57 results about "Radioactive decontamination" patented technology

The invention relates to a vacuumable gel for decontaminating surfaces and to the use of said gel, whereby the decontamination can, for example, take the form of radioactive decontamination. The inventive gel comprises a colloidal solution and contains: between 5 and 25 wt.- % of an inorganic viscosifier in relation to the total weight of the gel; between 0.01 and 0.2 wt.- % of a surfactant in relation to the total weight of the gel and preferably less than 0.1 wt.- % of a surfactant in relation to the total weight of the gel; between 0.5 and 7 mol, per litre of gel, of an acid or an inorganic base; and, optionally, between 0.05 and 1 mol, per litre of gel, of an oxidising agent having a normal oxidation-reduction power E0 of greater than 1.4 V in a strong acid medium or of the reduced form of said oxidising agent, the remainder being water. The invention can be sprayed onto a surface that is to be decontaminated and removed in the form of dry residues by means of vacuuming or brushing after drying.

The present invention relates to a vacuumable gel and the gel use to decontaminate surfaces, for example, radioactive decontamination. The gel is composed of a colloidal solution comprising:from 5 to 25 wt % of an inorganic viscosity modifier;from 0.01 to 0.2 wt % of a surfactant, preferably, a surfactant in an amount strictly below 0.1 wt %, wt % relative to the total weight of the gel;from 0.5 to 7 mol, per liter of gel, of an inorganic acid or base; andoptionally from 0.05 to 1 mol, per liter of gel, of an oxidizer having a standard redox potential Eo greater than 1.4 V in a strong acid medium or of the reduced form of this oxidizer;the remainder being water.The gel may be applied, by spraying, to a surface to be decontaminated, and removed in the form of dry residues by suction or brushing after drying.

The invention discloses a radioactive dirt-removing high-strength strippable film as well as a preparation method and application thereof. The invention aims to solve the problems that the existing stripping type pressing dirt removing agent is mainly applied to pressing and removal of large-area radioactive fallout materials and has certain limitation on removal of loose pollution. The radioactive dirt-removing high-strength strippable film is prepared from the following raw materials in percentage by weight: 50 to 70 percent of polyisoprene, 0.3 to 3 percent of sulfur, 0.25 to 3 percent of nanometer white carbon black, 0.3 to 2 percent of an accelerant ZDC, 0.5 to 2 percent of an anti-ageing agent, 0.1 to 1 percent of zinc oxide, 0.05 to 1.0 percent of casein, 0.5 to 2 percent of EDTA, 0.02 to 0.5 percent of a dispersing agent BX, 20 to 40 percent of water and the like. The polyisoprene base material is subjected to vulcanization modification and is compounded with other components to obtain the radioactive dirt-removing high-strength strippable film, and the defects that the original strippable film has insufficient strength and is not liable to strip are effectively overcome. Through actual verification, the strippable dirt-removing agent has high film-forming strength and the tensile strength can reach 110 kg / cm<2>; and furthermore, in actual application, the surface pollution can be removed to below the clearance level (less than 0.08 Bq / cm<2>), and remarkable progressive significance is achieved.

The invention belongs to the technical field of nuclear power plant equipment radioactive decontamination, particularly relates to a cleaning tool for a detection device for a nuclear reactor rod cluster control assembly (RCCA). A connection plate is in a rectangular hollow cavity structure, a plurality of holes communicated with the rectangular hollow cavity are evenly distributed in one lateral surface, and two ashore air pipe connectors communicated with the rectangular hollow cavity are symmetrically installed on the other lateral surface. Cleaning rods are respectively in a cylindrical hollow cavity structure, wherein a plurality of air holes are evenly distributed in each cleaning rod. A connection handle is in a rectangular plate-shaped structure, wherein a plurality of through holes are evenly distributed in the connection handle. A plurality of the cleaning rods are combined into a cleaning rod group through the connection handle, the upper end of each cleaning rod is connected and fixed with one through hole in the connection handle and is connected with a corresponding hole in the connection plate through an air pipe, an air source is respectively connected with the two ashore air pipe connectors through a pipeline, and the pipelines between the air source and the two ashore air pipe connectors are sequentially provided with a stop valve and a pressure regulating valve. The cleaning tool for the detection device for the nuclear reactor RCCA is capable of effectively removing pollutant on the detection device, and lowering the radioactive dosage of the detection device.

The invention provides an ultra-low pressure reverse osmosis system. The feeding device is provided with a raw water tank, and the raw liquid at the outlet of the raw water tank is pressed into a multi-media filter through a centrifugal pump. The raw liquid enters the reverse osmosis membrane module for treatment, and the concentrated water outlet pipe of the reverse osmosis membrane module is provided with a valve to adjust the standard recovery rate of the system. It also discloses a method for treating iodide ions in radioactively polluted water by using the system, using a polyamide roll-type composite membrane, operating at an operating pressure of 0.3-0.8MPa, a temperature of 20±3°C, and a system standard recovery rate of 15.0%-17.0%. Under certain conditions, the radioactive decontamination factor of the reverse osmosis system for iodide ions can reach up to 920. The invention can effectively remove iodide ions in radioactively polluted water, has no phase change in the separation process, low energy consumption and operates at normal temperature. It has broad application prospects in the fields of emergency water supply, radioactive wastewater treatment and nuclear enrichment in sudden nuclear accidents.