Abstract
This paper provides an optimization scheme for the steam chamber of the pressurizer of the nuclear power unit. The scheme includes: if the operation information of the pressurizer meets the triggering conditions of the chamber, raise the charging flow and increase the discharge flow of the RCV system; Adjust the opening of the low-pressure control valve according to the measured pressure downstream of the letdown orifice; Close the connection control valve; If the discharge flow drops to the first preset flow, reduce the opening of the low-pressure control valve; Control the pressurizer to reduce the rising speed of charging flow; If the discharge flow drops to the second preset flow, stop the opening measurement adjustment of the low-pressure control valve and increase the opening measurement of the connecting control valve; If the letdown flow rises to the third preset flow, stop the opening adjustment of the connecting control valve, reduce the charging flow to the fourth preset flow, and control the pressurizer to perform cavity building operation. The method can effectively control the temperature rise of the fluid and the charging speed exceeding 107 °C. The service life of the nuclear power unit is improved, and the design of increasing the letdown flow to the third preset flow and reducing the charging flow to the fourth preset flow makes the letdown flow and charging flow meet the flow state of the pressurizer cavity, and ensures the stability of the pressurizer cavity establishment.
