AUTOMATED METHOD AND SYSTEM FOR MAINTAINING PRESSURE IN A NUCLEAR POWER PLANT PRIMARY LOOP DURING STARTUP OR SHUTDOWN

摘要

The method comprises the steps of: (a) partially filling a portion of a pressurizer vessel (10), in fluid communications with the primary loop, with a liquid for maintaining pressure in the primary loop; (b) circulating a primary coolant through the primary loop; (c) automatically injecting an inert gas by a first automated device, operatively connected to the pressurizer, into the pressurizer vessel when the pressure in the pressurizer vessel is less than a first predetermined pressure; (d) and automatically venting the gas by a second automated device, operatively connected to the pressurizer, from the pressurizer vessel when the pressure in the pressurizer vessel is greater than a second predetermined pressure.