Hitachi, Ltd.

Other

Hitachi Engineering Co., Ltd.

Yuichi Uchiyama

Kenji Tominaga

Kumiaki Moriya

Tooru Takahashi

Tetsuo Horiuchi

Tsuyoshi Niino

Minoru Miki

Shouichirou Kinoshita

Kanehiro Ochiai

Minoru Akita

Takashi Nakayama

Masaki Matsumoto

Kenji Moriya

Kazuo Kage

Ryuji Kubota

Hideo Morishima

Toyoharu Yasuno

Akihiko Shiozawa

Tuyoshi Niino

A nuclear reactor facility including a primary containment vessel, a reactor pressure vessel installed in the primary containment vessel and accommodating a reactor core in a lower part thereof, and a vertical cylindrical wall disposed in a lower part of the primary containment vessel around and spaced from the reactor pressure vessel so as to delimit an annular space therebetween. The vertical cylindrical wall has an upper end disposed at a position higher than an upper end of the reactor core and a diaphragm extends substantially horizontally between the upper end of the vertical cylindrical wall and an inner wall of the primary containment vessel for cooperating with the vertical cylindrical wall to separate a space in the primary containment vessel around the reactor pressure vessel into a pressure suppression chamber and a drywell which includes annular space. The pressure suppression chamber accommodates therein a pool of liquid coolant wherein a level of the liquid coolant of the pool is higher than the upper end of the reactor core. The vertical cylindrical wall has a plurality of vent passages having an upper part at the upper end of the vertical cylindrical wall and exposed to the drywell and a lower part exposed to the pool of the liquid coolant in the pressure suppression chamber. A submergence line and a channel member are also provided.

Nuclear power facilities

A container-outer-periphery pool in which water is stored is provided between a primary containment vessel and a reactor building, and outside of a pressure suppression pool. Consequently, the natural heat transfer capabilities of reactor facilities is enhanced, and the inherent safety of the reactor facilities is improved.

A nuclear reactor containment structure including a diaphragm floor for dividing a closure casing into a drywell and a pressure suppression chamber, the diaphragm floor being supported at its inner peripheral end by a pedestal for a pressure vessel and abutting at its outer peripheral end against shear keys secured to the closure casing. The diaphragm floor includes a concrete layer embedded between structural steels extending radially between the pedestal and the shear keys.

Nuclear reactor containment structure

Growing community of inventors

Hitachi, Japan

Yuichi Uchiyama