A nuclear reactor fuel bundle assembly including: a fuel bundle including an array of fuel rods and water rods mounted in an upper tie plate and housed in walls of a channel, and a pore type debris shield mounted at least partially in the channel, above or below the upper tie plate, the shield extending to or over the walls of the channel, whereby deflecting and/or capturing falling debris from entering the fuel assembly, wherein the shield is design to be durable, yet flexible, and porous.

A debris filter for a nuclear reactor installation is provided. The debris filter comprises a plurality of plates arranged side-by-side in a spaced relationship and delimiting between them flow passages extending through the debris filter from a lower inlet face to an upper outlet face of the debris filter, each passage having an intermediate section offset with respect to an inlet section and an outlet section. At least one of the plates is formed with debris catching features distributed along the plate and protruding into at least one passage delimited by the plate.

A filter for separating particles from a cooling liquid in a nuclear power plant includes a filter part arranged in a filter frame cooperating with a mounting part of a component of the nuclear power plant for mounting of the filter in the component. The filter frame includes a protruding part and/or a recess extending along an extension direction substantially perpendicular to a plane extending along a surface portion of an outer surface of the filter frame. The protruding part and/or the recess are arranged along the entire circumference of the filter frame along an outer edge of the filter frame. The protruding part and/or the recess are arranged to create an obstacle for the particles flowing between the filter frame and the mounting part. A filter arrangement and a fuel assembly are also described.

A nuclear reactor assembly may include a fuel rod and an end plug extending from the fuel rod The end plug may include a first engagement surface and a second engagement surface. The second engagement surface may have a circular groove disposed in an exterior surface of the end plug, the circular groove defining a plane orthogonal to a longitudinal axis of the end plug. The assembly may also include a bottom nozzle forming a recess, in which the recess includes a first retainer extending from the recess and a second retainer extending from the recess. The first retainer may engage the first engagement surface and the second retainer may include a second retainer portion to engage the second engagement surface. The first retainer and the second retainer may axially retain the end plug to the bottom nozzle.

The invention relates to a device for trapping debris in a fuel assembly of a nuclear reactor, which is mounted in the bottom nozzle of the fuel assembly. The device consists of two interconnected plate-type filter elements arranged one above the other and having channels for the passage of a coolant. In the lower filter element, the channels are inclined toward the axis of the fuel assembly, and in the upper filter element, the channels are parallel to the axis of the fuel assembly. The channels can be produced, in particular, by waterjet cutting to form slots in the field of a filter element plate, the slots being separated lengthwise by vertical ribs and widthwise by crosspieces. The vertical ribs and the crosspieces between the channels of each of the filter elements have roundings formed thereon, and a gap is provided between the vertical ribs and crosspieces formed in the plates of different filter elements. The technical result is the possibility of intercepting and trapping debris of any size contained in a coolant loop, without reducing the flow cross section for the coolant.

A debris filter configured for a nuclear fuel assembly bottom end part includes a lower nozzle (8) and the debris filter (18) is supported by the lower nozzle (8). The debris filter (18) has an inlet face (18A) and an outlet face (18B) opposed to the inlet face (18A), and comprises at least one filtering section (18D) that has a retention capacity that increases gradually or stepwise towards from the inlet face (18A) to the outlet face (18B).

A debris filter bottom nozzle for a nuclear reactor fuel assembly. The nozzle comprising venturi-shaped flow passages within a plate body. At least one flow passage has a filter therein, with the uppermost and lowermost ends of the filter being situated between the upper and lower ends of the flow passage. The plate body, the flow passages, and each filter are co-formed as a single piece unitary body. The co-forming may be via additive manufacturing.

The invention relates to a process for aiding the detection of migrating bodies within a fuel assembly of a nuclear power plant and more particularly on the anti-debris grid of the lower end piece of said assembly, during which at least one camera is controlled in the direction of said assembly and the stream of images recorded by said at least one camera is directed towards a man-machine interface which comprises at least one screen allowing a first operator to view said stream of video images, characterized in that it comprises a first step of detecting, using an image recognition algorithm, said migrating bodies, as well as at least a second step of alerting said operator if said algorithm has detected the potential presence of at least one migrating body.

A filter for separating debris from a cooling liquid in a nuclear plant includes a passage with an inner surface, an inlet end and an outlet end. The passage is configured to permit through-flow of the cooling liquid in a main flow direction from the inlet end to the outlet end for a cooling purpose. The inner surface of the passage includes at least one surface portion facing a sub flow direction of the cooling liquid and includes a surface irregularity configured to catch the debris flowing in the cooling liquid in the sub flow direction during lifting or transportation of the filter after the filter has been used for separating debris from the cooling liquid in the nuclear plant wherein the sub flow direction is the opposite direction to the main flow direction. A fuel assembly for a nuclear plant, comprising a filter is also described.