The main purpose of this legislation, known as the "Build Nuclear with Local Materials Act of 2026," is to allow nuclear power plants to use commercially available steel and concrete for structures that are not directly related to safety. This change aims to simplify construction processes and potentially reduce costs by using materials that are more readily available. Key provisions of the law require the Nuclear Regulatory Commission (NRC) to start a rulemaking process within 90 days of the law being enacted.