An improved medium pressure safety injection system for nuclear power plants

Abstract

The invention relates to a nuclear-power-plant improved type medium-pressure safety injection system. The system is composed of two safety injection boxes, corresponding connecting pipelines, injection pipelines and a serial of valves. The two safety injection boxes are both connected with a nuclear-power-plant reactor coolant system via the connecting pipelines and the injection pipelines, each connecting pipeline is provided with two electric isolating valves and two inverted valves, and the electric isolating valves and the inverted valves are in serial connection. A communication pipeline is arranged between two positions, adjacent to the bottoms of the corresponding safety injection boxes, respectively on the two connecting pipelines, and is provided with an electric isolating valve. Each injection pipeline is provided with a detector used for detecting a broken port on the injection pipelines. The electric isolating valves on the two connecting pipelines are at an opening state when running is normal, and the electric isolating valve on the communication pipeline is at a closing state when running is normal. The system possesses relatively high value on safety and economy of a nuclear power plant.

Description

technical field [0001] The invention relates to nuclear power technology, in particular to a nuclear reactor safety injection system. Background technique [0002] A very important item in the special safety facilities of nuclear power plants is the safety injection system. One of the functions of the safety injection system is to inject water into the core to reflood and cool the core, limiting the temperature rise of the fuel elements. As a passive injection means, the safety injection box (generally a part of the medium pressure safety injection system) can quickly compensate for the lost coolant after a loss of water accident occurs in the primary circuit of the nuclear power plant. Each safety injection box provides 50% of the volume required to submerge the core. Whether it is a passive or active nuclear power plant, the safety injection tank is an indispensable and important source of safety injection water and means of accident mitigation. [0003] In the design o...

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Problems solved by technology

[0003] In the design of the existing medium pressure safety injection system, whether it is a two-loop or three-loop nuclear power plant, if a breach occurs on the pipeline connecting the safety injection tank and the main circuit (or even a breach occurs in the reactor coolant system), the main circuit The coolant is lost from the breach, and the breach corresponds to the loss of safety injection water in the safety injection tank. While increasing the risk of core damage, the time left for the operator to perform accident mitigation operations is relatively shortened.

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