Abstract: A building unit constitutes part of a two or more story building. The building unit includes: a first unit that is pre-assembled somewhere other than at a building site and constitutes one of a plurality of floors; a second unit that is pre-assembled somewhere other than at the building site and constitutes a floor above the first unit out of the plurality of floors; and a space path (upper and lower floor air circulation duct that spatially communicates with the first unit and the second unit.

Abstract: Provided are a neutron detector for detecting a neutron flux distribution of the inside of a reactor, a drive cable connected to the neutron detector, a drive unit for driving the drive cable, a plurality of guide thimbles provided being inserted from the outside of the reactor into the reactor, for inserting the neutron detector, a storage tube for storing the neutron detector, a path transfer device connected to the drive unit, for selecting one of insertion of the neutron detector into each of the guide thimbles and insertion of the neutron detector into the storage tube, and an inspection guide tube connecting the drive unit and the storage tube. The drive unit has a switching unit for switching between the path transfer device side and the inspection guide tube side.

Abstract: A building unit constitutes part of a two or more story building. The building unit includes: a first unit that is pre-assembled somewhere other than at a building site and constitutes one of a plurality of floors; a second unit that is pre-assembled somewhere other than at the building site and constitutes a floor above the first unit out of the plurality of floors; and a space path (upper and lower floor air circulation duct that spatially communicates with the first unit and the second unit.

Abstract: A neutron detector detects a neutron flux distribution of the inside of a reactor. The neutron detector includes a thimble guide tube that is inserted inside of the reactor, for inserting the neutron detector. A drive apparatus is connected to the thimble guide tube for inserting or extracting the neutron detector into or out of the thimble guide tube. A vacuum unit controls the vacuum state in the thimble guide tube. A supply unit supplies carbon dioxide gas. A gas purge unit is connected to the supply unit and conducts gas purge in the thimble guide tube. A gate valve is provided between the thimble guide tube and the drive apparatus, and performs an open/close operation. A control apparatus controls the gate valve, the drive apparatus, the vacuum unit, the supply unit, and the gas purge unit.

Abstract: Provided are a neutron detector for detecting a neutron flux distribution of the inside of a reactor, a drive cable connected to the neutron detector, a drive unit for driving the drive cable, a plurality of guide thimbles provided being inserted from the outside of the reactor into the reactor, for inserting the neutron detector, a storage tube for storing the neutron detector, a path transfer device connected to the drive unit, for selecting one of insertion of the neutron detector into each of the guide thimbles and insertion of the neutron detector into the storage tube, and an inspection guide tube connecting the drive unit and the storage tube. The drive unit has a switching unit for switching between the path transfer device side and the inspection guide tube side.

Abstract: Provided are a neutron detector detecting a neutron flux distribution of the inside of a reactor, a thimble guide tube provided being inserted from outside into inside of the reactor, for inserting the neutron detector, a drive apparatus connected to the thimble guide tube and inserting or extracting the neutron detector into or out of the thimble guide tube, a vacuum unit controlling the vacuum state in the thimble guide tube, a supply unit supplying carbon dioxide gas, a gas purge unit connected to the supply unit and conducting gas purge in the thimble guide tube by carbon dioxide gas, a gate valve provided between the thimble guide tube and the drive apparatus and performing open/close operation, and a control apparatus controlling the gate valve, the drive apparatus, the vacuum unit, the supply unit, and the gas purge unit.

Abstract: The present invention provides a membrane structure for a liquid gas storage tank. The structure is characterized in that the bottom wall of the membrane comprises a number of elongated corrugated members arranged in a square-lattice pattern, and each member has a pair of spaced, parallel, longitudinally extending corrugations. Also, the members are assembled by joining one end of each corrugated member to substantially the mid-point of another corrugated member extending normal thereto, and each opening between the corrugated members is closed and made liquid tight by a thin plate.Preferably, each corrugated member is a sheet member of U-shaped cross-section, having a pair of vertical flanges of equal height, located between a pair of sheet members of L-shaped cross-section which are arranged back to back in spaced, parallel relationship, the top edges of respective adjacent vertical flanges of said L-shaped and said U-shaped members being continuously welded together.