JPWO2020237074A5

JPWO2020237074A5 -

Info

Publication number: JPWO2020237074A5
Application number: JP2021569228A
Authority: JP
Publication date: 2023-05-29

Claims

A filtration device for use in a bottom nozzle of a fuel assembly in a nuclear reactor comprising:
a top surface;
a bottom surface;
arranged in a first square grid pattern , extending between the bottom surface and the top surface, and between the bottom surface and the top surface via the filtering device a plurality of vertical walls defining a plurality of extending non-circular passages;
a plurality of first debris filters, each first debris filter positioned between the top surface and the bottom surface such that each first debris filter spans a respective one of the plurality of non-circular passages; , each first debris filter comprising a hollow pyramid structure or a hollow cone structure formed of a lattice structure comprising a plurality of first members intersecting a plurality of second members. A filtering device, comprising: a filter;

2. The filtering device of claim 1, wherein the lattice structure of each of the plurality of first debris filters defines a plurality of apertures .

The lattice structure of each of the plurality of first debris filters are arranged to form a second square grid pattern when viewed from directly above the filtering device or from directly below the filtering device. 3. The filtration device of claim 2, wherein:

4. The filtering device of claim 2 or 3 , wherein the at least one first debris filter narrows from the bottom of the at least one first debris filter to the top of the at least one first debris filter .

4. The filtering device of claim 2 or 3, wherein the at least one first debris filter narrows from the top of the at least one first debris filter to the bottom of the at least one first debris filter .

further comprising a plurality of second debris filters;
3. Each of said plurality of second debris filters is positioned between said top surface and said first debris filter so as to span a respective one of said plurality of non-circular passages. 1 filtration device.

the lattice structure of each of the plurality of first debris filters defining a plurality of first apertures ;
7. Each of the plurality of second debris filters comprises a hollow pyramid structure or a hollow cone structure formed of a grid structure, the grid structure defining a plurality of second apertures . Filtration device according to.

The grid structures of each of the plurality of first debris filters are arranged to form a second square grid pattern when viewed from directly above the filtering device or from directly below the filtering device. cage,
The lattice structure of each of the plurality of second debris filters are arranged to form a third square grid pattern when viewed from directly above the filtering device or from directly below the filtering device. 8. The filtration device of claim 7, wherein

9. The filtering device of claim 8, wherein the third square grid pattern is offset a distance from the second square grid pattern when viewed from above.

the at least one first debris filter narrows from the bottom of the at least one first debris filter to the top of the at least one first debris filter ;
10. The at least one second debris filter narrows from the bottom of the at least one second debris filter to the top of the at least one second debris filter. Filtration device as described.

the at least one first debris filter narrows from the top of the at least one first debris filter to the bottom of the at least one first debris filter;
10. The at least one second debris filter narrows from the top of the at least one second debris filter to the bottom of the at least one second debris filter. Filtration device as described.

A bottom nozzle assembly for use in a fuel assembly in a nuclear reactor comprising :
a rectangular skirt;
and a filtration device according to any one of claims 1 to 11 coupled to said rectangular skirt .