Water inlet system suitable for caisson type marine nuclear power station under emergency condition

Abstract

The invention discloses a water inlet system suitable for a caisson type marine nuclear power station under an emergency condition. The water inlet system comprises a control mechanism and an executing mechanism, wherein the control mechanism comprises a temperature-sensing element, a control circuit and an electromagnetic valve I which are in electric connection in sequence; the temperature-sensing element is used for monitoring temperature of a caisson of the nuclear power station, when the temperature is greater than a preset value, the control circuit is controlled to be communicated, and then the electromagnetic valve I is controlled to be opened; the executing mechanism comprises a water inlet valve driving pipeline and at least one water inlet valve connected with the water inlet valve driving pipeline, and the water inlet valve is arranged on the caisson; the electromagnetic valve I is connected with the water inlet valve driving pipeline, and controls the communication of the water inlet valve driving pipeline. The water inlet system has the advantages that (1) the temperature-sensing element is adopted, an emergency water inlet system can be triggered quickly and directly, and slow response of the system is avoided; (2) a sea-water battery is prepared as a power source, so that after a main power source is invalid, the reliability of the system is ensured; (3) the water inlet valve is driven by air pressure or hydraulic pressure, so that the problem that electric drive can be invalid is further avoided, and then the stability of system operation is improved.

Description

technical field [0001] The invention relates to a water inlet system suitable for emergency situations in caisson-type offshore nuclear power plants, and belongs to the technical field of offshore nuclear power safety. Background technique [0002] The failure of nuclear power plants to cool down in time often leads to catastrophic consequences. Let’s take the Fukushima nuclear power plant leakage accident as an example to understand the process of the accident, so as to avoid the causes of nuclear accidents and improve nuclear safety. [0003] Because the intensity of the earthquake exceeded the seismic limit of the Fukushima nuclear power plant. After the earthquake, the control rods in the reactor were inserted and the reactor was automatically shut down. However, the remaining heat needs to continue to be transferred and released after the shutdown, but the external power supply grid was damaged by the earthquake and could not supply power. At this time, the emergency b...

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Problems solved by technology

[0004] From the process of the Fukushima nuclear power plant accident, we can see the insufficiency of its emergency water intake system: emergency backup diesel generators are easily damaged due to earthquakes and other reasons; backup battery maintenance time is short; seawater cooling is not timely, and the adjustment process is lagging, etc.

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