# Approval of American Society of Mechanical Engineers Unconditioned Code Cases
> **Nuclear Regulatory Commission** · Direct final rule; confirmation of effective date. · Published 2026-01-27 · Effective 2026-01-26 · 91 FR 3359
## Document
- **Document number:** 2026-01494
- **Category:** other
- **Sub-agency:** Nuclear Regulatory Commission
- **Federal Register citation:** 91 FR 3359
- **CFR reference:** 10 CFR 50
- **Publication date:** 2026-01-27
- **Effective date:** 2026-01-26
- **Energy docket:** NRC-2024-0163
## Abstract

The U.S. Nuclear Regulatory Commission (NRC) is confirming the effective date of January 26, 2026, for the direct final rule that was published in the Federal Register on September 26, 2025. This direct final rule amended the regulations to incorporate by reference a regulatory guide that approved unconditioned code cases published by the American Society of Mechanical Engineers. This action allows nuclear power plant applicants and licensees to use the code cases as voluntary alternatives to engineering standards for nuclear power plant components.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2026/01/27/2026-01494/approval-of-american-society-of-mechanical-engineers-unconditioned-code-cases)
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