A nuclear cooling system with no moving parts — try it

This is the physics model an AI agent built (and validated against Argonne measurements) for a half-scale passive Reactor Cavity Cooling System: a hot wall radiates to steel ducts, and buoyant air does the rest. Drag the sliders. No servers — the physics runs in your browser.

Heat load (what the reactor vessel emits) Outdoor air temperature Wind over the chimneys

negative wind = unfavorable direction (opposes the draft)

Airflow (no pump!)

Air heats up by

Vessel-wall temperature

Duct wall (front face)

How the heat crosses the gap:

Model: gray-surface radiation network (σεΔT⁴) + turbulent duct convection (Blasius/Dittus-Boelter) + a buoyancy-vs-friction loop balance, i.e. the same ~100 lines of physics the agent wrote. It reproduces Argonne's measured baseline within a few percent (flow +1%, vessel wall −4%) but is a simplification: air temperature rise reads ~10–15% high (see the article for why), and wind coupling to the real building is cruder than reality. It is a toy for intuition, not a licensing tool.