Efficient operation PCS long-term cooling water tank

Abstract

The invention provides an efficient operation PCS long-term cooling water tank. The PCS long-term cooling water tank is mainly composed of an outer-layer concrete shell, an inner-layer steel water tank and an efficient heat exchange parallel flow channel between the outer-layer concrete shell and the inner-layer steel water tank. The flow channel is formed by separation of an S-shaped vertical folded plate installed on the outer surface of the steel water tank, the bottom of the concrete shell serves as an inlet, and the top of the concrete shell serves as an outlet. And the outlet header pipe extends outwards to form a chimney structure. A plurality of large-pipe-diameter corrugated pipes penetrating through the upper surface and the lower surface of the water tank are arranged in the steel water tank. The efficient operation PCS long-term cooling water tank is applied to the PCS starting and long-term operation process under the condition of reactor water loss accidents, and passive air natural circulation with considerable flow speed is formed in the parallel flow channels by utilizing the high temperature of the outer surface of the steel water tank and the chimney effect; and efficient heat transfer of the outer surface of the water tank is achieved by means of reinforced heat transfer such as corrugated pipe. The process promotes long-term operation of the PCS system by reducing the water temperature of the PCS cooling water tank or reducing evaporation of water in the water tank.

Description

technical field [0001] The invention relates to a passive safety protection facility of a nuclear power plant, which refers to a cooling water tank of a passive heat export system of a containment shell, in particular to a PCS long-term cooling water tank with high-efficiency operation. Background technique [0002] Since the end of the last century, the proportion of passive safety measures in nuclear power systems has gradually increased. Taking AP1000 as an example, its passive safety systems include passive core cooling system (PXS), passive containment cooling system (PCS), Passive residual heat removal system (PRHRS), main control room emergency habitability system (MCRHS), containment isolation system (CIS), the existence of these systems enables the reactor to reduce the operation of external staff and external personnel after an accident. The dependence on energy supply simplifies engineering safety measures, reduces manufacturing costs, and achieves a better balanc...

AI Technical Summary

Problems solved by technology

However, installing a heat exchanger inside the water tank will increase the resistance of air flow, which is not conducive to the improvement of the circulation flow of the system; in addition, the exposed water tank outside the containment ignores the effect of the sun on the heating of the water tank, and the cooling of the water tank by the wind speed in the atmospheric space Changes in the impact of the concrete shell against external attack

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