diff --git a/src/reactor_sim/reactor.py b/src/reactor_sim/reactor.py
index 330eaaf..df22806 100644
--- a/src/reactor_sim/reactor.py
+++ b/src/reactor_sim/reactor.py
@@ -258,7 +258,7 @@ class Reactor:
                 pump_state.pressure = self._ramp_value(
                     pump_state.pressure, state.primary_loop.pressure, dt, self.primary_pump.spool_time
                 )
-                pump_state.status = "STOPPING" if pump_state.flow_rate > 0 else "OFF"
+                pump_state.status = "STOPPING" if pump_state.flow_rate > 1.0 else "OFF"
         if self.secondary_pump_active:
             total_flow = 0.0
             target_pressure = 12.0 * 0.75 + 2.0
@@ -306,7 +306,7 @@ class Reactor:
                 pump_state.pressure = self._ramp_value(
                     pump_state.pressure, state.secondary_loop.pressure, dt, self.secondary_pump.spool_time
                 )
-                pump_state.status = "STOPPING" if pump_state.flow_rate > 0 else "OFF"
+                pump_state.status = "STOPPING" if pump_state.flow_rate > 1.0 else "OFF"
 
         self.thermal.step_core(state.core, state.primary_loop, total_power, dt)
         if not self.secondary_pump_active or state.secondary_loop.mass_flow_rate <= 1.0: