Container for transportation and long term storage of spent fuel assemblies of nuclear power plants

 

(57) Abstract:

The essence of the invention: container for transportation and long term storage of spent fuel assemblies (SFA) includes an outer housing with cover, shock absorbers and the inner case with lid. The inner case is based on the shock absorbers, fixed on the bottom of the horizontal outer casing. In the inner casing installed pouches with slots for SFA. Cover the outer casing is in its end, and its inner surface is provided with a rigidly attached and evenly spaced absorbers. At the bottom of the outer casing shock absorbers also are evenly spaced, and each absorber recruited from glasses made in the form of hollow metal cylinders of different diameter, installed in each other with clearances in the direction of load application and rigidly interconnected in place mate. The technical result consists in increasing the reliability of the protection of environmentally hazardous cargo from impact shock loads during transportation, long term storage, in emergency situations, when injected into the fire, as well as to simplify manufacturing and Assembly. 3 Il.

Sobroso storage of spent fuel assemblies of nuclear power plants.

Known container for transportation and storage of spent nuclear fuel that contains vertically mounted metal case having a cylindrical shape attached to the housing of the damping ribs having the form of a flat horizontal rings with tabs, radiation protection, consisting of a hollow cylinder and containing neutrality material, hollow cylinders of radiation protection is made of metal with a coefficient of thermal expansion greater than the coefficient of thermal expansion of the housing material (RF patent N 1630558, G 21 F 5/00, publ. 20.03.89).

In this container, the damping ribs create a sufficiently high resistance in emergency situations, but in the transport position, the container is vertical, so this design is designed for a small length of spent fuel assemblies (SFA), which limits the scope and penetration of the container in the fire due to the high temperature (800oC) possible destruction neutronstar material, resulting in increased radiation hazard to personnel and protection of environment.

Known container for transportation and storage is to place a damping casing of the detachable elements, made in the form of a drum with end walls and sides, including Central and terminations. The end walls of the casing are installed radially spaced tubular members fastened respectively with integral elements of the shell and to each other. The generatrix of each end element of shells have other tubular members fastened respectively with an end element of the shell and to each other (patent RF N 2105364, G 21 F 5/008, publ. 20.02.98).

The container closest to the proposed and selected as a prototype. The disadvantage of container is that each container of the set of elements providing damping of shock, working in a relatively narrow range of loads - from the load, which causes the beginning of the elastic deformation of the elements, to load with the increase of which elements collapse and stop damping. Therefore, for reliable protection of spent fuel assemblies (SFAS) NPP must accurately match the damping properties of the elements with the expected loads. Since it is not always possible, the damping of the container is not reliable enough.

Thus, the objective of this cargo from impact shock loads during transportation, long-term storage, in emergency situations, when injected into the fire, simplification of manufacturing and Assembly.

Technical result achieved when using the claimed invention, is that the totality of its symptoms, providing damping, has a stepwise increase impact resistance by switching alternately glasses shock absorber from the least stringent external to more internal hard.

To achieve this technical result container for transportation and long term storage of spent fuel assemblies (SFAS) NPP containing the outer body with lid, bumpers, inner case with lid and with means for attaching the outer casing resting on the bumpers, fixed on the two horizontal outer casing, provided with a cover with the slots for SFA mounted in the inner casing, the cover of the outer casing is in its end, and its inner surface is provided with a rigidly attached and evenly spaced absorbers, and the bottom of the outer casing shock absorbers are evenly spaced, and each shock absorber the nagg with clearances in the direction of load application and rigidly interconnected in place mate.

The features that distinguish the proposed container for transportation and long term storage of spent fuel assemblies of nuclear power plants from the closest known RF patent N 2105364 with case with slots for SFA mounted in the inner housing, which contributes to long-term storage, cover the outer casing is in its end, and its inner surface is provided with a rigidly attached and evenly spaced absorbers, and the bottom of the outer casing shock absorbers are evenly spaced, and each absorber recruited from glasses made in the form of hollow metal cylinders of different diameters, installed in each other with clearances in the direction of load application and rigidly connected in place of a pair that contributes due to selection of the number and severity reliable protection of SFAS in a wide range of loads from minimum, which can damage the SFA, to the reasonably expected maximum. Moreover, the elements of the shock absorbers have a fairly simple form and making them straightforward.

The proposed container for transportation and long term storage of spent fuel assemblies of nuclear power plants illustrated and long-term storage of spent fuel assemblies of nuclear power plants;

in Fig. 2 - section a-a, the location of the absorbers inside the container;

in Fig. 3 damper in cross-section B-B.

Container for transportation and long term storage of spent fuel assemblies of nuclear power plants (Fig. 1) includes an outer housing 1 with a cover 2, cover 3 with the slots for SFAS 4, the damper 5. The container has an internal housing 6 with the cover 7 covering the case with 3 slots SFAS 4, containing the means 8 for attaching the outer housing 1 and supported on the shock absorbers 5, evenly placed and fixed on the bottom horizontally installed the outer casing 1 and the inner surface of the cover 2 of the outer casing 1.

The number of absorbers 5 (Fig. 2) is determined by the number and weight of SFAS 4: the greater the number of SFAS 4 (in this container 17 SFA 4), the greater the load on the absorber 5, the greater the number of absorbers 5.

Each shock absorber 5 (Fig. 3) can be dialed from 1 or more cups 9 and 10, is made in the form of hollow metal cylinders of different diameter, installed in each other with clearances in the direction of load application.

The dimensions "E", "d", and the angle (Fig. 2) selected constructively depending on the number and the Mac is istii external loads on the damper 5 is a deformation of the latter, which leads to the increase of size d, then by dimension "D" will not be lining and friction between the absorber 5 and the outer housing 1.

Gaps1and2selected constructively on the basis of conditions: as a result of external impact due to the gradual damping of the energy initially by clearance 1, further due to clearance2and due to the inner Cup 10 - full damping of the energy that protects environmentally hazardous cargo from impact shock loads during transportation and in emergency situations.

The metal strip 11 (Fig. 1) with graphite filler, made by OST 26.260.454-93, withstands temperatures up to 800 degrees C for 30 min in the hearth flame of fire.

Container loading is as follows.

The tilter seize the container and set in a vertical position on the Assembly platform (not shown). Otstegivayut the cover 2 of the outer casing 1, gear valve inner housing 6 and is transferred to the ground for loading case 3 with SFAS 4 (not shown). Otstegivayut the cover 7 of the inner case 6 load case 3 with SFAS 4 and produce drying with hot air SFAS 4. This is necessary tinkertim gas inner housing 6 through the valve, not shown in the drawing. Return the internal casing 6 into the container, sealed outer housing 1 with a lid 2 and is installed in a horizontal position.

In this position the container with hazardous cargo prepared for transportation in the railway carriage.

Consider emergency stop during transportation of the container with the SFA.

During the movement of the container rigidly mounted on the platform cover in the direction of travel, when braking the outer housing 1 with a cover 2 remains in place, and the inner housing 6 with the cover 7 by inertia continue to clash with shock absorbers 5, arranged on the inner end surface of the cover 2. Efforts squeezing first perceived outer cups absorbers 5, then through the gaps between the cups 9 and 10 is the gradual extinguishing of energy, resulting in the inner housing 6 with the cover 7 stop moving. Thus protected from destruction inner housing 6 with the cover 7 and is not disturbed by their tightness. This allows the further transportation of the container without removing to the destination. In case of sudden braking when the location of the container bottom is different at the bottom of the outer casing 1, while the shock absorbers 5 perceived effort of squeezing in the above sequence. The dampers 5 are made of simple parts, easy to manufacture and assemble.

Designed container for transportation and long term storage of long (up to 14 m) of the SFA provides protection of environmentally hazardous cargo from impact shock loads during transportation, long-term storage (up to 50 years), in emergency situations, when injected into the fire.

Container for transportation and long term storage of spent fuel assemblies (SFAS) NPP containing the outer body with lid, bumpers, inner case with lid and with means for attaching the outer casing resting on the bumpers, fixed on the bottom of the horizontal outer casing, characterized in that it has a case with slots for spent fuel assemblies mounted in the inner casing, the cover of the outer casing is in its end, and its inner surface is provided with a rigidly attached and evenly spaced absorbers, and the bottom of the outer casing shock absorbers are evenly spaced, and it is set out in each other with clearances in the direction of load application and rigidly interconnected in place mate.

 

Same patents:
The invention relates to the field of management of radioactive materials and can be used for transportation, storage and disposal of solid high-level radioactive waste

The invention relates to a mobile protective containers for safe transportation of spent nuclear fuel from storage after exposure to the plants regenerate under conditions that exclude the possibility of inadvertent nuclear chain reaction

The invention relates to nuclear power could be applied in other industries, for example, in the chemical, for output from the biosphere dangerous toxins

The invention relates to the field of nuclear technology and can be used for transportation and storage of spent nuclear fuel

The invention relates to the field of nuclear energy

The invention relates to nuclear technology, and can be used for packaging of spent nuclear fuel (SNF) during transportation and/or long-term storage

The invention relates to nuclear technology and can be used for packaging of spent nuclear fuel for its transportation and/or long-term storage

FIELD: safety facilities for handling radioactive materials.

SUBSTANCE: proposed internal container designed for long-time storage and transport of high-radioactivity materials such as plutonium dioxide has container body closed with sealed cover and specified-volume charging box placed in this body and provided with its respective cover. Container body has cylindrical passage for charging box that mounts additional internal cover provided with gas filtering device and hermetically installed relative to its surface for axial displacement. External cover of container body is provided with shut-off valve accommodating gas filtering device installed therein between inner space of container and valve seat. Such mechanical design of container enables reducing irreparable loss of plutonium during its long-time storage and transport.

EFFECT: enhanced safety and reliability , enlarged functional capabilities of container.

7 cl, 2 dwg

FIELD: handling radioactive wastes.

SUBSTANCE: proposed method for nuclear fuel storage in container includes introduction of nuclear fuel in fuel collector, as well as preparation of formwork to receive concrete body and installation of fuel collector into formwork. Formwork is immersed in tank and concrete is placed in immersed formwork to form concrete housing. Formwork with concrete housing formed therein is extracted from tank. System for manufacturing nuclear fuel storage container and for holding fuel in fuel collector installed in concrete housing that forms part of storage container has water tank. In addition it has tools for assembling formwork for storage container concrete housing and facilities for conveying formwork and fuel collector to water tank. It also has facilities for introducing nuclear fuel in fuel collector, facilities for concrete placement in formwork, and those for removing formwork from water tank. Nuclear fuel storage method includes piling of containers so that their central channels are aligned and held open for intercommunication. Fluid cooling agent is supplied to bottom end of central channel in lowermost storage container and discharged from top end of central channel in uppermost storage container.

EFFECT: enhanced reliability of radioactive waste isolation.

25 cl, 7 dwg

FIELD: storage of hazardous materials.

SUBSTANCE: proposed device for keeping in storage hazardous materials such as spent radioactive nuclear fuel has cylindrical concrete housing accommodating three-dimensional pre-stressed hardware and axially elongated hazardous-material storage area. Pre-stressed hardware includes hardware fittings spirally passed about storage area and disposed in concrete housing close to outer surface.

EFFECT: enhanced reliability of hazardous material storage.

7 cl, 8 dwg

FIELD: shipment and storage of highly active wastes.

SUBSTANCE: proposed container for transport and dry storage of spent nuclear fuel has hermetically sealed storage tank and can holding spent nuclear fuel. In addition, it has external steel-reinforced concrete casing with outer and inner metal shells and bottom, cooling ducts, and fixing dampers. Hermetically sealed tank is provided with transport ring that holds shell in position relative to longitudinal axis of casing and with three detachable lids. It is also provided with dampers disposed over entire perimeter of inner cylindrical shell that function to lock cylindrical shell on lid and outer steel-reinforced concrete casing and to transfer heat therefrom. Cooling system is designed so that cooling air flows through cylindrical gap between outer surface of tank and inner surface of external steel-reinforced concrete casing over cooling ducts.

EFFECT: enhanced operating reliability of container.

5 cl, 4 dwg

FIELD: handling spent nuclear fuel.

SUBSTANCE: proposed module designed for storage of spent nuclear fuel has tight case with inner space to receive spent nuclear fuel. Module is provided with ring made of solid ferromagnetic material possessing magnetocaloric properties. Ring is provided with drive and is free to rotate about its axis. It is disposed so that part of this ring is inside module in immediate proximity of tight tank holding spent nuclear fuel. Other part of ring is placed in constant magnetic field outside of module and can be cooled.

EFFECT: enhanced safety of spent nuclear fuel dry storage.

1 cl, 2 dwg

FIELD: nuclear engineering.

SUBSTANCE: proposed device for storage and/or transport of spent nuclear fuel has housing and cover forming inner space for holding spent nuclear fuel. Inner space is divided by means of partitions into compartments, each compartment being meant to receive spent fuel assembly. Each compartment accommodates two tanks holding metal hydride or intermetallic compound. These tanks are provided with channels pressurized with respect to inner space of device which are used to discharge hydrogen produced due to heat released by fuel assembly. Hydrogen outlet channels are designed for charging metal hydride through them and are provided with closing valves.

EFFECT: enhanced reliability of spent nuclear fuel storage and its safety in transit.

1 cl, 3 dwg

FIELD: transport and storage of spent nuclear fuel.

SUBSTANCE: proposed method includes placement of fuel assemblies in transport package incorporating container and split damping casing designed so as to minimize lift of container when inserting it in split damping casing. Transport package is conveyed to storage place where container is freed of casing, whereupon spent fuel assemblies are kept in storage place. In the process spent fuel assemblies are first placed in container and then the latter is inserted in vertical position into split damping casing made in the form of removable drum with butt-end covering and base that functions as end lid of this drum. Charged container is installed on base, covered on top with removable drum, and the latter is fastened to base. Then split damping casing is secured to container, whereupon transport package is conveyed in transport position to storage place.

EFFECT: enhanced reliability of storage and transportation.

6 cl, 5 dwg

FIELD: nuclear engineering.

SUBSTANCE: proposed method includes loading spent fuel assemblies in metal-concrete container, conveying the latter to intermediate storage site, and holding it on storage sire. Shipping unit for conveying spent fuel assemblies to intermediate storage site has flat-car for carrying vertically mounted container holding spent fuel assemblies. Container is provided with external removable circular supporting member engageable with mating supporting surface of flat-car frame and means for locking container relative to mentioned frame. Shipping unit is provided with jacks for lifting the frame to load spent fuel assemblies in container. Side surface of container body has rigging members in the form of seats on its top and bottom ends. Bottom end of container is installed inside mentioned circular supporting member. Container locking means include radially disposed submersible adjustable stops.

EFFECT: enhanced reliability and safety of proposed method and device.

4 cl, 8 dwg

FIELD: storage and transportation of used nuclear fuel.

SUBSTANCE: metal-concrete container for transportation and/or storage of used assemblies of fuel elements of nuclear reactors has case with bottom, internal protection air-tight cap, edge damping members. Casing with central cell is inserted inside cavity of case. Peripheral cells are disposed around central cell for mounting housings with used assemblies of fuel elements. Peripheral cells are made in form of tubular members that are mounted to have spaces in relation to internal protection air-tight case and bottom of case. Casing has longitudinal rod members disposed around circle in relation to central cell of casing. Container has first and second sheet members which are mounted along height of case and are connected for disconnection by means of longitudinal rods. Edge damping members are made in form spring-shaped members and they are mounted onto internal protection air-tight cap each in opposite to corresponding cell of casing for interaction with housing under normal conditions of exploitation of metal-concrete container.

EFFECT: higher safety of handling of loaded container.

6 cl, 7 dwg

FIELD: storage and transportation of spent nuclear fuel.

SUBSTANCE: proposed metal-concrete container for transportation and/or storage of nuclear-reactor spent fuel assemblies has housing with bottom, internal pressurizing safety cover, hood inserted into housing and provided with cells to receive boxes with spent fuel assemblies. Container also has damping members engageable with cover on inner surface end, with housing bottom, and with housing internal wall. Hood is installed within housing in a space relation to housing internal wall. Side damping members are installed between the latter and hood. Each damping member is made in the form of longitudinal rod passed through holes in respective first and second sheet members installed throughout container height on internal wall of housing and on hood and disposed in parallel with housing bottom.

EFFECT: enhanced reliability of spent nuclear fuel storage.

6 cl, 5 dwg

Up!