Passive containment shell condensed water injection system

Abstract

The invention relates to a passive containment shell condensed water injection system. The system comprises a first water collecting device; a first condensed water injection pipeline, which is connected to the first water collecting device and a pressure container direct injection pipeline; and a first valve mechanism, which is arranged on the first condensed water injection pipeline and is capable of starting the condensed water injection and controlling the condensed water injection flow after receiving a severe accident signal. The first water collecting device comprises a first water collecting groove, which is arranged along the circumferential direction of the internal wall of a containment shell. The first water collecting groove is arranged above the reactor core, and the standard distance between the first water collecting groove and the reactor core is 40% to 75% of the total height of the containment shell. When a severe accident happens, the system can utilize the pressure due to the height difference between the water collecting groove and the reactor core to completely inject the condensed water into the reactor core to ensure the safety of the reactor. Moreover, the system also can collect the condensed water from the internal wall of the containment shell and directly injects the collected condensed water into the reactor core to cool the melts in the reactor core. The system has the advantages of simple structure, high reliability, and suitability for various kinds of nuclear power stations.

Description

technical field [0001] The invention relates to nuclear reactor safety design technology, in particular to a passive containment condensate water injection system for cooling reactor core melt in severe accidents. Background technique [0002] In the design of nuclear power plants, nuclear safety is the primary issue to be considered. The AP series nuclear power technology of Westinghouse Corporation of the United States benefits from its modular construction technology, simplified system design and comprehensive application of passive technology. In the existing design of the AP series nuclear power plant of the Westinghouse Corporation of the United States, in the event of a loss of water accident in the reactor or a rupture of the steam pipe, the steam ejected from the breach will condense on the inner wall of the steel containment vessel, and the condensed water will be condensed under the action of gravity , flowing down the inner wall of the container. Between the to...

AI Technical Summary

Problems solved by technology

However, with the continuous increase of reactor power (such as CAP1700 or even higher), the formation and stratification mechanism of the core melt pool is not fully understood at present, and the cooling of the core melt only relies on the strategy of IVR-ERVC, and the pressure vessel The failure has great uncertainty, so the safety of the reactor will also have certain risks

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