Handle heat-sink loss and update turbine controls

tests/test_simulation.py

@@ -37,7 +37,7 @@ def test_health_monitor_flags_core_failure():
     reactor = Reactor.default()
     state = reactor.initial_state()
     state.core.fuel_temperature = constants.MAX_CORE_TEMPERATURE
-    failures = reactor.health_monitor.evaluate(state, True, True, [True, True, True], dt=200.0)
+    failures = reactor.health_monitor.evaluate(state, True, True, [True, True], dt=200.0)
     assert "core" in failures
     reactor._handle_failure("core")
     assert reactor.shutdown is True
@@ -52,3 +52,16 @@ def test_maintenance_recovers_component_health():
     assert restored is True
     assert pump.integrity == pytest.approx(0.8)
     assert pump.failed is False
+
+
+def test_secondary_pump_loss_triggers_scram_and_no_steam():
+    reactor = Reactor.default()
+    state = reactor.initial_state()
+    # Make sure some power is present to trigger heat-sink logic.
+    state.core.power_output_mw = 500.0
+    reactor.secondary_pump_active = False
+    reactor.control.manual_control = True
+    reactor.control.rod_fraction = 0.1
+    reactor.step(state, dt=1.0)
+    assert reactor.shutdown is True
+    assert all(t.electrical_output_mw == 0.0 for t in state.turbines)