Kairos Power LLC; Hermes Test Reactor; Environmental Assessment and Finding of No Significant Impact

Document Headings Document headings vary by document type but may contain the following: the agency or agencies that issued and signed a document the number of the CFR title and the number of each part the document amends, proposes to amend, or is directly related to the agency docket number / agency internal file number the RIN which identifies each regulatory action listed in the Unified Agenda of Federal Regulatory and Deregulatory Actions See the Document Drafting Handbook for more details. Nuclear Regulatory Commission [Docket No. 50-7513; NRC-2021-0193] AGENCY: Nuclear Regulatory Commission. ACTION: Notice; issuance. SUMMARY: The U.S. Nuclear Regulatory Commission (NRC or the Commission) is issuing an environmental assessment (EA) and finding of no significant impact (FONSI) regarding the Kairos Power LLC (Kairos or the licensee) request to amend Construction Permit No. CPTR-6 for the Hermes test reactor facility in Oak Ridge, Tennessee. The amendment request seeks NRC approval to extend the latest date for completion of the construction of the Hermes test reactor facility from December 31, 2026, to April 30, 2029. DATES: The EA and FONSI referenced in this document are available on April 21, 2026. ADDRESSES: Please refer to Docket ID NRC-2021-0193 when contacting the NRC about the availability of information regarding this document. You may obtain publicly available information related to this document using any of the following methods: Federal Rulemaking Website: Go to https://www.regulations.gov and search for Docket ID NRC-2021-0193. Address questions about Docket IDs in Regulations.gov to Bridget Curran; telephone: 301-415-1003; email: Bridget.Curran@nrc.gov . For technical questions, contact the individual(s) listed in the For Further Information Contact section of this document. NRC's Agencywide Documents Access and Management System (ADAMS): You may obtain publicly available documents online in the ADAMS Public Documents collection at https://www.nrc.…