Primary circuit pressure-control method during the shut-down period of a pressurised water nuclear reactor.

摘要

Method for regulating the pressure of the primary circuit of a pressurized water nuclear reactor during shut-down phases, by use of an installation comprising, as a branch circuit to the primary circuit, a volume control circuit with a discharge valve and a charging valve. When the liquid level in the pressurizer approaches the top, a constant flow rate is maintained at the charging valve, the flow rate of the discharge valve is regulated by direct measurement of the primary pressure, successive sprinklings through the valve follow and the reduction in discharge flow rate is detected until further sprinkling has no further effect on the discharge flow rate.