Nuclear reactor shroud
First Claim
1. A shroud segment for a nuclear reactor vessel, the shroud segment comprising:
- an elongated inner shell;
an elongated outer shell;
a plurality of elongated intermediate shells disposed between the inner and outer shells;
the inner shell, outer shell, and intermediate shells being radially spaced apart forming a plurality of annular cavities for holding water;
a top closure plate attached to the top of the shroud segment; and
a bottom closure plate attached to the bottom of the shroud segment;
wherein the top and bottom closure plates are configured for detachable coupling to adjoining shroud segments to form a stacked array of shroud segments;
a mounting clamp pivotably attached to the bottom closure plate, the mounting clamp movable between an open unlocked position and a closed locked position; and
an elastically deformable and arcuately shaped seismic restraint fixedly attached to the shroud segment;
wherein the seismic restraint is a leaf spring fixedly attached to the clamp and pivotable with the clamp.
3 Assignments
0 Petitions
Accused Products
Abstract
A nuclear reactor in one embodiment includes a cylindrical body having an internal cavity, a nuclear fuel core, and a shroud disposed in the cavity. The shroud comprises an inner shell, an outer shell, and a plurality of intermediate shells disposed between the inner and outer shells. Pluralities of annular cavities are formed between the inner and outer shells which are filled with primary coolant such as demineralized water. The coolant-filled annular cavities may be sealed at the top and bottom and provide an insulating effect to the shroud. In one embodiment, the shroud may comprise a plurality of vertically-stacked self-supported shroud segments which are coupled together.
16 Citations
16 Claims
-
1. A shroud segment for a nuclear reactor vessel, the shroud segment comprising:
-
an elongated inner shell; an elongated outer shell; a plurality of elongated intermediate shells disposed between the inner and outer shells; the inner shell, outer shell, and intermediate shells being radially spaced apart forming a plurality of annular cavities for holding water; a top closure plate attached to the top of the shroud segment; and a bottom closure plate attached to the bottom of the shroud segment; wherein the top and bottom closure plates are configured for detachable coupling to adjoining shroud segments to form a stacked array of shroud segments; a mounting clamp pivotably attached to the bottom closure plate, the mounting clamp movable between an open unlocked position and a closed locked position; and an elastically deformable and arcuately shaped seismic restraint fixedly attached to the shroud segment; wherein the seismic restraint is a leaf spring fixedly attached to the clamp and pivotable with the clamp. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 11, 12, 13)
-
-
10. A shroud segment for a nuclear reactor vessel, the shroud segment comprising:
-
an elongated inner shell; an elongated outer shell; a plurality of elongated intermediate shells disposed between the inner and outer shells; the inner shell, outer shell, and intermediate shells being radially spaced apart forming a plurality of annular cavities for holding water; a top closure plate attached to the top of the shroud segment; a bottom closure plate attached to the bottom of the shroud segment; wherein the top and bottom closure plates are configured for detachable coupling to adjoining shroud segments to form a stacked array of shroud segments; a mounting clamp pivotably attached to the bottom closure plate, the mounting clamp movable between an open unlocked position and a closed locked position; and an elastically deformable and arcuately shaped seismic restraint fixedly attached to the shroud segment; wherein the seismic restraint defines an outward facing concave recess, the seismic restraint configured to engage an interior of the reactor vessel when the shroud segment is mounted therein.
-
-
14. A shroud segment for a nuclear reactor vessel, the shroud segment comprising:
-
an elongated inner shell; an elongated outer shell; a plurality of elongated intermediate shells disposed between the inner and outer shells; the inner shell, outer shell, and intermediate shells being radially spaced apart forming a plurality of annular cavities between the inner shell, outer shell, and intermediate shells configured for holding water; a top closure plate attached to the top of the shroud segment; and a bottom closure plate attached to the bottom of the shroud segment; wherein the annular cavities are fluidly interconnected by a plurality of drain holes formed through the outer shell and intermediate shells, the drain holes in the outer shell spaced longitudinally apart along a length of the outer shell, and the drain holes in the intermediate shells being spaced longitudinally apart along a respective length of each intermediate shell; the top and bottom closure plates configured for detachable coupling to adjoining shroud segments to form a stacked array of shroud segments; a mounting clamp configured to detachably couple to a top closure plate of an adjoining shroud segment; the mounting clamp pivotably coupled to the bottom closure plate via a pivot pin extending through the bottom closure plate and defining a stationary pivot axis, the mounting clamp movable about the pivot axis between an open unlocked position and a closed locked position; and a locking fastener rotatably mounted to the bottom closure plate and operable to retain the mounting claim in the closed locked position. - View Dependent Claims (15)
-
-
16. A shroud segment for a nuclear reactor vessel, the shroud segment comprising:
-
an elongated inner shell; an elongated outer shell; a plurality of radially spaced apart elongated intermediate shells disposed between the inner and outer shells; a top closure plate attached to the top of the shroud segment and having an outer circumferentially-extending peripheral edge which is substantially flush in radial direction with the outer shell; a bottom closure plate attached to the bottom of the shroud segment and having an outer circumferentially-extending peripheral edge which is substantially flush in radial direction with the outer shell; wherein the top and bottom closure plates each comprise a plurality of mounting tabs protruding radially outwards beyond their respective peripheral edges, the mounting tabs being configured for coupling to mounting tabs of adjoining shroud segments to form a stacked array of shroud segments; an outer annular cavity formed between the intermediate shells and the outer shell; an inner annular cavity formed between the intermediate shells and the inner shell; a plurality of intermediate annular cavities formed between the intermediate shells; and a mounting clamp pivotably attached to each of the mounting tabs of the bottom closure plate, the mounting clamps movable between an open unlocked position and a closed locked position; wherein the inner, outer, and intermediate shells of each shroud segment is seal welded to their respective top and bottom closure plates collectively forming a self-supporting shroud segment structure, each shroud segment detachably coupled to an adjoining shroud segment.
-
Specification