Turbine with bucket fixing means

A turbine comprising:

• a rotor wheel comprising a plurality of dovetail grooves and an insertion groove, the plurality of dovetail grooves and the insertion groove arranged in a circumferential direction of the rotor wheel, the insertion groove comprising at least one first catching groove provided on an inner surface of the insertion groove;
• a plurality of first buckets, each of the plurality of first buckets comprising a first vane, a first platform provided at a first end portion of the first vane, and a dovetail provided at the first platform and having a shape corresponding to a shape of a corresponding dovetail groove of the plurality of dovetail grooves;
• a second bucket comprising a second vane, a second platform provided at a first end portion of the second vane, and a protrusion portion provided at the second platform and configured to be inserted into the insertion groove, the protrusion portion comprising at least one second catching groove;
• and
• a fixing member configured to be inserted into each of the at least one first catching groove and the at least one second catching groove, the fixing member configured to restrict radial movement of the second bucket.