Patent ID: 8608121

Claim:
A reactor metering pipe fixing device for fixedly holding a vertical metering pipe in a vertical direction on a cylindrical outer surface of a jet pump diffuser installed in a reactor pressure vessel of a boiling-water reactor, the reactor metering pipe fixing device comprising: an assembly for holding the metering pipe on the cylindrical outer surface of the jet pump diffuser, and a C-shaped holding member holding the assembly on the cylindrical outer surface from an outside, the assembly including: an outer holding member attached to the C-shaped holding member, and brought into contact with the metering pipe from an outer side of the metering pipe with respect to a radial direction; a plurality of inner holding members inside the outer holding member, movably attached to the outer holding member, and brought into contact with the metering pipe from an inner side of the metering pipe with respect to the radial direction; a plurality of wedges in a space between one of the plurality of inner holding members and the cylindrical outer surface of the jet pump diffuser for securing the plurality of inner holding members to the cylindrical outer surface, the plurality of wedges being in contact with the plurality of inner holding members and with the cylindrical outer surface; a first means that is vertically moving means for vertically moving the wedges along an axis of the metering pipe to widen the space between the one of the plurality of inner holding members and the cylindrical outer surface so as to secure the one of the plurality of inner holding members to the cylindrical outer surface of the jet pump diffuser; and a second means that is supporting means for supporting either the plurality of inner holding members or the wedges to be movable in the radial direction relative to the outer holding member, wherein the plurality of inner holding members, the wedges, the first means, and the second means are at an upper end and a lower end of the outer holding member, respectively, to fix two vertically spaced parts of the metering pipe to the cylindrical outer surface, wherein each of the plurality of wedges is disposed between one of the plurality of inner holding members and the cylindrical outer surface of the jet pump diffuser, and wherein a first wedge of the plurality of wedges does not contact a second wedge of the plurality of wedges.