RU2215350C1 - Stuffing penetration for electric lines with biological shielding components - Google Patents

Abstract

FIELD: stuffing arrangements for passing electric lines to ionizing radiation area separated by hermetically sealed partition. SUBSTANCE: proposed arrangement has cylindrical box with modules secured at its butt-ends and formed by power conductors, as well as biological shielding components in the form of box-mounted partitions with holes to receive modules as well as their rods and bushings coaxially disposed and spread along axis of modules; solid conductor of modules is composite structure whose parts and bushings interconnecting them form biological shielding components. EFFECT: enhanced reliability of biological shielding ; facilitated manufacture. 2 cl, 1 dwg

Description

 The invention relates to electrical engineering and can be used to ensure tight passage of conductors (wires, cables, harnesses) of electrical communications with the possibility of replacing them through a sealed partition separating the service area from the zone with ionizing radiation, at nuclear power plants, test benches and other similar objects.

 A device is known for introducing electrical conductors into the contaminated zone of a nuclear reactor through a sealed partition containing a detachable housing consisting of a hollow thin-walled cylinder and a hermetically docked bottom, movably mounted on rods embedded in a flange mounted on the input (see RF patent 2079912, N 01 B 17/26).

 The disadvantage of this design is the insufficient level of biological protection, determined mainly by the material of the flange.

 The closest technical solution to the claimed one is electric communication penetration, comprising a housing in which electrical conductors are combined into modules, a housing under the embedded element is made with a hole, its flanges (ends) with double walls, the inside of which are connected by hermetically sealed pipes in them, the means of connection with the elements of the external circuit are made in the form of sealed forks located at the ends of the modules, fixed in the holes of the outer walls of the flanges (ends); as a biological protection of the penetration, a cast-iron shot was used, which was poured between the outer (with the hole) body and the pipes connecting the inner walls of the flanges, as well as rings dressed on conductors (see RF patent 2077100, Н 01 В 17/26).

 The disadvantage of this design is the complexity of the penetration housing (double flanges and the combination of an unpressurized external housing with a system of pressurized pipes). The use of a filling fragment of biological protection requires a complex technology of high-quality filling of the penetration cavity with filling, protecting the environment from dust both during the filling process and during various subsequent impacts on the penetration. The use of biological protection as a fragment in ring modules has the disadvantage that a bundle of conductors passed through rings does not have a stable shape, density and, accordingly, a stable degree of attenuation of ionizing radiation and does not have reliability as an element of this protection.

 The task to which the invention is directed is to increase reliability and reduce the complexity of manufacturing.

 The technical result is the provision of biological protection of personnel at the installation site of penetration from ionizing radiation.

 This result is achieved by the fact that the biological protection elements are made in the form of partitions installed in the housing with openings for modules and rods included in the modules, located coaxially with the bushes and spaced relative to the latter.

 The same result is achieved if, in modules designed to transmit power current, the single-conductor conductor is made integral and its parts are connected by bushings forming biological protection elements.

 The drawing shows a structural diagram of the proposed device.

 The penetration 1, installed in a sealed partition 2, contains a cylindrical body 3 with modules fixed at its ends formed by electrical conductors 4 or 5 with a sleeve 6.

 As part of the biological protection are installed in the housing 3 of the partition 7 with holes for the modules and installed in the modules of the sleeve 8, as well as located coaxially with the sleeve 8 and spaced relative to the last rods 9.

 Modules with flexible conductors 4 can be equipped with a casing 10, which ensures the immobility of the sleeves 8 and rods 9. The outer diameter of the sleeves 8 is equal to the diameter of the holes in the partitions 7, the diameter of the rods 9 is equal to the diameter of the holes of the sleeves 8. The single-core power conductor in the modules is made integral in the form of a cut rod 5, the parts of which are interconnected by bushings 6 with an outer diameter equal to the diameter of the holes in the partitions 7, while the rod 5 and bushings 6 are elements of biological protection.

 The rods 9 and the sleeves 8 are used in modules with relatively thin flexible conductors 4 (wires, cables), which, after passing through the sleeves 8, are passed outside the rods 9.

 In modules providing the transmission of power current, a monolithic cross-section, but made by a composite rod 5, is used as a conductor, and the parts of the rod are interconnected mechanically and electrically by bushes 6.

 The proposed device operates as follows. The current is transferred from one zone of the object to another using electrical conductors 4 or 5 with a sleeve 6.

 Biological protection of personnel is ensured by the presence in the design of partitions 7, rods 5 and 9, and bushings 6 and 8, which, with the configuration described above, completely "overlap" the cross section of the penetration and, with appropriate longitudinal dimensions, attenuate ionizing radiation through the penetration 1 to the amount of attenuation by its partition 2. At the same time, the elements of biological protection due to the spacing of the rods 9 and the bushings 8 along the length of the modules do not prevent the laying of conductors 4 inside it.

 The proposed device is effective if the material of the elements of the biological protection of the penetration has a degree of absorption of ionizing radiation, significantly (more than twice) more than it has the material of the partition. For example, it is advisable to equip a penetration installed in a concrete partition with steel biological protection elements.

 Improving reliability is ensured by the use of only rigid elements in the construction of the tunneling that completely "overlap" the cross section of the tunneling from ionizing radiation; the presence of wires in the modules is not taken into account and goes to the reserve for this parameter.

 The overall simplicity of the construction contributes to the reduction of the labor input for the manufacturing of the sinking (the casing 3 is formed by the minimum number of parts - a cylindrical shell and two ends; when using a sealed casing 3, the casing 10 may be leaky, and not be present in the "power" modules). The simplicity of the design, combined with the rigid elements of biological protection, made it possible to abandon the backfill version used in the prototype, which was little compatible with the hygiene of electrical installation and vacuum checks and therefore labor-intensive.

Claims (2)

 1. The passage of electrical communications of conductors (cables) into a zone with ionizing radiation separated by a sealed partition, comprising a cylindrical body with modules fixed by electric conductors fixed at its ends, and biological protection elements located inside the housing and modules, characterized in that the biological protection elements are made in the form of partitions installed in the housing with holes for modules and rods included in the modules, located coaxially with the bushes and spaced apart tionary past.  2. Drilling according to claim 1, characterized in that the rod is used as a conductor, made integral, and its parts are connected by bushings forming elements of biological protection.