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Apparatus and method for reinforcing jet pump riser

  • US 8,718,222 B2
  • Filed: 08/16/2007
  • Issued: 05/06/2014
  • Est. Priority Date: 08/17/2006
  • Status: Active Grant
First Claim
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1. An apparatus for reinforcing a jet pump riser disposed in a reactor pressure vessel of a boiling water reactor, comprising:

  • an elbow upper clamp which is configured to cover an upper surface of a riser elbow of the jet pump riser and which riser elbow is coupled to a thermal sleeve from an upper side of the riser elbow, the elbow upper clamp includes a first portion which is configured to cover an upper surface of a first portion of the riser elbow, a central axis of the first portion of the riser elbow extending in a vertical direction, a second portion which is configured to cover an upper surface of a second portion of the riser elbow, a central axis of the second portion of the riser elbow extending in a horizontal direction, and a third portion which is configured to cover a curved upper surface of the riser elbow, the third portion is disposed between the first portion and the second portion;

    an elbow lower clamping member which is configured to cover a curved lower surface of the riser elbow from a lower side of the riser elbow;

    an elbow vertical portion clamping member which is configured to cover a lower surface of the first portion of the riser elbow; and

    an elbow horizontal portion clamping member which is configured to cover a lower surface of the second portion of the riser elbow,wherein a surface of the elbow upper clamp on a riser elbow side has a partially-circular arc shape substantially the same as the upper surface of the riser elbow,wherein the elbow lower clamping member cooperates with the third portion of the elbow upper clamp, the elbow vertical portion clamping member cooperates with the first portion of the elbow upper clamp, and the elbow horizontal portion clamping member cooperates with second portion of the elbow upper clamp so as to fix the thermal sleeve, the riser elbow and a riser pipe,andwherein the elbow lower clamping member is a substantially rectangular plate-shaped body with a circular recessed contact portion formed at a central portion of a cover surface of the plate-shaped body, a first end of the plate-shaped body of the elbow lower clamping member is pivotably connected to the elbow vertical portion clamping member and a second end of the plate-shaped body of the elbow lower clamping member is pivotably connected to the elbow horizontal portion clamping member so as to present a foldable structure.

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