Numerical Investigation of Maximum Charging Flowrates under Accident Condition in PWR Nuclear Power Plants

RCV System and RIS System are simulated with CFD software Flowmaster7.5,and the model is validated with design data.The relationship between maximum charging flowrates and Reactor Coolant System pressure is predicted by this model,when the safety injection mode switches to the charging mode after SGTR,and the relationship between the maximum charging flowrates and the corresponding Reactor Coolant Pump Seal Injection and the Pressure of Reactor Coolant System are quantitatively compared,when the charging pump is pressurized by various low voltage safety injection pumps.