Supplementary cooling device for spent fuel pool of nuclear power plant

Abstract

The invention discloses a supplementary cooling device for a spent fuel pool of a nuclear power plant. The device comprises a first loop which is positioned in a nuclear island plant building, and a second loop which is positioned outside the nuclear island plant building, wherein water in the spent fuel pool can circularly flow in the first loop; the heat is conveyed to the second loop through the first loop by utilizing an intermediate heat exchanger; heat of the fluid in the second loop is dissipated through a cooling tower. Compared with the prior art, the device has the advantages that adouble-loop cold chain is designed to limit the spent fuel pool into the nuclear island plant building, so that radioactive substances can be prevented from leaking from the nuclear island plant building by accident, and as a result, the safety and the reliability of the device are improved, and the cooling capacity of the spent fuel pool can be obviously improved; meanwhile, a double-die power supplying manner is adopted, and an independent hot trap is additionally arranged, so that the emergency treatment capacity of the spent fuel pool to whole-plant power-off accident and hot trap losing accident can be improved.

Description

technical field [0001] The invention belongs to the field of nuclear power, and more specifically, the invention relates to a supplementary cooling device for a spent fuel pool of a nuclear power plant. Background technique [0002] The spent fuel pool in nuclear power plants is used to store spent fuel assemblies discharged from the core during refueling. The spent fuel assembly generates a certain amount of decay heat in the spent fuel pool, which needs to be cooled by the spent fuel pool cooling system to maintain the water temperature of the spent fuel pool below a certain temperature. Suppress the boiling of the spent pond water, prevent the spent pond water from evaporating, and the fuel components exposed and melted, causing a large amount of radioactive substances to leak out. [0003] In PWR nuclear power plants, the disclosed spent fuel pool cooling systems such as figure 1 As shown by the dotted line, it consists of two columns of cooling subsystems, and each co...

AI Technical Summary

Problems solved by technology

Under the new refueling mode, the decay heat load of the fuel assemblies in the spent fuel pool is higher, and the cooling capacity of the original cooling system cannot meet the requirements of the new refueling mode, and the nuclear power plant can only be used when the cooling water temperature is lower (lower than the design reference temperature Refueling is carried out in winter in a certain range), and the refueling operation strategy and the normal operation of nuclear power plants are greatly affected

[0005] In addition, the heat removal of the disclosed spent fuel pool cooling system relies on the cold chain of "equipment cooling water / sea water". The cooling of the water pool will be interrupted immediately. If the water in the spent pool boils for a long time, some equipment in the spent fuel plant will be damaged, and some radioactive substances will leak out, affecting the personal safety of the public.

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