Boron-untrusted controlling method for criticality safety of spent fuel pool framework

A technology for spent fuel pool and criticality safety, which is applied in the fields of reactor fuel elements, reactors, and greenhouse gas reduction, can solve problems such as insufficiency, and achieve the effect of high-density storage

Active Publication Date: 2013-04-24
CHINA NUCLEAR POWER ENG CO LTD
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  • Abstract
  • Description
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AI Technical Summary

Problems solved by technology

"According to this, the current design of zone II of my country's spent fuel storage pool does not meet the requirements of this standard.

Method used

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  • Boron-untrusted controlling method for criticality safety of spent fuel pool framework
  • Boron-untrusted controlling method for criticality safety of spent fuel pool framework
  • Boron-untrusted controlling method for criticality safety of spent fuel pool framework

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Embodiment Construction

[0013] The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.

[0014] When conducting critical safety design and analysis of spent fuel storage pools, normal storage conditions and accident storage conditions must be considered, and it is required to satisfy k eff Less than the safety limit of 0.95. The accident conditions considered mainly include: the density of boron water in the pool water decreases due to the increase of temperature; The position of the storage grid and the reduction of the spacing between the grids caused by the earthquake accident.

[0015] Taking Zone II of an M310 reactor-type spent fuel storage pool as an example, the overall layout of the grid in this zone is shown in figure 1 As shown, the storage grid uses boron steel as the solid neutron poison, and the storage unit adopts an L-shaped arrangement, and the spent fuel storage spacing is 240mm. Under normal working conditions, the s...

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Abstract

The invention relates to a boron-untrusted controlling method for criticality safety of a spent fuel pool framework. Isolation regions are arranged around the spent fuel pool framework so as to prevent increase of reactivity caused by falling-off of a fuel assembly, and storage space of spent fuel assemblies is increased to reduce reactivity of a whole system. With such a technical scheme provided by the invention, under normal and credible accident working conditions, a spent fuel storage pool can realize high density storage in virtue of addition of solid neutron poison and combustion of trusted spent fuel assemblies while guaranteeing criticality safety, without trusting of soluble boron in water at the same time.

Description

technical field [0001] The invention relates to a criticality safety control method for a reactor or an off-reactor spent fuel storage facility, in particular to a boron-untrusted spent fuel pool grid criticality safety control method. Background technique [0002] At present, my country's spent fuel storage facilities on or off the stack generally adopt the wet storage method. A certain number and a certain form of storage grids are placed in the spent fuel pool, and the spent fuel assemblies are placed in the storage grids to adjust the storage distance. , placing neutron poisons and other means to ensure the subcritical safety of the spent fuel pool. In order to adapt to the characteristics of high initial enrichment and high burnup capacity of the currently stored spent fuel assemblies, and to meet the economic requirements of nuclear power plants, under the premise of ensuring nuclear safety, the spent fuel storage pool uses high-density storage way of management. Usua...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G21C19/07
CPCY02E30/30
Inventor 易璇霍小东杨海峰邵增
Owner CHINA NUCLEAR POWER ENG CO LTD
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