Method of removing retainer of jet pump and jet pump
a technology of retainer and jet pump, which is applied in the direction of machines/engines, nuclear elements, greenhouse gas reduction, etc., can solve the problems of reducing the working efficiency of the rector, affecting the operation of the rector, and unable to achieve sufficient water shielding effect, so as to reduce the exposure of workers.
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first embodiment (fig.1)
First Embodiment (FIG. 1)
[0043] This embodiment mentions cut positions of a retainer 41 to be removed and a retainer mounting bolt 42 in a method of removing the jet pump retainer. The method includes the steps of cutting the retainer 41 or a retainer mounting bolt 42 for fastening the retainer through an underwater-remote control to remove the retainer mounting bolt 42 and removing the retainer through the underwater-remote control, the retainer 41 being disposed below a jet pump beam 23 of a jet pump 11 arranged in a reactor pressure vessel of a boiling water reactor to circulate cooling water to a reactor core.
[0044]FIG. 1 is a side view showing a cut position of the retainer 41 to be removed by the retainer removing method according to the embodiment and the retainer mounting bolt.
[0045] As shown in FIG. 1, the retainer 41 is positioned below the jet pump beam 23. The retainer 41 is fastened to the elbow 15 by the retainer mounting bolt 42. Bolt hexagonal side surfaces of the ...
second embodiment (
FIGS. 2 to 4)
[0050]FIG. 2 is a side view showing a cut position of the retainer 41 to be removed by the retainer removing method according to a second embodiment of the invention and the retainer mounting bolt 42.
[0051] As shown in FIG. 2, the retainer 41 is positioned below the jet pump beam 23. The retainer 41 is fastened to the elbow 15 by the retainer mounting bolt 42. Bolt hexagonal side surfaces of the retainer mounting bolt 42 are welded to a side surface of the retainer 41 so as to prevent the bolt 42 form loosening.
[0052]FIG. 2 shows, with hatching, a cut area (B) for cutting the retainer 41 around the retainer mounting bolt 42. As shown in FIG. 2, this second embodiment is different from the first embodiment in that the welded portion connecting the retainer mounting bolt 42 and the retainer 41 is not removed. By leaving the welded portion unremoved, a flange (flanged portion) is formed around the retainer mounting bolt 42 (in a state with a flange). At this time, a port...
third embodiment (fig.5)
Third Embodiment (FIG. 5)
[0059]FIG. 5 is a schematic view showing a bolt cutting device 31 for cutting the retainer 41 or the retainer mounting bolt 42 in the reactor pressure vessel 1.
[0060] As shown in FIG. 5, the bolt cutting device 31 includes a drive motor for laterally driving a processing (working) portion 63 and a drive motor for forward-backward driving a processing portion 62 provided to an upper plate 60, and a mounted processing portion 65 is movable longitudinally and laterally. Moreover, an upper plate vertical drive motor 64 is provided to a positioning plate 61 and the mounted positioning plate 61 is movable vertically.
[0061] The bolt cutting device 31 is disposed on the jet pump beams 23 by using the head bolts 28 screwed into the jet pump beams 23 disposed in the reactor as guide portions as shown in the drawing. After the disposition, the processing portion 65 of the bolt cutting device 31 is moved to a position of the retainer mounting bolt 42 to be subjected t...
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Abstract
Description
Claims
Application Information
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