feat: link turbine output to transferred heat

src/reactor_sim/turbine.py

@@ -34,10 +34,12 @@ class Turbine:
         loop: CoolantLoopState,
         state: TurbineState,
         consumer: Optional[ElectricalConsumer] = None,
+        steam_power_mw: float = 0.0,
     ) -> None:
         enthalpy = 2_700.0 + loop.steam_quality * 600.0
         mass_flow = loop.mass_flow_rate * 0.6
-        shaft_power_mw = (enthalpy * mass_flow / 1_000.0) * self.mechanical_efficiency / 1_000.0
+        available_power = max(steam_power_mw, (enthalpy * mass_flow / 1_000.0) / 1_000.0)
+        shaft_power_mw = available_power * self.mechanical_efficiency
         electrical = shaft_power_mw * self.generator_efficiency
         if consumer:
             load_demand = consumer.request_power()