The method of connection of the cover fuel assemblies with end pieces

 

(57) Abstract:

Use: in the manufacture and operation of the fuel assemblies of nuclear reactors. The inventive method includes a beam Assembly, installation on its bearing bars of the shank, the manufacture of the cover, connecting it with the cylinder, the installation of the beam Assembly with the shank in the case and run them together, in which to provide Assembly and disassembly of FAS on the seats of the case do flanging with holes, and the shank is cylindrical protrusions that are installed in the above-mentioned hole of the cover; edges of cover slots parallel to its longitudinal axis, the resulting side faces of the plastic throw away from the longitudinal axis of the cover, not beyond the elastic deformation, thus, to display the contour of the flanging abroad contour of the inner bore of the case, or pre-formed to the desired angle, after which in the case set the beam, a portion of the face between the slits is pressed to the landing places of the shank, putting holes of the cover on the respective cylindrical projections of the shank, and then fix them with screws flat head. 1 C.p. f-crystals. 1 Il.

The invention of Attali fuel assemblies (FA) nuclear power reactors.

There is a method of connection of the cover fuel assemblies with end pieces, including the Assembly of a bundle of fuel rods in the frame of the spacer and carrier gratings, accession through the carrier bars of the shank, the manufacture of the cover sheet billet of zirconium alloy, connecting it with the cylinder, install assembled with the shank of the beam in the case assembled with the cylinder and the connection of the cover with the shank [1], and the connection of the cover with integral parts produced according to the method described in [2].

A common shortcoming of these methods assemblies fuel Assembly and connection of the cover with integral parts is that you cannot work wrong for ensuring the subsequent Assembly disassembled subassemblies. Meanwhile, work experience at nuclear power plants shows the increasing need for such operations with partially spent fuel assemblies in the reactor for carrying out regulatory inspections of their condition, and for replacement of defective fuel rods with subsequent return again collected fuel assemblies in the core, which is quite reasonable from an economic point of view.

The closest in technical essence and taken as the prototype of the method of connection of the cover fuel assemblies with integral parts is PCOS case perform a threaded hole with a landing place for countersunk head screws in the appropriate places of the case do screw holes, then put the cover on the end piece, forming a seat under the screw head in the case, using as a matrix a seat under the screw head in the end parts, then install the retaining screw) and its welding to the body end of the part. The disadvantage of this method is that when the dismantling of such connection bulge inward seats under countersunk head screws in the cover is a hindrance to the passage of a bundle of fuel rods when removing it from the case, and reverse Assembly - an obstacle for the passage of a bundle of fuel rods inside the case, and to set the limit of items in the case.

The technical result of the present invention is to provide a method of assembling fuel Assembly and connection of the cover fuel assemblies with integral parts, which would disassemble functional FA to extract from it a bundle of fuel rods and after the required manipulations to gather again for subsequent installation in an active zone, and the number of shootouts should not be limited to one.

This technical result is achieved in that the lateral cylindrical surface of the flat cover on the faces perform the hole flanging, and on the edges of the grooves, the length of which allows putting the cover on the beam and assembled with the shank him by divorce limited slots parts of faces in the side of the longitudinal axis of the fuel Assembly, without cover material beyond the elastic deformations in the area of the seat under the cover of the shank and head perform the cylindrical protrusions around them - circular grooves in the lugs - threaded holes, and the ends of the projections performed by one notch to ensure the securing screws after installation of the beam Assembly with the shank and head in the case, limited slots of the side faces of the cover to press seats shank, putting holes of the cover on the respective cylindrical projections of the shank, at the same time placing the flange in the groove, and then fix the flange with screws mounted in said threaded holes made in the cylindrical protrusions, and screws) to prevent them from coming loose, deforming each of the "skirt" their heads in the above-mentioned groove on the end face of the cylindrical protrusion.

The above steps are performed in the case, if the divorce is limited by the slots of the parts of faces in the side of the longitudinal axis FA of Macy material of the cover. However, in some cases it is more convenient to pre-bend them to the desired angle and leave in this position, deformirovaly case accordingly. This solution is achieved by the fact that divorce is limited by the slots of the parts of faces in the side of the longitudinal axis of the fuel Assembly is performed by plastic deformation, locking them in position, when the contours of the flanging not included within the contour of the bore of the inner surface of the cover.

An example implementation of the method shown in the drawing, which shows the position of the dissolved limited slots parts of faces in the side of the longitudinal axis of the fuel Assembly during installation in case of beam FA and assembled with the shank him.

Sources of information:

1. B. A. Dementyev. Nuclear power reactors. - M.: Atomenergomash, 1990., S. 42-44.

2. RF patent 1789326, G 21 C.

3. RF patent 2019379, G 21 C.

1. The method of connection of the cover fuel assemblies with end pieces, including the manufacture of the cover, the manufacturing of screws, to produce end parts of the head and shank, the Assembly of a bundle of fuel rods, fastening collected in a bundle of fuel rods in the carrier bars, installing it through the carrier bars on the shank, the installation of the beam Assembly with the shank in the case, austrianism last, characterized in that the lateral cylindrical surface of the flat heads of the screws perform step with the formation of the "skirt" area seats under the end parts in the pouch on his edges perform the hole flanging, and on the edges of the grooves, the length of which allows putting the cover on the beam and assembled with the shank him by divorce limited slots parts of faces in the side of the longitudinal axis of the fuel Assembly, without cover material beyond the elastic deformations in the area of the seat under the cover of the shank and head perform the cylindrical protrusions around them - ring grooves, in the tabs - threaded holes, and the ends of the projections performed by one notch to ensure the securing screws after installation of the beam Assembly with the shank and head in case limited by the grooves of the side faces of the cover to press seats shank, putting holes of the cover on the respective cylindrical projections of the shank, at the same time placing the flange in the groove, and then fix the flange with screws mounted in said threaded holes made in the cylindrical protrusions, and screws) from the spontaneous torchiani is in p. 1, characterized in that the divorce limited slots parts of faces in the side of the longitudinal axis of the fuel Assembly is performed by plastic deformation, locking them in position, when the contours of the flanging not included within the contour of the bore of the inner surface of the cover.

 

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Catching device // 2245585

FIELD: nuclear engineering.

SUBSTANCE: proposed catching device designed for handling components of processing zone delivered thereto from control zone separated from the latter by partition has hollow shaft passed through partition. Hollow shaft extension in processing zone carries traction-member adjusted catcher. Traction member is passed through hollow shaft and joined to control element by shaft extension in control zone.

EFFECT: enhanced reliability and safety.

8 cl, 6 dwg

FIELD: physics; nuclear reactors.

SUBSTANCE: invention covers abnormal storage irradiated graphite sticks, removed from processing mines of nuclear power plants with graphite-uranium reactors, conveyed within reactor hall and sawed. Module contains box-like vessel with in-built guide-supported wheeled cart. Latter includes guide-supported wheeled carriage with handling loops and semiautomatic lock-on, as well as a line of paired bearing rollers with first being power-driven. The vessel is mounted in receptacle of support-and-shield plate above the stick removed from the processing mine and conveyed to sawing device. The module is provided with vessel tipping and locating stock, environmental enclosure with sawing chamber supplied with power-driven stick feed roller and sawing device, e.g. reciprocating saw that sawing sticks delivered through the loading hopper to shielding container.

EFFECT: ensured radiation safety level required for abnormal storage irradiated graphite sticks, removed from processing mines, conveyed and sawed.

9 dwg

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