| 摘要 |
PROBLEM TO BE SOLVED: To provide a natural circulation type boiling water reactor equipped with a chimney easily dismountable from a reactor pressure vessel, capable of reducing welded zones compared with the chimney of a conventional natural circulation type boiling water reactor. SOLUTION: In this natural circulation type boiling water reactor 1, a plurality of square tubes 11b constitute the chimney 11. Namely, each of the plurality of square tubes 11b partitions each passage of a coolant over the core. Therefore, in the chimney 11 of the natural circulation type boiling water reactor 1, welded zones can be reduced, because each edge of four corners is not required to be welded in each passage, differently from the case wherein a coolant passage is partitioned by a plate material welded integrally such as a grid-like passage bulkhead in the conventional natural circulation type boiling water reactor. COPYRIGHT: (C)2007,JPO&INPIT
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