The pressurizer controls primary system pressure.
This unit is a tall, cylindrical tank typically connected at the bottom to a reactor coolant loop hot leg through 10 in. (254 mm) diameter surge line piping. Spray is introduced near the top of the pressurizer through a nozzle and 4 in. (102 mm) diameter line from a cold leg.
Three replaceable heater bundles are installed over the lower portion of the pressurizer.
Pressure relief devices are mounted at the top of the unit; these include two code safety valves and the power operated relief valve (PORV).
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