The present invention provides systems, methods and devices for storing and/or disposing of hazardous waste material such as calcined material. In certain embodiments, the system comprises a filling nozzle having a valve body having a distal end and an outer surface, the outer surface proximate the distal end being configured to sealingly and removeably couple to an inner surface of a filling port of the container. In certain embodiments, the method comprises (a) coupling an outer surface of a filling nozzle with an inner surface of a filling port of a container to form a first seal (b) adding hazardous waste material into the container (c) decoupling the filling port from the filling nozzle and (d) inserting a fill plug into the filling port, the fill plug forming a second seal with the inner surface of the filling port, the second seal being distally spaced from at least a portion of the first seal with respect to the container.

A concrete cask enabling suppression of occurrence of stress corrosion cracking (SCC) in a lid welded part of a canister. The concrete cask includes: a metal canister accommodating spent fuel; a concrete container body for accommodating the canister inside the container body; a cooling passage provided between the external peripheral surface of the canister and the internal peripheral surface of the container body, and allowing air for cooling the external peripheral surface of the canister to pass; and a top space provided between the top surface part of the canister, and the inside of a lid of the container body. A baffle plate for suppressing introduction of air rising through the cooling passage to the top space is provided.

A concrete cask enabling suppression of occurrence of stress corrosion cracking (SCC) in a lid welded part of a canister. The concrete cask includes: a metal canister accommodating spent fuel; a concrete container body for accommodating the canister inside the container body; a cooling passage provided between the external peripheral surface of the canister and the internal peripheral surface of the container body, and allowing air for cooling the external peripheral surface of the canister to pass; and a top space provided between the top surface part of the canister, and the inside of a lid of the container body. A baffle plate for suppressing introduction of air rising through the cooling passage to the top space is provided.

A device for storing dangerous materials includes a mount supporting a containment enclosure for containing dangerous materials. The mount includes a frame surmounted by support members that support the enclosure, each support member including a first element secured to the mount and a second element for supporting the enclosure and that is mounted so as to be movable relative to the first element in a substantially vertical sliding direction. The mount includes at least one impact absorber interposed between the two elements, the at least one impact absorber preventing relative movement between the two elements so long as a force applied to the at least one impact absorber by the two elements is no greater than a predetermined threshold. The at least one impact absorber deforms plastically so as to allow the two elements to move relative to each other.

A device for storing dangerous materials includes a mount supporting a containment enclosure for containing dangerous materials. The mount includes a frame surmounted by support members that support the enclosure, each support member including a first element secured to the mount and a second element for supporting the enclosure and that is mounted so as to be movable relative to the first element in a substantially vertical sliding direction. The mount includes at least one impact absorber interposed between the two elements, the at least one impact absorber preventing relative movement between the two elements so long as a force applied to the at least one impact absorber by the two elements is no greater than a predetermined threshold. The at least one impact absorber deforms plastically so as to allow the two elements to move relative to each other.

A migration prevention system for radioactive wastewater from an underground nuclear power plant. The underground nuclear power plant includes a nuclear island including an underground cavern group including a reactor cavity and auxiliary cavities. The migration prevention system includes a protective layer coating the reactor cavity and an impermeable layer surrounding the nuclear island. The protective layer includes an inner liner, a drainage layer, and a filling layer of rock fractures in that order. The inner liner is configured to prevent exosmosis of the radioactive wastewater of the reactor cavity. The drainage layer is configured to gather and drain seepage water. The impermeable layer is disposed in the periphery of the underground cavern group including the reactor cavity and the auxiliary cavities, and is configured to isolate the underground cavern group from natural underground water.

A migration prevention system for radioactive wastewater from an underground nuclear power plant. The underground nuclear power plant includes a nuclear island including an underground cavern group including a reactor cavity and auxiliary cavities. The migration prevention system includes a protective layer coating the reactor cavity and an impermeable layer surrounding the nuclear island. The protective layer includes an inner liner, a drainage layer, and a filling layer of rock fractures in that order. The inner liner is configured to prevent exosmosis of the radioactive wastewater of the reactor cavity. The drainage layer is configured to gather and drain seepage water. The impermeable layer is disposed in the periphery of the underground cavern group including the reactor cavity and the auxiliary cavities, and is configured to isolate the underground cavern group from natural underground water.

A tool for cleaning a pool, particularly in a radioactive environment. The tool comprises a liquid filtering device, a pump, and a tank. The tank comprises an inlet for liquid from the pool. The tank at least partly houses the filtering device and the pump. The filtering device is arranged between the inlet and the pump so as to fluidically connect said inlet and pump

A tool for cleaning a pool, particularly in a radioactive environment. The tool comprises a liquid filtering device, a pump, and a tank. The tank comprises an inlet for liquid from the pool. The tank at least partly houses the filtering device and the pump. The filtering device is arranged between the inlet and the pump so as to fluidically connect said inlet and pump

A device for repairing damage to a bottom of a container filled with water is disclosed. The device comprises a guiding device, which can be placed on the bottom of the container and which has a centering device for centering the guiding device between wall sections of the bottom elements. The devices further comprises a fixing device for fixing the guiding device on the bottom of the container, a carrier, which can be guided along the guiding device and on which at least one pivot arm is arranged, and an accommodating element arranged at a free end of the pivot arm, for accommodating adhesive, with which part of a wall section of the bottom elements can be covered.