Abstract: A hydrogen production system that achieves a highly-efficient hydrogen production operation even when a time-varying electric power source is used is provided. A hydrogen production system includes a capacitor inputting electric power energy from a renewable power supply, and storing electric power, a pulse voltage generation unit generating a pulse voltage having a set amplitude and a set cyclic period by using the electric power stored in the capacitor, and an electrolytic cell applying the generated pulse voltage, and generating hydrogen by high temperature steam electrolysis by using steam supplied into the electrolytic cell.

Abstract: A hydrogen production system that achieves highly-efficient hydrogen production even when hydrogen is produced by using the plurality of cell stacks is provided. A hydrogen production system includes a plurality of cell stacks provided within a reaction containment, the cell stacks generating hydrogen by high temperature steam electrolysis by supplying steam to the plurality of cell stacks, a first flow path guiding the steam to each of the cell stacks, a second flow path causing a carrier gas containing air as a main component to flow into the reaction containment, and a flow regulation device provided at an inlet of the steam in each of the cell stacks, the flow regulation device regulating a flow rate of the steam caused to flow into each of the cell stacks to be uniform.

Abstract: A hydrogen production system that achieves highly-efficient hydrogen production even when hydrogen is produced by using the plurality of cell stacks is provided. A hydrogen production system includes a plurality of cell stacks provided within a reaction containment, the cell stacks generating hydrogen by high temperature steam electrolysis by supplying steam to the plurality of cell stacks, a first flow path guiding the steam to each of the cell stacks, a second flow path causing a carrier gas containing air as a main component to flow into the reaction containment, and a flow regulation device provided at an inlet of the steam in each of the cell stacks, the flow regulation device regulating a flow rate of the steam caused to flow into each of the cell stacks to be uniform.

Abstract: A hydrogen production system that achieves a highly-efficient hydrogen production operation even when a time-varying electric power source is used is provided. A hydrogen production system includes a capacitor inputting electric power energy from a renewable power supply, and storing electric power, a pulse voltage generation unit generating a pulse voltage having a set amplitude and a set cyclic period by using the electric power stored in the capacitor, and an electrolytic cell applying the generated pulse voltage, and generating hydrogen by high temperature steam electrolysis by using steam supplied into the electrolytic cell.

Abstract: An electromagnetic flow meter comprises: an excitation member (5) in which a plurality of magnets (5a, 5b, 5c) are arranged spaced apart from one another along an outer circumferential surface of a flow channel (1) through which liquid metal flows, and in which a magnetic field is formed in a direction perpendicular to the outer circumferential surface of the flow channel (1); and electrodes (6a, 6b) provided between the magnets (5a, 5b, 5c) of the excitation member (5), for measuring the voltage generated when the liquid metal crosses the magnetic field. A pulse excitation electric-current supply device (7a) for supplying a pulsed excitation current to the excitation member (5) is provided, whereby a flow speed distribution can be suppressed from being generated in the circumferential direction of the channel (1) even when the flow speed of the liquid metal is low, and the flow rate can be accurately measured.

Abstract: One embodiment of an electromagnetic flow rate measurement system includes electromagnetic flowmeters arranged at intervals from one another in the peripheral direction of an annular flow passage 1 in which an electric conductive fluid flows. Each of the electromagnetic flowmeters comprises: an excitation member that has magnets arranged at intervals from one another in the outer peripheral surface of the annular flow passage so as to form a magnetic field in the direction perpendicular to the outer peripheral surface of the annular flow passage; and electrodes that are provided between the magnets of the excitation member and between the magnets of the excitation member so as to measure voltage generated when the electric conductive fluid crosses the magnetic field. The polarities of the magnets at the end portions of the closest excitation members of the adjacent electromagnetic flowmeters are opposed to each other.

Abstract: An electromagnetic flow meter comprises: an excitation member (5) in which a plurality of magnets (5a, 5b, 5c) are arranged spaced apart from one another along an outer circumferential surface of a flow channel (1) through which liquid metal flows, and in which a magnetic field is formed in a direction perpendicular to the outer circumferential surface of the flow channel (1); and electrodes (6a, 6b) provided between the magnets (5a, 5b, 5c) of the excitation member (5), for measuring the voltage generated when the liquid metal crosses the magnetic field. A pulse excitation electric-current supply device (7a) for supplying a pulsed excitation current to the excitation member (5) is provided, whereby a flow speed distribution can be suppressed from being generated in the circumferential direction of the channel (1) even when the flow speed of the liquid metal is low, and the flow rate can be accurately measured.

Abstract: One embodiment of an electromagnetic flow rate measurement system includes electromagnetic flowmeters arranged at intervals from one another in the peripheral direction of an annular flow passage 1 in which an electric conductive fluid flows. Each of the electromagnetic flowmeters comprises: an excitation member that has magnets arranged at intervals from one another in the outer peripheral surface of the annular flow passage so as to form a magnetic field in the direction perpendicular to the outer peripheral surface of the annular flow passage; and electrodes that are provided between the magnets of the excitation member and between the magnets of the excitation member so as to measure voltage generated when the electric conductive fluid crosses the magnetic field. The polarities of the magnets at the end portions of the closest excitation members of the adjacent electromagnetic flowmeters are opposed to each other.

Abstract: A reflector system of a fast reactor according to the present invention comprises a reflector having a neutron reflecting portion reflecting a neutron radiated from a reactor core, and a cavity portion provided above the neutron reflecting portion and having a lower neutron reflecting capacity than a coolant, and a reflector drive apparatus coupled to the reflector and moving the reflector in a vertical direction. The reflector drive apparatus has a driving portion which is coupled to the reflector via a drive shaft, and drives the reflector up and down, and a load sensing portion which is provided between the driving portion and the drive shaft, and senses a load of the reflector. A detecting portion receiving a load signal from the load sensing portion so as to detect a breakage of the cavity portion of the reflector is connected to the load sensing portion.

Abstract: An acoustic-propagation-time measuring apparatus includes an acoustic transmitting and receiving section having an acoustic element capable of transmitting and receiving acoustic waves, an A/D converter which converts an echo signal reflected from a target object to be measured into a digital signal, an inverse-analysis section that converts the digital echo signal into an impulse signal through inverse analysis where the digital echo signal is multiplied by an inverse matrix, a calculating section that measures an acoustic propagation time and a time difference based on the digital echo signal converted to the impulse signal, and a display section which displays the acoustic propagation time and time difference calculated by the calculating section.

Abstract: An acoustic-propagation-time measuring apparatus includes an acoustic transmitting and receiving section having an acoustic element capable of transmitting and receiving acoustic waves, an A/D converter which converts an echo signal reflected from a target object to be measured into a digital signal, an inverse-analysis section that converts the digital echo signal into an impulse signal through inverse analysis where the digital echo signal is multiplied by an inverse matrix, a calculating section that measures an acoustic propagation time and a time difference based on the digital echo signal converted to the impulse signal, and a display section which displays the acoustic propagation time and time difference calculated by the calculating section.