State how water flow is controlled through the 1st stage steam generator blowdown heat exchangers.
There is not enough pressure on startup for the water to pass through the stacked HX. The flow is controlled by a PDIC which opens a valve to the condenser. The water is pulled through the stacked HX by the vacuum from the condenser. When the delta P=3.5psid control of flow is switched over to the TIC where the water is maintained at 265F