Emergency cooling system of spent fuel pool of nuclear power station

Abstract

The invention discloses an emergency cooling system of a spent fuel pool of a nuclear power station. The emergency cooling system comprises a water intaking pipeline, a water inlet pipeline, a water intaking port, a water inlet port, a circulating cooling pump and a heat exchanger, wherein the water intaking pipeline and the water inflow pipeline are connected with the spent fuel pool, the water intaking port and the water inlet port are respectively mounted on the water intaking pipeline and the water inlet pipeline, an inlet of the circulating cooling pump is connected with the water intaking port, an outlet of the circulating cooling pump is connected with a heat side inlet of the heat exchanger, a heat side outlet of the heat exchanger is connected with the water inlet port, and then a closed cooling loop is formed. The circulating cooling pump and the heat exchanger can be powered by portable power sources. Compared with the prior art, under the working condition surpassing design basis, the emergency cooling system utilizes the circulating cooling system and the heat exchanger independent of a water source and a power source existed in the nuclear power station to conduct waste heat of fuel component in the spent fuel pool via a circulating cooling mode, guarantees immediate conduction of the waste heat of the spent fuel component, so that serious accident is avoided, and safety of the nuclear power station is effectively improved.

Description

technical field [0001] The invention relates to a safety system of a nuclear power plant, in particular to an emergency cooling system of a spent fuel pool used in nuclear power plant accident conditions. Background technique [0002] Because the fuel assembly will generate considerable decay heat for a long time, the existing pressurized water reactor nuclear power plant usually adopts a wet storage method for the spent fuel assembly, that is, the spent fuel assembly generated during the operation of the nuclear power plant, and the whole core Fuel assemblies that have not reached the depth of reprocessing burnup during unloading are stored in a special spent fuel pool, and the water is maintained to cover the fuel assembly, so that the decay heat of the fuel assembly is discharged to the final heat sink through the spent fuel pool cooling system (Oceans, rivers, atmosphere, etc.) to ensure an environment suitable for long-term storage of spent fuel assemblies, which is als...

AI Technical Summary

Problems solved by technology

However, according to the experience feedback of the Fukushima nuclear accident, in the common cause failure accident (such as tsunami, flood, etc.) of "single site multiple reactors", the cooling of the spent fuel pool will be caused by the loss of SBO power supply and the complete loss of the final heat sink (TLOCC) The system fails, which leads to the serious consequences mentioned above. The existing simple water replenishment measures are only mitigation means. Although the submersion of the fuel assembly can be maintained, the other serious consequences mentioned above still exist

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