Residual heat removal facility for spent fuel shipping flask

Abstract

The invention discloses a residual heat removal facility for a spent fuel shipping flask. The residual heat removal facility for the spent fuel shipping flask comprises a water filling loop, an air inflation loop, a gas-water discharging loop, a gas-water separator and a gas exhausting loop, wherein the water filling loop and the air inflation loop share one three-way valve and then are sequentially connected with the gas-water discharging loop, a cooling system, the gas-water separator and the gas exhausting loop by virtue of a pipeline. The residual heat removal facility for the spent fuel shipping flask can independently complete functions such as water filling and boron dissolution, water filling and exhausting, circulation cooling, cooling of exhausted gas, steam-water separation, air filtration and water drainage from a container, and single equipment can meet residual heat removal technological requirements of the spent fuel shipping flask. The residual heat removal facility for the spent fuel shipping flask is added with a water filling and boron dissolution technology in use; and the technology is used for dissolving boron crystals in the loop and preventing the loop from being blocked, so that the technology is more complete. The residual heat removal facility for the spent fuel shipping flask adopts an immersion heat exchange method, a heat exchange component is directly immersed into an immersion heat exchanger, heat exchange effect is good, and structure is simple.

Description

Technical field [0001] The invention relates to a spent fuel transportation process in a pressurized water reactor nuclear power plant, in order to ensure the safe discharge of the spent fuel assembly from the container, cooling the container, replacing gas and forming a shielded spent fuel transportation container waste heat discharge device. Background technique [0002] my country adopts the strategy of "closed nuclear fuel cycle". The spent fuel of nuclear power plants is temporarily stored in the fuel plant for 5 to 10 years. As the high-level radioactive materials in the components decay and the decay heat decreases, it is transported to the reprocessing plant for intermediate storage, processing and recovery. The uranium and plutonium in the spent fuel assembly also frees up the limited storage space in the pool to meet the operational requirements of nuclear power plants. [0003] At present, my country's spent fuel intermediate storage capacity and disposal capacity are ins...

AI Technical Summary

Problems solved by technology

[0003] At present, my country's spent fuel intermediate storage capacity and disposal capacity are insufficient. CNNC No. 404 Plant is the only unit in China that can receive spent fuel components from commercial nuclear power plants. The original two pools with a total capacity of 500 tons are full, and the newly built 800-ton pool is not enough for earthquake resistance. The requirements cannot be operated; my country's reprocessing technology is still in the scientific research stage, and the large-scale commercial nuclear fuel reprocessing plant that introduces foreign technology is expected to be put into operation in 2030

[0004] In 2013, the fuel pools of units 1 and 2 of the Daya Bay Nuclear Power Plant were close to full capacity, but the reprocessing plant was unable to receive spent fuel assemblies due to capacity limitations, and the nuclear power plant was facing shutdown, which would bring huge economic losses and social impact

[0005] The existing discharge cooling device requires a special cooling water circulation and filtration circuit. The equipment is relatively complicated, and more radioactive waste will be generated during use. At the same time, there is a lack of filter status monitoring and process monitoring data is incomplete.

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