Underground storage silo for storing nuclear power plant fuel storage tank

Abstract

The present invention discloses an underground storage silo for storing a nuclear power plant fuel storage tank, and aims to overcome or alleviate the shortcomings of being unsafe, large in land space, and the like of ground fuel storage tanks in the prior art, the underground storage silo comprises at least one underground shield chamber, a chamber sealing cover, a plurality of heat pipes and at least one protection grid net; the shielded underground chamber is disposed below ground, the shielded underground chamber is used for receiving the fuel storage tank; the chamber sealing cover is used for covering the top of the chamber to shield upward radiation; the plurality of heat pipes pass through the chamber chamber sealing cover and are inserted in the chamber, the plurality of heat pipes are arranged to surround the fuel storage tank, and are used for absorbing heat released by the fuel storage tank and releasing the heat into the external environment; the protection grid net is used for isolation protection of the heat pipe ground sections. The fuel storage tank is overall enclosed in the underground storage chamber, no flooding by water, overturning by earthquakes and other conditions occur, meanwhile silo function failure caused by flooding by water, overturning by earthquakes and other conditions can be avoided, and the storage safety of the fuel storage tank can be greatly improved.

Description

technical field [0001] The invention relates to the technical field of nuclear power plant spent fuel dry storage, in particular to an underground storage silo for storing nuclear power plant fuel storage tanks. Background technique [0002] At present, the dry storage of spent fuel generally uses concrete vertical silos or concrete horizontal modules for storage. First, the spent fuel components are packaged and welded in a closed metal fuel storage tank, and then the fuel storage tank is loaded into the concrete vertical silo for storage. Store vertically, or load into concrete horizontal modules for horizontal storage. [0003] The above storage methods are all ground storage, and at least there are the following deficiencies or defects: [0004] 1) In order to effectively shield the gamma and neutron radiation of spent fuel assemblies, it is necessary to set a thicker shielding concrete shielding layer on the ground, and concrete vertical silos or concrete horizontal mo...

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Problems solved by technology

[0004] 1) In order to effectively shield the gamma and neutron radiation of spent fuel assemblies, it is necessary to set a thicker shielding concrete shielding layer on the ground, and concrete vertical silos or concrete horizontal modules store fuel storage tanks on the ground, so it will occupy There is a large space above the ground, and it is relatively easy for people to access the fuel storage tank body on the ground. It is necessary to set up multiple safety protection facilities to prevent terrorist attacks, and the construction cost is relatively high.

[0005] 2) In order to ensure the heat release of spent fuel inside the passive export fuel storage tank, it is necessary to set up an air intake channel and an exhaust channel at the bottom of the concrete vertical silo and the concrete horizontal module, and to An annular convection channel is set between them to ensure sufficient natural air convection in the concrete vertical silo or concrete horizontal module to cool the fuel storage tank, and the manufacturing process is complex

[0006] 3) In the event of an earthquake, etc., the concrete vertical silo may overturn, posing safety hazards

[0007] 4) In some accident situations, when the natural air convection channels of the concrete vertical silo and the horizontal module are blocked, the natural air convection heat conduction will not be formed, and the temperature of the spent fuel components inside the fuel storage tank will increase , exceeds the allowable value of the regulations, and accident conditions occur

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