The U.S. Nuclear Regulatory Commission (NRC) is issuing a presolicitation notice for a requirement entitled, “Maintenance of NRC Codes Five (MONC-V)” The objective of this contract is to support the NRC’s safety mission by providing high-quality and timely regulatory thermal-hydraulic research, code development expertise, code maintenance support, and other technical products that facilitate regulatory safety analysis. The Contractor shall provide thermal-hydraulic (T/H) code and model development and improvements, as well as configuration control, correction of code errors, documentation updates, and user support to the NRC, its contractors, and members of international Code Applications and Maintenance Program and the domestic user community. The period of performance will be a total of five years. The North American Industry Classification System (NAICS) code for the services required is 541690 . Request for Proposal (RFP) No. 31310026R0023 will be posted on, or about, July 1, 2026 as full and open competition under FAR Part 15. Closing date for receipt of proposals will be on, or about, 30 days thereafter. This solicitation is open to all business size standards. RFP No. 31310026R0023 will be distributed solely through www.sam.gov. All future information about this acquisition, including solicitation amendments will also be distributed solely through www.SAM.gov . Interested parties are responsible for monitoring www.SAM.gov to assure that they have the most up-to-date information about this acquisition. The Government will not reimburse interested parties for any cost associated with responding to this business opportunity. Vendors must be registered with the System for Award Management (SAM) database to receive a government contract award. Vendors must also be registered in Representations and Certifications Applications (included in SAM). The North American Industry Classification System (NAICS) Code applicable (541690 listed above) to this acquisition must be in vendor's SAM registration. Note: Update SAM profile to include all applicable NAICS Codes associated with your company. Vendors may register for SAM online at www.sam.gov or by calling 1-866-606-8220. In accordance with FAR 4.1102, offerors are required to be registered in SAM.GOV at the time an offer or quotation is submitted in order to comply with the annual representations and certifications requirements.