Radioactive-material container, metal gasket for sealing the radioactive-material container, and method of manufacturing the metal gasket
AssigneeMitsubishi Heavy Industries, Ltd.
InventorsKatsunari Ohsono, Takeshi Yokoyama, Kazuo Asada, Tadashi Kimura, Yasuhiro Sakaguchi, Shinji Ookame, Masaharu Minami
Life of this patent
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Abstract
A radioactive-material container includes a container body that shields nuclear radiation, which includes a cavity that stores a basket containing a recycle fuel assembly, a lid that covers the cavity, and a metal gasket that includes a sealing area that makes a physical contact with the container body and the lid. The sealing area has a specific shape that disperses tightening stress acting on the metal gasket for a sealing.
Claims36
A radioactive-material container comprising:
- a container body configured to shield nuclear radiation, the container body including a cavity configured to store a basket containing a recycle fuel assembly;
- a lid configured to cover the cavity;
- and
- a double-ring metal gasket including:
- a pair of coil springs made of a metal in circular shape, each coil spring having different hoop-diameters which are distances from a center of the container body;
- a pair of inner covers made of a metal configured to cover the coil springs in circular shape;
- a pair of outer covers made of a metal, which is softer than a material forming the container body and lid, configured to cover the inner covers in circular shape, the outer covers having areas configured to seal the nuclear radiation, wherein the areas make a physical contact with the container body and the lid, wherein
- the areas have a top and a bottom opposing one another, said top and bottom have flat surfaces, wherein said areas have no intentional projecting parts before being sealed and during being sealed between said container body and said lid, said areas are configured to disperse tightening stress acting on the metal gasket when sealed between said container body and said lid, wherein
- a ratio of a wire diameter d of the coil spring to a sectional diameter D of the metal gasket, d/D, is approximately equal to or more than 0.02 and equal to or less than 0.08, wherein
- d is approximately equal to or more than 0.35 millimeter and equal to or less than 0.8 millimeter, and
- D is approximately equal to or more than 5.0 millimeters and equal to or less than 12.0 millimeters.
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A radioactive-material container comprising:
- a container body that shields nuclear radiation, the container body including a cavity that stores a basket containing a recycle fuel assembly;
- a lid that covers the cavity;
- and
- a metal gasket that maintains a sealing inside the cavity, arranged between the container body and the lid, wherein
- the metal gasket includes
- at least one coil spring in circular shape;
- an inner cover that covers the at least one coil spring;
- and
- an outer cover that covers the inner cover.
A metal gasket comprising:
- a coil spring in circular shape;
- an inner cover that covers the coil spring;
- and
- an outer cover that covers the inner cover, wherein
- a hole for draining water is arranged in the inner cover.
A metal gasket comprising:
- a coil spring in circular shape;
- an inner cover that covers the coil spring;
- and
- an outer cover that covers the inner cover, wherein
- a portion of the inner cover on a side of smaller hoop-diameter is exposed along a hoop diameter of the outer cover, and
- the hole for draining water is arranged in the portion.
A metal gasket comprising:
- a first coil spring with a first hoop-diameter and a second coil spring with a second hoop-diameter in circular shape, the first hoop-diameter different from the second hoop-diameter;
- a first inner cover that covers the first coil spring and a second inner cover that covers the second coil spring;
- and
- an outer cover that covers the first inner cover and the second inner cover, linking the first coil spring and the second coil spring to form a double ring, wherein
- a portion of the inner cover on a side of smaller hoop-diameter is exposed along a hoop diameter of the outer cover, and
- the hole for draining water is arranged in the portion.
A metal gasket that maintains a sealing inside a cavity, arranged between a container body of a radioactive-material container and a lid that covers the cavity, comprising:
- a spring that is formed by forming a plate material to be circular and have substantially circular cross-section and overlapping ends of the plate material;
- and
- an outer cover that covers the spring, wherein
- a hole for draining water is arranged in the spring.
A method of manufacturing a metal gasket for sealing a radioactive-material container, comprising:
- making a hole for draining water in a plate material, the plate material;
- forming a coil spring in circular shape;
- forming an inner cover by winding the plate material around the coil spring;
- and
- winding an outer cover around the inner cover.
A method of manufacturing a metal gasket for sealing a radioactive-material container, comprising:
- making a hole for draining water in a plate material;
- forming a coil spring in circular shape;
- forming an inner cover by winding the plate material around the coil spring;
- and
- winding an outer cover around the inner cover in such a manner that the hole for draining water is exposed.
Dependencies are inferred from the claim text.