IWL, Requirements for Class CC Concrete Components of Light-Water Cooled Plants, specifies requirements for preservice and inservice examination/inspection, repair/replacement activities, and testing of the reinforced concrete and the post-tensioning systems of Class CC (concrete containment) components for BWRs and PWRs. Together with Subsection IWA, General Requirements, a comprehensive basis is provided for ensuring the continued structural and leak-tight integrity of containments in nuclear power facilities.

The U.S. Nuclear Regulatory Commission (USNRC or NRC) incorporated the requirements of the 1992 Edition with the 1992 Addenda of Subsections IWA, IWE, and IWL into the Code of Federal Regulations (CFR) in an amendment of Title 10, Part 50.55a (10 CFR 50.55a) [4] that was published in the Federal Register (FR) on August 8, 1996. This amendment, 61 FR 41303 [5], contained rules that provided requirements in addition to those in Subsections IWE and IWL, and also specified that certain provisions in these Subsections were optional and not required for regulatory compliance. The rulemaking also required that all nuclear power plants in the United States develop and implement a containment inspection program in accordance with Section XI, Subsections IWA, IWE, and IWL (as applicable for the type of containment) by September 9, 2001.

On September 12, 1999, the USNRC amended this rulemaking in a subsequent rulemaking, 64 FR 51370 [6], to incorporate by reference the 1995 Edition with the 1996 Addenda of Subsections IWA, IWE, and IWL into 10 CFR 50.55a. The rule also allowed Owners to continue to use the 1992 Edition with the 1992 Addenda of these Subsections for the containment inspection program, if so desired. The effective date for this amendment was November 22, 1999. Again, this rulemaking included several requirements in addition to those of ASME Section XI, and is also required that the Owners of all nuclear power plants in the United States develop and implement a containment inspection program by September 9, 2001.

  • 31.1 Introduction
  • 31.2 Regulatory Requirements for Containments
  • 31.3 ASME Code Requirements for Containments
  • 31.4 General Requirements
  • 31.5 Requirements for Metal (Class MC) Containments
  • 31.6 Requirements for Concrete (Class CC) Containments
  • 31.7 Later Code Editions and Addenda
  • 31.8 Code Cases and Interpretations
  • 31.9 Advance Nuclear Power Plant Designs
  • 31.10 References

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