Loading patent…
AssigneesKabushiki Kaisha Kobe Seiko Sho, Taisei Corporation
InventorsHiroaki Taniuchi, Jun Shimojo, Yutaka Sugihara, Eiji Owaki, Reiko Okamoto
Estimating the term…
The invention provides a composite from which concrete featuring a sufficiently high heat resistance can be produced, as well as a high-safety sealed concrete cask having no opening (shielding defect) to offer high shielding performance that can prevent corrosion of an internal canister and release of radioactive material to the exterior. A concrete cask of the invention includes a cask body having a bottom but no lid in itself, and a lid which can open and close off a top opening of the cask body. Both the cask body and the lid are made of concrete manufactured by using a composite including Portland cement or blended cement containing Portland cement, which is mixed with water in such a manner that the content of calcium hydroxide falls in a range of 15% to 60% by mass after hardening through hydration reaction. Metallic heat-transfer fins are embedded in the cask body.
A radiation shielding material comprising:
A concrete radiation shielding material comprising Portland cement, and at least one metallic material selected from the group consisting of iron, carbon steel and stainless steel in any of particulate, powder and fiber forms, and wherein the concrete radiation shielding material has a content of calcium hydroxide in a range of 15% to 60% by mass after hardening through hydration reaction, and the content of the at least one metallic material is in a range of 10% to 70% by mass after hardening through hydration reaction.
Dependencies are inferred from the claim text.