# Federal Register #NRC-2022-0215

NRC Requests Public Comment on Draft Guidance for Material Compatibility in Non-Light Water Reactors

**Buyer:** Nuclear Regulatory Commission
**Posted:** September 21, 2026
**Respond By:** November 05, 2026
**Identifier:** NRC-2022-0215

The U.S. Nuclear Regulatory Commission (NRC) is requesting public comment on draft guidance for material compatibility in non-light water reactors.
- Government Buyer:
  - U.S. Nuclear Regulatory Commission (NRC)
- Purpose:
  - Seeking input on draft Interim Staff Guidance (ISG) titled "Material Compatibility for non-Light-Water Reactors, DANU-ISG-2023-01, Revision 1"
- Scope:
  - Guidance assists NRC staff in reviewing applications for non-light water reactor designs (power and non-power reactors)
  - Updated appendix describes information used to review materials of construction and performance of passive structures, systems, and components (SSCs)
  - Includes updates to technical information and applicability to additional NRC regulations
- Notable Requirements:
  - Focus on materials performance, environmental compatibility, and performance monitoring for safety-significant SSCs in advanced reactor applications
- No products or services are being procured
- No OEMs or vendors are mentioned; this is a request for public input, not a procurement opportunity

### Description

The U.S. Nuclear Regulatory Commission (NRC) is soliciting public comment on its draft Interim Staff Guidance (ISG), titled "Material Compatibility for non-Light-Water Reactors, DANU-ISG-2023-01, Revision 1." This guidance aims to assist NRC staff in reviewing applications for non-light water reactor designs, including both power and non-power reactors. The ISG has been updated to include an appendix describing information used to review materials of construction and passive structures, systems, and components (SSCs) performance for non-light water reactors, along with updates to technical information and applicability to additional NRC regulations. Public comments are requested by November 5, 2026.

[View original listing](https://www.federalregister.gov/documents/2026/09/21/2026-19217/draft-interim-staff-guidance-material-compatibility-for-non-light-water-reactors)