: Most users create these files using a text editor (like Notepad or TextEdit ) or specialized graphical interfaces like SNAP (Symbolic Nuclear Analysis Package). Example HTSTR Input Structure (Conceptual)

: Researchers often share reference models in public repositories. For instance, models of the NuScale power module or VVER-1000 plants have reference implementations shared in academic databases or GitHub.

Since these files are proprietary or part of specific research projects, they are rarely available as standalone "downloads" on the open web. You can typically find them in the following ways: