| 摘要 |
PROBLEM TO BE SOLVED: To improve the structural integrity of a chimney without remarkably increasing component materials or manufacturing costs. SOLUTION: The chimney structure of a boiling water reactor of a natural circulation system which has a core loaded with fuel assemblies so that the cross section of the core is almost circular and with a chimney located above the core, is characterized in that the chimney is constituted by including a chimney trunk 11d, and a plurality of lattice channels 11a which are vertically placed inside the chimney trunk 11d, are partitioned by channel bulkheads 11b, and have rectangular cross sections, and that the lattice channels 11a include structures where some midpoint 102 in one side 101 of a cross-sectional rectangle 100 is supported by one side 201 of a cross-sectional rectangle 200 in an adjacent lattice flow channel 11a. COPYRIGHT: (C)2007,JPO&INPIT
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