Stator blade segment and steam turbine

A stator blade segment comprising:

• a blade root ring which extends in a circumferential direction of an axis;
• a plurality of stator blades which are disposed on an inner peripheral surface of the blade root ring at intervals from each other in the circumferential direction and extend radially inward from the inner peripheral surface of the blade root ring;
• and
• a set screw 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,
• wherein the blade root ring has a hole which extends radially outward from the inner peripheral surface of the blade root ring, and a female thread portion which is formed on an inner peripheral surface of the hole,
• the set screw is screwed into the female thread portion,
• the blade root ring has a drain recessed portion which is formed on the inner peripheral surface of the blade root ring located between the stator blades adjacent to each other and collects drain condensate generated in steam,
• the hole extends radially outward from a bottom surface of the drain recessed portion, and
• an end surface of the screw main body located on the drain recessed portion side is disposed inside the hole.