[en] It is suggested that weighing problems in material charging into cement mixture homogenizers and their discharging can be solved by putting the homogenizer onto three supports, at least one of which is fitted with a tensometric sensor. Deviations of the sensor reading from zero for the empty homogenizer is indicative of solid cement mass sticking to the homogenizer walls. The arrangement eliminates the need to equip the homogenizer with scales, and its ruggedness makes the system shock-resistant, which is convenient particularly during transportation. The tensometer can be resistance type, electrically connected in the automated material charging circuit. (P.A.)

[en] The casing is designed for silicon crystal doping with phosphorus in a nuclear reactor. It enables the silicon crystals to be hydraulically transported into the irradiaton channel, and in the channel to be directly cooled with water. The casing is a body whose bottom is equipped with a valve formed by a disk with a shank and containing at least one hole; the lid of the body also contains at least one hole and can also be equipped with a valve. During the hydraulic transport of the casing in the horizontal and vertical segments of the transport piping, water cannot pass through it. As the casing reaches the bottom of the channel, the valve opens automatically and allows water to cool the crystal. If the lid is also fitted with a valve, the casing can be irradiated in the reverse position, i.e. with the lid against the bottom of the irradiation channel. (P.A.)

[en] The device is used in nuclear reactors for doping silicon crystals with phosphorus. It contains an irradiation channel attached to the supporting structure so that it can be rotated, and a device for replacement of the crystals. The crystals are accommodated in the irradiation channel on the two sides of the neutron flux density distribution symmetrically with respect to the maximum. The crystal replacement device consists of an inserting machine and a fixed storage container, or of a frame and a storage container coupled to a drive. At least one shielding ring is attached to the irradiation channel or to the supporting structure. In the half of the exposure time, always two crystals are interchanged in the irradiation channel, owing to which the two ends are irradiated uniformly. As a result, the variance of the specific resistance is reduced considerably. The shielding rings modify the resulting scattering. Several crystals can be irradiated simultaneously. (M.D.). 1 fig

[en] The lid of the homogenizer vessel with a stirrer and with bulk and liquid inlets is firmly attached to the homogenizer frame. The mixing vessel is screwed onto the lid and is connected to the frame with two moving arms. This allows to separate the mixing vessel from the lid without having to disconnect the supplies of bulk and liquid materials. The vessel is attached to swing arms pivoted in joints, which allows servicing, turning and tipping the vessel, thereby facilitating its emptying. This facilitates cleaning and reduces the maintenance time, thus increasing the safety of personnel. (J.B.). 2 figs

[en] The furnace is designed for the processing of liquid or loose solid, medium- or high-level radioactive wastes. The furnace lid is firmly attached to the frame. The furnace vessel is made of a refractory, corrosion resistant alloy, and it is attached to the bottom side of the lid using mechanisms remotely controlled with compressed air. The components connected to the lid and protruding into the melt, such as the tapping bar, are adapted to being remotely disassembled into two parts. The design enables the vessel to be lowered away. Remote dismantling of the furnace comprises three operations: disassembling the components connected to the lid and protruding into the melt, uncoupling the vessel from the lid, and lowering the vessel with the vitreous material into a shielded shipping container. (J.B.). 4 figs

[en] Mushy or liquid radioactive wastes are mixed with chemical additives, e.g., aluminium sulfate, colloidal silicon oxide, formic acid and cement suspension. The mix is heated to 100 to 320 degC. By drying the waste and by chemical reaction, a bulk intermediate product will be obtained which is homogenized with molten bitumen or organic polymers. The mass is then poured into containers where it will harden and will then be transported to the depository. The advantage of the method is that the final product is a stable mass resistant to separation, leaching and erosion, showing long-term storage safety. The main components of the installation are a mixed reactor, a doser of bulk material and a homogenizer which are series connected in that order. The apparatus is mounted on a support structure which may be divided into at least two parts. The advantage of this facility is that it is easily transported and can thereby be used for processing waste at source. (E.S.). 2 figs

[en] An electric induction furnace is proposed for radioactive waste vitrification, provided with a special equipment. It is built in a protective shielding case comprising a sliding table with a drive mechanism; access to the melting crucible is via a manipulator. Fitted above the crucible is a head with charge supply, exhaust removal and a locking window for melt sampling and thermocouple insertion. The mechanism is described in detail for vertical and horizontal crucible travel which is remotely controlled. The crucible consists of an inner steel crucible and an outer crucible of thermally and electrically insulating material, such as porous sintered aluminium oxide. The crucible bottom is provided with electrodes sensing the presence of the melt. (M.D.)

[en] Air is exhausted from the thermally insulated container and the whole of the container is then filled with the liquid coolant at normal temperature from a pressure cylinder. Following a loss of coolant in the course of the detector application the container will be cooled with liquid nitrogen by which the gaseous part of its content is transformed into the liquid phase and from the transport pressure cylinder the container is filled with coolant to full volume. (Ha)

[en] The concentrate of radioactive wastes is filled into a stainless steel container in which its chemical composition is adjusted. The treated concentrate is pumped int liquid scales from where the weighed concentrate is discharged into a homogenizer, or into a calciner. The calcinate from the calciner and the cement from the hopper are transported to hopper scales which are connected to the homogenizer. Here, a cement mass is produced which is discharged into tin drums. The equipment is divided into three independent transportable modules: the homogenizer module, the scales module and the calciner module. The total height of the assembled modules is 5.5 m. The cement hopper and the oblique cement transporter are outside the modules. The control panel with electronic equipment is also placed outside the modules. Three operators are required for the system. (E.S.)

[en] A geological probe is described featuring a radiation source and a semiconductor radiation detector cooled with melting solid coolant. Low operating temperature of the semiconductor detector must be maintained for high resolution. A coolant is used whose triple point temperature is lower than the required detector temperature. Prior to start-up, the coolant is transformed into the solid phase using liquid nitrogen. During measurement it remains at triple point temperature until its whole volume melts. The probe consists of an inner cylindrical vessel of conducting material placed below the detector, which contains the melting solid coolant and is heat-conductively connected to the detector. The outer cylindrical vessel surrounds the inner vessel and the detector and also forms the outer probe jacket. A sealed expansion vessel is connected to the outer vessel bottom. The main support structure of the inner vessel consists of a thin-walled tube of stainless steel filled with a nonconducting foamy material. The design reduces the probe outer diameter while maintaining the required cooling effect. (Pu)