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224 results about "Dry storage" patented technology

Method of removing radioactive materials from a submerged state and/or preparing spent nuclear fuel for dry storage

A system, apparatus and method of processing and / or removing radioactive materials from a body of water that utilizes the buoyancy of the water itself to minimize the load experienced by a crane and / or other lifting equipment. In one aspect, the invention is a method comprising: a) submerging a container having a top, a bottom, and a cavity in a body of water having a surface level, the cavity filling with water; b) positioning radioactive material within the cavity of the submerged container; c) raising the submerged container until the top of the containment apparatus is above the surface level of the body of water while a major portion of the container remains below the surface level of the body of water; and d) removing bulk water from the cavity while the top of the container remains above the surface level of the body of water and a portion of the container remains submerged. The bulk water can be added back into the cavity to add neutron shielding after the container is placed in a staging area and prior to personnel performing the desired operations to the container. As a result, gamma radiation and neutron shielding of the container can be maximized for any crane capacity.
Owner:HOLTEC INT

Thermoplastic polyurethane hollow fiber membrane and preparation method thereof

The invention discloses a thermoplastic polyurethane hollow fiber membrane and a preparation method thereof. The hollow fiber membrane is made of polyurethane and prepared by adopting a thermally induced phase separation process. The preparation method comprises the following steps of: mixing thermoplastic polyurethane, thinner, inorganic pore-forming agent and antioxidant uniformly by using a high-speed stirrer, melting and extruding the mixture into granules by using a double-screw extruder, then melting and extruding the granules into hollow fibers by using a single-screw extruder, performing cooling molding, and finally extracting the thinner and the inorganic pore-forming agent in the hollow fibers. The prepared thermoplastic polyurethane hollow fiber membrane has the advantages of high flux, tensile strength and compressive strength, good flexibility of membrane silks, high elongation of the membrane silks at break, good chemical tolerance, permanent hydrophilic property, dry storage and the like. The fiber membrane can be applied to filtration of household and commercial drinking water, filtration and purification of brewed wine, food and medicaments, municipal tap water and sewage treatment, industrial sewage treatment, sea water desalinization pretreatment and the like.
Owner:HUIZHOU QIXIN MEMBRANE PURIFICATION & ENVIRONMENTPROTECTION

Transfer container for dry storage of nuclear power plant spent fuel

The invention discloses a transfer container for dry storage of nuclear powder plant spent fuel. The transfer container comprises a barrel body, a top cover arranged on the upper end face of the barrel body and a bottom cover arranged on the lower end face of the barrel body. The top cover and the barrel body are detachably and fixedly connected. The wall of the barrel body is of a hollow interlayer structure and comprises an inner barrel wall, an outer barrel wall and an inner cavity defined by the inner barrel wall and the outer barrel wall. The inner cavity is filled with a lead layer and a boron-containing resin plate layer. A middle shell wall is arranged between the lead layer and the boron-containing resin plate layer for partition. A waveform heat transfer plate is arranged in the boron-containing resin plate layer and makes face contact with the outer barrel wall and the middle shell wall. Compared with the prior art, the transfer container for dry storage of nuclear powder plant spent fuel has a reliable neutron shield function and excellent heat conducting property, can provide structural protection and radiation shield for a fuel storage pot when fuel is loaded in the fuel storage pot and can achieve the transfer function from the fuel storage pot to a concrete storage container.
Owner:中广核工程有限公司 +1

Preparation method of high-temperature structure-function combining B4C/Al neutron absorbing material

The invention relates to a preparation method of a high-temperature structure-function combining B4C/Al neutron absorbing material. The preparation method comprises the concrete steps of (1) adopting a high energy ball milling method for ball-milling aluminum powder into flake aluminum powder; (2) placing the flake aluminum powder into an air furnace for pre-oxidizing, and forming a layer of nanometer aluminum oxide film on the surface of the aluminum powder; (3) uniformly mixing the pre-oxidized flake aluminum powder and micron-sized B4C particles; (4) pressing molding the uniformly mixed powder; (5) conducting pressureless sintering or hot pressed sintering on a pressing-molded pressing blank; and (6) forging, extruding or rolling a sintered billet so as to obtain the high-temperature structure-function combining B4C/Al neutron absorbing sectional material or sheet material. By adopting the method, a certain amount of nanometer aluminum oxide can be introduced into a pure aluminum matrix, and the micron-sized B4C particles are added, so that the aluminum-based neutron absorbing material with two-phase reinforcement of micron B4C and nano Al2O3 can be prepared, has both a neutron absorbing performance and an excellent high-temperature mechanical property, and can be applied in the fields of spent fuel dry storage, transportation and the like.
Owner:INST OF METAL RESEARCH - CHINESE ACAD OF SCI

Fully automatic dehumidification safety tool cabinet

The invention relates to a fully automatic dehumidification safety tool cabinet used in the power industry, and aims to solve the problem of providing the safety tool cabinet which has the advantages of small and skilful size, good dehumidification effect, high automation degree and capability of quickly creating a dry storage environment with proper temperature for power tools and instrument. The fully automatic dehumidification safety tool cabinet consists of a cabinet body, a cabinet door, an exhaust device, a heating device, an automatic control system and a temperature display screen, wherein a partition plate is arranged in the cabinet body and is provided with air holes; the top of the cabinet body is provided with an air outlet; the exhaust device which can be used for opening and closing the air outlet is arranged on the air outlet; the heating device is arranged at the bottom in the cabinet body; and the heating device, the exhaust device and the temperature display screen are connected to the automatic control system. The fully automatic dehumidification safety tool cabinet has the positive effects of dust prevention, sanitation, automatic moisture protection and dehumidification, convenience for use, safety and reliability; heating time, exhaust time and the like can be set according to requirements; the dehumidification effect is quick and good; and the fully automatic dehumidification safety tool cabinet is suitable for being promoted and applied in the power industry.
Owner:商丘市天宇电力工程有限公司
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