Reference No: A1716
Valve Control Unit - VCU
Main description
Along with the pressurizer heaters, the spray valve influences the primary coolant pressure in a pressurized water reactor (PWR). A spray valve with a basic open / close function is used in many plants to date. The main disadvantage of this simple open / close control is the decreased lifetime of the pressurizer components and the surge line, due to the thermomechanical stress of the spraying system.
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