CHIMNEY OF NATURAL CIRCULATION TYPE BOILING WATER REACTOR, FUEL EXCHANGE METHOD OF NATURAL CIRCULATION TYPE BOILING WATER REACTOR USING THE SAME, INSPECTION METHOD OF NATURAL CIRCULATION TYPE BOILING WATER REACTOR USING THE SAME, AND NATURAL CIRCULATION TYPE BOILING WATER REACTOR USING THE SAME

摘要

PPROBLEM TO BE SOLVED: To improve structural stiffness of a cross-sectional periphery of a chimney and to facilitate mounting and dismounting, while maintaining a structure that enables removal of only a lattice part at the time of fuel exchange or inspection. PSOLUTION: The chimney structure of a natural circulation type boiling water reactor including a core loaded with a plurality of fuel assemblies forming a circular cross section and a chimney 11 located above the core has the following characteristics. The chimney includes: a chimney trunk 11d; and a plurality of lattice channels 11a and lattice channels partitioned by channel bulkheads 11b1 removable from the chimney structure and channel bulkheads 11b2 joined to the chimney trunk 11d, which are vertically disposed in the chimney trunk 11d; wherein all of the channel bulkheads 11b1 make angles and have a closed structure. PCOPYRIGHT: (C)2011,JPO&INPIT