Water Jet Peening Apparatus and Water Jet Peening Method

Abstract

A water jet peening apparatus (WJP apparatus) includes a seating member, rotating portion set to it, and first and second injection nozzles. A hoisting apparatus is attached to the rotating portion, and the first and second injection nozzles are attached to a nozzle arm. The WJP apparatus is gone down in a reactor vessel (RV) by crane operation, and the seating member is seated on a bottom mounted instrumentation nozzle welded to a bottom head of the RV. By the hoisting apparatus, the nozzle arm is gone down and the first and second injection nozzles are gone down. The first injection nozzle is inserted into the bottom mounted instrumentation nozzle and the second injection nozzle is set outside the bottom mounted instrumentation nozzle. High-pressure water is jetted from the first and second injection nozzles, and WJP is implemented for both of the inner and outer surfaces of the welding area of the bottom mounted instrumentation nozzle.

What is claimed is: 
     
         1 . A water jet peening apparatus comprising:
 a seating member; rotating portion rotatably attached to said seating member and set above said seating member; a first hoisting apparatus installed on said rotating portion and having a first hoisting member going up and down; a first injection nozzle which is gone up and down by said first hoisting member and is inserted into a tubular member which is a water jet peening target when said seating member is seated on said tubular member; and a second injection nozzle which is attached to said first hoisting member and is set outside said tubular member when said seating member is seated on said tubular member.   
     
     
         2 . The water jet peening apparatus according to  claim 1 , wherein a through hole into which said first injection nozzle is inserted is formed on said seating member. 
     
     
         3 . The water jet peening apparatus according to  claim 1 , wherein a second hoisting apparatus having a second hoisting member going up and down is attached to said first hoisting member; and
 wherein said first injection nozzle is attached to said second hoisting member.   
     
     
         4 . The water jet peening apparatus according to  claim 1 , wherein said second injection nozzle is attached to said first hoisting member via a swing drive mechanism for swing in said second injection nozzle in an axial direction of the water jet peening apparatus. 
     
     
         5 . The water jet peening apparatus according to  claim 1 , comprising:
 a high-pressure pump; a first high-pressure hose connected to said first injection nozzle; a second high-pressure hose connected to said second injection nozzle; and a switching valve device for switching and connecting said first hose and said second hose to an outlet of said high-pressure pump.   
     
     
         6 . The water jet peening apparatus according to  claim 1 , comprising:
 a high-pressure pump; a first high-pressure hose connected to said first injection nozzle; a second high-pressure hose connected to said second injection nozzle; a first on-off valve installed on said first hose; and a second on-off valve installed on said second hose.   
     
     
         7 . A water jet peening method for implementing water jet peening on inner and outer surfaces of a welding area among a tubular member installed on a bottom of a reactor vessel and said reactor vessel by using a water jet peening apparatus having a seating member; rotating portion rotatably attached to said seating member and set above said seating member; a first hoisting apparatus installed on said rotating portion and having a first hoisting member going up and down; a first injection nozzle which is gone up and down by said first hoisting member and is inserted into said tubular member; and a second injection nozzle which is attached to said first hoisting member and is set outside said tubular member, comprising steps of:
 seating said seating member on said tubular member in said reactor vessel filled with water;   going down said first hoisting member;   inserting said first injection nozzle into said tubular member, and setting said second injection nozzle outside said tubular member;   jetting a water jet from said first injection nozzle and implementing water jet peening on said inner surface of said welding area, and   jetting a water jet from said second injection nozzle and implementing water jet peening for said outer surface of said welding area.   
     
     
         8 . The water jet peening method according to  claim 7 , comprising steps of:
 using said water jet peening apparatus wherein a second hoisting apparatus having a second hoisting member going up and down is attached to said first hoisting member; and said first injection nozzle is attached to said second hoisting member;   adjusting a distance between said first injection nozzle and said second injection nozzle in an axial direction of said reactor vessel by moving said second hoisting member in said axial direction by said second hoisting apparatus; and   jetting said jets from said first injection nozzle and said second injection nozzle with said adjusted distance to implement said water jet peening.   
     
     
         9 . The water jet peening method according to  claim 7 , comprising step of:
 jetting said jet from said second injection nozzle when said jet is jetted from said first injection nozzle.   
     
     
         10 . The water jet peening method according to  claim 7 , comprising steps of:
 holding a pole attached to an upper end portion of said water jet peening apparatus by using a rotation holding member of a pole holding apparatus attached to a hand rail of a platform set above said reactor vessel; and   rotating said rotation holding member and adjusting a direction of a injection outlet of said second injection nozzle.