Build Nuclear with Local Materials Act of 2026

Overview

• Bill: S. 4529, Build Nuclear with Local Materials Act of 2026
• Session: 119th Congress
• Sponsor(s): Sen. Cynthia Lummis (primary) with Sen. Mark Kelly (co-sponsor)
• Intent: Mandate a Nuclear Regulatory Commission (NRC) rulemaking to allow the use of commercial-grade steel and concrete in non-safety-related structures at nuclear power plants, with a process to pause or tighten standards if a specific safety risk is identified.

Purpose and intent

• The core goal is to enable the use of commercially available (non-specialty) steel and concrete in parts of nuclear plants that are not classified as safety-related.
• The bill directs the NRC to initiate rulemaking within 90 days of enactment to authorize this use, subject to potential stricter standards if justified by safety, national defense, or public health and safety concerns.

Key provisions

• Section 2(a) General Rule:
  • The NRC must start a rulemaking within 90 days after enactment to permit the use of commercial-grade steel and concrete in non-safety-related structures at nuclear power plants.
• Section 2(b) Determination:
  • The NRC may determine that stricter material standards are necessary to address a specific safety risk.
  • Such a determination can be made if the NRC concludes that not using a stricter standard would be contrary to the common defense and security and adequate protection of public health and safety, as defined under the Atomic Energy Act of 1954 (42 U.S.C. 2232(a)).
• Scope:
  • Applies specifically to non-safety-related structures at nuclear power plants (i.e., structures not essential to the safety functions of the plant).
  • Does not mandate immediate adoption of less stringent materials; it sets up a rulemaking pathway with safety-based oversight.

Who/what would be affected

• Affected entities:
  • Nuclear power plant operators and owners.
  • The Nuclear Regulatory Commission (NRC) as the federal regulator.
  • Manufacturers and suppliers of commercial-grade steel and concrete used in non-safety-related plant structures.
• Impacted areas:
  • Non-safety-related structures at reactors (e.g., non-essential buildings, housing, or support infrastructure that are not part of safety systems).

Procedural and timeline aspects

• Timeline:
  • Within 90 days of enactment: NRC must initiate rulemaking to authorize use of commercial-grade materials in the specified scope.
• Process:
  • NRC may set stricter material standards if a specific safety risk is identified and the standard is necessary to protect public health and safety or to address common defense and security concerns.
• Status updates (as of bill’s action history):
  • Introduced and referred to the Senate Committee on Environment and Public Works on May 14, 2026.
  • Subcommittee hearings held on May 20, 2026.

Potential impact and considerations

• Potential benefits:
  • Increased sourcing flexibility and potential cost savings for non-safety-related infrastructure.
  • Local material availability could reduce logistics complexity for some facilities.
• Potential risks:
  • Safety and security concerns require careful evaluation to ensure that non-safety-related structures do not indirectly affect plant safety or defense priorities.
  • NRC rulemaking must be explicit about where commercial-grade materials are permissible and under what conditions stricter standards may apply.
• Oversight:
  • Any adjustment remains subject to NRC determinations and the statutory standard that stricter rules may be adopted to address identified risks.

Summary

S. 4529 seeks to empower the NRC to author a rulemaking within 90 days to permit commercial-grade steel and concrete in non-safety-related structures at nuclear power plants, with a built-in mechanism to tighten standards if necessary to protect safety, public health, and national security. The bill prioritizes a regulated, risk-based approach rather than an across-the-board relaxation of material standards.