Simulation codes for application in reactor safety
These methods are not only applied by GRS in its statements, expert opinions and analyses on the occurrence probability of failures. More than 50 organisations in Germany (e.g. the TÜV) and abroad benefit from these developments and make use of GRS codes. As examples, the main deterministic and probabilistic codes of GRS are listed here, which can be used to simulate accidents and severe accidents, but also ageing and detailed phenomena.
GRS's main customer in the field of reactor safety research is the Federal Ministry for Economic Affairs and Energy. Based on the results from research and development, the respective application-oriented work is included in the interdisciplinary analyses for the scientific expert advice of the federal supervisory authority.
Structural mechanics simulation codes
Codes for the simulation of structural mechanics deal with the safety and lifetime of components in nuclear power plants, e.g. containment structures, pipelines, containers and fuel rod cladding tubes. GRS codes for structural mechanics analyses are WinLeck, PROST and TESPA-ROD.
Codes for the simulation of thermal hydraulics and severe accident sequences
GRS develops computer codes that simulate the fuel rod and core behaviour and severe accident sequences. These include, among others, COCOSYS, ATHLET and ATHLET-CD. Together, the three simulation codes form the GRS code system AC2. In addition, AC2 includes the visualisation tool ATLAS and the optional Numerical Toolkit (NuT) interface to external numerical libraries.
Reactor physics simulation codes
Simulation codes for uncertainty analyses
Codes for analysing the reliability of computational results (e.g. SUSA) examine and evaluate uncertainty sources – parameters, model assumptions, algorithms - in these computer codes to quantify the effect of inaccurate input values in computer codes.
ATLAS analysis simulator
The analysis simulator ATLAS provides a simulation environment used for the visualisation of data and the interactive control of dynamic processes in nuclear power plants. ATLAS is therefore used, for example, for the training of nuclear power plant personnel.
FaSTPro analysis tool for source term prognosis
The analysis tool FaSTPro (Fast Source Term Prognosis) enables the prediction of possible radioactive releases in the event of potential accidents in nuclear power plants. It uses the commercial software Netica ™ of the Norsys Software Corp. to calculate the associated release probabilities.