EMERGENCY POWER SUPPLY DEVICE AND METHOD FOR CONTROLLING A SYSTEM FOR COOLING A NUCLEAR REACTOR IN THE CASE OF A LOSS OF POWER SUPPLY FROM THE MAIN NETWORK

摘要

The invention relates to a control method for supplying power to the motor of a primary pump (120) after a loss of power supply from the main network (200) by means of an emergency electrical power supply (100), the method comprising: a phase involving supplying the electrical power to the motor of the main pump (120) by means of the emergency power supply device (100), for a first time period (P1), during said time period (P1), the emergency power supply device (100) monitors the speed of rotation of the main pump (120) and controls a gradual and linear decrease of the speed of rotation of the main pump (120); a second phase (P2) consisting of cutting off all the electrical power supply of the main pump, the deceleration of the speed of rotation of the main pump (120) during this second phase depending only on the respective inertia of the shaft of the primary pump (120).