What is it?
The VTB repository is an open-source git repository that hosts a wide variety of example problems based on advanced reactor designs. These models use a variety of codes but primarily use codes developed under the NEAMS program. This website provides the background and documentation for each problem.
About
The VTB is a National Reactor Innovation Center (NRIC) initiative aiming to facilitate the use of advanced modeling & simulation (M&S) tools developed by the Department of Energy NEAMS program. Following the passage of the Nuclear Energy Innovation Capabilities Act, NRIC was created for accelerating the deployment of these novel reactor concepts. This will be achieved by providing both physical and virtual spaces for building and testing various components, systems, and complete pilot plants. The VTB represents the virtual arm in collaboration with DOE’s NEAMS program.
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NRIC Tech Talk by the VTB team: State-of-the-Art Modeling and Simulation to Support Advanced Reactor Deployment.

Temperature and power density for a control drum rotation transient based on the Empire microreactor.