ISS is a Leading Provider
Comprehensive Nuclear Safety Analysis Solutions
State-of-the-art simulation and analysis software for thermal-hydraulic systems and reactor safety
Our Product Portfolio
Industry-leading software solutions for nuclear safety analysis
RELAP5/SCDAPSIM
Thermal Hydraulic Safety Analysis
The gold standard for thermal hydraulic safety analysis in nuclear power plants worldwide. Comprehensive software for severe accident analysis and thermal hydraulic simulation.
- Comprehensive thermal hydraulic modeling
- Severe accident progression analysis
- Industry-standard for regulatory compliance
ASYST
Adaptive SYStem Thermal-hydraulics
Next-generation Best Estimate Plus Uncertainty (BEPU) accident analysis code for advanced reactor safety analysis and training. Developed through international ADTP consortium collaboration.
- Integrated Uncertainty Analysis (IUA)
- Interactive 3D visualization with RHYS
- LWR to advanced reactor support
RHYS
Graphical Interface for ASYST & RELAP/SCDAPSIM
Cutting-edge graphical interface revolutionizing ISS system codes workflow. Optimizes performance for ASYST and RELAP5/SCDAPSIM from model construction to results analysis.
- Node Viewer for system visualization
- Real-time simulation control
- Windows platform
FUELSIM
Fuel Behavior Simulation
Advanced fuel behavior simulation for detailed analysis of nuclear fuel performance under various operating conditions and accident scenarios.
- Comprehensive fuel performance modeling
- Thermal and mechanical behavior analysis
- Integration with RELAP5/SCDAPSIM
Strip File Creator
Bundle & Save$29.99 - Perpetual License
RELAP/SCDAPSIM and ASYST Strip Files
Parse RELAP/SCDAPSIM and ASYST input decks to generate strip files. Eliminate manual processes and quickly define variables from input deck components.
- Reads RELAP/SCDAPSIM and ASYST input decks (.i files)
- 200+ built-in RELAP/SCDAPSIM variables
- Generates strip files with CSV/FMTOUT formats
Restart File Creator
Bundle & Save$29.99 - Perpetual License
Streamline Simulation Workflow
Resume ASYST and RELAP/SCDAPSIM simulations with confidence. Automatically detect checkpoints and generate clean restart files to save hours of computational time.
- Automatic checkpoint detection
- Safety-first commented restart points
- Windows desktop app (Linux coming soon)
Unlock the Power of Thermal Hydraulic Safety Analysis
Take your nuclear power plant and reactor safety to the next level with our industry-leading software solutions.
Join thousands of satisfied customers worldwide who trust RELAP for their thermal hydraulic safety analysis