Mitsubishi Power, Ltd.

Kimihiro Todo

Hideaki Sato

Shouhei Danno

Tomohiro Horai

Tatsuo Nakamoto

A set screw () is provided, which has a screw main body (), a male thread portion () which is formed on an outer periphery of the screw main body (), and a drain hole () which penetrates a central portion of the screw main body () in an extension direction of the screw main body (). The blade root ring () has a hole () which extends radially outward from an inner peripheral surface () of the blade root ring (), and a female thread portion () which is formed on an inner peripheral surface () of the hole (), and the set screw () is screwed into the female thread portion ().

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Yokohama, Japan

Kimihiro Todo