Discharging thimble tube of mixed oxide fuel assembly, comprises installing plate with openings in fuel assembly, installing guidance part of multiple drills on each opening, and installing a side plate on a side opposite to the plate

摘要

The process for discharging a thimble tube of a mixed oxide fuel assembly, comprises installing a plate with openings in the fuel assembly, installing a guidance part having an opening of multiple drills on each opening, installing a side plate of the guidance part on a side opposite to the plate, inserting a restraint part of a cutting element (31) of the drill on the guidance opening, releasing constraint between a sleeve (12) and the thimble tube while turning and advancing the cutting element towards the sleeve, and discharging a part of the thimble tube. The process for discharging a thimble tube of a mixed oxide fuel assembly, comprises installing a plate with openings in the fuel assembly, installing a guidance part having an opening of multiple drills on each opening, installing a side plate of the guidance part on a side opposite to the plate, inserting a restraint part of a cutting element (31) of the drill on the guidance opening, releasing constraint between a sleeve (12) and the thimble tube while turning and advancing the cutting element towards the sleeve, and discharging a part of the thimble tube. Each opening is formed with a site corresponding to each sleeve projected at a face of a lower grid support (11) of the fuel assembly on a side opposite to fuel bars (18). The side plate has a shape and a dimension aligned on the restraint part of the cutting element. The constraint between the sleeve and the thimble tube is obtained by pressing a wall of the sleeve in a concave part. The concave part is formed on an external circumference of a stopper of the lower end of the thimble tube. A strap is located at a level of a base part the lower grid support, and separated during the release of the constraint. Evacuating the turning products mounted on the drill. An evacuation opening is formed in the guidance part during the release of the constraint. The removable stoppers are inserted in the openings of the plate to make a screen with the radiations, and removed before inserting the guidance part in the opening respectively. An independent claim is included for a tool for discharging a thimble tube of a mixed oxide fuel assembly.