Abstract: A device that enables storing in a vessel a fluid at high temperature, in which the fluid is under a coverage gas. The tank has a lower concave head and intermediate zone made by cylindrical rings generated by revolution bodies around the central vertical axis, which contains the level of high temperature fluid that is required to store, and an upper closure made up by an upper head with low altitude to diameter ratio to contain the coverage gas, and supported by the intermediate zone.

Abstract: A compact pressurized water nuclear reactor having connected to the reactor pressure vessel a plurality of horizontal pressure vessels, with all the horizontal pressure vessels connected to the reactor pressure vessel by a single connection between the respective nozzle of the reactor pressure vessel with the respective nozzle of each horizontal pressure vessel.

Abstract: This disclosure presents a new device for the removal and separation of isotopes of Helium in Compressed Natural Gas, based on a system with two cascades operating together to increase, in the first cascade, the concentration of Helium in the cascade head, and at the tail of the same cascade, Helium-depleted Compressed Natural Gas is discharged, while the second cascade, fed from the head of the first cascade, allows separation of the isotopes of Helium-3 and Helium-4, discharging Helium-3 through the head of the second cascade, while Helium-4 is discharged through the tail of the second cascade, with a configuration that is efficient from the energy consumption standpoint, while using a small number of rotating parts.