RU2429461C1 - Sampler of liquid radio-active waste - Google Patents

Abstract

FIELD: machine building.

SUBSTANCE: sampler consists of intake with external orifices and internal off-take channel communicated with sample intake vessel by means of flexible sampling hose. Also, the sampler consists of a vacuum-pump connected to the sample intake vessel, of pipelines, of valves for auxiliary and working operations of sampling, and devices for deactivation and washing a main of sampling intake. The sampler is equipped with intakes of liquid radio-active waste (LRW) with external orifices in internal off-take channels arranged stationary in points of intake and communicating with the sample intake vessel by means of flexible hoses. Further, the sampler includes electro-magnetic valves, an automated system of control of electro-magnetic valves, mains for sample intake, a system control panel, a sensor of sample level and a safety valve.

EFFECT: increased safety and reliability of sampling, simplified operation of LRW sampler.

2 cl, 2 dwg

Description

The invention relates to a device for sampling liquids and can be used in nuclear energy to monitor the state of liquid radioactive waste, and can also be used when working with aggressive liquids.

There is a sampler of liquid radioactive waste from storage tanks at nuclear power plants, taken as a prototype (RU 2347204 C1 dated 05/18/2007), which contains a vertically moving massive intake with external holes and an internal outlet channel, communicating with a flexible sampling hose with a sampling vessel. The sampler also contains a vacuum pump connected to the sampling vessel, means for fixing the depth of immersion of the intake in LRW, pipelines and valves for auxiliary and working sampling operations. The sampler is equipped with a device for decontamination and washing the inner surface of the flexible hose and the internal outlet channel of the intake. At the same time, it is equipped with a sealed remote chamber to accommodate the reserve stock of the flexible sampling hose, which is connected through a vertical pipe to the upper part of the LRW storage tank using a pipe penetration having a movable trace of the flexible sampling hose. The vertical pipe branch pipe is equipped with a device for decontamination and washing the outer surface of the flexible hose and intake.

The disadvantages of the prototype are:

1. The need for each sampling to install the sampling probe to the required depth manually.

2. The presence of a remote chamber to accommodate the reserve stock of a flexible sampling hose.

3. Communication of the volume of LRW capacity through an external chamber with the volume of the inhabited premises when sampling.

The present invention solves the problem of improving safety, reliability, as well as simplifying the operation of the sampler of liquid radioactive waste.

To obtain the specified technical result, a sampler with external openings and an internal outlet channel is connected to the liquid radioactive waste sampler, which is communicated using a flexible sampling hose with a sampling vessel, a vacuum pump connected to the sampling vessel, pipelines, valves for auxiliary and working sampling operations , devices for decontamination and washing of the sampling line.

Distinctive features of the proposed sampler from the prototype is that it is equipped with several LRW intakes located stationary at the sampling points and communicated using flexible hoses with a sampling vessel, electromagnetic valves, an automated control system for electromagnetic sampling valves, a control panel for the system, a sample level sensor, safety valve. The number of intakes depends on the number of fence points. The most rational is the location of the intakes through 500 mm.

Due to the presence of these signs, the operation of the LRW sampler is simplified due to the fact that the intakes are stationary at the required depth, the reliability and safety of the device are increased due to the automation of the sampling process.

The proposed device is illustrated by the diagram and drawings presented in figures 1 and 2.

Figure 1 shows a diagram of a device

Figure 2 shows a General view of the device.

Figure 1, 2 shows:

1 - sampling vessel

2 - boxing

3 - fence

4 - valve block

5 - safety valve

6 - vacuum pump

7 - valve

8, 9, 10 - hose

11 - stub

12 - level sensor

13 - manovacuum meter

14 - control panel

15-26 - valves used to set the required depth of sampling

27 - pressure equation valve

28 - valve for supplying the sample to the sampling vessel

29 - valve issuing samples in the sampling tank

30 - water supply valve (decontamination solution)

31 - sampling valve

32 - valve for supplying compressed air

33 - LRW capacity

34 - LRW tank box

35 - corridor

The device operates as follows: sampling, issuing a sample, flushing and purging the pipelines of the sampling line.

When sampling, power is supplied to the control panel 14, the button for opening the valve 15 corresponding to the smallest depth of sampling is pressed, then the "Sampling" button on the control panel 14 is pressed. When sampling from great depths, the keys to open valves 16-26 are used respectively. After pressing the key on the control panel "Sampling" valve 31 and valve 28 are opened, the vacuum pump 6 is turned on, which creates a vacuum in the pipe of the intake 3 (Fig. 2) with valve 28 (Fig. 1), which is controlled by a manovacuum meter 13 (Fig. .2). When a test occurs, on the contrary, the risks in the hose 8, the vacuum pump 6 is turned off by a signal from the level sensor 12 (figure 2) with the simultaneous closing of valves 31, 15 (16-26) and 28 (figure 1). If the level sensor 12 (Fig. 2) fails, the safety valve 5 (Fig. 1) closes, preventing the failure of the vacuum pump 6.

The issuance of the sample begins by pressing the key "Issue of the sample" on the control panel 14 (figure 2), then opens the valve 27 (figure 1). When you open it equalizes the pressure in the sampling vessel 1 (figure 2) with atmospheric pressure. Then the valve 29 is opened manually and the sample through the hose 10 (figure 2) enters the sampling tank. After draining the sample volume into the sampling container, the valve 29 (Fig. 1) is manually closed.

Next, the "Drainage" button on the control panel 14 is pressed and the remaining solution in the pipelines of the line is removed back to the LRW tank 33. At the same time, valves 31, 15 and 28 (Fig. 1) open again, with valve 27 already open, and under the influence of atmospheric pressure the solution from the pipeline returns to the LRW tank 33. Next, the valves 27 and 28 are closed, the valves 15 and 31 (Fig. 1) are open.

After removing the solution, the sampling line is flushed. Pressed the button "Flushing" on the control panel 14 (figure 2). This opens the valve 30 (Fig. 1) for a set time (according to the time relay) for supplying washing water with a pressure of 0.03 to 0.05 MPa (0.3 to 0.5 kg / cm ² ), after which the valve 30 closes.

After washing, the “Purge” button on the control panel 14 is pressed (FIG. 2) and the line is purged with compressed air. This opens the valve 32 (Fig. 1) for the set time (according to the time switch) with a pressure of 0.02 to 0.04 MPa (0.2 to 0.4 kgf / cm ² ), after which the valve 32 closes.

The washing of the sampling vessel 1 is carried out through the valves 27 and 29 (Fig. 1), for which the box 2 (Fig. 2) moves to the pit of the floor drain system in the room of the corridor 35, above which the plug 11 (Fig. 2) opens. At the end of the flushing (purging), the dose rate from the surface of the device is measured in accordance with radiation safety standards. If the permissible level of pollution is exceeded, decontamination is carried out with solutions approved for use at nuclear power plants. At the end of the process, the device is brought to its original position, the power is removed from the control panel 14 (figure 2).

Currently, manufacturing is being carried out with subsequent testing of the proposed device to prepare for its introduction at nuclear power plants.

Claims (2)

1. Sampler of liquid radioactive waste (LRW), including a sampler with external holes and an internal outlet channel, which is communicated via a flexible sampling hose with a sampling vessel, a vacuum pump connected to the sampling vessel, pipelines, valves for auxiliary and working sampling operations , devices for decontamination and washing of the sampling line, characterized in that it is equipped with LRW intakes with external holes and internal outlet channels, stationary at sampling points and communicating via flexible hoses with a sampling vessel, electromagnetic valves, an automated control system for the electromagnetic valves of the sampling line, a system control panel, a sample level sensor, and a safety valve. 2. The sampler of liquid radioactive waste according to claim 1, characterized in that the intakes are located 500 mm from each other.

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