NRC License Amendment Requests for St. Lucie Unit 1 and Diablo Canyon Units 1 & 2 with No Significant Hazards Consideration and SUNSI Access Procedures

The U.S. Nuclear Regulatory Commission (NRC) has received two separate requests to amend operating licenses for nuclear power plants: St. Lucie Plant, Unit No. 1 (Florida) and Diablo Canyon Nuclear Power Plant, Units 1 and 2 (California). The NRC is actively considering approval of both amendment requests as of March 24, 2026. For each amendment request, the NRC has preliminarily determined that the proposed changes involve No Significant Hazards Consideration (NSHC), meaning the changes are not expected to increase the probability or consequences of a radiological accident, create new accident types, or reduce existing safety margins. Because both amendment requests contain Sensitive Unclassified Non-Safeguards Information (SUNSI), the NRC is issuing a formal order establishing controlled procedures governing how members of the public, intervenors, or petitioners may gain access to that sensitive material for the purpose of preparing contentions in any hearing process. Parties wishing to participate in hearings or file petitions to intervene must follow the NRC's SUNSI access procedures, which impose specific requirements to protect sensitive nuclear facility information while still enabling meaningful public participation in the licensing process.

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