Metal-concrete container for transportation and/or storage of nuclear-reactor spent fuel assemblies

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

 

The invention relates to containers for storage and transportation of spent nuclear fuel (SNF).

Known containers for transportation and/or storage of SNF. In accordance with the radiation safety standards and IAEA recommendations such containers must provide a high radiation-protective and mechanical properties, including during emergency situations encountered in the course of transportation and storage of SNF.

Known storage container for canisters and fuel cartridges covered by the patent DD No. 224144 A1, G 21 19/06, 1985, Design is known container allows you to set the canisters and fuel cartridges of various sizes. In the upper part of the container is provided by the ring and the bottom ring bottom sheet. Both rings are held and rigidly connected by rods located around the rings along the longitudinal axis of the container. Inside the container in its upper part there is a double intermediate plate, and the lower part is installed one or more of the ordinary intermediate bottoms, removable-United with rods. The intermediate bottom (diaphragm) have holes-cell for installation of the canisters. In the center of the container is provided by a vertical pipe, rigidly connected with the bottom sheet of the lower ring and Rethimno connected with the intermediate bottoms. Central the pipe in the upper part has a nozzle in the form of clutch cargo capture.

However, in the known container is not provided with means ensuring protection of the structure from damage during potential emergency situations. In addition, the container has limited use.

Known container type TC-6, designed for the transportation of spent fuel assemblies fuel rod (see technical report IAEA: IAEA-TECDOC-1081. April 1999, p.58, 59). Known container has a metal shell closed at the top of the metal sealing cap and inserted into the body cavity of the removable part (case), through the holes in the diaphragms of which are spent assembling the fuel element.

A disadvantage of the known container is the high complexity of manufacturing the metal housing and hence the high cost. In addition, in the known container is not provided with means for cushioning removable parts (cover) with SNF in possible emergencies.

Known container for transportation of spent fuel assemblies of nuclear reactors patent RU No. 2120675, G 21 F 5/008, 1998 Known container has a metal shell closed at the top of the metal sealing cap, and inserted into the body cavity of the removable part (case), in the holes of the diaphragm which is placed pouches (canisters) spent fuel assemblies (FROM THE S). Covers of various sizes or set their bottom ends to the bottom of the container, or suspended on the supporting shoulders in the openings of the removable parts for the upper shoulders of the covers with the SFA. In an embodiment on the upper ends of the pouches with SFAS until it stops at the ends of the worn upside down with the required thickness of the bottom of the removable hollow cylindrical buffer having at the bottom of the cavities ethylene-propylene rubber gaskets. Thus, the attenuation of covers given the emphasis in the bottom of the cover. To ensure the depreciation of the cover accidental falling of the container to cover the bottom of the covers are secured ethylene-propylene rubber gasket.

Also known container for transportation and long term storage of spent fuel assemblies of nuclear power plants by patent RU No. 2148864, G 21 F 5/008, 2000, Known container has an outer housing with cover, shock absorbers (end of the damping device 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 internal housing is the case with the slots (cells) 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 the location is s evenly. Each shock absorber is dialed 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. Container loading is carried out in a vertical position, after which the container by tilting unit is installed in a horizontal position, at which carry out the transportation of the container.

A common disadvantage of the last two containers is that they are not provided for depreciation of SFA at the cross, the most dangerous for SFA direction. In addition, the known containers are made of all-metal, which implies a high complexity of manufacturing, and hence the high cost.

Known container for transporting and/or storage of spent nuclear fuel under the patent RU №2105364 C1, G 21 F 5/008, 1998 Known container has inner and outer tanks. The inner tank is designed for loading of SNF and made in the form of metal and concrete containers (IBC). The outer tank is a damping casing of the detachable elements made in the form of a drum with end walls and sides, including Central and terminations. Each end wall of the casing is installed radially races is than necessary, tubular elements, bonded respectively with an end element of the shell and to each other. The generatrix of each annular element shell installed other tubular members fastened respectively with an end element of the shell and to each other. Before transporting the container with spent fuel from the NPP for further storage or disposal of the inner tank - IBC is placed in the outer tank - damping cover. In case of a fall container with the vehicle, at any possible angle, cover the container with its tubular elements and connecting them to the power set of deformed, absorbing the kinetic energy of the fall and dampens shock. Thus, the equipment MBq damping casing provides the possibility of reducing to an acceptable level overload acting on posted in MBq of spent fuel assemblies in possible emergencies. In addition, the interior of the tank with the fuel volume to completely cover his jacket provides additional radiation protection during transportation in accordance with the requirements of normative documents.

The known device provides protection for the spent fuel from overload when dealing with IBC during transportation, but does not solve the problem of protection of SNF from overload when dealing with the IBC nutrias, for example in case of accidental fall of the SFA when loading last in the IBC.

A device for transporting and / or storing cargo at the patent RU No. 2133061 C1, G 21 F 5/00, 1999, the Known device comprises a container and dampers. In the container, put the protective cover connected with him adapter, ensuring the safety of cargo in normal operating conditions and deforming or collapsing in emergency situations. Geometrical parameters, stiffness and strength properties of the adapter shall be such that when its destruction or deformation of the load on the load does not exceed the allowable. The device provides higher security of the transported goods from damage, eliminating the need for its hardening, complicating the design of the cargo, and the cargo containing explosives, at the same time greatly increases and explosion safety of their transportation.

However, the known device has limited use.

The closest to the essential characteristics of the claimed invention is a metal and concrete containers for transporting and/or storage of spent assemblies TVEL nuclear reactors patent RU No. 2189648 C1 (G 21 F 5/008, 2002). Known metal and concrete container includes a housing with a bottom, GNC is Rennie and an external protective sealing lids inserted into the body cavity case with the Central cell and arranged around it evenly around the circumference of the peripheral cells to set the canisters of spent assemblies TVEL. The above-mentioned cell is formed coaxially spaced holes, which are made in exploded at the height of the diaphragms. The case is equipped with spaced around the diaphragm along its longitudinal axis shielding metal connecting the diaphragm. In the embodiment, the shielding metal structure made in the form of shells, each of which connects two adjacent diaphragms. In another embodiment, the shielding metal structure made in the form of sheet panels. Metal and concrete container contains mechanical damping elements are mounted around the circumference respectively on the upper and lower apertures of the cover with the outer side of the latter. Mechanical damping elements are mounted on the bottom of the diaphragm, are the base elements of the case that interacts with the bottom of the case. Mechanical damping elements are mounted on the upper diaphragm made with the possibility of interaction with internal protective sealing cover. Part of the damping elements mounted on the upper diaphragm simultaneously perform the role of a lifting element of the s cover. When the action on the container transverse overloading the role of damping elements are, in particular, the aperture communicating with the inner cylindrical surface of the container. Loaded into the container canisters equipped with its own mechanical damping elements

However, in the known device the diaphragm is set at a relatively large distance from one another that in the case of lateral loads (i.e. when the action on the container transverse overloads) leads to the loading of the canisters practically concentrated forces. Such loading does not preclude bending of individual cases and as a consequence of damage to the latter. In addition, in the known device is not provided for depreciation canisters at the last stop in a protective sealing cover. Noted deficiencies compromise the security of the handling packaging storage (i.e., IBC, loaded spent assemblies TVEL).

The problem solved by the invention is the creation of metal and concrete containers, providing the ability to safely transport and/or storage of spent fuel and increase security of canisters of spent assemblies fuel rod from damage under normal operation (storage, transportation), and in possible emergency situations.

This task resue the camping due to the fact, in metal and concrete container for transporting and/or storage of spent assemblies of fuel elements of nuclear reactors, comprising a housing with a bottom, an inner protective sealing cap inserted into the body cavity case with cells for installation of the canisters of spent assemblies of the fuel elements and damping elements communicating respectively with the said cover from its inner surface, with the bottom of the casing and with the inner wall of the housing, according to the invention the cover inside of the body cavity is selected from a predetermined gap relative to the inner wall of the casing. Between the inner wall of the housing and cover are installed side damping elements, each made in the form of a longitudinal rod, passing through holes made on the respective first and second sheet elements mounted on the height of the container at predetermined distances, respectively, on the inner wall of the housing and on the cover and located parallel to the bottom of the case. The first and second sheet elements in plan partially overlap and have the form, providing when mounting the container to freely download the cover to the body cavity by rotation of the cover relative to the Central (longitudinal) axis. Damping elements, interacting with internal protective ger is eitherwise cover, made in the form of spring elements, which are mounted on the latter opposite each corresponding cell of the cover with the opportunity to interact with the case in normal conditions, metal and concrete containers.

In the embodiment, the lateral damping elements are placed evenly around the circumference around the longitudinal axis of the container.

Together with this, the first and second sheet elements according to the height of the container is established through one.

In addition, the container may be provided with a reference damping elements for canisters.

Together with this reference damping elements for canisters can be installed in the lower part of the cover, and each made with the possibility of plastic deformation along the axis of the corresponding cell cover accidental loading of a canister installed in the past.

In another embodiment, the reference damping elements for canisters can be installed on the bottom of the casing opposite each corresponding cell of the case.

The technical result of the use of the invention is that it allows you to increase the safety of handling packaging storage (i.e., metal and concrete container loaded spent assemblies TVEL).

1 schematically shows a metal and concrete containers for transporting and/or storage of spent the Borok TVEL nuclear reactors, General view, a longitudinal section; figure 2 is the same cross-section along a-a in figure 1 (canisters of spent assemblies TVEL conventionally not shown); figure 3 - reference damping element for case, the element B in figure 1, an embodiment; figure 4 - side damping element (the connection of the cover with the housing wall of the container), the cross-section along G-G in figure 1 (canisters of spent assemblies TVEL conventionally not shown); figure 5 - end of the damping element mounted on the inner protective sealing cover, the element In figure 1.

Metal and concrete containers for transporting and/or storage of spent assemblies TVEL nuclear reactor includes a housing 1 with a bottom 2, a protective sealing cover 3-5, located one above the other on a common base (not shown)and inserted into cavity "a" of the housing 1 case (spacer bars) 6 with the Central cell "b" and placed around it evenly around the circumference of the peripheral cells "C" for installation of the canisters 7 of spent assemblies 8 TVEL. In the embodiment of the invention the exhaust Assembly of the fuel elements are placed (installed) in multiple canisters, which simplifies the handling of spent nuclear fuel. After installation of spent fuel assemblies fuel rod in the case 7 of the last seal, for example, through the "scalding" his cover. Canisters the size of which are stated in the Central and peripheral cells "b" and "C" of the cover 6. The number of cells in the case and their location are determined, in particular, the radiation and nuclear safety.

Case 6 inside cavity "a" of the housing 1 is installed with a predetermined gap relative to the inner wall d of the housing 1. Between the inner wall of the "d" case and the cover 6 are installed side damping elements 9, each made in the form of a longitudinal rod 10 passing through the through-hole is made on the leaf elements 11, 12, parallel to the bottom 2 and the installed height of the container at predetermined distances, respectively, on the cover 6 and the inner wall d of the housing 1. In the embodiment, the lateral damping elements 9 are evenly spaced around the circumference around the longitudinal axis of the container. Sheet elements 11 and 12 to the height of the cavity "a" of the casing is set through one, in terms of partially overlap and have the form, providing when mounting the container to freely download the cover to the body cavity by rotation of the cover relative to the Central (longitudinal) axis. The elements 11, 12 on the cover 6 and the inner wall d of the housing 1 is fixed, for example, by welding. The longitudinal rods 10 are passed through the corresponding through holes in the elements 11 and 12 to the stop in the bottom 2. Thus, using longitudinal CTE is sung 10 case 6 Rethimno connected to the housing 1. At the same time you fix the mutual position of the cover and the housing in the transverse plane of the container. The gap between the cover 6 and the inner wall d of the housing 1 is determined by the amount of movement of the cover relative to the housing, which is necessary to reduce (damping) acting on the body of the overloads to the permissible values for SNF (or canisters with SNF) in the event of a possible emergency loading of the container.

Metal and concrete container contains mechanical damping elements 13, interacting with internal protective sealing cover 3 from the inner surface, and the end of the damping elements that interact with the bottom 2 of the housing 1. Damping elements 13 are made in the form of spring elements (for example, packages of Belleville springs or sets of coil springs)that are installed on the inner sealing cover 3 opposite each corresponding cell of the cover 6 with the opportunity to interact with the case 7 in normal conditions, metal and concrete containers. Thus, the operation of the IBC provides reliable fixation (preload) canisters. The role of mechanical damping elements that interact with the bottom 2 of the housing 1, perform end supporting elements "e" case 6.

In the embodiment, the metal and concrete of the container provided with parnami damping elements 14 to the canister 7. A possible embodiment of the invention, when the reference damping elements 14 for canisters installed in the lower part of the cover 6, and each made with the possibility of plastic deformation along the longitudinal axis of the corresponding cell in case of emergency loading case 7 installed in the cell. In another embodiment (not shown) supporting the damping elements for canisters can be installed on the bottom 2 of the housing 1 opposite each corresponding cell of the cover 6. In this embodiment, the reference damping elements can be performed, for example, in the form of a hollow shell with ribs or spring elements (not shown).

Possible that such damping (shock absorbing) elements made in one piece with the case, for example, in the form of removable support with in-built elastic element (not shown).

The use of metal and concrete containers in the industry is as follows.

When mounting the container to ensure smooth loading of the cover 6 into the cavity of the housing 1 case using the appropriate lifting means (not shown) rotates about its Central (longitudinal) axis so that the sheet elements 11 installed on the case, the plan does not overlap the sheet e is cops 12, installed on the inner wall d of the housing 1. Case 6 is loaded into cavity "a" of the housing 1 until it stops supporting elements "e" in the bottom 2 and rotates relative to the Central axis of the cover at a desired position at which the sheet elements 11, 12 in plan partially overlap each other, and the through-hole is made in the respective elements 11 and 12 are arranged coaxially. Then the case Rethimno connected to housing 1 by means of longitudinal rods 10, which are all the way into the bottom 2 are passed through the corresponding through holes made on the leaf elements 11 and 12. Thus, the case is installed with a predetermined gap relative to the inner walls of the "d" building. In the case of 6 canisters set 7 of spent assemblies 8 TVEL (SNF) a nuclear reactor that can withstand a certain time into the pool of water.

Accidental falling of the case 7 in the cell cover 6 (for example, in case of failure of the load-handling elements of the lifting means) in an embodiment of the invention is the collision of canister with the support of the damping element 14. The damping stroke is provided by plastically deformable shells with edges, the cross section and the height of which is chosen so that the interaction of the reference damping element case 7 comes with power, obespechivaya the braking case with acceleration (overload), permissible under the terms of the durability of the exhaust Assembly of the fuel element.

After downloading IBC closes the inner protective sealing cover 3, tightened the bolt securing it and check the tightness of the connection of the cover with the chassis 1. In the process of closing the inner protective sealing cover 3 mounted therein a damping spring elements 13 are in contact with the covers of the respective canisters 7 and tight canisters to the corresponding reference damping elements 14. Similarly closes protective sealing cover 4 and check the tightness of its connection with the housing 1. Protective sealing cover 3, and 4 form two circuits (barrier) protection. The design of the container allows the installation of additional external protective sealing cover 5. In the embodiment of the invention, the cover 5 is made in the form of a sheet, which is on the perimeter of the weld to one basis covers. Extra protective sealing cover due to the possibility of reducing the tightness of the sealing caps 3 and 4 in terms of long-term radiation and thermal Cycling effects in the process of spent fuel storage and the requirement of reliability and ecological safety of dry cask storage.

Due to the presence of damping (spring) elements 13 and constant preload canisters 7 to the reference damping elements 14 is provided fixation of the canister relative to the body 1 of the container and prevents movement of the canisters when overload (for example, in the case of sudden braking) during transportation of the container in a horizontal position, for example, by rail. Given that the movement of the box relative to the housing 1 would be possible vibro-impact loading case and its depressurization, these damping (spring) elements, ultimately, increase radiation safety handling packaging storage.

In case of accidental fall of the IBC on the side surface of the housing of the damping stroke and reducing overload acting on the case (the spacer grid) 6, is due to the bending of the longitudinal rods 10, the bearing of each of which in this case is similar to the circuit supporting multi-span beams with transverse loads between supports. The bending of the longitudinal rod 10 occurs when the transverse displacement of the respective sheet elements 11 mounted on the cover, relative to the sheet elements 12 mounted on the inner wall d of the housing 1. The deformation of the longitudinal rods 10, followed by the formation of plastic hinges in the knots of their mates with sheet items, respectively 11 and 12, provides the necessary damping of transverse shock loads that re which are stated on the cover (the spacer bars), reduces operating in case of congestion to an acceptable level.

In the embodiment of the invention metal and concrete container during transportation to the place of final storage (disposal) of spent nuclear fuel to prevent MBq SNF from destruction in case of possible emergency situations and improving occupational radiation protection during transport insert into split damping casing (not shown).

Thus, due to the peculiarities of performance of metal and concrete containers for transportation and/or storage of spent assemblies of fuel elements of nuclear reactors the invention allows to create metal and concrete container, providing the ability to safely transport and/or storage of spent fuel and increase security of canisters of spent assemblies fuel rod from damage under normal operation (storage, transportation), and in possible emergency situations, and can help improve the security of handling packaging storage (i.e., metal and concrete container loaded spent assemblies TVEL).

1. Metal and concrete containers for transporting and/or storage of spent assemblies of fuel elements of nuclear reactors, comprising a housing with a bottom, an inner protective sealing cap that is inserted into the cavity of the housing h is a hall with cells for installation of the canisters of spent assemblies TVEL, damping elements, interacting, respectively, with the said cover from its inner surface, with the bottom of the casing and with the inner wall of the housing, characterized in that the cover inside of the body cavity is selected from a predetermined gap relative to the inner wall of the casing, while between the latter and the cover are installed side damping elements, each made in the form of a longitudinal rod, passing through holes made on the respective first and second sheet elements mounted on the height of the container at predetermined distances, respectively, on the inner wall of the housing and on the cover and located parallel to the bottom of the case, the first and the second sheet items in terms of partially overlap and have the form, providing when mounting the container to freely download the cover to the body cavity by rotation of the cover relative to its Central axis, and the damping elements, interacting with internal protective sealing cover made in the form of spring elements, which are mounted on the latter, opposite each corresponding cell of the cover with the opportunity to interact with the case in normal conditions, metal and concrete containers.

2. Metal and concrete container according to claim 1, characterized who eat what side damping elements are placed evenly around the circumference around the longitudinal axis of the container.

3. Metal and concrete container according to claim 1, characterized in that the first and second sheet elements according to the height of the container is established through one.

4. Metal and concrete container according to claim 1, characterized in that it has the support of the damping elements for canisters.

5. Metal and concrete container according to claim 4, characterized in that the supporting damping elements for canisters installed in the lower part of the cover, and each made with the possibility of plastic deformation along the axis of the corresponding cell cover accidental loading of a canister installed in the past.

6. Metal and concrete container according to claim 4, characterized in that the supporting damping elements for canisters installed on the bottom of the casing opposite each corresponding cell of the case.



 

Same patents:

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: 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: 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 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: 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: 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: 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: 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: 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

The invention relates to the field of nuclear engineering

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!