Hitachi-ge Nuclear Energy, Ltd.

Yasuhiro Mabuchi

Fumihito Hirokawa

Hiroaki Asakura

Sho Kuroita

Sadakatsu Sawahata

A chimney arranged inside of a reactor pressure vessel of a natural-circulation boiling water reactor is provided. The chimney includes plural flow channels which guide a steam-water two-phase flow generated in a reactor core to the upper part of the reactor pressure vessel. Each of the flow channels is formed by plural flow channel separation walls whose lower-most part is supported by a chimney lattice plate. Chimney spacers that support a horizontal load are arranged between the flow channel separation walls of the adjacent flow channels. Chimney support rings that support the horizontal load are arranged at the outermost periphery of the plural flow channels that are supported by the chimney lattice plate.

Growing community of inventors

Hitachi, Japan

Yasuhiro Mabuchi