RU68756U1 - TRANSPORT AND TECHNOLOGY KIT FOR TRANSPORTATION OF NUCLEAR FUEL - Google Patents

Abstract

The invention relates to equipment intended for carrying out at nuclear plants transport and technological operations with nuclear fuel in the form of fuel assemblies of nuclear reactors. The essence of the invention lies in the fact that in the transport and technological kit for transporting nuclear fuel, including a conveyor, a container mounted on it with the possibility of tipping, a container cover and a cover, the container cover is equipped with a clamping device, and is mounted for movement on a carriage, the guides of which are installed on the carrier frame of the conveyor with the possibility of coaxial relative positioning of the cover with the clamping device and the end of the neck of the container body, canting device I made in the form of at least one hydraulic cylinder fixed at one end to the carrier frame of the conveyor, and the other to the bracket on the container body, and the conveyor additionally contains at least two hydraulic jacks mounted on the carrier frame of the conveyor. In this case, the transport - technological kit additionally contains safety outriggers fixed on the supporting frame, the container body is cylindrical and uniformly thick-walled, and a damper made in the form of a hollow cylinder, the wall of which has a regular slot system, is installed and fixed in the upper part of the container. The invention allows to solve the problem of transportation in radiation-safe conditions from one power unit that is decommissioned for afterburning at another power unit, including a power unit of another nuclear power plant, fuel in the form of irradiated fuel assemblies that have not consumed their fuel resource, and ensure the operability and suitability of transported irradiated fuel assemblies for use as fuel at another power unit on the territory of the nuclear power plant and beyond. 1 n and 4 z.p. f, 3 FIG.

Description

The invention relates to equipment designed for carrying out at nuclear plants (AS) transport and technological operations with nuclear fuel in the form of fuel assemblies (FAs) of nuclear reactors.

Famous "Transport packaging for transportation and storage of nuclear fuel", patent RU 2241268, G 21 F 5/008, publ. 2004.11.27. The transport packaging set contains a housing formed by pipes with flanges and support legs with attached upper supports with clamps, lower supports with holes for placement of clamps and cargo eyes. In addition, it contains covers with fasteners that are mounted on pipe flanges, canisters and wooden inserts that are installed inside the pipes and form working cells for placing TVS. On the pipe flanges, dampers are supported that rest on the covers and have recesses or holes for accommodating the cover fasteners . To the lower supports are attached, with the help of shock absorbers, support sheets with holes for accommodating the clamps. Wooden inserts are provided with recesses in which along the length of the active zone of the fuel assemblies are absorbing neutron flux, steel plates adjacent to the canisters.

The well-known "Transport and packaging set for transportation and storage of spent nuclear fuel", patent RU 2127919, G 21 F 5/008, publ. 1999.03.20, Transport and packaging set contains a cover, a housing with a cavity, a cover, fixing elements. On the cover, made with a removable cover, a protective shell is installed, included in the bore on the inner surface of the housing. The protective shell has a diameter larger than the diameter of the cover. At the same time, additional keys are installed on the body boring.

A known container for a long radioactive product patent RU 1597000, G 21 F 5/00, publ. 1995.12.20. The container contains a housing mounted vertically and made of radiation-protective material, with a cavity open at the bottom and designed to accommodate the product with a gripping head and a pendant in the form of a glass, a winch, a cable, a grip fixed to the end of the cable and having a cylindrical-shaped body 9 with bottom end and stop, and a centering device that includes a ring mounted on a stop with the possibility of vertical movement along the gripper body, levers (at least three) having two straight sections with bom and fixed end of the first rectilinear

plot with the possibility of rotation relative to the ring in a plane passing through the axis of the gripping body, stops located on the ring with the possibility of interaction with the first rectilinear sections of the levers and wheels mounted on the end of the second rectilinear section of each lever with the possibility of rotation.

Known technical solutions are intended for transporting fuel in the form of spent fuel assemblies to be removed from the reactor for one reason or another: defects or damage, the need for replacement due to complete burn-out, etc., for subsequent disposal or disposal. At the stages of loading into a transport container and transportation of spent fuel assemblies, there is no requirement to maintain their integrity in order to ensure the suitability of fuel assemblies for their further use as fuel.

Closest to the technical nature of the claimed invention is a transport and technological kit for transporting TK-8 (Shvedov V.P. et al., Nuclear Technology, M .: Atomizdat, 1979, p. 157 and 158), intended for transportation by rail of spent fuel assemblies of a nuclear reactor of the type of high-power channel reactor (RBMK). A well-known transport and technological kit includes a conveyor in the form of a special freight car, a container and a container tilting device installed on the conveyor, a container lid and a case for spent fuel assemblies located in the container. A container and a special freight wagon comprise one structure: a wagon is a container unit. The wagon structurally consists of a railway conveyor with a body and a protective container installed in it, three container supports and a container turning drive. In the transport position, the container is located horizontally along the axis of the car and is fixed at the ends on two supports. In the middle part of the container there are trunnions, the axis of which is the axis of rotation of the container in a vertical position. The container is rotated to a vertical position when loading fuel assemblies into the speakers and removing them at the regeneration plant. The container is turned with the help of an electric drive and a cable system connecting the drive drum and two pulleys on the container. Spent fuel assemblies are loaded into a wagon container in a multi-seat transport case. Loading (unloading) of the cover is carried out with the vertical position of the container through its neck.

The container, which is a thick-walled steel pipe at the bottom and a thin-walled pipe at the top with a bottom, trunnions and a cap in the form of a gripping plug, is a container for a cover and biological protection. The implementation of the upper part of the container thin-walled in order to reduce the intensity does not provide

reliable biological protection of staff during loading (unloading) of fuel assemblies.

When carrying out transport and technological operations of irradiated fuel of RBMK-type nuclear reactors at a nuclear power plant, fuel assemblies of the entire spectrum of burnups from the minimum to the maximum burnout are in the core. Most of the assemblies in a stopped reactor of one NPP unit have significant value, because burnup of fuel in them is much less than design. Such irradiated assemblies can be reloaded into the active zone of a working reactor of another AS unit and burned in it. This will reduce both the number of fresh fuel assemblies required for the operation of a reactor of another power unit and the total mass of spent nuclear fuel to be stored at the station.

Taking into account Russian and international safety standards when carrying out transport and technological operations for transporting irradiated fuel from one reactor for afterburning in another, it is necessary, both during normal operation and in case of accidents, to eliminate mechanical damage to overloaded irradiated fuel assemblies, to prevent criticality; provide reliable radiation protection; prevent unacceptable release of radioactivity; ensure fire safety and physical safety.

The task of the claimed invention is to transport in radiation-safe conditions from one power unit that is decommissioned for afterburning at another power unit, including a power unit of another AS, fuel in the form of irradiated fuel assemblies that have not consumed their fuel resource.

The technical result from the use of the invention is to maintain operability and ensure the suitability of the transported irradiated fuel assemblies for use as fuel at another power unit on the territory of the nuclear power plant and beyond.

The specified technical result is achieved by the fact that in the transport and technological kit for transporting the fuel of the reactor of the nuclear power plant, including a conveyor, a container mounted on it with the possibility of tipping, a container cover and a cover, the container cover is equipped with a clamping device and mounted on the carriage with the possibility of movement which are mounted on the carrier frame of the conveyor with the possibility of coaxial mutual arrangement of the cover with the clamping device and the end of the neck of the container body Era, the tilting device is made in the form of at least one hydraulic cylinder, fixed at one end to the conveyor carrier frame, and the other to

the bracket on the container body, and the conveyor further comprises at least two hydraulic jacks mounted on the carrier frame of the conveyor. At the same time, the transport and technological kit additionally contains safety outriggers fixed on the supporting frame, the container body is cylindrical and uniformly thick-walled, and a damper made in the form of a hollow cylinder, the wall of which has a regular slot system, is installed and fixed in the upper part of the container.

The invention is illustrated by drawings. The figure 1 presents a schematic representation of a transport and technological kit for transporting nuclear fuel of a nuclear power plant, in figure 2 - type A of a transport and technological kit, in figure 3 - an external element B - a container cover with a clamping device.

The transport and technological kit includes (Fig. 1) a railway conveyor 1 mounted on it with the possibility of tipping the container 2 with a cover 3 located inside.

The conveyor 1 additionally contains at least two hydraulic jacks 4 mounted on the carrier frame of the conveyor 1, providing the possibility of hanging with a given accuracy of the carrier frame of the conveyor in the transport corridors of the AC units. Hanging is necessary to ensure seismic protection of irradiated fuel assemblies during fuel loading operations (installation of a cover 3 with irradiated fuel assemblies in container 2 and removal from container 2). This ensures a direct kinematic connection of the supporting frame with the floor of the transport corridor, bypassing the spring sets of serial running trucks of the railway conveyor, which do not provide the necessary category of earthquake resistance provided for by federal norms and rules. In addition, the hydraulic jacks 4 perceive shock loads on the conveyor 1 in case of emergency: falling cover in the container.

The container 2 is designed to accommodate a cover 3 with irradiated fuel assemblies, a damper 5, protection against ionizing radiation and the retention of radionuclides from leaving the enclosure. The container 2 with the cover 3 is installed and fixed on the carrier frame of the conveyor 1 using trunnion supports. The container body 2 is a cylindrical thick-walled vessel.

The canting device of the container 2 is made in the form of at least two hydraulic cylinders 6, fixed at one end on the carrier frame of the conveyor 1, and

others - to the bracket on the container body 2, and ensures that the container 2 is tilted to a vertical position.

When this transport - technological kit additionally contains (figure 2) at least two safety outriggers 7, fixed on the supporting frame.

The cover with the clamping device 8 (Fig. 3) is designed to close and seal the neck of the container body 2, which is in a horizontal position on the conveyor 1. The cover with the clamping device 8 is mounted on the carriage 9, which, moving along the guides, position the cover with the clamping device 8 relative to the end of the neck of the container 2. The carriage 9 and the guides are designed for longitudinal movement of the lid with the clamping device 8 relative to the end of the neck of the container 2. The guide carriage 9 is mounted on the carrier frame of the conveyor 1 and ensure the relative position of the cover with the clamping device 9 and the end of the neck of the container 2 for docking. The cover with the clamping device 8 is quick-detachable.

In the upper part of the container 2, a damper 5 is installed and fixed, which serves as a support for the cover during normal operation, and also reduces the dynamic loads that occur when the cover with irradiated fuel assemblies falls into the container body 2 during loading or unloading. It is a hollow cylinder that is inserted into the container body 2 of the upper part. The cylinder along the entire length (height) has a regular system of equal slots arranged in a checkerboard pattern. In each section perpendicular to the axis of the cylinder and having slots, the number of slots is six. The slots of one row are separated from each other by equal widths with bridges of solid metal. Two adjacent rows of slots are separated from each other by a solid metal forming a continuous girdle. The location of the slots in two adjacent rows is such that the jumpers of one row are located above the midpoints of the slots of the adjacent row, etc.

Case 3 is designed to accommodate spent fuel assemblies in it and is installed in the container body 2 in compliance with nuclear safety requirements.

Transportation of nuclear fuel in the form of irradiated fuel assemblies with a transport and technological kit for can be carried out as follows:

The conveyor 1 with the container 2 is fed to the tipping point. Using hydraulic jacks 4, the carrier frame of the conveyor 1 with the container 2 is hung out. After that, the safety outriggers are pushed out and fixed 7. Then the lid with the clamping device 8 is depressurized and the lid with the clamping device 8 is removed from the neck of the container 2. Using the hydraulic cylinder 6,

tilting container 2 to a vertical position. After canting, the container 2 is fixed with an upright support and the cover 3 is removed for subsequent sequential loading of the irradiated fuel assemblies.

After filling all the nests of the cover 3, the latter is placed in the container 2, which is turned over from the vertical to the horizontal position using the hydraulic cylinder 6 mounted on the conveyor 1. After that, the conveyor is transferred to the transport position and transported to another power unit for afterburning.

The invention allows in conditions of nuclear safety, to transport irradiated fuel assemblies with fuel burnup less than design, while maintaining their operability and suitability for afterburning at another power unit on the territory of the nuclear power plant and beyond. Moreover, the invention allows to provide reliable radiation protection for the NPP personnel when loading a case with irradiated fuel assemblies into a container, transporting and unloading, to exclude the release of radionuclides into the environment, and to ensure the dissipation of residual heat emission from irradiated fuel assemblies.

Claims (5)

1. A transport and technological kit for transporting nuclear fuel, including a conveyor, a container mounted on it with the possibility of tipping, a container cover and a cover placed in the container, characterized in that the container cover is equipped with a clamping device and mounted on the carriage with the possibility of movement which are mounted on the carrier frame of the conveyor with the possibility of coaxial mutual arrangement of the cover with the clamping device and the end of the neck of the container body, the device The structure is made in the form of at least one hydraulic cylinder fixed at one end to the carrier frame of the conveyor, and the other to the bracket on the container body, and the conveyor additionally contains at least two hydraulic jacks fixed on the carrier frame of the conveyor. 2. The transport and technological kit according to claim 1, characterized in that it further comprises safety outriggers fixed on a supporting frame. 3. The transport and technological kit according to claim 1, characterized in that the container body is cylindrical and uniformly thick-walled. 4. The transport and technological kit according to claim 1, characterized in that a damper is installed and fixed in the upper part of the container. 5. The transport and technological kit according to claim 4, characterized in that the damper is made in the form of a hollow cylinder, the wall of which has a regular system of slots.