Grouped pneumatic lifting system and method for pebble-bed reactor fuel elements

Abstract

The invention provides a grouped pneumatic lifting system and method for pebble-bed reactor fuel elements. The system comprises a plurality of groups of burnup detection assemblies, a feeder, a lifting pipeline, a gas diverter and a fluid power plant. The number of inlets of the feeder is identical to the number of the burnup detection assemblies; the feeder has an outlet, a fuel element is let out from the outlet of the feeder at a preset time interval, and at least two fuel elements are allowed to form a queue in the lifting pipeline and to be lifted at the same time. The grouped pneumatic lifting system and method can realize grouped lifting of fuel elements into a reactor core; the number of fuel elements in each group and spacing among the fuel elements are controllable, and under different working conditions, lifting capability can be optimized, conveying efficiency can be improved and energy consumption can be reduced; the grouped pneumatic lifting system and method only employs one lifting pipeline and has the advantages of a simple structure, low cost for manufacture, maintenance and utilization and applicability to construction and operation of pebble-bed reactors.

Description

technical field [0001] The patent of the invention belongs to the technical field of pebble bed nuclear reactor fuel delivery, and in particular relates to the design of a group pneumatic lifting system and method for pebble bed reactor fuel elements. Background technique [0002] The modular pebble bed high-temperature gas-cooled reactor is the fourth generation of new nuclear reactor currently being researched and developed, and is recognized by the nuclear energy industry as the most secure nuclear reactor type. This stack type utilizes the gas lift method to realize the circular operation mode in which spherical fuel elements pass through the core multiple times. The fuel cycle capacity, that is, the maximum number of fuel elements that pass through the cross-section of the core per unit time, is an important operating index of the reactor type. The average fuel consumption is also higher. Pneumatic lifting of fuel elements is a key link in the fuel cycle of pebble bed...

AI Technical Summary

Problems solved by technology

However, when this technology is used, at most one fuel element occupies the delivery pipeline at the same time, the fuel element delivery efficiency is low, and the lifting capacity cannot be adjusted quickly and in a wide range according to different working conditions, resulting in the accuracy of reactor control and the economy of operation. Both are greatly restricted, and in order to meet the requirements of fuel cycle capacity, multiple lifting pipes need to be arranged in parallel, the system is complicated, and the manufacturing, maintenance and use costs are high

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