Patent ID: 6912263

Claim:
A method for feeding at least one steam generator of a pressurized water nuclear reactor with secondary feedwater, said nuclear reactor comprising a reactor coolant system in which reactor coolant for cooling the core of the nuclear reactor flows and heats the feedwater in the steam generator, the method comprising: controlling said feeding of feedwater to make a temperature and a pressure of the coolant of the reactor vary during at least one of the following phases: a phase of cooling the reactor coolant from hot shutdown conditions to a temperature and a pressure permitting start-up of a residual heat cooling system, and a phase of reheating the reactor coolant from the temperature and the pressure permitting start-up of a residual heat cooling system to hot shutdown conditions; feeding said at least one steam generator with feedwater at a controlled flow rate through at least one injector condenser of a set of at least two injector condensers having different water flow rate supply characteristics arranged in parallel; feeding at least one first inlet of said injector condenser with steam withdrawn from an upper part of said steam generator; feeding a second inlet of said injector condenser with feedwater withdrawn from a storage tank fed with feedwater from a condenser which condenses steam produced by the steam generator; supplying feedwater at controlled pressure, temperature and flow rate to the steam generator through an outlet of the injector condenser while regulating said feeding of the first and second inlets with steam and feedwater, respectively; and controlling said flow rate of feedwater feeding said steam generator to vary the pressure and temperature of the coolant by bringing into service one or more injector condensers of the set of injector condensers during one of the phases.