Container for storing and/or transporting spent nuclear fuel

Patent metadata

Field	Value
Publication number	US-10410756-B2
Application number	US-201715639332-A
Country	US
Kind code	B2
Filing date	Jun 30, 2017
Priority date	Jul 1, 2016
Publication date	Sep 10, 2019
Grant date	Sep 10, 2019

Abstract

A container for storing and/or transporting spent nuclear fuel. The container includes a body that defines an internal cavity that holds the spent nuclear fuel and an outer surface. The outer surface has holes formed therein into which trunnions are positioned. The container can be lifted by a lift yoke by coupling the lift yoke to the trunnions. The trunnions may include first and second components such that the first component is slidable in its axial direction relative to the second component when a force that exceeds a threshold acts on the second component. Thus, the second component may be slidable between a protruded state in which a portion of the second component protrudes from the outer surface of the body and a retracted state in which the second component does not protrude from the outer surface of the body.

First claim

What is claimed is:

1. A container for storing and/or transporting spent nuclear fuel comprising:
a body having an outer surface and an inner surface defining an internal cavity;
a plurality of blind holes formed into the body, each of the blind holes defined by a floor and a sidewall extending from the floor to an opening in the outer surface of the body;
a plurality of trunnions coupled to the body, each of the trunnions comprising:
a first component located within one of the blind holes, the first component extending from a first end to a second end and having an inner surface defining a hollow interior; and
a second component at least partially located within the hollow interior of the first component, the second component extending from a first end to a second end along a longitudinal axis; and

wherein for each of the plurality of trunnions, the second component is axially slidable relative to the first component between: (1) a protruded state in which a portion of the second component protrudes from the outer surface of the body; and (2) a retracted state in which the second component does not protrude from the outer surface of the body.

2. The container according to claim 1 wherein for each of the plurality of trunnions, the second component is welded to the first component to provide the second component of the trunnion with a limited axial load bearing capacity.

3. The container according to claim 1 wherein for each of the plurality of trunnions, an outer surface of the second component is in surface contact with the inner surface of the first component thereby forming an interface pressure between the first and second components to provide the second component of the trunnion with a limited axial load bearing capacity.

4. The container according to claim 1 wherein for each of the plurality of trunnions, the second component comprises a body portion and a flange portion extending radially from the body portion at the second end of the second component, the portion of the second component that protrudes from the outer surface of the body in the protruded state comprising the flange portion.

5. The container according to claim 4 wherein for each of the plurality of trunnions, the second end of the first component comprises a first portion that is flush with the outer surface of the body and a second portion that is recessed relative to the outer surface of the body thereby forming a nesting groove in the second end of the first component, and wherein when the second component is in the retracted state the flange portion of the second component nests within the nesting groove of the first component and is flush with the first portion of the second end of the first component and the outer surface of the body.

6. The container according to claim 1 wherein for each of the plurality of trunnions, the first end of the first component is in surface contact with the floor of the blind hole, an outer surface of the first component is in surface contact with the sidewall of the blind hole, and the second end of the first component is flush with the outer surface of the body.

7. The container according to claim 1 wherein the second component of each of the plurality of trunnions has an axial load bearing capacity and wherein the second component moves from the protruded state into the retracted state when an axial force greater than the axial load bearing capacity is applied to the second end of the second component in a direction towards the body.

8. The container according to claim 1 wherein for each of the plurality of trunnions, in the protruded state a first portion of the second component is located within the hollow interior of the first component and a second portion of the second component protrudes from the hollow interior of the first component, and wherein in the retracted state both of the first and second portions of the second component are located within the hollow interior of the first component.

9. The container according to claim 1 wherein for each of the plurality of trunnions, an entirety of the first component is located within the blind hole with the second end of the first component either flush with or recessed relative to the outer surface of the body when the second component is in both the protruded and retracted states.

10. The container according to claim 1 wherein for each of the plurality of trunnions, in the protruded state the first end of the second component is spaced apart from the floor of the blind hole by a gap and in the retracted state the first end of the second component moves into the gap.

11. The container according to claim 10 wherein axially sliding the second component from the protruded state to the retracted state comprises sliding the second component relative to the first component towards the body in a direction of the longitudinal axis of the second component.

12. The container according to claim 1 wherein in the protruded state, a portion of the second component that is located within the hollow interior of the first component has a length and a diameter, a ratio of the diameter to the length being between 1:1 and 2:1.

13. The container according to claim 1 wherein the second component has a length measured from the first end to the second end, and wherein when the second component is in the protruded state at least two-thirds of the length of the second component is located within the hollow interior of the first component.

14. The container according to claim 1 wherein in the retracted state the second end of the second component is flush with the outer surface of the body.

15. A container for storing and/or transporting spent nuclear fuel comprising:
a body having an outer surface and an inner surface defining an internal cavity configured to hold spent nuclear fuel;
a hole formed into the body, the hole defined by a floor and a sidewall extending from the floor to an opening in the outer surface of the body;
a trunnion at least partially located within the hole, the trunnion comprising:
a first component welded to the body within the hole, the first component having a first end that is in contact with the floor of the hole, a second end that is flush with or recessed relative to the outer surface of the body, an outer surface that is in contact with the sidewall of the hole, and an inner surface that defines a hollow interior; and
a second component located within the hollow interior of the first component, the second component extending from a first end to a second end along a longitudinal axis, the second component comprising a first portion that is located within the hollow interior of the first component and spaced from the floor of the hole by a gap and a second portion that protrudes from the outer surface of the body; and

wherein upon application of an axial force that exceeds a predetermined threshold onto the second end of the second component, the second component slides relative to the first component in an axial direction into the gap.

16. The container according to claim 15 wherein the second component is welded to the first component and wherein the axial force is sufficient to break the weld between the first and second components to permit the second component to slide relative to the first component.

17. The container according to claim 15 wherein an outer surface of the second component is in surface contact with the inner surface of the first component thereby creating an interface pressure between the first and second components that prevents the second component from sliding relative to t

Assignees

• Holtec International

Inventors

• Singh Krishna P

Classifications

• G21F5/14

  Devices for handling containers or shipping-casks, e.g. transporting devices {loading and unloading, filling of containers (cranes, load-engaging elements or devices for cranes, capstans, winches or tackles B66C)} · CPC title

• G21F5/06 Primary

  Details of, or accessories to, the containers · CPC title

• G21F5/008

  Containers for fuel elements · CPC title

• G21C19/32

  Apparatus for removing radioactive objects or materials from the reactor discharge area, e.g. to a storage place; Apparatus for handling radioactive objects or materials within a storage place or removing them therefrom (disposal of waste material G21F9/00) · CPC title

• Y02E30/30

  Nuclear fission reactors · CPC title