Opportunity Overview
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 analyses in one-, two-, or three-dimensional geometries, making it one of the most versatile nuclear systems analysis tools in use today.
Problem Addressed:
Designers, operators, and regulators of nuclear systems need validated tools to simulate a wide range of operating and accident scenarios, from routine transients to complex multi-physics events. Many commercial codes lack the physics detail or numerical flexibility needed to capture the behavior of advanced reactor designs, high-fidelity safety cases, or coupled systems involving multiple working fluids or complex geometries.
Proposed Solution:
RELAP5-3D enables high-fidelity simulations of nuclear thermal-hydraulics and safety behavior. Key capabilities include:
Modeling of single- and two-phase flow using a two-fluid model
Support for multiple fluids, flow regimes, and non-condensable gases
Built-in reactor kinetics and neutron transport models (point kinetics or 3D neutron kinetics)
Fully coupled heat structures and control system modeling
Parallel processing and restart capabilities for large, complex runs
Optional coupling with external tools for fuel performance, CFD, or systems-level co-simulation
RELAP5-3D is actively maintained and enhanced to support modern reactor designs, including small modular reactors, high-temperature gas-cooled reactors, and liquid metal-cooled reactors.
Key Advantages:
Comprehensive Simulation Capabilities: Supports steady-state, transient, and accident analysis across multiple reactor types and configurations
Multidimensional Modeling:...
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 analyses in one-, two-, or three-dimensional geometries, making it one of the most versatile nuclear systems analysis tools in use today.
Problem Addressed:
Designers, operators, and regulators of nuclear systems need validated tools to simulate a wide range of operating and accident scenarios, from routine transients to complex multi-physics events. Many commercial codes lack the physics detail or numerical flexibility needed to capture the behavior of advanced reactor designs, high-fidelity safety cases, or coupled systems involving multiple working fluids or complex geometries.
Proposed Solution:
RELAP5-3D enables high-fidelity simulations of nuclear thermal-hydraulics and safety behavior. Key capabilities include:
Modeling of single- and two-phase flow using a two-fluid model
Support for multiple fluids, flow regimes, and non-condensable gases
Built-in reactor kinetics and neutron transport models (point kinetics or 3D neutron kinetics)
Fully coupled heat structures and control system modeling
Parallel processing and restart capabilities for large, complex runs
Optional coupling with external tools for fuel performance, CFD, or systems-level co-simulation
RELAP5-3D is actively maintained and enhanced to support modern reactor designs, including small modular reactors, high-temperature gas-cooled reactors, and liquid metal-cooled reactors.
Key Advantages:
Comprehensive Simulation Capabilities: Supports steady-state, transient, and accident analysis across multiple reactor types and configurations
Multidimensional Modeling:...
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Start FreeSolicitation Details
| Issuing agency | Battelle Energy Alliance–Doe Cntr |
|---|---|
| Country | United States |
| Category | Research and Studies |
| NAICS | 541690 |
| PSC | R412 |
| Published | April 20, 2026 |
| Procurement stage | Request for Proposal (RFP) |
| Response due | November 01, 2026 |
| Status | Open — accepting responses |
| Official source | View original notice |
| Last verified | August 10, 2026 |
Source: U.S. Government (SAM.gov) — public domain. GlobalGov is not affiliated with or endorsed by the United States Government.
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