A layout method for main water supply corridor area of ​​nuclear power plant

Abstract

The invention relates to the field of overall layout design of a nuclear power plant, in particular to a method for arranging a main water supply corridor area of ​​a nuclear power plant. Including the main water supply corridor area set in the nuclear island electrical power plant, outside the nuclear island containment, and three loop main water supply pipelines that run through the nuclear island containment. Each loop main water supply pipeline is arranged with a main pipeline and a Bypass pipeline, the tail end of the main pipeline runs through the nuclear island containment through the penetrating piece, and the first safety NC level isolation valve, the first regulating valve, the first safety two stage isolation valve, main feedwater check valve; the top of the bypass pipeline is connected near the top of the main pipeline, and the tail end of the bypass pipeline is connected between the main feedwater check valve and the first safety secondary isolation valve of the main pipeline The position between; the second safety NC level isolation valve, the second regulating valve, and the second safety secondary isolation valve are arranged in sequence from the top to the end of the bypass pipeline. This method can reduce the overpressure of the nuclear island containment.

Description

technical field [0001] The invention relates to the field of overall layout design of a nuclear power plant, in particular to a method for arranging a main water supply corridor area of ​​a nuclear power plant. Background technique [0002] The main feedwater flow control system of the nuclear power plant effectively cuts off the main feedwater through the isolation valve, and the regulating valve adjusts the flow rate to ensure that the main feedwater is effectively isolated and controlled during accident conditions, preventing overpressure of the containment vessel and avoiding overflow of the steam generator. The existing technology is to arrange the regulating valve and the isolation valve group in the conventional island plant, and the flow-limiting orifice plate is arranged in the nuclear island electrical plant, and the layout space has enough margin. However, the conventional island plant does not belong to the anti-seismic Class I structure, so there is a risk of fa...

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Problems solved by technology

However, the conventional island plant does not belong to the anti-seismic Class I structure, so there is a risk of failure of the control valve and isolation valve group under the superimposed earthquake condition

[0003] Moreover, when the main water supply pipeline of the existing nuclear power plant breaks, the spraying action of the high-temperature and high-pressure medium will cause the pipeline to slam. Without restraint on the slamming pipeline, it is easy to cause secondary hazards and endanger important safety items.

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