PROCESS FOR FILLING WITH WATER AND DISCHARGING AIR FROM THE MAIN PRIMARY MAIN CIRCUIT OF A NUCLEAR UNIT, COVER FOR THE IMPLEMENTATION OF THIS PROCESS

摘要

A process for filling water and emptying air of a main primary circuit (1) of a nuclear unit following its shutdown, said main primary circuit (1) comprising a tank (2) located in a pool of a building reactor (4), primary pumps (5), at least one steam generator (6) comprising steam generator tubes (7) located above the level of the tank (2), and a pressurizer (8) . The method comprises a step of evacuating the main primary circuit which is carried out before the tank is loaded with nuclear fuel. For this evacuation step, a lid is placed temporarily on the tank.