Release Location
click to place source · anywhere on the map · anchors the dose footprint
The Gaussian plume is a straight-line, steady-state solution: the dose footprint extends downwind of the release point along the wind direction set on the dial. The location anchors the contours on the real map — the dose values themselves depend only on the source term, meteorology and geometry on the left.
Release Location
click to place source · domain 25–45°E · 33–45°N · max 48 h
Built for emergency response: the latest GFS forecast is always staged on the RADOSE server, so a run can start the moment an accident is reported — no data download, no waiting. The Lagrangian engine advects a 20 000-particle ensemble through hourly 3-D wind and boundary-layer fields, so the plume bends and meanders with the real weather — unlike the straight-line Gaussian solution. Particles are followed for up to 48 h after the release.
Reactor / Core Parameters
Inventory coefficients are calibrated against four independent OpenMC depletion campaigns (FLEXBLUE, mPower, ACP100, NuScale); valid for LEU UO₂-fuelled PWR/iPWR designs with uninterrupted operation over the last ~40 days. Core age = EOC batch-average full-power days (affects Cs-137 only).
Core Inventory
Saturating nuclides (Xe-133, I-131) scale with power alone; Cs-137 scales with total energy produced (P × core age). The equations are verified against OpenMC at 7 independent points across the full SMR operating-power band (100–1000 MWth ≈ ≤300 MWe); max deviation 1.5% — tables live in the Source Term tab of the Benchmark page. Pick the nuclide to transfer.
Release Fractions
The step from inventory to source term is deliberately left to the user: enter fractions for your own accident scenario (e.g. NUREG-1465 / RG 1.183 PWR values; default 1.0 = full inventory). Q is the selected nuclide's inventory times the product of the four fractions.
Send to Model
Sending syncs the nuclide in the target model and writes the computed Q into its source-term field; location, meteorology and geometry stay yours. The Q field remains hand-editable in the target panel.