| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a steam generator capable of preventing a second recirculation coolant from being mixed with a secondary coolant supplied from a supply channel even if there is no partition plate. <P>SOLUTION: This steam generator comprises a pipe group sheath arranged at predetermined intervals against the inner wall of the cylinder portion, a high temperature side heat transfer pipe group and a low temperature side pipe group each of which includes a plurality of inverted U-shaped heat transfer tubes, a tube plate that fixes the edges of a plurality of transfer tubes, a steam separator that separates the second recirculation coolant and steam, a water supply channel that supplies the secondary coolant into the pipe group sheath in a condition where the second recirculation coolant is isolated therefrom, a second recirculation coolant injection part located on the tube plate side of the pipe group sheath that injects the second recirculation coolant into the high temperature side heat transfer tube group, and a second water supply coolant injection part that injects the second water supply coolant supplied from the water supply channel into the low temperature side heat transfer tube group. The second recirculation coolant injection part and second water supply coolant injection part are regulated to maintain the relationship that the flow velocity of coolant with a relatively larger flow rate should be slower between the second recirculation coolant and second water supply coolant. <P>COPYRIGHT: (C)2013,JPO&INPIT |
