CA2251895C - Container for nuclear fuel transportation - Google Patents
Container for nuclear fuel transportation Download PDFInfo
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- CA2251895C CA2251895C CA002251895A CA2251895A CA2251895C CA 2251895 C CA2251895 C CA 2251895C CA 002251895 A CA002251895 A CA 002251895A CA 2251895 A CA2251895 A CA 2251895A CA 2251895 C CA2251895 C CA 2251895C
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- container
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- neutron absorbing
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
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Abstract
A transport container for nuclear fuel is provided, comprising an outer container provided with internal insulation, the insulation defining an internal cavity, the cavity receiving a plurality of fuel containers, wherein the internal volume of the fuel containers is at least 5 % of the external volume of the outer container. The container allows substantially higher volume proportions of enriched fuel to be safely transported than is possible with prior containers.
Description
CONTAINER FOR- NUCLEAR FUEL;TRANSPORTAT10N
This invention concerns improvements in and relating to fuel transportation, particularly but not exclusively relating to enriched nuclear fuels.
Nuclear fuels, such as enriched uranium or mixed oxide forms, frequently need to be transported between sites, for instance the enrichment site and the fuel rod production site. The fuel is normally in the form of pellets or powder at this stage.
International standards apply, requiring certain levels of thermal insulation and structural strength. A major concern is criticality control. The mass of enriched fuel within the transport container must be strictly limited to ensure that a criticality event does not occur. This single requirement places astringent limit on the volume of fuel which can be transported in any given volume of a transport container. In this regard, the transportation of nuclear fuel differs significantly from transportation of other radioactive materials. Radioactive waste is of a far lower enrichment, thus facilitating transport of greater volumes in proximity with one another. In assembled fuel rods on the other hand, the volume of~fuel when compared with the overall fuel rod and supporting structure volume is very low.
Present systems usually consist of a cylindrical drum provided with one or more layers of wood on all sides, the wood defining a central recess into which a single cylinder containing the enriched fuel is placed.
The fuel containing volume of the inner drum is very low compared with the volume of the outer drum. As a consequence the transportation of fuel takes up a considerable amount of space. The commercial considerations of this apply as they do . to any transportation procedure. Additionally the cylindrical nature of the unit presents handling and stability problems.
This invention concerns improvements in and relating to fuel transportation, particularly but not exclusively relating to enriched nuclear fuels.
Nuclear fuels, such as enriched uranium or mixed oxide forms, frequently need to be transported between sites, for instance the enrichment site and the fuel rod production site. The fuel is normally in the form of pellets or powder at this stage.
International standards apply, requiring certain levels of thermal insulation and structural strength. A major concern is criticality control. The mass of enriched fuel within the transport container must be strictly limited to ensure that a criticality event does not occur. This single requirement places astringent limit on the volume of fuel which can be transported in any given volume of a transport container. In this regard, the transportation of nuclear fuel differs significantly from transportation of other radioactive materials. Radioactive waste is of a far lower enrichment, thus facilitating transport of greater volumes in proximity with one another. In assembled fuel rods on the other hand, the volume of~fuel when compared with the overall fuel rod and supporting structure volume is very low.
Present systems usually consist of a cylindrical drum provided with one or more layers of wood on all sides, the wood defining a central recess into which a single cylinder containing the enriched fuel is placed.
The fuel containing volume of the inner drum is very low compared with the volume of the outer drum. As a consequence the transportation of fuel takes up a considerable amount of space. The commercial considerations of this apply as they do . to any transportation procedure. Additionally the cylindrical nature of the unit presents handling and stability problems.
According to a first aspect of the invention we provide a transportable container for nuclear fuel, the container comprising an outer container provided with internal insulation, the insulation defining an internal cavity, the cavity receiving a plurality of fuel containers, wherein the internal volume of the fuel containers is at least 5% of the external volume of the outer container.
A container having this level of fuel volume to overall volume has not previously been achieved. The present invention also allows this level to be reached whilst meeting the necessary criticality, insulation and other standards.
Preferably the internal volume of the fuel container is at least 10% of that of the external volume of the outer container. A level of at least 15%, 20% or 25% is preferred.
Levels of at least 30%, 35% or even 40% may be reached. Any increase in fuel volume to overall container volume is significant in reducing transportation costs and the capital costs involved in providing the strong fuel containers.
Preferably the outer container is formed with a steel and most preferably stainless steel skin. The corners and/or edges of the outer container may be provided with strengthening elements. These may take the form of L-shaped sections. The outer container is preferably provided with feet.
The outer container is preferably provided with a lid. The lid is preferably releasably fastened to the outer container.
Clamps attached to the outer container and releasably engageable with the periphery of the lid are preferred. The clamps may also be releasably engaged with the outer container.
The lid may be provided with handles or other forms of engagement for removal of the lid.
It is particularly preferred that the lid be received within the perimeter of two or more projections from the outer container. The strengthening elements projecting above the top of the container may define this perimeter.
Preferably the insulating material is provided in a series of . discrete layers. One or more base layers and/or one or more wall layers for each wall may be provided. The lid insulation may be mounted on the metal lid or may be provided separately.
If provided separately a pair of interlinking sections may be provided.
The insulating layer is preferably thermally insulating and/or neutron absorbing. Calcium silicate offers a preferred insulating material. One or more different materials may be used together or in a sandwich style structure.
Preferably the insulation layer defines the boundaries of a single internal cavity. A rectilinear cavity is preferred.
The internal cavity is preferably provided with a correspondingly shaped single unit internal container comprising four side walls and a base. The internal container is preferably made of steel, boronated steel, or most particularly stainless steel.
In one form the internal container is preferably divided up into a series of chambers. The chambers may be defined by one or more elements crossing the internal cavity or container.
Preferably the elements are plates spanning the full height, or at least substantially the full height, of the internal volume.
Preferably one or more elements span the internal volume in different directions, most preferably at substantially 90 degrees to one another. Preferably the plates are substantially vertically provided. It is particularly preferred that two plates cross the internal cavity in each of two directions at 90 degrees to one another. Preferably the internal volume is divided up into nine substantially equivalent chambers.
WO 97/42b36 PCT/GB97/01197 In a second alternative form, the internal cavity may be fitted with elements such as plates spanning the full height of the internal volume to define an internal container. The chambers again being defined by one or more elements crossing the internal cavity. A base plate may be provided on the base insulating layer to define a base for the internal volume. A
top plate may also be provided. Side plates may also be provided to define the sides of the chambers.
One or more of the base, top or dividing elements or plates may be formed of metal. Steel and in particular stainless steel or boronated steel.
The base, side and dividing plates or elements of the single unit internal container is alternatively provided as a separate unit to the insulating layers and outer container.
In a further alternative form the internal cavity may be fitted with a plurality of sleeve elements. Preferably the sleeve elements are adapted to receive fuel containers or pails. The sleeves may be continuous or substantially continuous.
Preferably the sleeves are of circular cross-section.
Preferably the sleeves internal diameter is substantially equivalent to the external diameter of the fuel containers or pails. Preferably the sleeves are rigidly separated from one another. The sleeves may be rigidly separated by mounting on a base plate.
Preferably the sleeves are discrete from one another around their entire periphery. Four or more, and preferably 8 or 9 such sleeves may be provided within the internal cavity.
The base plate may be attached to one or more side plates or elements. The side plates or elements may form walls corresponding to the walls of the internal cavity. An internal container may thus be provided.
A container having this level of fuel volume to overall volume has not previously been achieved. The present invention also allows this level to be reached whilst meeting the necessary criticality, insulation and other standards.
Preferably the internal volume of the fuel container is at least 10% of that of the external volume of the outer container. A level of at least 15%, 20% or 25% is preferred.
Levels of at least 30%, 35% or even 40% may be reached. Any increase in fuel volume to overall container volume is significant in reducing transportation costs and the capital costs involved in providing the strong fuel containers.
Preferably the outer container is formed with a steel and most preferably stainless steel skin. The corners and/or edges of the outer container may be provided with strengthening elements. These may take the form of L-shaped sections. The outer container is preferably provided with feet.
The outer container is preferably provided with a lid. The lid is preferably releasably fastened to the outer container.
Clamps attached to the outer container and releasably engageable with the periphery of the lid are preferred. The clamps may also be releasably engaged with the outer container.
The lid may be provided with handles or other forms of engagement for removal of the lid.
It is particularly preferred that the lid be received within the perimeter of two or more projections from the outer container. The strengthening elements projecting above the top of the container may define this perimeter.
Preferably the insulating material is provided in a series of . discrete layers. One or more base layers and/or one or more wall layers for each wall may be provided. The lid insulation may be mounted on the metal lid or may be provided separately.
If provided separately a pair of interlinking sections may be provided.
The insulating layer is preferably thermally insulating and/or neutron absorbing. Calcium silicate offers a preferred insulating material. One or more different materials may be used together or in a sandwich style structure.
Preferably the insulation layer defines the boundaries of a single internal cavity. A rectilinear cavity is preferred.
The internal cavity is preferably provided with a correspondingly shaped single unit internal container comprising four side walls and a base. The internal container is preferably made of steel, boronated steel, or most particularly stainless steel.
In one form the internal container is preferably divided up into a series of chambers. The chambers may be defined by one or more elements crossing the internal cavity or container.
Preferably the elements are plates spanning the full height, or at least substantially the full height, of the internal volume.
Preferably one or more elements span the internal volume in different directions, most preferably at substantially 90 degrees to one another. Preferably the plates are substantially vertically provided. It is particularly preferred that two plates cross the internal cavity in each of two directions at 90 degrees to one another. Preferably the internal volume is divided up into nine substantially equivalent chambers.
WO 97/42b36 PCT/GB97/01197 In a second alternative form, the internal cavity may be fitted with elements such as plates spanning the full height of the internal volume to define an internal container. The chambers again being defined by one or more elements crossing the internal cavity. A base plate may be provided on the base insulating layer to define a base for the internal volume. A
top plate may also be provided. Side plates may also be provided to define the sides of the chambers.
One or more of the base, top or dividing elements or plates may be formed of metal. Steel and in particular stainless steel or boronated steel.
The base, side and dividing plates or elements of the single unit internal container is alternatively provided as a separate unit to the insulating layers and outer container.
In a further alternative form the internal cavity may be fitted with a plurality of sleeve elements. Preferably the sleeve elements are adapted to receive fuel containers or pails. The sleeves may be continuous or substantially continuous.
Preferably the sleeves are of circular cross-section.
Preferably the sleeves internal diameter is substantially equivalent to the external diameter of the fuel containers or pails. Preferably the sleeves are rigidly separated from one another. The sleeves may be rigidly separated by mounting on a base plate.
Preferably the sleeves are discrete from one another around their entire periphery. Four or more, and preferably 8 or 9 such sleeves may be provided within the internal cavity.
The base plate may be attached to one or more side plates or elements. The side plates or elements may form walls corresponding to the walls of the internal cavity. An internal container may thus be provided.
Preferably one or more of the sleeves are at least in part surrounded by a neutron absorbing material. Preferably one or more of the sleeves, and most preferably all of the sleeves, are surrounded by a neutron absorbing material around their entire circumference. A neutron absorbing material may optionally be provided around one or both ends of one or more of the sleeves.
Preferably the neutron absorbing material is a resin based material. Preferably the neutron absorbing material is fire resistant. Preferably the resin based material is loaded with, up to 6.5% boron, or up to 5% boron, and more preferably up to 2.5% boron. Preferably the resin occupies at least 50% of the non-sleeve volume of the internal cavity. The neutron absorbing material may fill the entire non-sleeve volume of the internal cavity or lower density materials may be incorporated, such as polystyrene.
The internal container is preferably provided with a lid.
Preferably the fuel containers or pails comprise cylindrical drums. Preferably releasable lids are provided. The release mechanism for~the lid is preferably contained within the plan profile of the container in the sealed position to minimise space.
The fuel preferably occupies at least 50% of the fuel container and may occupy 60, 70, 80, 90, 95% or any individual % value over 50%.
The fuel may be provided within the fuel containers in plastic bags, such as polythene.
The fuel may be in pellet, powder or other form. Unirradiated enriched uranium may be the fuel. The provision of uranium at substantially up to 5% enrichment may be used. A density of around 1.4 g/cm3 may be used. In such a case each individual fuel container may have a volume of between 15 and 20 litres, for instance 17.3 litres.
The boron content of any one of the insulator layers, internal divisions, sleeves, fuel containers, or remaining chamber space may be increased to give increased absorbtion.
Fuel containers are preferably provided in more than three of the chambers or sleeves. The provision of the fuel containers in peripheral chambers or sleeves and most preferably all the peripheral chambers or sleeves is envisaged. One or more of the chambers or sleeves may be provided with a neutron absorber. Preferably the neutron absorber is provided in a unit corresponding in dimensions to the chamber or sleeve receiving it. The provision of polythene as the neutron absorber is preferred. The polythene absorber may be in a steel container corresponding to the size and shape of the chamber or sleeve receiving it. The absorber may also be provided with a lid corresponding with the chamber or sleeve into which the absorber is placed in order to assist in retaining the absorber within the chamber or sleeve. The lid is preferably of steel.
In a particularly preferred form the container comprises an outer container with a removable lid, the outer container being provided with an insulating layer on each wall and base, a further removable insulating layer being provided between the lid and the internal cavity of the container in use, the internal cavity being divided into a plurality of chambers, a fuel container being provided in at least three of the chambers and at least one of the chambers being provided with a neutron absorbing material.
In an alternative particularly preferred form the container comprises an outer container with removable lid, the outer container being provided with an insulating layer on each wall and the base, a further removable insulating layer being provided on the lid, the insulating layers defining an internal cavity of the container, the internal cavity being provided with a plurality of sleeves, a fuel container being provided in at least 3 of the sleeves and the sleeves being at least - partially surrounded by a neutron absorbing material.
It is preferred that only one fuel container or pail be provided in each chamber.
A particularly preferred arrangement provides a rectangular plan aperture divided into nine chambers, three chambers by three chambers. Preferably the fuel containers are provided in the peripheral chambers. A neutron absorbing material may be substituted in the central chamber and/or one or more of the other chambers as required.
In a further particularly preferred arrangement a rectilinear plan internal cavity may be provided with nine sleeve elements, in a three by three sleeve element arrangement. Preferably fuel containers are provided in all the periphery sleeves and most preferably in all of the sleeves. A neutron absorbing material may be substituted in one or more of the chambers.
Various embodiments of the invention will now be illustrated, by way of example only, and with reference to the accompanying drawings in which:-Figure 1 shows a perspective view of a container according to a f first embodiment of the invention cut away to show the fuel containers in the container;
Figure 2 shows a cross-sectional side view of Figure 1;
Figure 3 shows a pail load in plan view;
Figure 4 shows a side view of the container of Figure 1;
_g_ Figure 5 shows a plan view of a closed container according to the ffirst embodiment of the invention partly cut away to show the fuel containers in the container of the invention;
Figure 6 shows one embodiment of a fuel container or pail for use in the present inventions outer container;
Figure 6A shows a plan view of a fuel container or pail of Figure 6;
Figure 7 shows a perspective view of the container according to a second embodiment of the invention, cut away to show the fuel containers in the container;
Figure 8 shows a pail load in plan view; and Figure 9 shows a cross-sectional side view along axis XX of Figure 8.
The container as illustrated in Figure 1 has the general form of a rectangular box. The container 1 is defined by four vertically arranged walls 2 and a base wall 3. The walls are provided at the corner joins with strengthening elements 4 in the form of L-shaped strips. The vertical strengthening elements 4 have portions 6 which extend beyond the lid 8 of the container. Feet are provided on each corner of the base and engage with the portion 6 for easy and stable stacking.
The outer skin forming the walls 2, base 3 and separate lid 8 are made of stainless steel.
A peripheral flange 12 is provided around the container. The lid 8 is dimensioned to be slidably received within the boundaries of the L-shaped elements 4. The lid 8 has a flange 16 which . corresponds with the peripheral flange 12 of the container.
Handles 14 on the lid aid in its removal and insertion.
In the closed and retained position shown the lid 8 is retained by a series of quick release nuts and bolts 18 which engage corresponding openings in the flange 16 of the lid 8. The lid is provided with suitable seals to prevent any ingress of water.
Next to the steel skin the container is provided with a substantial thickness of a thermal insulator 20 formed from calcium silicate. This layer is provided in a series of sections, see Figure 2. The materials provision in solid sections ensures accurate positioning during assembly and use.
A single base layer of insulator 22 and four wall sections 24 line the container itself. When the container is loaded, as described below, a two piece insulating top layer is applied.
These two pieces 26, 28 are shaped to interconnect with one another.
The rectangular box defined by the interior surfaces of the insulating layers receives an internal container 30A having four walls and a base and also made of boronated steel or stainless steel. This container 30A is also provided with a lid 31 as shown in Figure 1. As seen in Figure 3 the container consists of a series of interlocking vertical walls 30 made of boronated steel/stainless steel. The container 30A has two pairs of internal walls 30 at 90 degrees to one another defining nine chambers 32 within the pail load.
In use within each of the eight peripheral chambers a fuel drum or pail 36 is received. The central chamber 32A is provided with a polythene neutron absorber 38. The absorber 38 is itself provided in a steel container (not shown) which corresponds with the shape of the chamber 32 into which it is to be fitted. A lid is provided on the top of the absorber to retain the absorber in place in the chamber 32A.
Once the internal container 30A has received all eight fuel drums 36, and the container 1 is sealed by applying the lid 31, the insulating top layer 26, 28, arid the external lid 8. The lid 8 is secured to the container 1 by the quick release nuts and bolts 18.
The fuel containing drum 36, as illustrated in Figure 6, consists of a stainless steel cylinder wall 40 with a base plate 42 and releasable lid 44. The lid 44 is provided with a standard internal lever clamp band 46 which enables the lid to be secured to the fuel drum 36. The provision of the internal lever clamp band 46 within the outline of the drum 36 is important to minimise the space taken up. In the closed state the drum 36 is water tight avoiding any water ingress.
The fuel 55 in either powder of pellet form is contained within polythene bags. The polythene bags filled with fuel are placed in a larger polythene bag which is placed in the drum. Once the larger bag is full this is then closed. The drum is then sealed with the lid 44. The fuel may typically be enriched uranium destined to form fuel rods.
In the second embodiment of the invention illustrated in Figure 7 the container 100 is once again in the form of a rectangular box. The external container 100 is defined in a similar manner to the container of the first embodiment by vertically arranged side walls 102 and a base wall 103. Other equivalent elements are numbered with reference numerals corresponding to those used in the first embodiment increased by 100.
Thus the strengthening elements, feet, peripheral flange, lid fixing and lid alignment are provided in a similar manner.
The container 100 is also provided with substantial thickness of thermal insulator 120 provided by a base section, wall sections and a section optionally mounted on the lid in a similar manner to the first embodiment of the invention.
The arrangement within the internal cavity defined by these insulating layers differs, however.
WO 97/42b36 PCT/GB97/01197 The cavity is provided with a series of stainless steel sleeves 150 which are rigidly mounted on a bottom plate standing on the base layer insulation. The cylindrical sleeves are hollow and have an internal dimension configured to snugly correspond to the external dimensions of the fuel containers 152 shown inserted in the sleeves 150. Nine sleeves 150 are used in a three by three arrangement with a fuel container 152 being positioned in each in use.
The fuel containers are generally of the type illustrated in Figure 6 and 6A above, but include external fasteners projecting beyond the plan of the fuel containers.
As shown in Figures 7, 8 and 9 the sleeves 150 are surrounded by a neutron absorbing material 158. This material is introduced to the volume surrounding the sleeves during the manufacture of the portion of the assembly filling the internal cavity by pouring in a liquid resin which is then allowed to harden. A resin tight unit is preferred as defining this cavity. The resin is loaded with boron preferably to a level of 2 o to provide the desired neutron absorbing capability. A boron loading up to 6.5 wt%
and/or a lead loading up to 15 wt% may be provided. The material offers between 1 x 1022 and 1 x 1023 hydrogen atoms/cm3.
To reduce the cost and weight of the neutron absorbing material, typically 1.68g/cm3 lighter materials such as polystyrene can be incorporated in portions where the neutron absorbing volume of material would otherwise be excessive. Thus at locations 162 between sets of 4 sleeves and externally at the corner locations 164 and locations 166 between the pairs of sleeves the neutron material may be replaced with the lighter material. This does not affect the neutron absorbing capability of the container.
The fuel containing drums 152 and the manner in which the fuel, as powder or pellets is provided within them is as described above for the first embodiment of the invention.
The present invention allows approximately 20% - 40% of the outer container volume to be occupies by fuel 55 and yet still meets the necessary standards. This compares favourably with prior art systems. An increased payload is thus provided successfully.
The use of stainless steel and the modular nature of the assembly assists in refurbishment and any cleaning stages required such as decontamination.
Preferably the neutron absorbing material is a resin based material. Preferably the neutron absorbing material is fire resistant. Preferably the resin based material is loaded with, up to 6.5% boron, or up to 5% boron, and more preferably up to 2.5% boron. Preferably the resin occupies at least 50% of the non-sleeve volume of the internal cavity. The neutron absorbing material may fill the entire non-sleeve volume of the internal cavity or lower density materials may be incorporated, such as polystyrene.
The internal container is preferably provided with a lid.
Preferably the fuel containers or pails comprise cylindrical drums. Preferably releasable lids are provided. The release mechanism for~the lid is preferably contained within the plan profile of the container in the sealed position to minimise space.
The fuel preferably occupies at least 50% of the fuel container and may occupy 60, 70, 80, 90, 95% or any individual % value over 50%.
The fuel may be provided within the fuel containers in plastic bags, such as polythene.
The fuel may be in pellet, powder or other form. Unirradiated enriched uranium may be the fuel. The provision of uranium at substantially up to 5% enrichment may be used. A density of around 1.4 g/cm3 may be used. In such a case each individual fuel container may have a volume of between 15 and 20 litres, for instance 17.3 litres.
The boron content of any one of the insulator layers, internal divisions, sleeves, fuel containers, or remaining chamber space may be increased to give increased absorbtion.
Fuel containers are preferably provided in more than three of the chambers or sleeves. The provision of the fuel containers in peripheral chambers or sleeves and most preferably all the peripheral chambers or sleeves is envisaged. One or more of the chambers or sleeves may be provided with a neutron absorber. Preferably the neutron absorber is provided in a unit corresponding in dimensions to the chamber or sleeve receiving it. The provision of polythene as the neutron absorber is preferred. The polythene absorber may be in a steel container corresponding to the size and shape of the chamber or sleeve receiving it. The absorber may also be provided with a lid corresponding with the chamber or sleeve into which the absorber is placed in order to assist in retaining the absorber within the chamber or sleeve. The lid is preferably of steel.
In a particularly preferred form the container comprises an outer container with a removable lid, the outer container being provided with an insulating layer on each wall and base, a further removable insulating layer being provided between the lid and the internal cavity of the container in use, the internal cavity being divided into a plurality of chambers, a fuel container being provided in at least three of the chambers and at least one of the chambers being provided with a neutron absorbing material.
In an alternative particularly preferred form the container comprises an outer container with removable lid, the outer container being provided with an insulating layer on each wall and the base, a further removable insulating layer being provided on the lid, the insulating layers defining an internal cavity of the container, the internal cavity being provided with a plurality of sleeves, a fuel container being provided in at least 3 of the sleeves and the sleeves being at least - partially surrounded by a neutron absorbing material.
It is preferred that only one fuel container or pail be provided in each chamber.
A particularly preferred arrangement provides a rectangular plan aperture divided into nine chambers, three chambers by three chambers. Preferably the fuel containers are provided in the peripheral chambers. A neutron absorbing material may be substituted in the central chamber and/or one or more of the other chambers as required.
In a further particularly preferred arrangement a rectilinear plan internal cavity may be provided with nine sleeve elements, in a three by three sleeve element arrangement. Preferably fuel containers are provided in all the periphery sleeves and most preferably in all of the sleeves. A neutron absorbing material may be substituted in one or more of the chambers.
Various embodiments of the invention will now be illustrated, by way of example only, and with reference to the accompanying drawings in which:-Figure 1 shows a perspective view of a container according to a f first embodiment of the invention cut away to show the fuel containers in the container;
Figure 2 shows a cross-sectional side view of Figure 1;
Figure 3 shows a pail load in plan view;
Figure 4 shows a side view of the container of Figure 1;
_g_ Figure 5 shows a plan view of a closed container according to the ffirst embodiment of the invention partly cut away to show the fuel containers in the container of the invention;
Figure 6 shows one embodiment of a fuel container or pail for use in the present inventions outer container;
Figure 6A shows a plan view of a fuel container or pail of Figure 6;
Figure 7 shows a perspective view of the container according to a second embodiment of the invention, cut away to show the fuel containers in the container;
Figure 8 shows a pail load in plan view; and Figure 9 shows a cross-sectional side view along axis XX of Figure 8.
The container as illustrated in Figure 1 has the general form of a rectangular box. The container 1 is defined by four vertically arranged walls 2 and a base wall 3. The walls are provided at the corner joins with strengthening elements 4 in the form of L-shaped strips. The vertical strengthening elements 4 have portions 6 which extend beyond the lid 8 of the container. Feet are provided on each corner of the base and engage with the portion 6 for easy and stable stacking.
The outer skin forming the walls 2, base 3 and separate lid 8 are made of stainless steel.
A peripheral flange 12 is provided around the container. The lid 8 is dimensioned to be slidably received within the boundaries of the L-shaped elements 4. The lid 8 has a flange 16 which . corresponds with the peripheral flange 12 of the container.
Handles 14 on the lid aid in its removal and insertion.
In the closed and retained position shown the lid 8 is retained by a series of quick release nuts and bolts 18 which engage corresponding openings in the flange 16 of the lid 8. The lid is provided with suitable seals to prevent any ingress of water.
Next to the steel skin the container is provided with a substantial thickness of a thermal insulator 20 formed from calcium silicate. This layer is provided in a series of sections, see Figure 2. The materials provision in solid sections ensures accurate positioning during assembly and use.
A single base layer of insulator 22 and four wall sections 24 line the container itself. When the container is loaded, as described below, a two piece insulating top layer is applied.
These two pieces 26, 28 are shaped to interconnect with one another.
The rectangular box defined by the interior surfaces of the insulating layers receives an internal container 30A having four walls and a base and also made of boronated steel or stainless steel. This container 30A is also provided with a lid 31 as shown in Figure 1. As seen in Figure 3 the container consists of a series of interlocking vertical walls 30 made of boronated steel/stainless steel. The container 30A has two pairs of internal walls 30 at 90 degrees to one another defining nine chambers 32 within the pail load.
In use within each of the eight peripheral chambers a fuel drum or pail 36 is received. The central chamber 32A is provided with a polythene neutron absorber 38. The absorber 38 is itself provided in a steel container (not shown) which corresponds with the shape of the chamber 32 into which it is to be fitted. A lid is provided on the top of the absorber to retain the absorber in place in the chamber 32A.
Once the internal container 30A has received all eight fuel drums 36, and the container 1 is sealed by applying the lid 31, the insulating top layer 26, 28, arid the external lid 8. The lid 8 is secured to the container 1 by the quick release nuts and bolts 18.
The fuel containing drum 36, as illustrated in Figure 6, consists of a stainless steel cylinder wall 40 with a base plate 42 and releasable lid 44. The lid 44 is provided with a standard internal lever clamp band 46 which enables the lid to be secured to the fuel drum 36. The provision of the internal lever clamp band 46 within the outline of the drum 36 is important to minimise the space taken up. In the closed state the drum 36 is water tight avoiding any water ingress.
The fuel 55 in either powder of pellet form is contained within polythene bags. The polythene bags filled with fuel are placed in a larger polythene bag which is placed in the drum. Once the larger bag is full this is then closed. The drum is then sealed with the lid 44. The fuel may typically be enriched uranium destined to form fuel rods.
In the second embodiment of the invention illustrated in Figure 7 the container 100 is once again in the form of a rectangular box. The external container 100 is defined in a similar manner to the container of the first embodiment by vertically arranged side walls 102 and a base wall 103. Other equivalent elements are numbered with reference numerals corresponding to those used in the first embodiment increased by 100.
Thus the strengthening elements, feet, peripheral flange, lid fixing and lid alignment are provided in a similar manner.
The container 100 is also provided with substantial thickness of thermal insulator 120 provided by a base section, wall sections and a section optionally mounted on the lid in a similar manner to the first embodiment of the invention.
The arrangement within the internal cavity defined by these insulating layers differs, however.
WO 97/42b36 PCT/GB97/01197 The cavity is provided with a series of stainless steel sleeves 150 which are rigidly mounted on a bottom plate standing on the base layer insulation. The cylindrical sleeves are hollow and have an internal dimension configured to snugly correspond to the external dimensions of the fuel containers 152 shown inserted in the sleeves 150. Nine sleeves 150 are used in a three by three arrangement with a fuel container 152 being positioned in each in use.
The fuel containers are generally of the type illustrated in Figure 6 and 6A above, but include external fasteners projecting beyond the plan of the fuel containers.
As shown in Figures 7, 8 and 9 the sleeves 150 are surrounded by a neutron absorbing material 158. This material is introduced to the volume surrounding the sleeves during the manufacture of the portion of the assembly filling the internal cavity by pouring in a liquid resin which is then allowed to harden. A resin tight unit is preferred as defining this cavity. The resin is loaded with boron preferably to a level of 2 o to provide the desired neutron absorbing capability. A boron loading up to 6.5 wt%
and/or a lead loading up to 15 wt% may be provided. The material offers between 1 x 1022 and 1 x 1023 hydrogen atoms/cm3.
To reduce the cost and weight of the neutron absorbing material, typically 1.68g/cm3 lighter materials such as polystyrene can be incorporated in portions where the neutron absorbing volume of material would otherwise be excessive. Thus at locations 162 between sets of 4 sleeves and externally at the corner locations 164 and locations 166 between the pairs of sleeves the neutron material may be replaced with the lighter material. This does not affect the neutron absorbing capability of the container.
The fuel containing drums 152 and the manner in which the fuel, as powder or pellets is provided within them is as described above for the first embodiment of the invention.
The present invention allows approximately 20% - 40% of the outer container volume to be occupies by fuel 55 and yet still meets the necessary standards. This compares favourably with prior art systems. An increased payload is thus provided successfully.
The use of stainless steel and the modular nature of the assembly assists in refurbishment and any cleaning stages required such as decontamination.
Claims (65)
1. A transportable container for nuclear fuel, comprising:
an outer container bounding an interior and defining an overall volume;
a thermal insulation material disposed within the interior bounded by the outer container, the thermal insulation material bounding an internal cavity;
a neutron absorbing material received within the internal cavity; and a plurality of laterally spaced apart fuel containers received within the internal cavity, each fuel container having an internal volume adapted to receive unspent nuclear fuel, wherein the sum of the internal volumes of the fuel containers is at least 5% of the overall volume defined by the outer container.
an outer container bounding an interior and defining an overall volume;
a thermal insulation material disposed within the interior bounded by the outer container, the thermal insulation material bounding an internal cavity;
a neutron absorbing material received within the internal cavity; and a plurality of laterally spaced apart fuel containers received within the internal cavity, each fuel container having an internal volume adapted to receive unspent nuclear fuel, wherein the sum of the internal volumes of the fuel containers is at least 5% of the overall volume defined by the outer container.
2. A container according to claim 1 in which the internal cavity is divided up into a series of chambers, the chambers being defined by one or more elements, the elements spanning substantially the full height of the internal cavity and wherein the fuel containers are provided in more than three of the chambers.
3. A container according to claim 2 in which the internal cavity is divided into nine chambers, three chambers by three chambers, the fuel containers being provided in at least four of the chambers and the neutron absorbing material being provided in at least one of the chambers.
4. A container according to claim 2 in which the cavity is provided with nine sleeve elements, in a three by three sleeve element arrangement, to define nine chambers, the fuel containers being provided in at least four of the chambers, the neutron absorbing material being provided in at least one of the chambers.
5. A container according to claim 1 in which the internal cavity is provided with a correspondingly shaped single unit internal container comprising four side walls and a base.
6. A container according to claim 5 in which the internal container is divided up into a series of chambers.
7. A container according to claim 6 in which the internal container is divided by one or more elements crossing the internal cavity or container.
8. A container according to claim 6 in which the internal container is divided by one or more sleeves.
9. A container according to claim 8 in which the sleeves are encased in the neutron absorbing material.
10. A container according to claim 9 in which the neutron absorbing material comprises a resin-based material.
11. A container according to claim 10, wherein the resin is introduced around the sleeves as a liquid during manufacture.
12. A container according to claim 5 in which the internal container is made of steel.
13. A container according to claim 12 wherein the steel comprises at least one of boronated steel or stainless steel.
14. A container according to claim 1 in which the insulation material is provided in a series of discrete layers with one or more base layers.
15. A container according to claim 1 or 14 in which the insulation material is provided in a series of discrete layers with one or more wall layers for each wall.
16. A container according to claim 1 in which the insulation material is also neutron absorbing.
17. A container according to claim 1 in which the internal cavity is divided up into nine chambers or sleeves of substantially equivalent size.
18. A container according to claim 17 in which the fuel containers comprise cylindrical drums received in one or more of the chambers or sleeves.
19. A container according to claim 17 in which the fuel containers are provided in more than three of the chambers or sleeves.
20. A container according to claim 17 in which at least one of the chambers or sleeves is provided with the neutron absorbing material.
21. A method of transporting nuclear fuel comprising placing nuclear fuel in a container according to claim 1.
22. A method of storing nuclear fuel comprising placing nuclear fuel in a container according to claim 1.
23. A container according to claim 1 in which the sum of the internal volumes of the fuel containers is at least 10% of the overall volume defined by the outer container.
24. A container according to claim 1 in which the sum of the internal volumes of the fuel containers is at least 15% of the overall volume defined by the outer container.
25. A container according to claim 1 in which the sum of the internal volumes of the fuel containers is approximately 20%-40% of the overall volume defined by the outer container.
26. A container according to claim 1 further comprising a lid releasably attached to the outer container.
27. A container according to claim 26 in which the lid comprises thermal insulation material.
28. A container for transporting nuclear fuel, comprising:
an outer container defining a cavity therein;
a plurality of laterally spaced apart tubular sleeves disposed within the cavity, each of the plurality of sleeves being adapted to receive a nuclear fuel container containing unspent nuclear fuel;
a nuclear fuel container disposed within at least one of the plurality of laterally spaced apart tubular sleeves, the nuclear fuel container being adapted to receive unspent nuclear fuel;
a polymeric material disposed within the cavity so as to individually surround each of the plurality of sleeves within the cavity; and a neutron absorbing material disposed within the cavity.
an outer container defining a cavity therein;
a plurality of laterally spaced apart tubular sleeves disposed within the cavity, each of the plurality of sleeves being adapted to receive a nuclear fuel container containing unspent nuclear fuel;
a nuclear fuel container disposed within at least one of the plurality of laterally spaced apart tubular sleeves, the nuclear fuel container being adapted to receive unspent nuclear fuel;
a polymeric material disposed within the cavity so as to individually surround each of the plurality of sleeves within the cavity; and a neutron absorbing material disposed within the cavity.
29. A container according to claim 28 in which the polymeric material is a resin that is introduced into the cavity as a liquid during manufacture.
30. A container according to claim 28 in which the polymeric material is an insulating material.
31. A container according to claim 28 in which at least 50%
of the cavity is filled with the polymeric material.
of the cavity is filled with the polymeric material.
32. A container according to claim 28 further comprising a layer of an insulation material disposed between the polymeric material and the outer container, the insulation material having material properties different than the polymeric material.
33. A container according to claim 32 in which the insulation material comprises calcium silicate.
34. A container according to claim 32 in which the insulation material is provided in a series of discrete layers with one or more base layers.
35. A container according to claim 32 or 34 in which the insulation material is provided in a series of discrete layers with one or more wall layers for each wall.
36. A container according to claim 32, further comprising an inner container disposed within the cavity between the layer of insulation material and the polymeric material.
37. A container according to claim 32, in which the insulation material is neutron absorbing.
38. A container according to claim 28 in which the plurality of sleeves are ordered in a three by three array.
39. A transportable container for uranium oxide, comprising:
an outer container formed of steel bounding an interior and defining an overall volume;
a lid releasably fastenable to the outer container;
a thermal insulation material disposed within the interior bounded by the outer container, the thermal insulation material bounding an internal cavity;
four or more laterally spaced apart sleeves disposed within the internal cavity;
a neutron absorbing or moderating material at least partially surrounding each sleeve; and a fuel container received within each sleeve, the fuel container provided with a releasable lid and defining an internal volume adapted to receive unspent uranium oxide, the sum of the internal volumes of the fuel containers being at least 5% of the overall volume defined by the outer container.
an outer container formed of steel bounding an interior and defining an overall volume;
a lid releasably fastenable to the outer container;
a thermal insulation material disposed within the interior bounded by the outer container, the thermal insulation material bounding an internal cavity;
four or more laterally spaced apart sleeves disposed within the internal cavity;
a neutron absorbing or moderating material at least partially surrounding each sleeve; and a fuel container received within each sleeve, the fuel container provided with a releasable lid and defining an internal volume adapted to receive unspent uranium oxide, the sum of the internal volumes of the fuel containers being at least 5% of the overall volume defined by the outer container.
40. A container for transporting nuclear fuel, the container comprising:
an outer container defining an interior chamber therein;
a neutron absorbing material disposed within the interior chamber;
a plurality of laterally spaced apart sleeve members disposed within the interior chamber, each of the plurality of sleeve members being configured to receive therein a container of unspent nuclear fuel; and a nuclear fuel container comprising polyethylene received within at least one of the sleeve members, the nuclear fuel container adapted to contain unspent nuclear fuel.
an outer container defining an interior chamber therein;
a neutron absorbing material disposed within the interior chamber;
a plurality of laterally spaced apart sleeve members disposed within the interior chamber, each of the plurality of sleeve members being configured to receive therein a container of unspent nuclear fuel; and a nuclear fuel container comprising polyethylene received within at least one of the sleeve members, the nuclear fuel container adapted to contain unspent nuclear fuel.
41. A container according to claim 40 in which the polyethylene is a neutron absorber in a steel container corresponding to the size and shape of the sleeve into which the steel container is received.
42. A container according to claim 40 in which the polyethylene comprises at least one polyethylene bag.
43. A transportable container for nuclear fuel, comprising:
an outer container bounding an interior and defining an overall volume;
a thermal insulation material disposed within the interior bounded by the outer container, the thermal insulation material bounding an internal cavity; and four or more sleeves being provided within the cavity, one or more fuel containers being received within a sleeve, each of the fuel containers having a releasable lid, the sum of the internal volumes of the fuel containers being at least 5% of the overall volume defined by the outer container.
an outer container bounding an interior and defining an overall volume;
a thermal insulation material disposed within the interior bounded by the outer container, the thermal insulation material bounding an internal cavity; and four or more sleeves being provided within the cavity, one or more fuel containers being received within a sleeve, each of the fuel containers having a releasable lid, the sum of the internal volumes of the fuel containers being at least 5% of the overall volume defined by the outer container.
44. A container according to claim 43 in which the sleeves are surrounded by a neutron absorbing material, the neutron absorbing material filling the internal cavity apart from the inside of the sleeves.
45. A container according to claim 43 in which the non-sleeve volume of the internal cavity is filled by neutron absorbing material or neutron absorbing material which incorporates lower density materials.
46. A container according to claim 43 in which the sleeves are rigidly separated from one another.
47. A container according to claim 43 in which the outer container is of steel, the sleeves are of stainless steel, the sleeves are of circular cross-section, the internal diameter of the sleeves is substantially equivalent to the external diameter of the fuel containers, the sleeves are rigidly separated from one another, the sleeves are surrounded around their entire circumference by a neutron absorbing material, the fuel containers are of stainless steel, the fuel containers are cylindrical and the fuel is provided within the fuel containers in plastic bags.
48. A container according to claim 43 in which the outer container is provided with a lid.
49. A container according to claim 43 in which only one fuel container is provided in each sleeve.
50. A transportable container for nuclear fuel, comprising:
an outer container bounding an interior and defining an overall volume;
a thermal insulation material disposed within the interior bounded by the outer container, the thermal insulation material comprising one or more base layers and one or more wall layers; and a plurality of chambers being provided within bounds defined by the thermal insulation material, one or more fuel containers being provided within each of a plurality of the chambers, the sum of the internal volumes of the fuel containers being at least 5% of the overall volume defined by the outer container.
an outer container bounding an interior and defining an overall volume;
a thermal insulation material disposed within the interior bounded by the outer container, the thermal insulation material comprising one or more base layers and one or more wall layers; and a plurality of chambers being provided within bounds defined by the thermal insulation material, one or more fuel containers being provided within each of a plurality of the chambers, the sum of the internal volumes of the fuel containers being at least 5% of the overall volume defined by the outer container.
51. A container according to claim 50 in which the chambers are surrounded by a neutron absorbing material, the neutron absorbing material filling the bounds defined by the insulation apart from the inside of the chambers.
52. A container according to claim 50 in which neutron absorbing material or neutron absorbing material which incorporates lower density materials fills the non-sleeve volume.
53. A container according to claim 50 in which the internal bounds of the thermal insulation material contact a neutron absorbing material.
54. A container according to claim 50 in which the internal insulation is neutron absorbing.
55. A container according to claim 54 in which the interior bounds of the neutron absorbing insulation contact a neutron absorbing material.
56. A container according to claim 54 in which the neutron absorbing material is loaded with boron.
57. A container according to claim 50 in which the outer container is of steel, the chambers are defined by sleeves, the sleeves are of stainless steel, the sleeves are of circular cross-section, the internal diameter of the sleeves is substantially equivalent to the external diameter of the fuel containers, the sleeves are rigidly separated from one another, the sleeves are surrounded around their entire circumference by a neutron absorbing material, the fuel containers are of stainless steel, the fuel containers are cylindrical and the fuel is provided within the fuel containers in plastic bags.
58. A transportable container for nuclear fuel, the container comprising an outer container, the outer container being provided with a thermal insulation material disposed within it, a plurality of laterally spaced apart sleeves being provided within the outer container, one or more fuel containers being received within the one or more of the sleeves, the fuel containers each being provided with a releasable lid for the fuel container, the outer container being provided with a releasable lid for the outer container.
59. A container according to claim 58 in which the releasable lid for the fuel container seals the fuel container when fastened and the releasable lid for the outer container seals the outer container when fastened.
60. A container according to claim 58 in which the outer container and outer container lid provides a first barrier and the fuel container and fuel container lid provides a second barrier between the nuclear fuel and the exterior of the outer container.
61. A transportable container for nuclear fuel, the container comprising an outer container defined by outer container walls, the outer container being provided with a thermal insulation material disposed within it, a plurality of laterally spaced apart sleeves being provided within the outer container, the sleeves including one or more side walls, wherein there is provided between a side wall of a sleeve and an outer container wall of the outer container at least some of the thermal insulation material and a neutron absorbing material.
62. A container according to claim 61 in which a material of lower density than the neutron absorbing material is also provided between a side wall of a sleeve and an outer container wall.
63. A container according to claim 61 in which the neutron absorbing material is fire resistant.
64. A transportable container for nuclear fuel, in which:
the nuclear fuel is uranium oxide and the fuel is contained within a first container;
one or more first containers are contained within a fuel container;
each fuel container is received within a sleeve;
the sleeves are laterally spaced apart from one another within a cavity;
the cavity is provided with a thermal insulation material;
the thermal insulation material is disposed within an outer container; and the outer container contains both the fuel containers and the first containers.
the nuclear fuel is uranium oxide and the fuel is contained within a first container;
one or more first containers are contained within a fuel container;
each fuel container is received within a sleeve;
the sleeves are laterally spaced apart from one another within a cavity;
the cavity is provided with a thermal insulation material;
the thermal insulation material is disposed within an outer container; and the outer container contains both the fuel containers and the first containers.
65. A container according to claim 64 in which the first container is a plastic bag.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GBGB9609304.2A GB9609304D0 (en) | 1996-05-03 | 1996-05-03 | Improvements in and relating to fuel transportation |
| GB9609304.2 | 1996-05-03 | ||
| PCT/GB1997/001197 WO1997042636A1 (en) | 1996-05-03 | 1997-05-02 | Container for nuclear fuel transportation |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2251895A1 CA2251895A1 (en) | 1997-11-13 |
| CA2251895C true CA2251895C (en) | 2005-12-20 |
Family
ID=35645847
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002251895A Expired - Lifetime CA2251895C (en) | 1996-05-03 | 1997-05-02 | Container for nuclear fuel transportation |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2251895C (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113972022B (en) * | 2021-09-09 | 2023-10-31 | 清华大学 | Method and equipment for transporting nuclear fuel of nuclear power station |
-
1997
- 1997-05-02 CA CA002251895A patent/CA2251895C/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| CA2251895A1 (en) | 1997-11-13 |
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