RU2260502C1 - Method for fragmentation of radioactive equipment with use of suspended module-units - Google Patents

Abstract

FIELD: nuclear power engineering, dismounting radioactive equipment of nuclear power plants.

SUBSTANCE: method comprises steps of using standard metal cutting tools. In order to enhance safety, there are used: rotary dismounted basic lid of biological protection with slits for moving ropes, suspended unit-modules and cargo-lifting machines with flexible cargo-carrying member in the form of rope to which changeable module-units are joined for cutting body of radioactive equipment by fragments. Module-units are based on inner surface and on edges of said radioactive equipment and they include cutting units with disc milling cutters; feeding units for linear motion of cutting units in guides and assemblies for mounting module-units.

EFFECT: enhanced efficiency and safety of method.

3 dwg

Description

The invention relates to nuclear energy, in particular to the dismantling of hull radioactive equipment of nuclear power plants.

Known methods of dismantling the hull radioactive equipment [Kravchenko PD and others. \ A solution to the problem of dismantling the hull radioactive equipment of nuclear power plants \ // Mechanical Engineering and the 21st Century Technosphere: Proceedings of the VIII International Scientific and Technical Conference in Sevastopol September 10-16, 2001. In 3 volumes - Donetsk: DonSTU, 2001 T .1 - 303 pp.] Involve the use of continuous milling of the body or cutting it into separate blocks using additional non-standard equipment.

The existing scheme for the use of suspended equipment involves the use of several assemblies of cutting, feeding and securing drives in one unit, which complicates the design and reduces its reliability.

In the proposed method, schematically represented by simplified structural schemes in figures 1, 2 and 3, it is assumed that only three individual drives are used: feed, cutting and fixing, which greatly simplifies the scheme.

The method consists in the use of two metal-cutting units suspended on a flexible link (hoisting rope), using, for example, MP as a hoisting machine (reloading machine) or existing hoisting equipment used in the process of installation and operation of hull radioactive equipment.

In the proposed method, to ensure biosecurity, a collapsible cover is used, which is shown in FIG. 1, which, in addition, can serve as a basis for installing additional lifting equipment.

Rope 1 passes through slots 11 in a radially movable removable collapsible cover 2 mounted on a rotating collapsible cover 3. The cover 3 mounted on rolling bearings 6 can rotate by means of a gear 4 with a drive for turning the cover of the control panel 5. To the node 12 of the suspension 8, metal-cutting block modules, designed to fragment the radioactive casing, are connected 7. Biosecurity is provided, in addition to cover 3, by using a radial slotted cover 10 that is movable in the L direction and overlaps the gap 11 for any rope position. The dimensions of the cover 2, its design depends on the radioactivity of the housing 7, its dimensions: the outer diameter ⌀D, the wall thickness t, the gap b between the outer surface of the object and the surface 9 of the protective fence and is determined using known design methods.

The application scheme of the block for cutting fragments is presented in figure 2.

A block module-beam 14, suspended on a rope in the suspension assembly 12, is lowered into the housing 13 with an outer diameter ⌀D _k and a wall thickness t. Block 18 is fixed inside the housing using spacers 15. The cutting of fragments of height h _{f is} done with a circular saw 20 with a diameter ⌀D _p , the drive 19 of which is moved in guides using a screw 17; the feed drive 16 is fixed to the beam 15. The stroke of the circular saw 20 is limited by the clearance b; the stroke size and saw diameter ⌀D _p depend on the width of the cut fragment.

A diagram of the application of the block for cutting an object into vertical petal fragments is presented in FIG. 3.

On the upper edge of the object 31 the housing 22 of the module block is lowered, which is fixed on the object with clamps 23. On the housing 22 of the module in the guides 28, a cutting block consisting of a circular saw 25 with a drive 26 is moved; supply is carried with the screw 27 and the supply unit 29 fixedly mounted on the housing 22. The stroke S is determined cutter height h _f lobe diameter ⌀D _n saws determined by the thickness t of the object wall and the gap b between the outer surface of the object and the surface of the guard 30. The housing 22 blocks are suspended from the rope in the suspension unit K.

Structural and layout calculations are performed using well-known design and engineering methods in mechanical engineering.

The proposed method is simple, which significantly increases the reliability of operation.

Claims (1)

A method of fragmentation of the hull radioactive equipment using a standard metal cutting tool, characterized in that they use a rotating collapsible biosecurity base cover, in the slots of which the rope moves, suspended module blocks and hoisting machines with a flexible load-bearing element in the form of a rope, to which replaceable module blocks are connected for trimming and cutting the hull radioactive equipment into fragments, and the block modules are based on the inner surface and the edges of the specified hull about equipment and consist of cutting units with a disk mill, feed units that provide linear movement of the cutting unit in the guides and fastening units of the unit modules.

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