| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To make proper the passage pressure loss factor in an inlet orifice or the like disposed in a portion surrounded by a reinforcing beam and uniform the flow rate in fuel assemblies, thereby improving cooling capability. <P>SOLUTION: An inlet structure for coolant core includes: a core support plate 6; a reinforcing beam 7 supporting the core support plate 16 from a lower portion thereof; a plurality of control rod guide pipes 10 standing perpendicularly upward from a bottom side of a reactor pressure vessel and having upper end portions fitted respectively to fuel support holes formed to the core support plate 6; a fuel support member 16 inserted into upper end portions of the control rod guide pipes and supported by the core support plate 6 vertically in a core so as to support lower end portions of fuel assemblies 15 arranged in the core; an inlet orifice 19 formed to the fuel support member 16 so as to adjust the flow rate of a coolant flowing into the fuel assemblies 15; and vortex control means for controlling vortex of the coolant flowing into the inlet orifice 19 formed to the fuel support member 16, the vortex control means being provided at a portion on a coolant upstream side of the inlet orifice 19. <P>COPYRIGHT: (C)2008,JPO&INPIT</p> |
