METHOD AND DEVICE FOR VENTING THE PRIMARY CIRCUIT OF A NUCLEAR REACTOR

摘要

The process comprises filling the primary circuit (1) with water and establishing a pressure level that allows the primary pumps (15, 25, 35) to operate. A first pump (35) in a loop not connected to the circuit's pressurizer (17) is set in motion, and the gas contained in the primary circuit is evacuated to the upper part (12a) of the reactor vessel (12) by water circulated by the pump. The first pump (35) is switched off, and then the three primary pumps are switched on first successively and then simultaneously to vent the gases from the upper part of the vessel and then from the top of the pressurizer through venting ducts (2, 19, 22, 27).