SUPPORT PLATE FOR U-SHAPED HEAT TRANSFER TUBE OF STEAM GENERATOR OF NUCLEAR POWER PLANT AND STEAM GENERATOR THEREOF

The present invention discloses a support plate for U-shaped heat transfer tube of steam generator of nuclear power plant including a plate body. The plate body is provided with a number of three-leaf plum blossom-shaped holes extending through the plate body. A hole bridge is formed between two adjacent three-leaf plum blossom-shaped holes. Each three-leaf plum blossom-shaped holes includes a boss edge, a side edge and a top edge. After the U-shaped heat transfer tubes are inserted into the three-leaf plum blossom-shaped holes, the boss edge supports tube wall of the U-shaped heat transfer tube. The side edge and the top edge of the three-leaf plum blossom-shaped hole and the tube wall of the U-shaped heat transfer tube enclose a heat exchange fluid channel at outer side of the U-shaped heat transfer tube. A tube gallery area is formed at a middle portion of the plate body. The tube gallery area is provided with through holes and the three-leaf plum blossom-shaped holes are arranged on two sides of the tube gallery area, wherein and an included angle of connection line of the three-leaf plum blossom-shaped hole and side edge corresponding thereto is α, and 0