From a2afbabe49e1805433ea4c63aa1c161bf2fc4155 Mon Sep 17 00:00:00 2001
From: Codex Agent <codex@example.com>
Date: Fri, 28 Nov 2025 19:53:26 +0100
Subject: [PATCH] Surface feedwater and governor telemetry on dashboard

---
 src/reactor_sim/dashboard.py | 23 +++++++++++++++++++++--
 1 file changed, 21 insertions(+), 2 deletions(-)

diff --git a/src/reactor_sim/dashboard.py b/src/reactor_sim/dashboard.py
index 49a4187..3c1cc7e 100644
--- a/src/reactor_sim/dashboard.py
+++ b/src/reactor_sim/dashboard.py
@@ -464,7 +464,11 @@ class ReactorDashboard:
                     "Flow",
                     f"{state.secondary_loop.mass_flow_rate:7.0f}/{self.reactor.secondary_pump.nominal_flow * len(self.reactor.secondary_pump_units):.0f} kg/s",
                 ),
-                ("Level", f"{state.secondary_loop.level*100:6.1f}%"),
+                ("Level", f"{state.secondary_loop.level*100:6.1f}% (Target {constants.SECONDARY_INVENTORY_TARGET*100:4.0f}%)"),
+                (
+                    "Feedwater",
+                    f"valve {self.reactor.feedwater_valve*100:5.1f}% steam {state.secondary_loop.mass_flow_rate * max(0.0, state.secondary_loop.steam_quality):6.0f} kg/s",
+                ),
                 ("Inlet Temp", f"{state.secondary_loop.temperature_in:7.1f} K (Target {constants.SECONDARY_OUTLET_TARGET_K:4.0f})"),
                 ("Outlet Temp", f"{state.secondary_loop.temperature_out:7.1f} K (Target {constants.SECONDARY_OUTLET_TARGET_K:4.0f})"),
                 ("Pressure", f"{state.secondary_loop.pressure:5.2f}/{constants.MAX_PRESSURE:4.1f} MPa"),
@@ -497,7 +501,15 @@ class ReactorDashboard:
                     "Units Elec",
                     " ".join([f"{t.electrical_output_mw:6.1f}MW" for t in state.turbines]) if state.turbines else "n/a",
                 ),
-                ("Throttle", f"{self.reactor.turbines[0].throttle:5.2f}" if self.reactor.turbines else "n/a"),
+                (
+                    "Governor",
+                    (
+                        f"thr {self.reactor.turbines[0].throttle:4.2f}→{self._desired_throttle(state.turbines[0]):4.2f} "
+                        f"ΔP {(state.turbines[0].load_demand_mw - state.turbines[0].electrical_output_mw):6.1f} MW"
+                    )
+                    if state.turbines
+                    else "n/a",
+                ),
                 (
                     "Condenser",
                     (
@@ -786,6 +798,13 @@ class ReactorDashboard:
             enthalpy_kjkg = (constants.STEAM_LATENT_HEAT / 1_000.0)
         return (enthalpy_kjkg * mass_flow) / 1_000.0
 
+    def _desired_throttle(self, turbine_state) -> float:
+        if not self.reactor.turbines:
+            return 0.0
+        turbine = self.reactor.turbines[0]
+        demand = turbine_state.load_demand_mw
+        return 0.4 if demand <= 0 else min(1.0, 0.4 + demand / max(1e-6, turbine.rated_output_mw))
+
     def _update_trends(self, state: PlantState) -> None:
         self._trend_history.append((state.time_elapsed, state.core.fuel_temperature, state.core.power_output_mw))