摘要:
A cask, comprising a shell body (101) having, therein, a basket (130) formed of square pipes (132) or plate-like members forming cells (131) for storing spent fuel assemblies and a neutron shielding body formed by filling a composition (106) for the neutron shielding body containing a neutron shielding material formed mainly of macro-molecules, a refractory material, and a density increasing agent between the shell body (101) and an outer tube (105) installed on the outer periphery of the shell body.
摘要:
Lightweight and rigid, leaded or lead-free integral radiation shielding structural compositions comprising two or more radiation attenuating elements or compounds thereof, selected for having compatible radiation attenuating characteristics, dispersed in a thermoplastic or thermoset resin. The radiation shielding structural compositions of the present invention can be used to functionally and structurally replace lead-lined structures in medical and industrial x-ray systems. The radiation shielding structural compositions of the present invention can also be formulated to minimize the density of the resulting structure.
摘要:
Procédé de réduction du radon dans un bâtiment dont l'atmosphère intérieure est susceptible d'atteindre une concentration en radon supérieure à 100 becquerel par m 3 , ledit procédé comprenant l'application sur un élément du gros-oeuvre dudit bâtiment d'une composition comprenant une résine époxy réticulable de type bisphénol A et un agent de réticulation, ladite composition étant appliquée à raison d'une dose correspondant à une dose de ladite résine comprise entre 300 et 1300 g/m 2 .
摘要翻译:在建筑物的内部气氛中减少建筑物中氡气达到> = 100贝克勒/ m 3>的敏感氡浓度的方法包括在建筑物的建筑构件的内表面或建筑物前处施加交联组合物 。 该组合物包含300-1300g / m 2>优选400-950g / m 2的交联性双酚-A环氧树脂和交联剂。
摘要:
The invention relates to a mixture containing a) at least 26 wt. % gadolinium and b) one or more elements, alloys and/or compounds from the group containing barium, indium, tin, lanthanum, molybdenum, niobium, tantalum, zirconium and tungsten. The invention also relates to a method for producing said mixture, to the use of the mixture for shielding radiation and for producing polymer radiation-shielding materials, to a method for producing rubber, thermoplastics and polyurethanes that shield radiation, to a method for producing products consisting of the polymer radiation-shielding materials, in addition to products consisting of said materials.
摘要:
A method for remediating non-homogeneous radioactive waste to significantly reduce the waste mass/volume and to convert such waste to products that meet federal regulatory compliance standards is disclosed. High level waste (HLW) stored in underground tanks is typically a multi component mixture. After removal of the waste from the tanks or other storage areas the waste is isolated in a thermal desorption-type reaction vessel where the waste is pyrolized at pre-determined and carefully controlled temperatures, pressures, and atmospheres. This process eliminates organics, volatile metals, moisture and other low boiling temperature/high vapor pressure components and converts non-volatile waste to more stable metal oxides. Off-gas treatment systems scrub, treat and dispose of all off-gas components. A thermal desorption-type apparatus especially well suited for performing the method of the present invention is also disclosed.
摘要:
L'invention se rapporte à un matériau de blindage neutronique et de maintien de la sous-criticité, ainsi qu'à un procédé de préparation de ce matériau et aux applications dudit matériau. Le matériau comprend une matrice à base d'une résine vinylester, au moins un polyamide et une charge inorganique capable de ralentir et d'absorber les neutrons. Applications : réalisation d'écrans neutroniques dans des emballages pour le transport, l'entreposage et/ou le stockage de matières radioactives, notamment d'assemblages de combustibles nucléaires neufs.
摘要:
A period of time taken in manufacture of a cask for transportation and storage of spent fuel is shortened, and a radiation shielding capacity of a spent fuel cask is made uniform in an axial direction thereof. A kneaded substance comprising a resin and a powder neutron absorber is injected into a horizontal mold. Subsequently, an operation of curing is performed. The resulting neutron shield body is taken out from the mold and is mounted between fins which are provided on an outside of an inner cylinder of a spent fuel cask. An outer cylinder is mounted on the fins to cover the neutron shield body.
摘要:
The present invention is a shielding material that resists both nuclear radiation and high temperatures and is especially suited to encasing radioactive waster materials to immobilize them. The material is a mixture comprised of two or more organic polymers in which included fillers are cross-linked within the phenylic side chains of the polymers and copolymers. Other fillers provide radioactive shielding and may be merely included within the cross-linked matrix. The material contains a tough matrix with embedded particles of radiation shielding substances and thermoconductive materials with an overall ceramic-like or ceramometallic properties. The material is thermosetting and can present an extremely hard material -e.g., 20,000 p.s.i. shear strength. The material is comprised of a mixture of vulcanized rubber and/or rubber-like polymers, various radiation shielding inclusions, polyimide resin and phenolformaldehyde resin. After being mixed in the proper proportions the material sets up at an elevated temperature (e.g., 260 °C). The final material has a density of between 8 and 50 pounds per cubic foot depending on the proportion and identity of the radiation resistant inclusions.