Patent ID: 8090073
Filing Date: 2012-01-03
Classification: G21C,G21D,Y02E

Abstract:
1. A nuclear power plant comprising: a nuclear reactor; a recirculation flow control circuit configured to generate an inverter control signal to decrease a deviation of a processed value of a flow rate in the nuclear reactor from a command value; a primary loop recirculation pump motor coupled to a primary loop recirculation pump is configured to re-circulate coolant in the nuclear reactor; a bus configured to supply electrical power to the primary loop recirculation pump motor; a first circuit breaker including an input connected to the bus; a voltage source inverter, connected to an output of the first circuit breaker, electrically connected to the bus through the first circuit breaker; a second circuit breaker including an input connected to an output of the voltage source inverter and an output connected to the primary loop recirculation pump motor; an inverter control circuit configured to control the voltage source inverter on the basis of the inverter control signal, the inverter control circuit coupled between the voltage source inverter and the recirculation flow control circuit; a recirculation pump trip control circuit with an output connected to the second circuit breaker and the inverter control circuit, whereby the recirculation pump trip control circuit is configured to send a recirculation pump trip signal in response to a recirculation pump trip condition; wherein the voltage source inverter is configured to supply drive power to the primary loop recirculation pump motor through the second circuit breaker, and wherein the second circuit breaker is configured to disconnect the voltage source inverter from the primary loop recirculation pump motor in response to the recirculation pump trip signal such that the output of the voltage source inverter is open.