OpenMC/Model library
Local only

Start with a shape.
Build the hierarchy.

Create a model from scratch or open a starter. Edit surfaces, cells and repeated universes, then export the files for OpenMC.

Nested cylinder surfaces A cutaway fuel pin drawn as concentric layers: fuel, gap, cladding and moderator.
one model, linked views

Starter library

Editable examples and benchmark references.

BEAVRS opens as a source-based, simplified 2D slice. Other benchmark cards link to references; generic reactor layouts are illustrative.

Sources & versions ↗
LOCAL EXPORT

Take the model with you

Files are generated in your browser. Geometry output is a starter subset; run your intended model through your installed OpenMC release before use.

Nothing is uploaded by this export.
MODEL NOTES

About this geometry
GEOMETRY

Add an item

Choose a bounded primitive to add to this model.

New items begin as named geometry surfaces. Assigning a material or adding the cell to a universe is the next step.