AGENCY:

Nuclear Regulatory Commission

ACTION:

Direct final guide; confirmation of effective date.

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.

DATES:

The effective date of August 18, 2026, for the direct final RG 1.220, Revision 0, published on June 4, 2026 (91 FR 33770), as corrected on June 22, 2026 (91 FR 37152), is confirmed.

ADDRESSES:

Please refer to Docket ID NRC-2025-0677 when contacting the NRC about the availability of information for this action. You may obtain publicly available information related to this action by any of the following methods:

• Federal Rulemaking Website: Go to www.regulations.gov and search ( printed page 67338) for Docket ID NRC-2025-0677. Address questions about Docket IDs in Regulations.gov to Bridget Curran; telephone: 301-415-1003; email: Bridget.Curran@nrc.gov. For technical questions, contact the individual(s) listed in the FOR FURTHER INFORMATION CONTACT section of this document.
• NRC's Agencywide Documents Access and Management System (ADAMS): You may obtain publicly available documents online in the ADAMS Public Documents collection at www.nrc.gov/​reading-rm/​adams.html. To begin the search, select “Begin ADAMS Public Search.” For problems with ADAMS, please contact the NRC's Public Document Room (PDR) reference staff at 1-800-397-4209, at 301-415-4737, or by email to PDR.Resource@nrc.gov.
• NRC's PDR: The PDR, where you may examine and order copies of publicly available documents, is open by appointment. To make an appointment to visit the PDR, please send an email to PDR.Resource@nrc.gov or call 1-800-397-4209 or 301-415-4737, between 8 a.m. and 4 p.m. eastern time (ET), Monday through Friday, except Federal holidays.

RG 1.220, Revision 0, and the Regulatory Analysis, may be found in ADAMS under Accession Nos. ML25329A088 and ML25329A089, respectively. RGs are not copyrighted, and NRC approval is not required to reproduce them.

FOR FURTHER INFORMATION CONTACT:

Thomas Scarbrough, Office of Nuclear Reactor Regulation, telephone: 301-415-2794; email: Thomas.Scarbrough@nrc.gov and Amir Mobasheran, Office of Nuclear Material Safety and Safeguards, telephone: 301-415-8112; email: Amir.Mobasheran@nrc.gov. Both are staff of the U.S. Nuclear Regulatory Commission, Washington, DC 20555-0001.