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ASME BPVC.III.1.NG-2025

2025 ASME Boiler and Pressure Vessel Code, Section III, Division 1, Subsection NG, Core Support Structures
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ASME BPVC.III.1.NG-2025

2025 ASME Boiler and Pressure Vessel Code, Section III, Division 1, Subsection NG, Core Support Structures

PUBLISH DATE 2025
ASME BPVC.III.1.NG-2025
The purpose of ASME BPVC.III.1.NG-2025 is to define the mandatory requirements for the material, design, fabrication, and examination of Core Support Structures (classified as Class CS) within nuclear reactor vessels.
What It Is Used For This document is a major subsection of the ASME Boiler and Pressure Vessel Code (BPVC) Section III, Division 1. It is used exclusively by manufacturers and designers of the internal metallic structures inside the reactor pressure vessel that are essential for holding the nuclear fuel core in the correct position. These structures do not hold pressure, but their failure would immediately compromise reactor safety. Its primary uses are:
  • Structural Support of the Core: It applies to the structures or parts of structures designed to provide direct support or restraint of the reactor core (fuel and blanket assemblies) within the reactor pressure vessel. This ensures the geometric integrity of the core is maintained during all operating and emergency conditions.
  • High-Radiation Environment Design: Components covered by Subsection NG operate in a high-radiation, high-temperature environment. The design rules account for this severe environment, ensuring the structural integrity of the internals under normal operation, pressure transients, and seismic events.
  • Specific Fabrication Requirements: Due to the internal location and exposure to high neutron flux, Subsection NG specifies rigorous requirements for material traceability, welding controls, and non-destructive examination (NDE) to ensure the structures will not fail due to stress corrosion or fatigue.
In summary, BPVC.III.1.NG is the technical rulebook for constructing the metallic structures that position and constrain the nuclear fuel inside the reactor, making it vital for controlled nuclear reaction and core integrity.
SDO ASME: American Society of Mechanical Engineers
Document Number BPVC.III.1.NG
Publication Date July 1, 2025
Language en - English
Page Count
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Supercedes
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Publish Date Document Id Type View
July 1, 2025 ASME BPVC.III.1.NG-2025 Revision