An electrostatic induction system includes used activated carbon as electron-collecting units, to which electrons are supplied by an electrostatic induction apparatus so that impurities that have been absorbed by activated carbon are neutralized or reduced, and neutralized or reduced used activated carbon is acquired. The neutralized or reduced used activated carbon is buried in an environmental conservation implementation area in such a manner that an amount of the buried neutralized or reduced used activated carbon and a number of locations at which the neutralized or reduced used activated carbon are buried are adjusted depending on a property of the environmental conservation implementation area, and that the buried neutralized or reduced used activated carbon gradually decrease an earthing resistance of the environmental conservation implementation area so as to cause the earthing resistance to have a value less than or equal to 10.

The present invention relates to a method for removing cesium in a clay mineral using hydrogen peroxide. According to the present invention, cesium in a clay mineral is removed using hydrogen peroxide, which serves to induce interlayer expansion of the clay mineral to allow a cation to easily enter an interlayer of the clay mineral, and thus cesium desorption efficiency can be further improved. Also, the method according to the present invention can be efficiently used to restore soil in residential areas widely contaminated with a radionuclide when a major accident such as Fukushima nuclear accident occurs as well as various sites of atomic energy facilities contaminated with a radionuclide. Also, since radiation-contaminated soil is treated with only hydrogen peroxide and cations, secondary environmental pollution caused by wastes can be significantly reduce and the waste disposing cost can also be saved.

In a submersible ultrasonic cleaning system for use in highly radioactive environments (e.g., cleaning radiated nuclear fuel assemblies), a bond between energy producing transducers and an radiating wall is strengthened with a polyurethane adhesive such as Permabond PT326, or 3M DP-190 adhesive. In various diagnostic tests, one or more of the transducers are operated in an energy-transmitting mode while one or more other transducers are operated in an energy-detecting mode to detect a weakened transducer/wall bond and/or acoustic conditions of the working fluid.

A method of decontaminating metal surfaces in a cooling system of a nuclear reactor comprises: an oxidation step, comprising at least one acidic oxidation step and at least one alkaline oxidation step wherein metal oxides and radioisotopes on the metal surfaces are contacted with aqueous permanganate oxidant solutions; followed by a decontamination step wherein an aqueous solution comprising oxalic acid, formic acid, citric acid, tartaric acid, picolinic acid, gluconic acid glyoxylic acid or mixtures thereof is used to dissolve at least part of the metal oxides and radioisotopes; and a cleaning step wherein radioisotopes are immobilized on an ion exchange resin; wherein at least one treatment cycle includes a high temperature oxidation step, wherein the permanganate oxidant solution is kept at a temperature of at least 100 C.

A suctionable gel for eliminating a contaminating species contained in an organic layer on the surface of a material, consisting of a colloidal solution comprising, preferably consisting of: 1 wt % to 25 wt %, preferably 5 wt % to 20 wt % based on the total weight of the gel, of at least one inorganic viscosifying agent; 13 wt % to 99 wt %, preferably 80 wt % to 95 wt % based on the total weight of the gel, of an organic solvent selected among the terpenes and the mixtures thereof; optionally, 0.01 wt % to 10 wt %, based on the total weight of the gel, of at least one dye and/or pigment; optionally 0.1 wt % to 2 wt %, based on the total weight of the gel, of at least one surfactant. The disclosure further relates to a decontamination method using the gel.

Disclosed herein is a nuclear power plant main steam system, which reduces the atmospheric discharge of radioactive materials generated in an accident, the system including: a decontamination water tank containing decontamination water; and a connection pipe for connecting the decontamination water tank from a main steam pipe which connects a steam generator and a turbine, wherein the connection pipe is connected to the decontamination water tank through a main steam safety valve or a connection valve, wherein the main steam safety valve or the connection valve is configured by a three-way valve and is configured to discharge the generated steam to the air when an accident occurs within a design basis and to transfer the generated steam to the decontamination water tank when a severe accident occurs. A main steam system according to the present invention has an effect of reducing discharge of radioactive materials to the air when a containment bypass accident including a steam generator tube rupture caused by high-temperature steam occurs.

Provided is a long-lived fission product (LLFP) processing method using neutrons that enables generation of high-intensity neutrons using only an accelerator without a fast-neutron reactor or an accelerator-driven nuclear reactor and thereby enables efficient nuclear transmutation of long-lived fission products. In the processing method, neutron-containing primary particles such as deuterons are accelerated under specific conditions inside an FFAG accelerator (10) and are caused to collide with a plate-shaped target (18) to generate high-energy first neutrons that form a beam in a single direction through the break-up of the primary particles and low-energy diffuse second neutrons through excitation of atomic nuclei in the plate-shaped target. A first LLFP (20) is located in the direction of travel of the beam of the first neutrons and a second LLFP (24) is located in proximity to the plate-shaped target (18).

The present invention relates to a composition for removing a radionuclide, including: a first polymer including a hydroxy group; a second polymer into which a boronic acid group is introduced as a functional group; and an adsorbent for removing the radionuclide, and a method for removing a radionuclide using the same.

A device for submersibly cleaning surfaces inside a nuclear reactor includes a pump and a nozzle connected to said pump. The nozzle is arranged to face surfaces to be cleaned. The device includes cleaning means capable of removing debris on surfaces to be cleaned. The device includes adjustable flotation means, capable of adjusting the flotation capability of the device depending on a type of cleaning application.

An electrostatic induction system includes used activated carbon as electron-collecting units, to which electrons are supplied by an electrostatic induction apparatus so that impurities that have been absorbed by activated carbon are neutralized or reduced, and neutralized or reduced used activated carbon is acquired. The neutralized or reduced used activated carbon is buried in an environmental conservation implementation area in such a manner that an amount of the buried neutralized or reduced used activated carbon and a number of locations at which the neutralized or reduced used activated carbon are buried are adjusted depending on a property of the environmental conservation implementation area, and that the buried neutralized or reduced used activated carbon gradually decrease an earthing resistance of the environmental conservation implementation area so as to cause the earthing resistance to have a value less than or equal to 10.