Passive water supplementation spraying system of spent fuel pool

Abstract

The invention belongs to the technical field of circulating cooling of nuclear power plants and in particular relates to a passive water supplementation spraying system of a spent fuel pool. A spraying pipeline is suspended above the spent fuel pool; sprayers are arranged on the spraying pipeline; an outlet is formed in the bottom of a water supplementation tank which is connected with the spraying pipeline through a pipeline; a fixed net rack is arranged in the spent fuel pool; a hollow rod is arranged in the net bracket; a pipe plug is arranged at the outlet in the bottom of the water supplementation tank; a bearing line bypasses pulleys; two ends of the bearing line are respectively connected with the hollow rod and the pipe plug. The system can be used in most existing wet type storage spent fuel pools in the nuclear power plants and can run under the condition of severe accidents without pushing of power; by the adoption of a passive security technology, the system of the nuclear power plant can automatically recover to a security state, so that the security of the nuclear power plant can be greatly improved.

Description

technical field [0001] The invention belongs to the technical field of circulating cooling of nuclear power plants, and in particular relates to a passive replenishing water spraying system for spent fuel pools. Background technique [0002] There are two types of spent fuel pools, one for dry storage and one for wet storage. Most of the current pressurized water reactor nuclear power plants are stored in wet mode, and the coolant is low-concentration boron-containing water. Wet storage spent fuel pool is introduced by taking AP1000 as an example. [0003] AP1000 spent fuel pool / storage grid (Spent Fuel Pool / Racks) provides storage space for spent fuel, with a length of about 11.6m, a width of about 5.9m, and a depth of about 52.4ft (13m). It is made of reinforced concrete and concrete filling structure It is composed of modules, and the part in contact with the pool water is made of stainless steel lining. If the structure is reinforced concrete, the surface needs to be i...

AI Technical Summary

Problems solved by technology

[0010] The existing cooling systems for cooling the spent fuel pool need to use pumps and electric power to provide power for circulation. When the power failure of the whole plant or a more serious earthquake accident occurs, the lack of pump power leads to the loss of cooling of the spent fuel pool. Continuous release of decay heat, leading to water level drop in spent fuel pools, exposure of spent fuel components and other accidents endangering public safety

For example, during the Fukushima nuclear accident, under a series of serious accidents such as earthquake, loss of off-site electricity, and insufficient power of diesel generators, the existing cooling system of the spent fuel pool cannot guarantee the normal cooling of the spent fuel pool, and even the evaporation of spent fuel pool water and the loss of spent fuel pool occurred. The fuel rods were exposed, leading to nuclear leakage, causing public panic and even endangering public safety

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