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Critical Heat Flux & DNBR Margin Simulator

Interactive 3D fuel-rod boiling-crisis simulator: tune heat flux, coolant pressure, mass flux and subcooling, watch the boiling regime shift from nucleate boiling toward departure from nucleate boiling (DNB), and read the live DNBR safety margin a PWR core follows in real reactor engineering.

Nuclear Physics3DAdvanced60 FPS📱 Mobile-adapted⇄ 2D version

Every pressurized-water reactor is operated against one governing thermal-hydraulic limit: the departure from nucleate boiling ratio (DNBR), the margin between the heat flux a fuel rod is actually delivering and the critical heat flux at which the coolant film on its surface collapses into an insulating vapor blanket. This simulator renders a 3D fuel rod in its coolant channel and computes a real Zuber-correlation critical heat flux from system pressure, then applies flow and subcooling corrections exactly as core thermal design does, so you can push heat flux, pressure, coolant mass flux and subcooling until the rod crosses from stable nucleate boiling into a modeled boiling crisis and watch clad temperature run away in real time.

⚙ Under the hood

Interactive 3D fuel-rod boiling-crisis simulator: tune heat flux, coolant pressure, mass flux and subcooling, watch the boiling regime shift toward departure from nucleate boiling, and read the live DNBR safety margin a real PWR core is operated against.

nuclear engineeringreactor thermal hydraulicscritical heat fluxDNBRboiling crisisPWR safety

3D · Three.js / WebGL renderer · 60 FPS target · runs fully client-side, no install