Passive water replenishment and heat export system for spent fuel pool

Abstract

The invention discloses a passive water replenishment and heat export system for a spent fuel pool. The system comprises a cooling pool, a loop heat pipe system, and a spray system, wherein the cooling pool is arranged above the spent fuel pool; one end of the loop heat pipe system is arranged in the spent fuel pool, and the other end of the loop heat pipe system is arranged in the cooling pool; a condensing medium is arranged in the loop heat pipe system; the spray system is arranged between the spent fuel pool and the cooling pool, is communicated with the cooling pool, and comprises water orifices and spray start valves used for the connection or disconnection of the cooling pool and the water orifices. The system has the advantages that through the loop heat pipe system, heat in the spent fuel pool can be transmitted into the cooling pool through the condensing medium, so that heat dissipation of spent fuels is facilitated; meanwhile, through the spray system, a cooling agent in the cooling pool can be sprayed into the spent fuel pool for passive water replenishment when spent fuel assemblies are exposed due to an excessively low liquid level of the spent fuel pool, so that the safety of the spent fuel assemblies is guaranteed.

Description

Technical field [0001] The invention relates to a safety system of a nuclear power plant, in particular to a passive water replenishment and heat export system for a spent fuel pool. Background technique [0002] The use of nuclear power is a major breakthrough in the history of human energy utilization. Using the fission reaction of atomic nuclei, nuclear fuel can produce high energy output unmatched by all other traditional fossil energy sources, and these high energy outputs often require only a small amount of nuclear fuel. This feature of low input and high output has made mankind pay more and more attention to the use of nuclear energy and continuously increase research and development in the field of nuclear energy. Today, nuclear energy has become an important energy component of many countries in the world. [0003] However, while nuclear power has extremely high utility value, its possible harm also makes people talk about nuclear discoloration. In the process of using n...

AI Technical Summary

Problems solved by technology

However, the spent fuel pool cooling system in the prior art generally relies on active equipment to operate, and the active equipment needs to be activated by the main power supply or emergency power supply of the nuclear power plant. If there is no power supply and the cooling system cannot be started, the heat generated by the spent fuel will not be released, which will cause the temperature in the spent fuel pool to continue to rise, the coolant will boil and evaporate, and the spent fuel building will be filled with high-temperature gas. Accident handling is hindered. At the same time, the evaporation of coolant (or other reasons for water loss) leads to a drop in liquid level, and the spent fuel assembly loses cooling because it is exposed to the coolant, and even breaks, increasing the risk of radioactive material release.

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