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US 2025/0111956 A1Published application
Steam-water separator and boiling-water reactor
AssigneeHitachi-GE Nuclear Energy, Ltd.
InventorsKiyoshi FUJIMOTO, Kenichi KATONO
Life of this patent
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Abstract
Provided is a reactor that allows a fluid to easily flow. A reactor includes a reactor pressure vessel, a core provided in the reactor pressure vessel and loaded with a fuel assembly, and a steam-water separator provided in the reactor pressure vessel separates water and steam from a fluid containing the steam and the water generated in the core. The steam-water separator includes an annular flow channel through which the fluid flows from an upper side to a lower side and which opens to the lower side of the steam-water separator, and an opening that discharges air bubbles in the fluid flowing through the annular flow channel a side of the steam-water separator.
Claims9
A steam-water separator comprising:
- a standpipe configured to guide a fluid containing steam and water generated in a core from a lower side to an upper side;
- a diffuser connected to an upper side end of the standpipe and constitutes a flow channel, the diffuser having a flow channel cross-sectional area of the flow channel enlarged to be larger upward from the upper side end;
- an inner cylinder in a cylindrical shape communicating with an upper side end of the diffuser to constitute a flow channel;
- an outer cylinder in a cylindrical shape that constitutes an annular flow channel between the outer cylinder and the inner cylinder, and includes a discharge outlet at a lower end of the annular flow channel, the discharge outlet opening downward;
- a protruding portion provided so as to protrude to the annular flow channel, the protruding portion protruding from at least one of surfaces of the outer cylinder and the inner cylinder;
- an opening defined in the outer cylinder at least in a portion immediately below the protruding portion, the opening communicating the annular flow channel with outside of the outer cylinder and opening toward a side of the outer cylinder;
- an annular plate closing an upper side of the outer cylinder and constituting a circular hole whose diameter is smaller than a diameter of the inner cylinder;
- a pick-off ring extending downward in a cylindrical shape from an inner peripheral edge defining the circular hole of the annular plate, the pick-off ring making the circular hole constitute a flow channel to an upper part of the inner cylinder;
- and
- a swirler provided as an axial center of a flow channel through which the fluid flows in the standpipe.
7 more elements
The steam-water separator according to claim wherein
- the outer cylinder is disposed facing the inner cylinder and the diffuser, and
- the opening is provided above an upper end of the diffuser.
A boiling-water reactor comprising:
- a reactor pressure vessel;
- a core provided in the reactor pressure vessel and loaded with a fuel assembly;
- and
- a steam-water separator provided in the reactor pressure vessel, and separates liquid water and steam from a fluid containing the steam and the liquid water generated in the core, wherein
- the steam-water separator includes:
- a standpipe configured to guide the fluid generated in the core from a lower side to an upper side;
- a diffuser connected to an upper side end of the standpipe and constitutes a flow channel, the diffuser having a flow channel cross-sectional area of the flow channel enlarged to be larger upward from the upper side end;
- an inner cylinder in a cylindrical shape communicating with an upper side end of the diffuser to constitute a flow channel;
- an outer cylinder in a cylindrical shape that constitutes an annular flow channel between the outer cylinder and the inner cylinder, and includes a discharge outlet at a lower end of the annular flow channel, the discharge outlet opening downward;
- a protruding portion provided so as to protrude to the annular flow channel, the protruding portion protruding from at least one of surfaces of the outer cylinder and the inner cylinder;
- an opening defined in the outer cylinder at least in a portion immediately below the protruding portion, the opening communicating the annular flow channel with outside of the outer cylinder and opening toward a side of the outer cylinder;
- an annular plate closing an upper side of the outer cylinder and constituting a circular hole whose diameter is smaller than a diameter of the inner cylinder;
- a pick-off ring extending downward in a cylindrical shape from an inner peripheral edge defining the circular hole of the annular plate, the pick-off ring making the circular hole constitute a flow channel to an upper part of the inner cylinder;
- and
- a swirler provided as an axial center of a flow channel through which the fluid flows in the standpipe.
12 more elements
Dependencies are inferred from the claim text.