| 摘要 |
PROBLEM TO BE SOLVED: To surely measure reactor average temperature in piping connecting to outlet nozzles by arranging flow stabilization members in the core structure for almost all region of outside core region and between upper core support plates. SOLUTION: A perforation member 50 is provided on an upper core plate in the upper plenum corresponding to the core periphery in an open region S'-S' where no core support structure such as control rod cluster guide tube 22, upper core support column 23, etc., exists, that is, a location having no primary coolant flow of penetrating the upper core plate. The perforation member 50 is provided with almost all length between the upper core plate and the upper core support plate partitioning the upper plenum and desirably has nearly the same cross sectional area.
|
