Cask and production method for cask
AssigneeMitsubishi Heavy Industries, Ltd.
InventorsKatsunari Ohsono, Toshihiro Matsuoka, Suguru Hode, Shinji Ookame
Life of this patent
Estimating the term…
Abstract
Heat conductive fins are welded along both sides of a belt-like member with a margin left along edges of the both sides, thereby to form a unit. The unit is welded to a body with the heat conductive fins from the outside of each fin. Next, another belt-like member is covered over a gap between adjacent belt-like members, and these members are welded from the outside. With this arrangement, there is no need to weld in a narrow and long space and the entire welding step is carried out from the outside, which makes it easier to assemble a cask.
Claims92
A cask comprising a body that accommodates a basket formed with a plurality of cells where spent fuel assemblies are accommodated, with a plurality of heat conductive fins provided around an external periphery of the body, an external cylinder fixed to an external periphery of the heat conductive fins, and a neutron absorber provided in a space formed with the heat conductive fins and the external cylinder, wherein
- the external cylinder has a structure that a plurality of belt-like members A and B are welded along edges of the members, the heat conductive fins are welded along both sides of one belt-like member A with a margin left along edges of the both sides, and another belt-like member B adjacent to the belt-like member A is welded near the respective edges.
A cask comprising a body that accommodates a basket formed with a plurality of cells where spent fuel assemblies are accommodated, with a plurality of heat conductive fins provided around an external periphery of the body, an external cylinder fixed to an external periphery of the heat conductive fins, and a neutron absorber provided in a space formed with the heat conductive fins and the external cylinder, wherein
- the external cylinder has a structure that belt-like members A and B are welded along edges of the members, a unit is structured by welding the heat conductive fins along both sides of one belt-like member A with a margin left along edges of the both sides, the unit is welded to the body with the heat conductive fins from the outside of the unit and is arranged at predetermined intervals, and another belt-like member B is covered over a gap between the belt-like member A and the belt-like member A of adjacent units and is welded from the outside.
A cask comprising a body that accommodates a basket formed with a plurality of cells where spent fuel assemblies are accommodated, with a plurality of heat conductive fins provided around an external periphery of the body, an external cylinder fixed to an external periphery of the heat conductive fins, and a neutron absorber provided in a space formed with the heat conductive fins and the external cylinder, wherein
- the external cylinder has a structure that belt-like members A and B are welded along edges of the members, a unit is structured by welding the heat conductive fin along an approximately central part of one belt-like member A, the unit is welded to the body with the heat conductive fins and is arranged at predetermined intervals, and another belt-like member B is covered over a gap between the belt-like member A and the belt-like member A of adjacent units and is welded from the outside of the member B.
A cask comprising a body that accommodates a basket formed with a plurality of cells where spent fuel assemblies are accommodated, with a plurality of heat conductive fins provided around an external periphery of the body, an external cylinder fixed to an external periphery of the heat conductive fins, and a neutron absorber provided in a space formed with the heat conductive fins and the external cylinder, wherein
- the external cylinder has a structure that a plurality of belt-like members A are welded along edges of the members, the heat conductive fin is welded along an approximately central part of the belt-like member A, the heat conductive fin is welded to the body from one side of the fin, and adjacent belt-like members A are welded near the edges of the members.
A cask comprising a body that accommodates a basket formed with a plurality of cells where spent fuel assemblies are accommodated, with a plurality of heat conductive fins provided around an external periphery of the body, an external cylinder fixed to an external periphery of the heat conductive fins, and a neutron absorber provided in a space formed with the heat conductive fins and the external cylinder, wherein
- the external cylinder has a structure that a belt-like member A having an angular shape or a valley shape in its cross section is covered over external edges of adjacent heat conductive fins, and contacting edges of adjacent belt-like members A are welded.
A cask comprising a body that accommodates a basket formed with a plurality of cells where spent fuel assemblies are accommodated, with a plurality of heat conductive fins provided around an external periphery of the body, an external cylinder fixed to an external periphery of the heat conductive fins, and a neutron absorber provided in a space formed with the heat conductive fins and the external cylinder, wherein
- the external cylinder has a structure that a plurality of ring sheets are welded in an axial direction of the cylinder, a unit is structured by welding a ring-shaped heat conductive fin along an approximately central part of an internal surface of the ring sheet, the unit is welded to the body with the heat conductive fin from one side of the fin, and contacting edges of adjacent ring sheets are welded from the outside of the ring sheet.
A cask comprising a body that accommodates a basket formed with a plurality of cells where spent fuel assemblies are accommodated, with a plurality of heat conductive fins provided around an external periphery of the body, an external cylinder fixed to an external periphery of the heat conductive fins, and a neutron absorber provided in a space formed with the heat conductive fins and the external cylinder, wherein
- the external cylinder has a structure that ring sheets A and B are welded in an axial direction of the cylinder, a unit is structured by welding ring-shaped heat conductive fins to both sides of one ring sheet A with a margin left along edges of the both sides, the unit is welded to the body with the heat conductive fins from the outside of the unit and is arranged at predetermined intervals, and another ring sheet B is disposed between the ring sheet A and the ring sheet A of adjacent units and is welded from the outside.
A cask comprising a heat conductive fin and an external cylinder that are divided into a plurality of units,
- each unit being connected around an external periphery of a body of the cask, and then
- adjacent external cylinders being connected together so as to enable heat conduction.
A cask comprising an external cylinder formed with a plurality of units that are disposed around an external periphery of a body of the cask,
- each of the units being integrally formed with a heat conductive fin and a wall of a part of the external cylinder in advance, and
- the heat conductive fins, the body, and adjacent walls of the external cylinder being connected together to enable heat conduction.
A cask comprising:
- a body having a cavity that accommodates fuel assemblies;
- a basket formed with sheet members that partition inside the cavity in a lattice shape;
- heat conductive plates provided on end surfaces of the sheet member that are in contact with the cavity;
- and
- a plurality of units each of which is integrally formed with a heat conductive f in connected to an external periphery of the body and an external cylinder covering over the external periphery of the body.
A method of manufacturing a cask, the method comprising:
- a step of forming a unit by welding the heat conductive fins along both sides of a belt-like member A with a margin left along edges of the both sides;
- a step of welding a plurality of the units to a body of the cask with the heat conductive fins from the outside of each of the units;
- and
- a step of fitting a belt-like member B into a gap between the belt-like member A and an adjacent belt-like member A, and welding along contacting edges of the belt-like members A and B from the outside.
A method of manufacturing a cask, the method comprising:
- a step of forming a unit by welding a heat conductive f in along an approximately central part of a belt-like member A;
- a step of welding at least two units to a body of the cask with the heat conductive fin by arranging the units at predetermined intervals;
- and
- a step of covering another belt-like member B over a gap between the belt-like member A and the belt-like member A of adjacent units and welding the belt-like member B from the outside.
A method of manufacturing a cask, the method comprising:
- a step of welding a heat conductive fin along an approximately central part of a belt-like member A;
- a step of welding the belt-like member A to a body of the cask with the heat conductive fin from an open side of the fin;
- and
- a step of welding a next belt-like member A to the body with a heat conductive fin from an open side of the fin, and welding adjacent belt-like members A together along contacting edges of the members A.
A method of manufacturing a cask, the method comprising:
- a step of forming a unit by welding a ring-shaped heat conductive fin along an approximately central part of the internal surface of a ring sheet A;
- a step of welding the unit to a body of the cask with the heat conductive fin in an axial direction of the cask from an open side of the fin;
- and
- a step of welding a next unit to the body with the heat conductive fin in the axial direction from an open side of the fin, and welding contacting edges of adjacent ring sheets A together from the outside.
A method of manufacturing a cask, the method comprising:
- a step of forming a unit by welding a ring-shaped heat conductive fin along an approximately central part of an internal surface of a ring sheet A;
- a step of welding the unit to a body of the cask with the heat conductive fin in an axial direction of the cask from an open side of the fin;
- a step of accommodating approximately a half of a molded resin formed in a ring shape into the unit;
- and
- a step of welding a next unit to the body with a heat conductive fin in the axial direction from an open side of the fin, welding contacting edges of adjacent ring sheets A together from the outside, and accommodating a remaining half of the formed molded resin in the unit.
A method of manufacturing a cask, the method comprising:
- a step of forming a unit by welding ring-shaped heat conductive fins along both sides of one ring sheet A with a margin left along edges of the both sides;
- a step of welding at least two units to the body with the heat conductive fins in an axial direction of the cask from the outside of the units by arranging the units at predetermined intervals;
- and
- a step of disposing another ring sheet B in a gap between the ring sheet A and the ring sheet A of adjacent units and welding the ring sheet B from the outside.
A method of manufacturing a cask, the method comprising:
- a step of forming a unit by welding ring-shaped heat conductive fins along both sides of one ring sheet A with a margin left along edges of the both sides;
- a step of accommodating a ring-shaped resin into the unit;
- a step of welding at least two units to a body of the cask with the heat conductive fins in an axial direction of the cask from the outside of the units by arranging the units at predetermined intervals;
- a step of disposing a resin molded in a ring-shape into between adjacent units;
- and
- a step of covering another ring sheet B over a gap between the ring sheet A and the ring sheet A of adjacent units and welding the ring sheet B from the outside.
A cask comprising a body internally provided with a basket that accommodates radioactive materials such as spent fuel assemblies, and a plurality of sheet members provided around the body, wherein
- a part of each of the members is in contact with the body, another part of the member constitutes an external surface of the cask and forms a single or plural angular-shaped portions or valley-shaped portions, and still another part of the member is connected to an adjacent sheet member, and
- a neutron absorber is filled in a space formed with the sheet members.
A cask comprising:
- a body internally provided with a basket that accommodates radioactive materials such as spent fuel assemblies;
- a plurality of sheet members provided around the body, with a part of each of the members being in contact with the body, another part of the member constituting an external surface of the cask, and still another part of the member being connected to an adjacent sheet member;
- and
- a heat good conductor that is adhered to the sheet member and has an extension section that reaches to contact the body.
A cask comprising:
- a body internally provided with a basket that accommodates radioactive materials such as spent fuel assemblies;
- and
- a plurality of sheet members provided around the body, with a part of each of the members being in contact with the body, another part of the member constituting an external surface of the cask, and still another part of the member being connected to an adjacent sheet member, the sheet member further including a fitting section with the body, and an intermediate member connected to the fitting section, wherein
- the fitting section has higher weldability with the body than other portions of the sheet member, and
- the intermediate member has higher thermal conductivity than other portions of the sheet member.
A cask comprising:
- a body internally provided with a basket that accommodates radioactive materials such as spent fuel assemblies;
- and
- a plurality of sheet members provided around the body, with a part of each of the members being in contact with the body, another part of the member constituting an external surface of the cask, and still another part of the member being connected to an adjacent sheet member, wherein
- the sheet member includes a portion that functions as a heat conductive fin and a portion that functions as an external cylinder, the portions being made of different materials from each other, and
- thermal conductivity of the portion that functions as the heat conductive fin is relatively high, and heat resistance of the portion that functions as the external cylinder is relatively high.
A cask comprising:
- a body internally provided with a basket that accommodates radioactive materials such as spent fuel assemblies;
- and
- a plurality of sheet members provided around the body, with a part of each of the members being in contact with the body, another part of the member constituting an external surface of the cask, and still another part of the member being connected to an adjacent sheet member, wherein
- the sheet member further includes a fitting section with the body, and
- the fitting section has higher weldability with respect to the body than other portions of the sheet member.
A cask comprising:
- a basket that is provided with cells where spent fuel assemblies are accommodated and has an approximately octagonal external shape,
- a body that accommodates the basket, has its external shape and internal shape formed to match the basket, and shields a gamma ray, and
- a neutron shield externally provided around the body.
(New) The cask according to claim 39, wherein the heat conductive fin is bent in an L shape or a U shape in its cross section, and is in surface contact with the belt-like member.
(New) The cask according to claim 39, wherein the adjacent belt-like members are coupled to each other along ends of the members.
(New) The cask according to claim 39, wherein for welding the heat conductive fins to the body made of steel, a bulge portion made of iron is provided on the body, and the heat conductive fin made of copper is welded to the bulge portion.
(New) A cask comprising a body that accommodates a basket formed with a plurality of cells where spent fuel assemblies are accommodated, with a plurality of heat conductive fins provided around an external periphery of the body, an external cylinder fixed to an external periphery of the heat conductive fins, and a neutron absorber provided in a space formed with the heat conductive fins and the external cylinder, wherein
- the external cylinder has a structure that first and second belt-like members are welded along edges of the members, a unit is structured by welding the heat conductive fins along both sides of one first belt-like member with a margin left along edges of the both sides, the unit is welded to the body with the heat conductive fins from the outside of the unit and is arranged at predetermined intervals, and a second belt-like member is covered over a gap between the first belt-like members of adjacent units and is welded from the outside.
(New) A cask comprising a body that accommodates a basket formed with a plurality of cells where spent fuel assemblies are accommodated, with a plurality of heat conductive fins provided around an external periphery of the body, an external cylinder fixed to an external periphery of the heat conductive fins, and a neutron absorber provided in a space formed with the heat conductive fins and the external cylinder, wherein
- the external cylinder has a structure that first and second belt-like members are welded along edges of the members, a unit is structured by welding the heat conductive fin along an approximately central part of one first belt-like member, the unit is welded to the body with the heat conductive fins and is arranged at predetermined intervals, and a second belt-like member is covered over a gap between the first belt-like members of adjacent units and is welded from the outside.
(New) A cask comprising a body that accommodates a basket formed with a plurality of cells where spent fuel assemblies are accommodated, with a plurality of heat conductive fins provided around an external periphery of the body, an external cylinder fixed to an external periphery of the heat conductive fins, and a neutron absorber provided in a space formed with the heat conductive fins and the external cylinder, wherein
- the external cylinder has a structure that a plurality of belt-like members A are welded along edges of the members, the heat conductive fin is welded along an approximately central part of the first belt-like member, the heat conductive fin is welded to the body from one side of the fin, and adjacent belt-like members A are welded near the edges of the members.
(New) A cask comprising a body that accommodates a basket formed with a plurality of cells where spent fuel assemblies are accommodated, with a plurality of heat conductive fins provided around an external periphery of the body, an external cylinder fixed to an external periphery of the heat conductive fins, and a neutron absorber provided in a space formed with the heat conductive fins and the external cylinder, wherein
- the external cylinder has a structure that a first belt-like member having an angular shape or a valley shape in its cross section is covered over external edges of adjacent heat conductive fins, and contacting edges of adjacent first belt-like members are welded.
(New) A cask comprising a body that accommodates a basket formed with a plurality of cells where spent fuel assemblies are accommodated, with a plurality of heat conductive fins provided around an external periphery of the body, an external cylinder fixed to an external periphery of the heat conductive fins, and a neutron absorber provided in a space formed with the heat conductive fins and the external cylinder, wherein
- the external cylinder has a structure that a plurality of ring sheets are welded in an axial direction of the cylinder, a unit is structured by welding a ring-shaped heat conductive fin along an approximately central part of an internal surface of the ring sheet, the unit is welded to the body with the heat conductive fin from one side of the fin, and contacting edges of adjacent ring sheets are welded from the outside of the ring sheet.
(New) A cask comprising a body that accommodates a basket formed with a plurality of cells where spent fuel assemblies are accommodated, with a plurality of heat conductive fins provided around an external periphery of the body, an external cylinder fixed to an external periphery of the heat conductive fins, and a neutron absorber provided in a space formed with the heat conductive fins and the external cylinder, wherein
- the external cylinder has a structure that first and second ring sheets are welded in an axial direction of the cylinder, a unit is structured by welding ring-shaped heat conductive fins to both sides of one first ring sheet with a margin left along edges of the both sides, the unit is welded to the body with the heat conductive fins from the outside of the unit and is arranged at predetermined intervals, and a second ring sheet is disposed between the first ring sheets of adjacent units and is welded from the outside.
(New) A cask comprising a heat conductive fin and an external cylinder that are divided into a plurality of units,
- each unit being connected around an external periphery of a body of the cask, and then
- adjacent external cylinders being connected together so as to enable heat conduction.
(New) A cask comprising an external cylinder formed with a plurality of units that are disposed around an external periphery of a body of the cask,
- each of the units being integrally formed with a heat conductive fin and a wall of a part of the external cylinder in advance, and
- the heat conductive fins, the body, and adjacent walls of the external cylinder being connected together to enable heat conduction.
(New) A cask comprising:
- a body having a cavity that accommodates fuel assemblies;
- a basket formed with sheet members that partition inside the cavity in a lattice shape;
- heat conductive plates provided on end surfaces of the sheet member that are in contact with the cavity;
- and
- a plurality of units each of which is integrally formed with a heat conductive fin connected to an external periphery of the body and an external cylinder covering over the external periphery of the body.
(New) A method of manufacturing a cask, the method comprising:
- a step of forming a unit by welding heat conductive fins along both sides of a first belt-like member with a margin left along edges of the both sides;
- a step of welding a plurality of the units to a body of the cask with the heat conductive fins from the outside of each of the units;
- and
- a step of fitting a second belt-like member into a gap between the first belt-like member and an adjacent first belt-like member, and welding along contacting edges of the first and second belt-like members from the outside.
(New) A method of manufacturing a cask, the method comprising:
- a step of forming a unit by welding a heat conductive fin along an approximately central part of a first belt-like member;
- a step of welding at least two units to a body of the cask with the heat conductive fin by arranging the units at predetermined intervals;
- and
- a step of covering a second belt-like member over a gap between the first belt-like members of adjacent units and welding the second belt-like member from the outside.
(New) A method of manufacturing a cask, the method comprising:
- a step of welding a heat conductive fin along an approximately central part of a first belt-like member;
- a step of welding the first belt-like member to a body of the cask with the heat conductive fin from an open side of the fin;
- and
- a step of welding a next first belt-like member to the body with a heat conductive fin from an open side of the fin, and welding adjacent belt-like members A together along contacting edges of the members A.
(New) A method of manufacturing a cask, the method comprising:
- a step of forming a unit by welding a ring-shaped heat conductive fin along an approximately central part of the internal surface of a first ring sheet;
- a step of welding the unit to a body of the cask with the heat conductive fin in an axial direction of the cask from an open side of the fin;
- and
- a step of welding a next unit to the body with the heat conductive fin in the axial direction from an open side of the fin, and welding contacting edges of adjacent first ring sheets together from the outside.
(New) A method of manufacturing a cask, the method comprising:
- a step of forming a unit by welding a ring-shaped heat conductive fin along an approximately central part of an internal surface of a first ring sheet;
- a step of welding the unit to a body of the cask with the heat conductive fin in an axial direction of the cask from an open side of the fin;
- a step of accommodating approximately a half of a molded resin formed in a ring shape into the unit;
- and
- a step of welding a next unit to the body with a heat conductive fin in the axial direction from an open side of the fin, welding contacting edges of adjacent ring sheets A together from the outside, and accommodating a remaining half of the formed molded resin in the unit.
(New) A method of manufacturing a cask, the method comprising:
- a step of forming a unit by welding ring-shaped heat conductive fins along both sides of one first ring sheet with a margin left along edges of the both sides;
- a step of welding at least two units to the body with the heat conductive fins in an axial direction of the cask from the outside of the units by arranging the units at predetermined intervals;
- and
- a step of disposing a second ring sheet in a gap between the first ring sheets of adjacent units and welding the second ring sheet from the outside.
(New) A method of manufacturing a cask, the method comprising:
- a step of forming a unit by welding ring-shaped heat conductive fins along both sides of one first ring sheet with a margin left along edges of the both sides;
- a step of accommodating a ring-shaped resin into the unit;
- a step of welding at least two units to a body of the cask with the heat conductive fins in an axial direction of the cask from the outside of the units by arranging the units at predetermined intervals;
- a step of disposing a resin molded in a ring-shape into between adjacent units;
- and
- a step of covering a second ring sheet over a gap between the first ring sheets of adjacent units and welding the second ring sheet from the outside.
(New) A cask comprising a body internally provided with a basket that accommodates radioactive materials such as spent fuel assemblies, and a plurality of sheet members provided around the body, wherein
- a part of each of the members is in contact with the body, another part of the member constitutes an external surface of the cask and forms a single or plural angular-shaped portions or valley-shaped portions, and still another part of the member is connected to an adjacent sheet member, and
- a neutron absorber is filled in a space formed with the sheet members.
(New) A cask comprising:
- a body internally provided with a basket that accommodates radioactive materials such as spent fuel assemblies;
- a plurality of sheet members provided around the body, with a part of each of the members being in contact with the body, another part of the member constituting an external surface of the cask, and still another part of the member being connected to an adjacent sheet member;
- and
- a heat good conductor that is adhered to the sheet member and has an extension section that reaches to contact the body.
(New) A cask comprising:
- a body internally provided with a basket that accommodates radioactive materials such as spent fuel assemblies;
- and
- a plurality of sheet members provided around the body, with a part of each of the members being in contact with the body, another part of the member constituting an external surface of the cask, and still another part of the member being connected to an adjacent sheet member, the sheet member further including a fitting section with the body, and an intermediate member connected to the fitting section, wherein
- the fitting section has higher weldability with the body than other portions of the sheet member, and
- the intermediate member has higher thermal conductivity than other portions of the sheet member.
(New) A cask comprising:
- a body internally provided with a basket that accommodates radioactive materials such as spent fuel assemblies;
- and
- a plurality of sheet members provided around the body, with a part of each of the members being in contact with the body, another part of the member constituting an external surface of the cask, and still another part of the member being connected to an adjacent sheet member, wherein
- the sheet member includes a portion that functions as a heat conductive fin and a portion that functions as an external cylinder, the portions being made of different materials from each other, and
- thermal conductivity of the portion that functions as the heat conductive fin is relatively high, and heat resistance of the portion that functions as the external cylinder is relatively high.
(New) A cask comprising:
- a body internally provided with a basket that accommodates radioactive materials such as spent fuel assemblies;
- and
- a plurality of sheet members provided around the body, with a part of each of the members being in contact with the body, another part of the member constituting an external surface of the cask, and still another part of the member being connected to an adjacent sheet member, wherein
- the sheet member further includes a fitting section with the body, and
- the fitting section has higher weldability with respect to the body than other portions of the sheet member.
Dependencies are inferred from the claim text.