Novel Vertical Concrete Cask Design Used for Storing Nuclear Spent Fuel Dry Storage Canister

摘要

A concrete cask is used for storing a nuclear spent fuel dry storage canister. The cask has a shape of a vertical cylinder and is able to isolate the stored nuclear spent fuel dry storage canister from the ambient environment and shield the radiation from the stored nuclear spent fuels. An insulating ring is used for improving the dissipation and the transference uniformity of decay heat generated from the stored nuclear spent fuels. The insulating ring thus prevents the temperature of the concrete wall adjacent to the canister from exceeding specified limit. An Air inlet and an air outlet are used to generate a natural convection for moving out the decay heat. Therein, the vertical concrete cask is prevented from being overheated. Thus, the present invention improves the storage safety of a dry storage system.

主权项

1. A vertical concrete cask for storing a nuclear spent fuel dry storage canister of, comprising:
a lid; a steel liner, said steel liner comprising a cylindrical steel liner, an upper triangular rib and a rectangular rib; a concrete wall; an air outlet; an air inlet; an insulating ring; and a bottom weldment, wherein said upper triangular rib secures said insulating ring onto said steel liner; and guides a nuclear spent fuel dry storage canister into the vertical concrete cask; wherein said air inlet and air outlet faciliate a natural convection to move out decay heat generated by said nuclear spent fuels; and wherein said insulating ring is located on said steel liner to improve dissipation of said decay heat generated by said nuclear spent fuels and uniformly transfer said decay heat.