RELAP5-3D 4.x: Thermal-Hydraulic Nuclear Reactor Analysis, Licensing Opportunity Tender

Procurement Summary

Country: USA

Summary: RELAP5-3D 4.x: Thermal-Hydraulic Nuclear Reactor Analysis, Licensing Opportunity

Deadline: 01 Aug 2025

Other Information

Notice Type: Tender

TOT Ref.No.: 120837763

Document Ref. No.: CW-25-06

Financier: Self Financed

Purchaser Ownership: Public

Tender Value: Refer Document

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Tender Details

Description

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-simulationRELAP5-3D 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 Multidim...
Active Contract Opportunity
Notice ID : CW-25-06
Related Notice
Department/Ind. Agency : ENERGY, DEPARTMENT OF
Sub-tier : ENERGY, DEPARTMENT OF
Office: BATTELLE ENERGY ALLIANCE–DOE CNTR
General Information
Contract Opportunity Type: Special Notice (Original)
Original Published Date: Jun 12, 2025 11:54 am EDT
Original Response Date: Aug 01, 2025 10:00 am EDT
Inactive Policy: 15 days after response date
Original Inactive Date: Aug 16, 2025
Initiative:
Classification
Original Set Aside:
Product Service Code: R412 - SUPPORT- PROFESSIONAL: SIMULATION
NAICS Code: 541690 - Other Scientific and Technical Consulting Services

Place of Performance: Idaho Falls, ID 83401 USA

Documents

 Tender Notice