摘要:
A filter (1, 1') for separating debris from a cooling liquid in a nuclear plant is described. The filter (1) comprises at least one passage (3) with an inner surface (5), an inlet end (2) and an outlet end (4), wherein the at least one passage (3) is arranged to permit through-flow of the cooling liquid in a main flow direction (MFD) from the inlet end (2) to the outlet end (4) for a cooling purpose in the nuclear plant. The inner surface (5) of the at least one passage (3) comprises at least one surface portion (7, 7') facing a sub flow direction (SFD) of the cooling liquid and comprising at least one surface irregularity (9, 9') arranged to catch the debris flowing in the cooling liquid in the sub flow direction (SFD), wherein the sub flow direction (SFD) is the opposite direction to the main flow direction (MFD). A fuel assembly (11, 11') for a nuclear plant, comprising a filter (1, 1') is also described.
摘要:
A method of making a nuclear fuel pellet for a nuclear power reactor. The method includes providing a nuclear fuel material in powder form, pressing the powder such that a so-called green pellet is obtained, providing a liquid that comprises an additive which is to be added to the green pellet, contacting the green pellet with the liquid such that the liquid, with the additive, penetrates into the pellet, and sintering the so treated green pellet, wherein the additive is such that larger grains in the nuclear fuel material are obtained with the additive.
摘要:
The present invention relates to a device for submersibly cleaning surfaces inside a nuclear reactor, comprising a pump (14), a nozzle (12) connected to said pump (14) and arranged to face surfaces to be cleaned, cleaning means capable of removing any debris on surfaces to be cleaned. The invention is characterised in that it further comprises adjustable flotation means (50), capable of adjusting the flotation capability of the device depending on cleaning application.
摘要:
A fuel assembly (3) for a nuclear boiling water reactor (1) is provided. The reactor comprises a plurality of such fuel assemblies and a plurality of control rods (4). Each control rod is insertable between the fuel assemblies. The fuel assembly has a longitudinal center axis (z) and includes a plurality of elongated fuel rods (7) and an elongated channel box (6). The channel box has inner sides (8), facing the fuel rods, and outer sides (9). Each inner and outer side has a longitudinal center line (y) extending in parallel with the center axis and along the length of the channel box. A number of protrusions (12) are distributed along the center line of at least two of the outer sides. The protrusions are configured to ensure a minimum distance (d2) between the outer side and an adjacent control rod and to enable the control rod to easily slide over and on top of the protrusions.
摘要:
A mechanical securing assembly (40) is adapted to secure the structural integrity of a flow passage formed by at least a first pipe part (41) and a second pipe part (42). The assembly comprises a connecting member (43), a first fastening member (44), attached to the connecting member and adapted to secure the connecting member to the first pipe part, and a second fastening member (45), attached to the connecting member and adapted to secure the connecting member to the second pipe part. The connecting member comprises a spring element (46) exerting a force pulling the first fastening member and the second fastening member towards each other along a primary axis (y), and thus being adapted to force the first pipe part and the second pipe part towards each other. The spring element is extendable along the primary axis by a compression of the spring element along a secondary axis forming an angle to the primary axis.