Filter and fuel assembly for a light-water nuclear reactor
AssigneeWestinghouse Atom AB
InventorOlov Nylund
Life of this patent
Estimating the term…
Abstract
A filter for separating particles from cooling water in a nuclear plant of light water model. The filter has an inlet end (2) and an outlet end (3) and allow flowing through of the cooling water in a flow direction % from the inlet end to the outlet end. The filter comprises a plurality of channels (5) extending mainly in the flow from the inlet end to the outlet end. Each of the channels comprise a first (6) channel section provided closer to the inlet end, a second (8) channel section arranged closer to the outlet end, and an intermediate section (7) provided between the first and the second channel section. The intermediate section (7) has an extension d2 in a direction x transversely to the flow direction, which is essentially larger than the extension d2.
Claims18
A filter (1) for separating particles from cooling water in a nuclear plant of light-water model, the filter having an inlet end (2) and an outlet end (3) and is adapted for permitting flowing-through of the cooling water in a main flow direction (z) from the inlet end to the outlet end, the filter comprising a plurality of channels (5) extending mainly in the flow direction (z) from the inlet end to the outlet end, each of the channels comprising a first (6) channel section provided closer to the inlet end, a second (8) channel section provided closer to the outlet end, and an intermediate (7) section provided between the first and the second channel section, characterised in that the intermediate (7) section has an extension (d2) in a direction (x) transversely to the flow direction which essentially is larger than the extension (d1, d3) of the first (6) and the second (8) channel section in said direction (x), and in that the filter comprises a separating member (9) arranged in the intermediate section, wherein the intermediate section and the separating member are arranged so that at least one bent passage (10, 11) for the cooling water is formed between the separating member and a wall of the intermediate section.
A filter according to any of the previous claims, characterised in that the walls of the intermediate section (7) are concave.
A filter according to any of the previous claims, characterised in that the centre line of the intermediate section (7) is essentially concentric to the centre line of the separating member (9).
A filter according to any of the previous claims, characterised in that the intermediate section (7) is essentially circular in a section parallel to the flow direction.
A filter according to any of the previous claims, characterised in that the channels (5) have an area of flow in the first section (6) which is essentially equal to the area of flow in the intermediate section (7).
A filter according to any of the previous claims, characterised in that two neighbouring channels (5) have intermediate sections (7) arranged at different distances from the inlet end (2).
A filter according to any of the previous claims, characterised in that it comprises a plurality of grooves (17) arranged on the surface of the inlet end and arranged essentially transversely to the longitudinal direction of the channels (5).
A fuel assembly (15, 16) for a nuclear plant of light-water model, the fuel assembly comprising a bottom part (21, 31), a top part (20, 30), and a plurality of fuel rods (22, 32) arranged next to each other with a interspace between them, the rods being arranged between the bottom part and the top part of the fuel assembly, the bottom part comprising a filter (1) for separating particles from cooling water being circulated through the fuel assembly, the filter having an inlet end (2) and an outlet end (3) and is adapted for permitting flowing-through of the cooling water in a main flow direction (z) from the inlet end to the outlet end, the filter comprising a plurality of channels (5) essentially extending in the flow direction from the inlet end to the outlet end, each of the channels comprising a first channel section (6) provided closer to the inlet end, a second channel section (8) provided closer to the outlet end, and an intermediate section (7) provided between the first and the second channel section, characterised in that in a direction (x) transversely to the flow direction, the intermediate section (7) has an extension (d2), which essentially is larger than the extension (d1,d3) of the first and the second channel section (6, 8) in said direction (x), and in that the filter comprises a separating member (9) arranged in the intermediate section (7), wherein the intermediate section and the separating member are arranged so that at least one bent passage (10, 11) for the cooling water is formed between the separating member and a wall of the intermediate section.
Dependencies are inferred from the claim text.