Separate cooling structure for users of cooling water system of nuclear power plant equipment

Abstract

The invention provides a series dividing and cooling framework of common users of a nuclear power plant equipment cooling water system. The series dividing and cooling framework comprises two cooling series and the multiple common users to be cooled, wherein the cooling series are isolated from each other and independent of each other, and the common users comprise at least one redundant cooling user and at least one cross cooling user; the redundant cooling user is provided with two sets of heat-exchange devices cooled through the different cooling series, a heat-exchange device of the cross cooling user is selectively cooled by the first cooling series or the second cooling series. Compared with the prior art, the two cooling series which are isolated from each other and independent of each other are used for cooling the common users in different modes, not only is overdependence on an RRI system common loop avoided, but also common user isolating valves between series are omitted, and the failure probability of an RRI system is greatly reduced; meanwhile, it is ensured that when one single cooling series fails, the redundant cooling user and the cross cooling uses can be cooled continuously and sufficiently.

Description

technical field [0001] The present invention relates to the cooling of common users of the cooling water system of nuclear power plant equipment, more specifically, the present invention relates to a highly reliable cooling structure for common users of the cooling water system of nuclear power plant equipment. Background technique [0002] The equipment cooling water system (Component cooling water system, RRI system) provides cooling for various heat exchangers (including motors) in the nuclear island of the nuclear power plant, and transfers the heat to the final heat transfer system through the SEC system (Essential service water system, important plant water system). Trap the sea. The RRI system forms a barrier between each heat exchanger of the nuclear island and the seawater to prevent the uncontrollable release of radioactive fluid into the seawater, and avoid problems such as corrosion and fouling of each nuclear island heat exchanger due to the use of seawater for ...

AI Technical Summary

Problems solved by technology

This switching method often leads to short-term crossover between RRI system series, and the public users of the RRI system will inevitably have a short-term low cooling water flow during the action of the isolation valve between series (about 30 to 60 seconds), which may Cause some public users to be unavailable for a short time (for example, the APG system will cause protection action due to low cooling water flow for a short time)

Moreover, since each safety series is connected to the public user water supply main pipe through double isolation valves between series, the safety series switching process requires the coordination of isolation valves between series in groups, and any failure of any of the four isolation valves will It leads to the failure of the safety series switching, which makes the cooling of the public users abnormal and affects the normal power generation of the unit

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