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Add SCRAM matrix (DNB/subcool/SG limits) and clad split

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Codex Agent
2025-11-28 18:44:16 +01:00
parent 7ffb2a8ce0
commit def8ded816
4 changed files with 30 additions and 5 deletions
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6
src/reactor_sim/dashboard.py
View File

@@ -761,6 +761,12 @@ class ReactorDashboard:
if self.reactor.secondary_relief_open:
reliefs.append("Secondary")
lines.append(("Relief valves", ", ".join(reliefs) if reliefs else "Closed"))
lines.append(
(
"SCRAM trips",
"DNB<0.5 | Subcool<2K | SG lvl<5/>98% | SG P>15.2MPa",
)
)
return lines
def _steam_available_power(self, state: PlantState) -> float:

17
src/reactor_sim/reactor.py
View File

@@ -435,12 +435,25 @@ class Reactor:
if (not self.secondary_pump_active or state.secondary_loop.mass_flow_rate <= 1.0) and total_power > 50.0:
self._handle_heat_sink_loss(state)
if state.core.dnb_margin is not None and state.core.dnb_margin < 0.3:
# SCRAM matrix: DNB, subcooling, steam generator level/pressure
if state.core.dnb_margin is not None and state.core.dnb_margin < 0.5:
LOGGER.critical("DNB margin low: %.2f, initiating SCRAM", state.core.dnb_margin)
self.shutdown = True
self.control.scram()
if state.core.subcooling_margin is not None and state.core.subcooling_margin < 5.0:
if state.core.subcooling_margin is not None and state.core.subcooling_margin < 2.0:
LOGGER.critical("Subcooling margin lost: %.1fK, initiating SCRAM", state.core.subcooling_margin)
self.shutdown = True
self.control.scram()
elif state.core.subcooling_margin is not None and state.core.subcooling_margin < 5.0:
LOGGER.warning("Subcooling margin low: %.1fK", state.core.subcooling_margin)
if state.secondary_loop.level < 0.05 or state.secondary_loop.level > 0.98:
LOGGER.critical("Secondary level out of bounds (%.1f%%), initiating SCRAM", state.secondary_loop.level * 100)
self.shutdown = True
self.control.scram()
if state.secondary_loop.pressure > 0.95 * constants.MAX_PRESSURE:
LOGGER.critical("Secondary pressure high (%.2f MPa), initiating SCRAM", state.secondary_loop.pressure)
self.shutdown = True
self.control.scram()
failures = self.health_monitor.evaluate(
state,

10
src/reactor_sim/thermal.py
View File

@@ -119,9 +119,15 @@ class ThermalSolver:
heating = (0.002 * max(0.0, power_mw) + 0.01 * max(0.0, residual_power_mw)) * dt
cooling = 0.025 * max(0.0, core.fuel_temperature - primary.temperature_out) * dt
core.fuel_temperature += heating - cooling
# Simple clad/fuel split: clad lags fuel and is cooled by coolant.
clad = core.clad_temperature or primary.temperature_out
conduction = 0.02 * max(0.0, core.fuel_temperature - clad) * dt
clad_cooling = 0.05 * max(0.0, clad - primary.temperature_out) * dt
clad = max(primary.temperature_out, clad + conduction - clad_cooling)
core.fuel_temperature = max(primary.temperature_out, core.fuel_temperature - conduction)
# Keep fuel temperature bounded and never below the coolant outlet temperature.
core.fuel_temperature = min(max(primary.temperature_out, core.fuel_temperature), constants.MAX_CORE_TEMPERATURE)
core.clad_temperature = max(primary.temperature_out, core.clad_temperature or primary.temperature_out)
core.fuel_temperature = min(core.fuel_temperature, constants.MAX_CORE_TEMPERATURE)
core.clad_temperature = min(clad, constants.MAX_CORE_TEMPERATURE)
core.subcooling_margin = max(0.0, saturation_temperature(primary.pressure) - primary.temperature_out)
chf = self._critical_heat_flux(primary)
heat_flux = (power_mw * constants.MEGAWATT) / max(1.0, self._core_surface_area())