Once the HP and IP bypass systems have been released the DCS will automatically
give the start up vent valves a set point which is 0.2 bar higher than the pressure
setpoint of the HP and IP bypass valves. This will cause the startup vent valves to
slowly close and the bypass valves to slowly open. When the start up vent valves are
fully closed for more than 30 seconds the bypass valves will be switched over to
pressure control and will start to control the pressurization of the HP and IP steam
lines.