Shutdown cooling system safety feed system

摘要

A nuclear plant safety feed system and method of minimizing pump cavitation or near cavitation from entrained air or other flow volume anomaly in a shutdown cooling system drain pump (33) of a nuclear power plant (10) during midloop operation where the plant includes a horizontal hot leg (18) having a shutdown cooling drain pipe (28) connected from the lower region thereof to a pump which system includes providing a reservoir (54) and make-up pipe (52) having a controller (42) modulated and controlled valve (50) to provide make-up coolant to the shutdown cooling drain pipe upstream of the shutdown drain pump in the event the sensors detect low coolant level in the hot leg or cavitation, near cavitation or a flow volume anomaly and sends a valve opening signal to the valve through the controller.