Pebble bed high temperature pile ball flow pipeline locker

Abstract

The invention relates to a ball flow pipeline locker of a pebble bed high temperature reactor. The locker is arranged outside a ball run-through joint pipe and comprises a bearing shell, a locking shaft and a jacket, wherein one end of the bearing shell is connected with the ball run-through joint pipe, the internal space of the bearing shell is communicated with the ball run-through joint pipe, and the other end of the bearing shell is provided with a seal head; the locking shaft is arranged in the internal space of the bearing shell and an inner magnet assembly is arranged outside one end of the locking shaft; the jacket is sleeved outside the bearing shell; and an outer magnet assembly matched with the inner magnet assembly is arranged between the outer surface of the jacket and the inner surface of the bearing shell. The locker provides locking power and realizes isolation of atmosphere and pressure inside and outside equipment by means of synchronous movement of the inner and outer magnetic materials; the locker meets the requirement that the balls pass through the pipe smoothly without accident under normal ball flow circulation; and the locker effectively locks partial ball flow pipeline so as to safely and reliably prevent a fuel element from moving downwards continuously when downstream conveying and converting equipment is blocked by the balls.

Description

technical field [0001] The invention relates to a locker for a ball flow pipeline of a pebble bed high temperature reactor fuel loading and unloading system, which belongs to the field of reactor equipment. Background technique [0002] The fuel used in the high-temperature gas-cooled reactor nuclear power plant demonstration project (HTR-PM) is a spherical element with a diameter of 60 mm. The spherical fuel elements are loosely stacked in the core. , Multiple cycles of the core. During normal operation of the reactor, graphite balls flow from top to bottom in the reactor core and unloading pipe by gravity, and enter the fuel element after being sorted and singled out by the integrated unloading device at the lower end of the core unloading pipe Circulating ball flow pipeline. In the ball flow pipeline, the fuel elements also need to undergo a series of transportation conversion and burnup measurement. The elements that have not reached the target burnup depth will enter ...

AI Technical Summary

Problems solved by technology

Due to the particularity of the structure of the transfer conversion equipment, fuel elements may be jammed in the equipment

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