Add spool dynamics for pumps and turbines

src/reactor_sim/coolant.py

@@ -5,6 +5,7 @@ from __future__ import annotations
 from dataclasses import dataclass
 import logging
 
+from . import constants
 from .state import CoolantLoopState
 
 LOGGER = logging.getLogger(__name__)
@@ -14,6 +15,7 @@ LOGGER = logging.getLogger(__name__)
 class Pump:
     nominal_flow: float
     efficiency: float = 0.9
+    spool_time: float = constants.PUMP_SPOOL_TIME
 
     def flow_rate(self, demand: float) -> float:
         demand = max(0.0, min(1.0, demand))