Regulatory Guide: Acceptability of ASME OM-2 Code, Component Testing Requirements at Nuclear Facilities

Summary

The U.S. Nuclear Regulatory Commission (NRC) is confirming the effective date of August 18, 2026, for Revision 0 of Regulatory Guide (RG) 1.220, "Acceptability of ASME OM-2 Code, Component Testing Requirements at Nuclear Facilities." The RG was noticed in the Federal Register on June 4, 2026, with a follow up Correction to the Notice, published on June 22, 2026, stating the effective date of August 18, 2026. This new RG endorses, with a regulatory position, the American Society of Mechanical Engineers (ASME) Operation and Maintenance OM-2 Code, Component Testing Requirements at Nuclear Facilities, 2024 Edition, and describes an approach that is acceptable to the NRC staff for the development and implementation of an Inservice Testing (IST) Program for all types of nuclear facilities.