CN213749245U

CN213749245U - A sampling device for nuclear power station return circuit sample

Info

Publication number: CN213749245U
Application number: CN202021920434.0U
Authority: CN
Inventors: 龚卫民; 缪正强; 王宇琛; 马柏松; 肖可; 王晨
Original assignee: China Nuclear Power Operation Technology Corp Ltd; Shandong Nuclear Power Co Ltd
Current assignee: China Nuclear Power Operation Technology Corp Ltd; Shandong Nuclear Power Co Ltd
Priority date: 2020-09-04
Filing date: 2020-09-04
Publication date: 2021-07-20
Anticipated expiration: 2030-09-04

Abstract

The invention belongs to the field of machinery, and particularly relates to a sampling device for sampling a primary loop of a nuclear power station. Under the operating condition of the nuclear power station, a certain radioactivity exists in the primary loop liquid, so that the sample is required to be always isolated from personnel in the sampling process. The device comprises a liquid sampling loop, a gas sampling loop, a cleaning loop and a drainage loop; the liquid sampling loop comprises a loop a, b, c and d, the gas sampling loop comprises a loop h and g, the cleaning loop comprises a loop e and f, and the drainage loop comprises an MP01B drainage pump and a waste liquid collecting system. The device can realize the liquid sampling of a loop under the operation condition of the nuclear power plant, and can simultaneously realize the sampling of high-pressure and low-pressure liquids.

Description

A sampling device for nuclear power station return circuit sample

Technical Field

The invention belongs to the field of machinery, and particularly relates to a sampling device for sampling a primary loop of a nuclear power station.

Background

Under the operating condition and the accident condition of the nuclear power station, an operator is required to sample the liquid of a loop and the gas in the containment vessel, and the operating state of the unit is judged by testing the sample. Because a loop of liquid has certain radioactivity, the sample is required to be always isolated from personnel in the sampling process.

The invention mainly aims at the problems and provides a convenient and fast sampling method for primary loop liquid sampling and containment atmospheric sampling of a nuclear power station.

Disclosure of Invention

1. The purpose is as follows:

the invention provides a sampling method for primary loop liquid sampling and containment atmospheric sampling.

The sampling difficulty of a loop is as follows: need to guarantee all can accomplish the sample under power station operating mode and accident condition, and the isolation of sample and personnel need to be guaranteed throughout to the sampling process.

2. The technical scheme is as follows:

a sampling device for a primary circuit sampling of a nuclear power station comprises a liquid sampling loop, a gas sampling loop, a cleaning loop and a drainage loop; the liquid sampling loop comprises a loop a, b, c and d, the gas sampling loop comprises a loop h and g, the cleaning loop comprises a loop e and f, and the drainage loop comprises an MP01B drainage pump and a waste liquid collecting system; the e-f loops are respectively connected with a nuclear power plant system sampling port, and the e and f loops are connected with a nuclear power plant desalting water system; a. the loop b is connected with a sampling source in a power plant power running state; c. and d, two paths of sampling sources are used for high-pressure sampling under the operating condition or low-pressure sampling under the non-operating condition.

The b loop comprises a valve V403B, a valve V406 and a valve V407(T) which are connected in series in sequence through a pipeline.

The loop a is connected with a valve V403A through a pipeline, and the valve V403B of the loop a and the loop b are connected in parallel.

Two ends of the valve V406 of the b loop are connected with a valve V405A (T) in parallel, and the portable instrument is a loop formed by connecting V405B (T) in series; the pipeline between the valve V403B and the valve V406 is connected in parallel with the loop formed by the valve V412, the pressure gauge PI401A and the valve V414 which are connected in series.

The loop d is formed by sequentially connecting valves V404B, V421, V426B, V427B, V428B, V409 and V410(T) in series through pipelines; the valve V404B of the loop d is connected with the loop c in parallel, and the loop c is provided with a valve V404A on a pipeline.

The loop d is connected with the pipelines where the valve V422A (T), the valve V422B (T) and the valve V429 are located; two ends of the valve V409 are connected with a valve V408A (T) in parallel, and a portable instrument V408B (T) is connected in series to form a loop; the two ends of the valve V426B and the valve V428B are connected in parallel with a loop formed by connecting the valve V426A, the valve V427A and the valve V428A in series.

The valve V426A, the valve V427A and the valve V428A are connected in series to form a loop, and the two ends of the loop are connected with the loop in parallel with the valve V439.

The loop e is formed by connecting a valve V401 and a valve V402 in series through a pipeline; the f loop is formed by connecting a valve V411 and a valve V431 in series through a pipeline.

The h loop and the g loop are connected in series, and valves V420(T), V433, a flowmeter FI402, an air suction pump MP01C and a valve V418 are sequentially connected in series through pipelines; g is the gas inlet end of the containment.

A water collecting tank is fixedly arranged below the e-f loop, and the side surface and the bottom of the water collecting tank are respectively provided with a liquid level meter LS401 and a liquid level meter LS 402; the bottom of the water collecting tank comprises two loops, one loop is formed by connecting a liquid level meter LS401 and a valve V435 in series through a pipeline, and the other loop is formed by connecting a drainage pump MP01B, a valve V413 and a valve V436(T) in series through a pipeline; the two loops are connected in parallel.

3. The effect is as follows:

(1) the method can realize the liquid sampling of the primary circuit under the operation condition of the nuclear power plant, and can simultaneously realize the sampling of high-pressure and low-pressure liquids.

(2) The method can realize the liquid sampling of the loop under the non-operation working condition of the nuclear power plant;

(3) the method can realize gas sampling of the atmosphere of the containment vessel of the nuclear power plant;

(4) the method can realize the on-line measurement of the dissolved hydrogen and the dissolved oxygen of the primary circuit liquid of the nuclear power plant;

(5) the method can realize the on-line measurement of the portable instrument of the primary loop liquid in the power plant.

Drawings

FIG. 1 is a schematic diagram of a sampling loop

Detailed Description

The sampling loop consists of a liquid sampling loop, a gas sampling loop, a cleaning loop and a drainage loop.

The sample return circuit that this scheme relates to needs to seal in the sample glove box, and operating personnel utilizes the gloves on the glove box to operate the return circuit.

And e-f interfaces of the sampling loop are respectively connected with sampling ports of the nuclear power plant system.

Wherein the e and f loops are connected with a desalting water system of a nuclear power plant. The e loop is used for cleaning the inside and the outside of the sampling bottle and the inside of the glove box. The f loop is used for driving the liquid sampling ejector.

a. And b, the two paths are used for sampling when the power of the power plant operates, the pressure of a sampling source is higher at the moment, and the sampling source liquid enters the a/b loop after the sampling pressure is adjusted by a pressure reducing valve in an upstream system of the loop. The on-off of the loop can be controlled by V403A/V403B, and the flow can be controlled by V407 (T). The loop liquid enters a sampling bottle through a port behind V407(T) to finish sampling, or is connected with a portable meter through quick ports behind V405A (T) and V405B (T) to carry out online detection. The a/b loop can also lead the liquid to an external dissolved hydrogen meter and dissolved oxygen meter through an interface behind V415(T), and the liquid of the a/b loop is measured on line by dissolved hydrogen and dissolved oxygen.

c. And the two paths are used for high-pressure sampling under the operating condition or low-pressure sampling under the non-operating condition.

The pressure of the sampling source can be judged through the PI 404.

When the c loop and the d loop are used for high-pressure sampling under the operating condition, the pressure of the sampling source is higher, a pressure reducing device is not arranged at the upstream of the c loop and the d loop to reduce the pressure of the liquid, and the high-pressure liquid of the sampling source directly enters the c loop and the d loop. The on-off of the loop can be controlled by V404A/V404B. When a high-pressure sample needs to be taken, liquid enters the sampling bottle through the V422A (T) and flows out of the V422B (T), and then flows out of a joint behind the V410(T) to a water collecting tank through the decompression of the V427A/V427B, so that high-pressure continuous flow sampling is realized. When the sample is required to be taken after decompression, the liquid passes through V404A/B, V421, V426A/B, is decompressed through V427A/B, and finally enters a low-pressure sampling bottle through V410(T), so that the sampling is completed.

When the c and d loops are used for low-pressure sampling under the non-operation working condition, the sampling source pressure is lower. When the pipeline is at low pressure but the internal liquid can naturally flow out: the liquid can enter the sampling bottle through V404A/B, V421, V439, V409 and V410(T) to finish sampling. When the pipeline is at low pressure but the internal liquid cannot naturally flow out, sampling is carried out by means of an ejector. The demineralized water upstream of the f loop enters the sampling ejector through the V411 and the one-way valve V431, a telltale fluid is formed in the ejector, so that a negative pressure is generated downstream of the V425(T), and the liquid to be sampled is pumped out of the c/d loop and enters a sampling bottle through an outlet port of the sampling ejector.

g. And h, two paths are gas sampling loops, g is a containment gas inlet end, containment gas is pumped into the glove box through an air pump, and a corresponding valve in the loop is operated, so that a gas sample can be collected into the sampling bottle.

In the sampling process, the generated waste liquid is collected by the water collecting tank and is discharged to a waste liquid collecting system on site by the drainage pump. The linkage of the drainage pump and the liquid level meters LS401 and LS402 is utilized, the water level of the water collecting tank can be controlled between the two liquid level meters, and a certain water seal is always ensured in the water collecting tank.

Claims

1. A sampling device for nuclear power station primary circuit sample which characterized in that: comprises a liquid sampling loop, a gas sampling loop, a cleaning loop and a drainage loop; the liquid sampling loop comprises a loop a, b, c and d, the gas sampling loop comprises a loop h and g, the cleaning loop comprises a loop e and f, and the drainage loop comprises an MP01B drainage pump and a waste liquid collecting system; the e-f loops are respectively connected with a nuclear power plant system sampling port, and the e and f loops are connected with a nuclear power plant desalting water system; a. the loop b is connected with a sampling source in a power plant power running state; c. and d, two paths of sampling sources are used for high-pressure sampling under the operating condition or low-pressure sampling under the non-operating condition.

2. A sampling device for a primary loop sampling in a nuclear power plant as defined in claim 1, wherein: the b loop comprises a valve V403B, a valve V406 and a valve V407(T) which are connected in series in sequence through a pipeline.

3. A sampling device for a primary loop sampling in a nuclear power plant as defined in claim 1, wherein: the loop a is connected with a valve V403A through a pipeline, and the valve V403B of the loop a and the loop b are connected in parallel.

4. A sampling device for a primary loop sampling in a nuclear power plant as defined in claim 2, wherein: two ends of the valve V406 of the b loop are connected with a valve V405A (T) in parallel, and the portable instrument is a loop formed by connecting V405B (T) in series; the pipeline between the valve V403B and the valve V406 is connected in parallel with the loop formed by the valve V412, the pressure gauge PI401A and the valve V414 which are connected in series.

5. A sampling device for a primary loop sampling in a nuclear power plant as defined in claim 1, wherein: the loop d is formed by sequentially connecting valves V404B, V421, V426B, V427B, V428B, V409 and V410(T) in series through pipelines; the valve V404B of the loop d is connected with the loop c in parallel, and the loop c is provided with a valve V404A on a pipeline.

6. A sampling device for a primary loop sampling in a nuclear power plant as defined in claim 5, wherein: the loop d is connected with the pipelines where the valve V422A (T), the valve V422B (T) and the valve V429 are located; two ends of the valve V409 are connected with a valve V408A (T) in parallel, and a portable instrument V408B (T) is connected in series to form a loop; the two ends of the valve V426B and the valve V428B are connected in parallel with a loop formed by connecting the valve V426A, the valve V427A and the valve V428A in series.

7. A sampling device for a primary loop sampling in a nuclear power plant as defined in claim 6, wherein: the valve V426A, the valve V427A and the valve V428A are connected in series to form a loop, and the two ends of the loop are connected with the loop in parallel with the valve V439.

8. A sampling device for a primary loop sampling in a nuclear power plant as defined in claim 1, wherein: the loop e is formed by connecting a valve V401 and a valve V402 in series through a pipeline; the f loop is formed by connecting a valve V411 and a valve V431 in series through a pipeline.

9. A sampling device for a primary loop sampling in a nuclear power plant as defined in claim 1, wherein: the h loop and the g loop are connected in series, and valves V420(T), V433, a flowmeter FI402, an air suction pump MP01C and a valve V418 are sequentially connected in series through pipelines; g is the gas inlet end of the containment.

10. A sampling device for a primary loop sampling in a nuclear power plant as defined in claim 1, wherein: a water collecting tank is fixedly arranged below the e-f loop, and the side surface and the bottom of the water collecting tank are respectively provided with a liquid level meter LS401 and a liquid level meter LS 402; the bottom of the water collecting tank comprises two loops, one loop is formed by connecting a liquid level meter LS401 and a valve V435 in series through a pipeline, and the other loop is formed by connecting a drainage pump MP01B, a valve V413 and a valve V436(T) in series through a pipeline; the two loops are connected in parallel.