RELAP5/SCDAPSIM
The Gold Standard for Thermal Hydraulic Safety Analysis
Comprehensive Nuclear Safety Analysis
RELAP5/SCDAPSIM is the industry-leading thermal hydraulic safety analysis code trusted by nuclear facilities worldwide for regulatory compliance and severe accident analysis. Combining RELAP5's robust thermal hydraulic modeling with SCDAP's severe accident progression capabilities, this integrated code provides unparalleled accuracy for nuclear safety engineering.
Regulatory Compliance
Industry-standard software accepted by regulatory bodies worldwide for safety analysis and licensing.
Severe Accident Analysis
Advanced SCDAP capabilities for core degradation, melt progression, and fission product release.
Global Standard
Trusted by nuclear facilities in over 30 countries for safety evaluation and accident analysis.
Comprehensive Modeling Capabilities
Advanced physics models for complete nuclear safety analysis
Thermal Hydraulic Modeling
Best-estimate thermal hydraulic analysis for light water reactors under operational transients and postulated accidents. Includes full two-phase flow modeling with advanced constitutive correlations.
- Two-phase flow with six-equation model
- Flow regime mapping and transitions
- Critical flow and choking models
Severe Accident Progression
Comprehensive SCDAP modeling for severe accident scenarios including core degradation, melt relocation, and debris bed formation with coupled thermal hydraulics.
- Fuel rod oxidation and hydrogen generation
- Core melt progression and relocation
- Lower plenum debris bed behavior
Extensive Component Library
Comprehensive library of validated component models for all major reactor systems including pumps, valves, heat structures, and control systems.
- Pumps, valves, and flow control devices
- Heat structures and heat exchangers
- Control systems and trip logic
Fission Product Behavior
Track fission product release, transport, and deposition throughout the reactor coolant system for source term analysis and radiological consequence assessment.
- Fuel-to-coolant fission product release
- Aerosol transport and deposition
- Chemical species tracking
Advanced Visualization & Post-Processing
Powerful visualization tools for comprehensive results analysis
Comprehensive Post-Processing Tools
Time Series Plotting
Plot any variable from simulation results with multiple traces, custom scales, and export capabilities.
Data Export
Export simulation results to CSV, Excel, or ASCII format for further analysis and reporting.
Animation Tools
Create animations of transient behavior for presentations and detailed analysis review.
Applications Across Nuclear Safety Analysis
Licensing Analysis
Design basis accidents and safety evaluation reports for regulatory submissions.
Beyond Design Basis
Severe accident scenarios including station blackout and LOCA with core damage.
Validation Studies
Code validation against experimental data and plant measurements.
Training & Education
Academic instruction and operator training program development.
Plant Modifications
Safety impact assessment for plant design changes and power uprates.
PRA & Risk Analysis
Probabilistic risk assessment and risk-informed decision making.
Technical Specifications
Proven technology with continuous development and validation
Platform Support
Windows, Linux, Unix
Programming Language
FORTRAN (highly optimized for performance)
Reactor Types
PWR, BWR, VVER, CANDU, advanced reactor designs
Development History
40+ years of continuous development and validation
Key Features
- Best-estimate thermal hydraulics with validated correlations
- Integrated severe accident modeling with SCDAP
- Extensive validation against experimental data
- Regulatory acceptance worldwide
- Active user community and support network
- Comprehensive documentation and training materials
Trusted Worldwide
Used in over 30 countries for nuclear safety analysis
Experience the Industry Standard
Join leading nuclear facilities worldwide in using RELAP5/SCDAPSIM for thermal hydraulic safety analysis.
Need training or support? Contact our expert team