Hitachi, Ltd.

Manabu Madokoro

Tadahiko Miyoshi

Shigeoki Nishimura

Tetsuo Oyama

Katsuhiko Shiota

Kiyoshi Otaka

Hisamitsu Hatoh

Haruo Sato

Takashi Jodoi

Hisaaki Ikeuchi

Sodium-sulphur battery system and driving method thereof

A highly reliable sodium-sulfur battery includes a cell container for the positive electrode which is hardly deteriorated by corrosion. The cell container for the positive electrode is assembled by integrating plural members made of a high corrosion resistant alloy containing Cr, or a Co base alloy containing Cr, Ni and Mo, wherein carbide containing at least one of Cr, W and Mo is precipitated, and a readily deformable portion is provided to the cell container for the positive electrode, whereby reliability of the sodium-sulfur battery can be significantly improved.

Sodium-sulfur battery, and a battery system using same

An electric power system effective for load leveling includes an electric power meter which measures the power that is charged from a generating facility into an electric power storing secondary battery via ac/dc converters, and also measures the discharged power that is supplied from the electric power storing secondary battery to a load via the ac/dc converters. A processing unit is provided which calculates a difference of an electric power fee from the quantity of charged power and quantity of discharged power measured by the electric power meter and respective unit prices of electric power, and then calculates the price for using the electric power storing secondary battery based on the electric power fee. The processing unit may be installed either on a manufacturer/lender's side or on an electric power consumer's side.

Electric power system using an electric power storing secondary battery effective for load leveling

A highly reliable sodium-sulfur battery includes a cell container for the positive electrode which is hardly deteriorated by corrosion. The cell container for the positive electrode is made of a Co base alloy containing Cr, Ni, and Mo, wherein carbide containing at least one of Cr, W, and Mo is precipitated, or the cell container for positive electrode is assembled by integrating plural members made of a high corrosion resistance alloy containing Cr by welding, and a readily deformable portion is provided to the cell container for positive electrode, whereby the reliability of the sodium-sulfur battery can be significantly improved.

The present invention provides an apparatus for handling core constituent elements of a reactor that comprises a core having as core constituent elements control rod assemblies each containing a control rod and fuel assemblies each containing nuclear fuel, a small rotating plug rotatably provided on the core, and a control rod drive mechanism provided on the small rotating plug, the control rod drive mechanism being characterized by comprising a plurality of grippers each having a hook projecting inwards so as to be able to engage with a handling head of the control rod and a hook projecting outwards so as to be able to engage with a handling head of each of the core constituent elements as a distance in the longitudinal direction; an operational head for opening and closing the grippers; and a third elevating drive mechanism for vertically driving the operational head; a second elevating frame for supporting the third elevating drive mechanism and the grippers; a second elevating drive mechanism for vertically driving the second elevating frame; a first elevating frame for supporting the second elevating drive mechanism and the second elevating frame; a first elevating drive mechanism for vertically driving the first elevating frame; and a frame which supports the first elevating drive mechansim and is provided on the small rotating plug.

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Hitachi, Japan

Manabu Madokoro