Apparatus and method for reinforcing jet pump riser

• US 9,966,155 B2
• Filed: 03/11/2014
• Issued: 05/08/2018
• Est. Priority Date: 08/17/2006
• Status: Active Grant

• Current Assignee: Kabushiki Kaisha Toshiba (Toshiba Corporation)
• Original Assignee: Kabushiki Kaisha Toshiba (Toshiba Corporation)
• Inventors: Abura, Masakazu, Yasuda, Toshihiro, Sudo, Kazuo, Hata, Haruhiko, Kanazawa, Yasushi, Kinugasa, Kunihiko, Mori, Hajime
• Primary Examiner(s): Keith, Jack W
• Assistant Examiner(s): HERRICK, SANDRA L
• Application Number:
  US14/204,687
• Publication Number:
  US 20180090234A1
• Time in Patent Office: 1,519 Days
• Field of Search: 376372, 376353
• CPC Class Codes: G21C 15/25 using jet pumps
• CPC Class Codes: G21C 19/20 Arrangements for introducing objects into the pressure vessel; Arrangements for handling objects within the pressure vessel; Arrangements for removing objects from the pressure vessel
• CPC Class Codes: G21C 19/207 Assembling, maintenance or repair of reactor components G21C3/334 takes precedence
• CPC Class Codes: G21D 1/04 Pumping arrangements within the reactor pressure vessel G21C15/24; electrodynamic pumps H02K44/02
• CPC Class Codes: Y02E 30/30 Nuclear fission reactors
• CPC Class Codes: Y10T 403/5761 Interrupted periphery, e.g., split or segmental, etc.

Abstract

An apparatus for reinforcing a jet pump riser includes: an elbow upper clamp for covering a riser elbow coupled to a thermal sleeve from an upper side thereof; an elbow lower clamping member for clamping the riser elbow from a lower side thereof; an elbow vertical portion clamping member for covering a vertical portion of the riser elbow; and an elbow horizontal portion clamping member for covering a horizontal portion of the riser elbow. These members are disposed in different orientations with respect to the elbow upper clamp so as to fix the thermal sleeve, the riser elbow and the riser pipe.

Claims

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 for covering an upper surface of a riser elbow of a jet pump riser and the riser elbow is coupled to a thermal sleeve from an upper side of the riser elbow, the elbow upper clamp including a first portion which covers an upper surface of a first portion of the riser elbow, the first portion of the riser elbow having a central axis extending in a vertical direction, a second portion which covers an upper surface of a second portion of the riser elbow, the second portion of the riser elbow having a central axis extending in a horizontal direction, and a third portion which covers a curved upper surface of the riser elbow, the third portion of the elbow upper clamp being disposed between the first portion of the elbow upper clamp and the second portion of the elbow upper clamp;

an elbow vertical portion clamping member which covers a lower surface of the first portion of the riser elbow; and

an elbow horizontal portion clamping member which covers a lower surface of the second portion of the riser elbow,

wherein 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 the second portion of the elbow upper clamp so as to fix the thermal sleeve, the riser and

wherein the elbow vertical portion clamping member and the elbow horizontal portion clamping member are each formed as a U-shaped member, the elbow vertical portion clamping member and the elbow horizontal portion clamping member being separated from each other.

2. An apparatus for reinforcing a jet pump riser disposed in a reactor pressure vessel of a boiling water reactor, comprising:

an elbow upper clamp for covering an upper surface of a riser elbow of a jet pump riser and the riser elbow is coupled to a thermal sleeve from an upper side of the riser elbow, the elbow upper clamp including a first portion which covers an upper surface of a first portion of the riser elbow, the first portion of the riser elbow having a central axis extending in a vertical direction, a second portion which covers an upper surface of a second portion of the riser elbow, the second portion of the riser elbow having a central axis extending in a horizontal direction, and a third portion which covers a curved upper surface of the riser elbow, the third portion of the elbow upper clamp being disposed between the first portion of the elbow upper clamp and the second portion of the elbow upper clamp;

an elbow lower clamping member which covers a curved lower surface of the riser elbow from a lower side of the riser elbow;

an elbow vertical portion clamping member which covers a lower surface of the first portion of the riser elbow; and

an elbow horizontal portion clamping member which covers a lower surface of the second portion 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 connected to the first portion of the riser elbow relative to each other, and

wherein at least one of the elbow upper clamp, the elbow lower clamping member, the elbow vertical portion clamping member, and the elbow horizontal portion clamping member which cooperate with recessed portions provided on the lower surface of the riser elbow.

3. A method for reinforcing a jet pump riser:

disposing an apparatus for reinforcing the jet pump riser into a reactor pressure vessel of a boiling water reactor, the apparatus including;

an elbow upper clamp for covering an upper surface of a riser elbow of a jet pump riser and the riser elbow is coupled to a thermal sleeve from an upper side of the riser elbow, the elbow upper clamp including a first portion which covers an upper surface of a first portion of the riser elbow, the first portion of the riser elbow having a central axis extending in a vertical direction, a second portion which covers an upper surface of a second portion of the riser elbow, the second portion of the riser elbow having a central axis extending in a horizontal direction, and a third portion which covers a curved upper surface of the riser elbow, the third portion of the elbow upper clamp being disposed between the first portion of the elbow upper clamp and the second portion of the elbow upper clamp;

an elbow vertical portion clamping member which covers a lower surface of the first portion of the riser elbow; and

an elbow horizontal portion clamping member which covers a lower surface of the second portion of the riser elbow, wherein the elbow vertical portion clamping member and the elbow horizontal portion clamping member are each formed as a U-shaped member, the elbow vertical portion clamping member and the elbow horizontal portion clamping member being separated from each other; and

fixing a thermal sleeve, a riser elbow and a riser pipe connected to the first portion of the riser elbow relative to each other by cooperating the elbow vertical portion clamping member with the first portion of the elbow upper clamp, and cooperating the elbow horizontal portion clamping member with the second portion of the elbow upper clamp.