Abstract

A bath electrical heating device for deactivation designed to provide heating of bath deactivation and the deactivating solution in it before deactivation of reactor facility equipment and ensuring the removal of excess heat in the process of deactivation. The invention improves reliability, reduces the material consumption of the device and simplifies the structure installation and repair. The device performs at least from three heat insulation blocks in the form of coaxial metal screens, installed with an air gap from the heater. The heater with current leads is made in hermetic perform, each heat insulation blocks supplemented with an air-gap coaxial metal protective casing. The air gap of which in the upper part is covered with a cap with a visor whose diameter exceeds the external diameter of the protective casing, wherein solid cover of the upper protective casing install a sealed coupling.

IPC Classes  ?

• F16L 53/38 - Ohmic-resistance heating using elongate electric heating elements, e.g. wires or ribbons
• H05B 3/58 - Heating hosesHeating collars
• H05B 3/26 - Heating elements having extended surface area substantially in a two-dimensional plane, e.g. plate-heater non-flexible heating conductor mounted on insulating base

Abstract

The invention relates to emergency protection of nuclear power plants, particularly to technologies for mitigation of consequences or fire prevention and prevention of explosive gas accumulation, which ensure hydrogen explosion safety in premises of the containment dome (hereinafter - CNT) at nuclear power plants (hereinafter - NPP) with water-cooled power reactor (hereinafter - VVER). Moreover, the offered invention can be used at other facilities having the risk of development of potentially hazardous emergency processes, related to the emission of a large amount of light combustible gas and its localization in closed premises of a facility. The technical result attained by the declared invention consists in the reduction of the risk of gas medium inflammation in premises of NPP CNT, as well as in the provision of self-damping of weak burning waves, reduction of their intensity in case of gas medium inflammation in premises of NPP CNT and in reduction of dynamic loads on walls of premises of NPP CNT. The specified technical result is attained due to the fact that in the method for ensuring hydrogen explosion safety at nuclear power plants, comprising ventilation of premises of the nuclear reactor premises and hydrogen recombination in premises of the nuclear reactor premises by its catalytic oxidation, in accordance with the declared solution, a reflector is placed on the way of potentially emergency propagation of a pressure hydrogen-containing steam-gas jet, apertures are made in the walls between premises of the nuclear reactor containment dome with a size equal to minimum 35% of the surface area of the said walls, while excess heat is withdrawn in areas of potential localization of hydrogen-containing steam-gas mixture burning sources.

IPC Classes  ?

• G21D 3/04 - Safety arrangements

Abstract

Non-Volume displacement pumps used at nuclear power plants (NPP) in reactor coolant pump sets for the primary coolant circuit of the nuclear power system. The reactor coolant pump set comprising a vertical vane-type single-stage pump with bottom arrangement of the impeller, the pump shaft is connected to the electric motor shaft by a rigid coupling, the radial-axial bearing, installed in the electric motor upper chamber, is made of two main elements: a radial bearing made in the form of a rotor metallic bushing installed on the cylindrical part of the collar and an axial bearing consisting of two stator lever-type balance arm systems with cover plates of antifriction material and rotor cover plates of antifriction material. The radial-axial bearing is cooled by water from the NPP system, pressure head whereof is increased by the screw-type pump located on the upper butt of the radial-axial bearing collar.

IPC Classes  ?

• F04D 29/58 - CoolingHeatingDiminishing heat transfer
• F04D 29/047 - Bearings hydrostaticBearings hydrodynamic
• F04D 13/02 - Units comprising pumps and their driving means
• F04D 13/06 - Units comprising pumps and their driving means the pump being electrically driven

Abstract

The invention relates to automated control methods and can be used to manage the life cycle of complex engineering facilities 5, for example, such as nuclear and thermal power plants, hydroelectric power plants, etc. The invention can be applied at the stages of design, construction, operation and disposal of a complex engineering facility.The system of life cycle management of a complex engineering facility ensures configuration management, that is, it ensures process 10 of identifying and documenting the characteristics of structures, systems, and elements of a facility, and ensures that changes to these characteristics are properly designed, verified, approved, released, implemented, tested, recorded, and reflected in the documentation for the facility.The technical result achieved by using invention 15 is to increase the speed of access to relevant and verified information at any stage of the life cycle of a complex engineering facility, to make safe and cost-effective decisions, as well as to increase the reliability of the process of managing (controlling) changes in facility state by applying clear correspondence of the documentation status for the facility and the associated 20 array of smart data placed in the system, including all necessary information on the requirements for the facility, facility elements and consolidated 3D model of the facility.

IPC Classes  ?

• G06F 16/93 - Document management systems
• G06Q 10/063 - Operations research, analysis or management

Abstract

The invention relates to the nuclear power industry, and more particularly to heat insulation for pipes and reactor facility equipment to reduce heat loss and simplify installation and maintenance of the claimed device. The claimed pipe insulation comprises individual blocks disposed on the outer surface of a pipe, said blocks being in the form of welded casings made of corrosion-resistant stainless steel, which have a heat insulating material disposed therein and are fastened to one another by quick-action tension screws, wherein the joins between the blocks are covered by plates, a set of at least three corrugated screens made of corrosion-resistant stainless thin-gauge sheet steel are used as the heat insulating material, said screens forming closed air cavities, and the outer face sheets of adjacent blocks are shorter than the length of the blocks themselves by the size of the plates and are mounted such as to leave a lateral open ventilating air gap relative to the outer surface of the set of screens. The plates are in the form of twined sections comprised of a multi-layered set of corrosion-resistant stainless thin-gauge corrugated steel, the twined sections are connected to one another by quick-action tension screws, and the width of the plates is designed to cover the elevated temperature region at the joins between the blocks.

IPC Classes  ?

• F16L 59/06 - Arrangements using an air layer or vacuum

Abstract

A system for dividing a pressurized volume of a containment building of a nuclear power plant relates to the field of providing for safe operation of a nuclear power plant in various regimes, including emergency regimes, and is directed towards allowing monitoring of air flows in a containment building of a nuclear power plant. A system for dividing a pressurized volume of a containment building of a nuclear power plant into isolated rooms comprises a device for dividing the pressurized volume, which device is arranged in an annular gap between a floor dividing the rooms and a wall of the containment building, an air supply device and an annular collector which is connected to the latter and is connected to inflatable shutters which are capable, in a state filled with air, of isolating air environments of rooms of the containment building and, in a deflated state, of connecting air environments of rooms of the containment building. In an emergency regime, an air supply to the inflatable shutters is stopped, the latter are lowered, completely opening the annular gap and allowing convection throughout the volume of the containment building. The system for dividing a pressurized volume can be used in containment buildings of nuclear power plants of any type.

IPC Classes  ?

• G21C 9/004 - Pressure suppression

Abstract

A system for dividing a pressurized volume of a containment building of a nuclear power plant relates to the field of providing for safe operation of a nuclear power plant in various regimes, including emergency regimes, and is directed towards allowing monitoring of air flows in a containment building of a nuclear power plant. A system for dividing a pressurized volume of a containment building of a nuclear power plant into isolated rooms comprises a device for dividing the pressurized volume, which device is arranged in an annular gap between a floor dividing the rooms and a wall of the containment building, an air supply device and an annular collector which is connected to the latter and is connected to inflatable shutters which are capable, in a state filled with air, of isolating air environments of rooms of the containment building and, in a deflated state, of connecting air environments of rooms of the containment building. In an emergency regime, an air supply to the inflatable shutters is stopped, the latter are lowered, completely opening the annular gap and allowing convection throughout the volume of the containment building. The system for dividing a pressurized volume can be used in containment buildings of nuclear power plants of any type.

IPC Classes  ?

• G21C 9/004 - Pressure suppression

Abstract

The invention relates to nuclear power engineering. An electrical heating device for a vertical decontamination bath comprises, on the outer surface of a decontamination bath, a heater made of a cable with high electrical resistivity and having current leads and coupling sleeves, and further comprises heat insulation units. The heat insulation units are in the form of coaxial metal screens mounted with an air gap from the heater. The heater and current leads are sealed. Each heat insulation unit additionally comprises a coaxial metal protective case. An air gap between heat insulation unit and protective case is closed at the top by a cover with a lip. A sealed coupling sleeve is mounted on a continuous cover of the upper protective case. Through openings are provided in the upper and lower parts of the side surface of the protective case. The invention provides a device which is more reliable, less material-intensive, and easier to assemble and repair.

IPC Classes  ?

• F16L 53/00 - Heating of pipes or pipe systemsCooling of pipes or pipe systems
• G21F 9/28 - Treating solids
• F16L 59/06 - Arrangements using an air layer or vacuum

Abstract

A system for detecting leaks of liquid from a spent fuel pool relates to the field of measuring and testing equipment and is intended for monitoring leaks in tanks, primarily in the storage pools of nuclear power plants. In the system for detecting leaks of liquid from a spent fuel pool, the weld seams of the storage pool are additionally provided with a hermetic metallic barrier connected by valved tubes to a pipeline, the two ends of which are connected via a collection valve and a return valve respectively to a leak collection tank equipped with a liquid level sensor. The system for detecting leaks of liquid from a spent fuel pool makes it possible to monitor the leak tightness of the weld seams of a spent fuel pool and to identify weld seams that have lost their leak tightness without first drying the storage pool, thus raising the radiation safety of storage pools and reducing their repair time.

IPC Classes  ?

• G01M 3/00 - Investigating fluid tightness of structures
• G21F 7/00 - Shielded cells or rooms

Abstract

A system for detecting leaks of liquid from a spent fuel pool relates to the field of measuring and testing equipment and is intended for monitoring leaks in tanks, primarily in the storage pools of nuclear power plants. In the system for detecting leaks of liquid from a spent fuel pool, the weld seams of the storage pool are additionally provided with a hermetic metallic barrier connected by valved tubes to a pipeline, the two ends of which are connected via a collection valve and a return valve respectively to a leak collection tank equipped with a liquid level sensor. The system for detecting leaks of liquid from a spent fuel pool makes it possible to monitor the leak tightness of the weld seams of a spent fuel pool and to identify weld seams that have lost their leak tightness without first drying the storage pool, thus raising the radiation safety of storage pools and reducing their repair time.

IPC Classes  ?

• G01M 3/00 - Investigating fluid tightness of structures
• G21F 7/00 - Shielded cells or rooms

Abstract

A multistage face seal design is provided, comprising mounted in series work stages and end stage, each including a rotor element, a spring-assisted axially movable stator element contacting it, sealed relatively to casing with an 0-ring, at the same time the cavities of high and low pressure of work stages are connected in series with restricted openings made in the stator element.

IPC Classes  ?

• F04D 29/08 - Sealings
• F16J 15/34 - Sealings between relatively-moving surfaces with slip-ring pressed against a more or less radial face on one member

Abstract

The invention relates to end rotor seals installed in pump assemblies for the separation of media or pressure difference. The invention can be utilized in the design of pumps used in nuclear power stations, particularly main circulation pumps. The invention is aimed at increasing the reliability of the unit, as well as improving the manufacturability of components and the installation of the seal. In order to achieve the corresponding technical results, a multistage end seal design is proposed, comprising consecutively arranged working stages and an end stage, each of which comprises a rotor element arranged on a shaft, and a spring-loaded axially displaceable stator element connected to said rotor element and sealed with respect to the housing by means of sealing rings, wherein low- and high-pressure chambers of the working stages are consecutively connected by throttle openings in the stator element, which is configured so as to carry out the functions of an axially displaceable stepped piston which is sealed with respect to the housing. The outside diameters of the steps of the stator element piston are in the ratio (I), where D2 is the diameter of the larger cylinder of the piston, and D1 is the diameter of the smaller cylinder of the piston. This ratio ensures there is no additional force on the stator element when in normal operation, while, when the seal is open, allowing the action on the stator element to be increased by means of hydrostatic forces acting on the piston, said action being aimed at closing the seal.

IPC Classes  ?

• F16J 15/34 - Sealings between relatively-moving surfaces with slip-ring pressed against a more or less radial face on one member
• F04D 29/08 - Sealings

Abstract

There is disclosed herein a reactor coolant pump set comprising a vertical vane-type single-stage pump with bottom arrangement of the impeller, the pump shaft is connected to the electric motor shaft by a rigid coupling, the radial-axial bearing, installed in the electric motor upper chamber, is made of two main elements:a radial bearing made in the form of a rotor metallic bushing installed on the cylindrical part of the collar, installed on the motor shaft by way of cone fitting and fastened by means of bolts and a pressure flange on the upper butt of the electric motor shaft, and an axial bearing consisting of two stator lever-type balance arm systems with cover plates of anti friction material and rotor cover plates of antifriction material, installed on the flat part of the collar.

IPC Classes  ?

• F04D 13/06 - Units comprising pumps and their driving means the pump being electrically driven
• F04D 29/047 - Bearings hydrostaticBearings hydrodynamic
• F04D 29/58 - CoolingHeatingDiminishing heat transfer
• F16C 17/02 - Sliding-contact bearings for exclusively rotary movement for radial load only
• G21C 15/243 - Promoting flow of the coolant for liquids
• G21D 1/04 - Pumping arrangements

Abstract

The invention relates to non-positive displacement pumps and can be used in nuclear power plants. Claimed is a circulating pump assembly comprising a vertical single-stage rotary vane pump with an impeller in a bottom position, in which the pump shaft is coupled to the shaft of an electric motor by a rigid coupling, and a radial/axial bearing is mounted in the upper chamber of the electric motor and is comprised of a radial bearing in the form of a metal rotary bushing mounted on the cylindrical portion of a collar, which is mounted on the motor shaft via a conical seat and is fastened by bolts and a pressure flange to the top end of the motor shaft, and a stator bushing made of an anti-friction material, and of an axial bearing consisting of two stator lever-type balancing systems with linings made of an anti-friction material, and rotor linings made of an anti-friction material, which are mounted on the flat portion of the collar. The radial/axial bearing is cooled with water that is pressurized by a screw pump, which is situated at the top end of the collar of the radial/axial bearing and consists of a stator bushing and a rotary bushing with a screw thread. The invention is directed toward enabling lubrication of the axial and radial bearings of an electric motor with water, thereby improving the fire safety of a plant unit.

IPC Classes  ?

• F04D 13/06 - Units comprising pumps and their driving means the pump being electrically driven
• F04D 29/047 - Bearings hydrostaticBearings hydrodynamic
• F04D 29/58 - CoolingHeatingDiminishing heat transfer
• G21D 1/04 - Pumping arrangements
• G21C 15/243 - Promoting flow of the coolant for liquids
• F16C 17/02 - Sliding-contact bearings for exclusively rotary movement for radial load only

Abstract

Disclosed is an electromagnetic device comprising several windings mutually offset in a longitudinal direction. The cross products of the magnetic moments of adjacent windings point in the same direction away from the plane formed by the magnetic moments of any pair of adjacent windings. The technical result is the generation of a magnetic field primarily on one side of the device.

IPC Classes  ?

• B60L 13/04 - Magnetic suspension or levitation for vehicles
• B61B 13/08 - Sliding or levitation systems
• H02N 15/00 - Holding or levitation devices using magnetic attraction or repulsion, not otherwise provided for

Abstract

Proposed is a vehicle magnetic suspension, specifically a vehicle magnetic suspension for a combined transport route having a ferromagnetic guide and a conductive surface. The suspension contains a magnetic device which is carried out and/or installed in such a way as to form a magnetic field capable of subsequently interacting with the ferromagnetic guide and with the conductive surface. The invention combines the advantages of magnetic levitation with attraction to a ferromagnetic guide and repulsion from a conductive surface.

IPC Classes  ?

• B60L 13/04 - Magnetic suspension or levitation for vehicles
• B61B 13/08 - Sliding or levitation systems
• H02N 15/00 - Holding or levitation devices using magnetic attraction or repulsion, not otherwise provided for

Abstract

What is proposed is: magnetic suspension for a vehicle for a flyover crossing with a ferromagnetic rail of arbitrary cross section, said magnetic suspension comprising permanent magnets and electromagnets mounted so as to be able to be attracted to the ferromagnetic rail. The permanent magnets are mounted such that the force of attraction to the ferromagnetic rail can be adjusted. The position and/or the mass of the permanent magnets can adapt the suspension for a vehicle and for the load being transported before the beginning of movement.

IPC Classes  ?

• B60L 13/04 - Magnetic suspension or levitation for vehicles
• B61B 13/08 - Sliding or levitation systems
• H02N 15/00 - Holding or levitation devices using magnetic attraction or repulsion, not otherwise provided for

Abstract

The invention relates to steam generators for nuclear power plants. The present steam generator comprises a horizontal housing, a primary loop inlet header and a primary loop outlet header, which are arranged horizontally, heat exchange tubes, which are arranged in vertical planes, and a feedwater dispensing device. The invention is directed toward reducing thermohydraulic inequality in a steam generator, achieving better filling of the steam generator with heat exchange tubes, and reducing the concentration of corrosive impurities in the region of the weld seam between the primary loop headers and the horizontal housing.

IPC Classes  ?

• F22B 1/02 - Methods of steam generation characterised by form of heating method by exploitation of the heat content of hot heat carriers
• F22B 37/66 - Mounting of, or supporting arrangements for, tube units involving vertically-disposed water tubes
• F22B 37/68 - Mounting of, or supporting arrangements for, tube units involving horizontally-disposed water tubes

Abstract

There is disclosed herein a pipeline leakage detection device with a metal protective casing installed coaxially on a metal pipe 2 with a radial clearance 1, where casing is performed as a joint of, for example, four arch shaped metal sheets 4 bent across the pipe 2. Sheets 4 straight line edges 7 are joined with one another by means of a dielectric washer 8, and sheets 4 arch shaped edges 9 are joined with one another by means of a dielectric ring 10. Ring 10 flanks 15 and 16 have ring grooves 17 and 18 on them for sheets 10 arch shaped edges 9 installation. Across each sheet 10 arch shaped edge 9 there are lamels shaped electric connectors 21 installed in ring grooves 17 and 18 for sheet 4 arch shaped edge 9 fixation. Electric connector terminals 30 are fastened on the ring 10 external surface 22 and are separately connected to each lamel 21.

IPC Classes  ?

• F17D 5/04 - Preventing, monitoring, or locating loss by means of a signalling fluid enclosed in a double wall
• G01M 3/16 - Investigating fluid tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using electric detection means

Abstract

A device for detecting leaks of an aqueous heat transfer medium comprises a protective casing coaxially mounted on a metal pipe (2) such that an annular gap (1) is provided, said protective casing being comprised of four metal sheets (4) curved arcuately around the pipe (2). The straight edges of the sheets (4) are connected to one another by means of a dielectric pad, and the curved edges (9) of the sheets (4) are connected to one another by means of a dielectric ring (10). The faces (15) and (16) of the ring (10) are each provided with an annular groove (17) and (18) for accommodating the curved edges (9). Opposite each curved edge (9) in the annular grooves (17) and (18) there are mounted electrical connectors in the form of lamellae for securing the curved edge (9). Contact terminals (30) are fastened on the outside surface (22) of the ring (10) and are individually connected to each lamella. A measuring instrument (33) is connected by conductors (32) to a terminal (31) on the pipe (2) and to the contact terminals (30) on the ring (10) in order to determine the electrical resistance of thermal insulation (3) in the annular gap (1). The invention increases the accuracy with which the site of a leak is detected and simplifies the maintenance of thermally insulated pipelines.

IPC Classes  ?

• F17D 5/04 - Preventing, monitoring, or locating loss by means of a signalling fluid enclosed in a double wall
• G01M 3/16 - Investigating fluid tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using electric detection means

Abstract

Disclosed is an electromagnetic device comprising several windings mutually offset in a longitudinal direction. The cross products of the magnetic moments of adjacent windings point in the same direction away from the plane formed by the magnetic moments of any pair of adjacent windings. At least a portion of the windings is situated in a receptacle containing a coolant which provides for superconductivity of the windings. The technical result is the generation of a magnetic field primarily on one side of the device.

IPC Classes  ?

• B60L 13/04 - Magnetic suspension or levitation for vehicles
• B61B 13/08 - Sliding or levitation systems
• H01F 6/04 - Cooling
• H02N 15/00 - Holding or levitation devices using magnetic attraction or repulsion, not otherwise provided for

Abstract

The group of inventions relates to heat transfer technology. The device includes a tank with an outlet pipe and steam source, a deaerator column with a lid, and, positioned thereon, pipes for supplying water and purging vapor, the column containing an upper deaeration stage and a lower deaeration stage. Each stage includes a pressure plate and a distribution plate, which are installed so as to form a jet chamber in the space therebetween, and also includes attachments having irregularly-positioned elements. The deaeration stages are separated by a hydraulic seal formed by a sidewall of the pressure plate of the upper stage and by a protrusion which is connected to the lid of the deaeration column. The pipes for supplying water and purging vapor are located in a protrusion of the hydraulic seal, said protrusion being provided with apertures. The lower edges of the apertures are located above the upper edge of a sidewall of the hydraulic seal by an amount which exceeds the sum of the height of coolant overflow over the sidewall of the hydraulic seal and the hydraulic resistance of a channel of the hydraulic seal. The total cross-section of the apertures is determined so as to achieve steam pressure which is the same in the purging pipe as in the space in the protrusion of the hydraulic seal. The present invention increases operational reliability.

IPC Classes  ?

• F22D 1/50 - Feed-water heaters, e.g. preheaters incorporating thermal de-aeration of feed-water

Abstract

The group of inventions refers to heat exchange machinery. The device includes a tank with an outlet fitting and a steam source, a deaerator column with a cover and water inlet and vapor blowdown fittings located on the same, containing lower and upper deaeration sections. Each section includes pressure and distribution trays forming a jet chamber in the space between them, and random element packing. Deaeration sections are separated by a hydraulic seal formed by the edge of the upper section pressure tray and the projection connected to the deaerator column cover. The water inlet and vapor blowdown fittings are located inside the hydraulic seal projection with openings in it. The lower edges of the openings are located higher than the upper edge of the hydraulic seal by a value exceeding the sum of overflow height of the coolant over the edge and hydraulic resistance of the hydraulic seal channel. The total cross section of the openings is determined by equality of steam pressure in the blowdown fitting and in the space inside the hydraulic seal projection. This increases the operation reliability.

IPC Classes  ?

• F22D 1/50 - Feed-water heaters, e.g. preheaters incorporating thermal de-aeration of feed-water