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RELAP5-3D 4.x: Thermal-Hydraulic Nuclear Reactor Analysis, Licensing Opportunity
RELAP5-3D 4.x: Thermal-Hydraulic Nuclear Reactor Analysis, Licensing Opportunity
The Department of Energy, acting through the Battelle Energy Alliance–DOE CNTR, is offering a licensing opportunity for RELAP5-3D 4.x, a system-level modeling code designed for the thermal-hydraulic analysis of nuclear reactors and complex fluid systems. Identified under solicitation number CW-25-06, this technology enables high-fidelity simulations of single- and two-phase flow, reactor kinetics, and fluid-structure interactions. The software supports steady-state and transient analyses in one-, two-, or three-dimensional geometries and is maintained to support modern designs such as small modular reactors, high-temperature gas-cooled reactors, and liquid metal-cooled reactors.
The notice is classified under NAICS 541690 Other Scientific and Technical Consulting Services and PSC R412 SUPPORT- PROFESSIONAL: SIMULATION. The technology addresses the requirement for validated tools to simulate operating and accident scenarios, offering built-in neutron kinetics and an interoperable framework for coupling with external tools for fuel performance or computational fluid dynamics. Its primary applications include advanced reactor licensing, safety analysis for regulatory submittals, and plant performance evaluation. This opportunity is specifically for the licensing of intellectual property to industry partners for commercialization rather than the procurement of services or technology development.
Responses to this special notice are due by November 1, 2026. The place of performance is Idaho Falls, Idaho, and the primary point of contact is Javier Martinez. The notice was published on June 12, 2025, and last updated on April 20, 2026, with zero attachments currently associated with the solicitation.
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Contact and place of performance
Javier Martinez
Idaho Falls, ID 83401
USA
Technology Summary: RELAP5-3D is a fully integrated system-level modeling code for simulating the behavior of nuclear power plants and other complex thermal-fluid systems. Originally developed for light water reactor safety analysis, RELAP5-3D supports detailed modeling of multiphase flow, heat transfer, reactor kinetics, and fluid-structure interactions. It is capable of performing both steady-state and transient an...
View moreRELAP5-3D is actively maintained and enhanced to support modern reactor designs, including small modular reactors, high-temperature gas-cooled reactors, and liquid metal-cooled reactors.
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