RU2216060C2 - Device for discharging radioactive sorbent from exchanger to container - Google Patents

Abstract

FIELD: decontamination of water coolants. SUBSTANCE: device has housing, drive, movable rod, flange, movable vertical tube, and collecting tubes. Butt- ends of flanged housing are sealed and side surface has vertical slit passing upper bent-out section of movable tube. Removable duct provided with bottom drain hole and drain tube is secured to housing through sealed flanged joint. Duct accommodates flexible hose fastened to upper section of movable tube and to inlet nozzle. The latter communicates with drain tube and is connected to outlet piping that passes sorbent to container. EFFECT: enhanced safety of device. 1 cl, 1 dwg

Description

 This invention relates to the purification of aqueous coolants, and in particular to devices for unloading radioactive sorbents from high-temperature filters for cleaning the coolant of the primary circuit of a nuclear power plant.

 A device for unloading cartridge filters containing a device for loosening the filter material and a suction system [1].

 With this device, you can unload only ordinary bulk filter material, but it is not suitable for unloading radioactive bulk material from filters, since such devices are required to increase safety during unloading.

 The closest technical solution to the proposed one is a device for unloading a radioactive sorbent from a filter into a container containing a vertical pipe with a collecting nozzle in the lower section and an actuator for lifting and lowering the pipe, which is installed in the housing having a vertical slot for the passage of the upper pipe section. The device is also equipped with an inlet pipe for connection to the container and a flexible hose, one end of which is connected to the upper section of the pipe [2]. The filter is cleaned with a collecting nozzle, which is lowered into the sorbent by means of a lifting and lowering pipe, the sorbent is first loosened with compressed air, and then it is sent through a metal tube and flexible hose to a storage facility for radioactive waste, in this case, to a container. When a loosened radioactive sorbent passes under pressure inside a flexible hose, there is a danger of possible leakage of the radioactive sorbent and its exit to the outside of the device, since the flexible hose may lose its tightness. For this purpose, it is necessary to secure this section of the device for unloading the radioactive sorbent from possible leaks of radioactive material, thereby excluding the irradiation of maintenance personnel.

 The objective of the invention is to increase the safety of a working device.

 This object is achieved in that in a device for unloading a radioactive sorbent from a filter into a container containing a lifting and lowering vertical pipe installed in a housing having a vertical slot for the upper portion of the pipe, an inlet pipe for connecting to the container and a flexible hose, one end of which is connected to the upper portion of the pipe, new is that it is equipped with a duct that is hermetically fixed to the body, covering a vertical slot and having a drain hole and a drain pipe in the bottom, with that inlet connected to the free end of the flexible hose in the middle portion of the vertical wall of the box and bent down to the level of the drainage tube, which communicates with the inlet pipe.

 Placing a flexible hose inside a duct connected to the casing with a drain hole and a drainage pipe allows preventing the release of radioactive medium outside the device in case of leakage with a rubber-fabric hose, which corresponds to the rules and standards adopted in nuclear power engineering, increasing the radiation safety of maintenance personnel and organizing a tap in a timely manner possible accidental leaks.

 The invention is illustrated in the drawing, which shows a device for unloading a radioactive sorbent from a filter in section.

A device for unloading a radioactive sorbent from a filter into a container consists of a cylindrical body 1, to the top of which a drive 2 of a movable rod 3 is attached. Drive 2 allows you to convert the rotational movement of the handle into a lifting and lowering movement of the rod 3. The lower part of the housing 1 has a flange 5, with which the device for unloading the radioactive sorbent is mounted on the filter CBO-1. Inside the housing 1 on the rod 3 there is a vertical movable pipe 6, at the lower end of which are mounted three articulated collecting tubes 7, located at an angle of 120 ^o . At the ends of the housing 1 there are seals 8 designed to prevent radioactive leaks. A vertical slot 9 is made on the side surface of the housing 1, through which a bent upper portion of the movable pipe 6 is passed, and a flange connection 10, by means of which a removable box 11 is sealed to the housing 1, covering the vertical slot 9 and having a drain hole 12 and a drain in the bottom the tube 13. Inside the removable box 11 is placed rubber-fabric flexible hose 14, one end of which is attached to the bent upper portion of the movable pipe 6, and the other to the inlet pipe 15, which passes through the hole in the middle part of the vertical wall of the duct 11. The inlet pipe 15 is attached to the removable duct 11 by means of a flange 16, bent down to the level of the drain pipe 13, communicated with the latter and connected to a discharge pipe 17 made of steel pipes using flanges 18 and 19, mounted on the ends of the pipe 15 and the pipe 17. On the discharge pipe 17, the sorbent moves to the place of unloading in the container 20.

где L - высота короба,
d_н - наружный диаметр резинотканевого шланга,
а - зазор между наружной поверхностью резинотканевого шланга и стенкой короба,
В - ширина короба,
к - коэффициент, зависящий от внутреннего диаметра резинотканевого шланга,
d_вн - внутренний диаметр резинотканевого шланга,
S - величина хода подвижной трубы,
b - расстояние от места изгиба шланга до внутренней поверхности короба.The dimensions of the duct 11 in which the flexible hose is located depend on the stroke of the moving pipe 6 and the cross-sectional dimensions of the rubber-fabric hose 14 and are determined by the following relationships:
L = S + d _n + 2a,

where L is the height of the box,
d _n - the outer diameter of the rubber hose,
a - the gap between the outer surface of the rubber fabric hose and the wall of the duct,
In - the width of the box,
k is a coefficient depending on the inner diameter of the rubber-fabric hose,
d _VN - the inner diameter of the rubber hose,
S is the magnitude of the stroke of the movable pipe,
b is the distance from the place of bending of the hose to the inner surface of the duct.

 A device for unloading a radioactive sorbent from a filter works as follows: remove the standard plug from the neck of the filter CBO-1, bring together the collecting tubes 7 of the riser pipe 6, introduce them into the filter and place them on the surface of the sorbent in a diluted position. The housing 1 of the device is attached to the filter neck with a flange 5, and a flange 19 of the discharge pipe 17 is connected to the flange 18 of the inlet pipe 15.

 In the lower part of the filter through pipes 21 and 22 serves first compressed air to loosen the sorbent, and then water under pressure. Loosened sorbent entrained by the flow of water through the collecting tubes 7, the vertical pipe 6, the flexible hose 14 and the inlet pipe 15 enters the discharge pipe 17 and moves along it to the discharge point into the container 20. As the filter is emptied, the sorbent level decreases, the vertical pipe drops 6 and the flexible hose 14 bends. If the hose is bent several times under the influence of high water pressure, it may lead to leakage and weakening of the butt joints of the hose 14. In case of radioactive leaks, ednie will be collected at the bottom of the box and the drain tube 13 directed to the discharge line 17, thus the possible radioactive leaks quickly localized.

 The technical and economic effect is to increase the safety of the device.

Sources of information
1. RF patent 2066231 from 09.09.92, cl. B 01 D 35/16.

 2. The outline drawing of the device for unloading the sorbent 1158.84.11.000, released in 1981 (prototype).

Claims (1)

 A device for unloading a radioactive sorbent from a filter into a container containing a lifting and lowering vertical pipe installed in a housing having a vertical slot for the upper pipe section, an inlet pipe for connecting to the container and a flexible hose, one end of which is connected to the upper pipe section, characterized in that it is equipped with a box hermetically fixed to the housing, covering a vertical slot and having a drain hole and a drainage tube in the bottom, while the inlet pipe is connected to the freedoms the other end of the flexible hose in the middle of the vertical wall of the duct, bent down to the level of the drainage tube and communicated with it.