Hitachi-ge Nuclear Energy, Ltd.

Ryuji Kimura

Yuji Matsui

Masashi Fukaya

Ren Morinaka

Fujio Yoshikubo

Hisamitu Hatou

Noboru Saito

A chamber having a water jet generation apparatus and a mesh installed inside is pushed against a surface of a peening object. A rotary vane of the water jet generation apparatus, disposed in a region in the chamber between the mesh and the chamber, is rotated to generate a water jet flowing toward the peening object in one region in the chamber, the one region is a region closer to the peening object than the mesh. A plurality of shotsput in the regionA moves toward the peening object along with the water jet and collides with the surface of the peening object. After the collision, the shots move toward the mesh along with the water jet. Compression residual stress is given to the surface of the peening object with which the shots have collided. Thus, spreading of contaminants peeled off from a peening object can be prevented.

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Hitachi, Japan

Ryuji Kimura