06/16/2026
New regulatory and design pathway informally known as Class “B+”
New code approach supplements existing ASME Class B rules by adding required design-life calculations for high-temperature service, addressing the lack of long-term performance guidance for compact heat exchangers and similar advanced nuclear components. Learn more:
A NERS–led Integrated Research Project uses a new “B+” approach within the ASME Boiler and Pressure Vessel Code to support compact heat exchangers and other high-temperature nuclear components.