CN112113803A - A sampling device for nuclear power station return circuit sample - Google Patents

Abstract

The invention belongs to the field of machinery, and in particular relates to a sampling device for sampling a primary circuit of a nuclear power plant. Due to the presence of radioactivity in the primary circuit liquid under the operating conditions of the nuclear power plant, the samples must always be kept isolated from personnel during the sampling process. The device includes a liquid sampling circuit, a gas sampling circuit, a cleaning circuit and a drainage circuit; the liquid sampling circuit includes a, b, c, and d circuits, the gas sampling circuit includes h, g circuits, the cleaning circuit includes e, f circuits, and the drainage circuit includes MP01B drain pump and waste collection system. The device can realize the liquid sampling of the lower loop of the nuclear power plant operating conditions, and can realize the sampling of high and low pressure liquids at the same time.

Description

A sampling device for sampling the primary circuit of a nuclear power plant

technical field

The invention belongs to the field of machinery, and in particular relates to a sampling device for sampling a primary circuit of a nuclear power plant.

Background technique

Under the operating conditions of nuclear power plants and accident conditions, operators are required to sample the liquid in the primary circuit and the gas in the containment, and determine the operating status of the unit by testing the samples. Due to the radioactivity of the primary liquid, the samples should always be kept isolated from personnel during the sampling process.

The content of the present invention is mainly aimed at the above problems, and a convenient and fast sampling method is proposed for the sampling of the liquid in the primary circuit of the nuclear power plant and the sampling of the atmosphere in the containment.

SUMMARY OF THE INVENTION

1. Purpose:

The invention provides a sampling method for liquid sampling in a primary loop and atmospheric sampling in a containment vessel.

The difficulty of sampling in the primary circuit is that it is necessary to ensure that sampling can be completed under the operating conditions of the power station and accident conditions, and the sampling process must always ensure that the samples are isolated from personnel.

2. Technical solution:

A sampling device for sampling a primary circuit of a nuclear power plant, including a liquid sampling circuit, a gas sampling circuit, a cleaning circuit and a drainage circuit; the liquid sampling circuit includes a, b, c, and d circuits, the gas sampling circuit includes h, g circuits, and the cleaning circuit The loops include e and f loops, and the drainage loop includes MP01B drainage pump and waste liquid collection system; e~f loops are respectively connected to the sampling ports of the nuclear power plant system, e and f are connected to the nuclear power plant desalinated water system; a and b loops are connected to the power operation status of the power plant Sampling source under the operating conditions; c and d are used for high-pressure sampling under operating conditions or low-pressure sampling sources under non-operating conditions.

The b-loop includes valves V403B, V406 and V407(T) which are connected in series through pipelines.

The a-circuit is a pipeline connecting the valve V403A, and the valves V403B of the a-circuit and the b-circuit are connected in parallel.

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

The d loop is the valves V404B, V421, V426B, V427B, V428B, V409, V410(T) which are connected in series through the pipeline in turn; the valve V404B of the d loop is connected in parallel with the c loop, and the c loop is that the pipeline is equipped with a valve V404A.

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

The valve V426A, the valve V427A, and the valve V428A are connected in series to form the circuit at both ends of the circuit where the valve V439 is located in parallel.

The e-loop is that the valve V401 and the valve V402 are connected in series through the pipeline; the f-loop is that the valve V411 and the valve V431 are connected in series through the pipeline.

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

The water collecting tank is fixedly installed below the e-f loop, and the liquid level gauge LS401 and the liquid level gauge LS402 are installed on the side and bottom of the water collecting tank respectively; the bottom of the water collecting tank includes two loops, one is for the liquid level gauge LS401 and the valve V435 to pass through. The pipelines are connected in series, one is the drain pump MP01B, the valve V413, the valve V436(T) are connected in series through the pipeline; the above two circuits are connected in parallel.

3. Effect:

(1) This method can realize the liquid sampling of the lower loop of the nuclear power plant operating conditions, and can realize the sampling of high and low pressure liquids at the same time.

(2) This method can realize liquid sampling in the lower loop of the nuclear power plant under non-operational conditions;

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

(4) This method can realize the on-line measurement of dissolved hydrogen and dissolved oxygen in 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 circuit liquid of the power plant.

Description of drawings

Figure 1 Schematic diagram of sampling circuit

Detailed ways

The sampling circuit involved in the present invention is composed of a liquid sampling circuit, a gas sampling circuit, a cleaning circuit and a drainage circuit.

The sampling loop involved in this solution needs to be enclosed in the sampling glove box, and the operator uses the gloves on the glove box to operate the loop.

The interfaces e to f of the sampling loop are respectively connected to the sampling ports of the nuclear power plant system.

Among them, the e and f loops are connected to the demineralized water system of the nuclear power plant. The e-loop is used to clean the inside and outside of the sampling bottle and the inside of the glove box. The f circuit is used to drive the liquid sampling injector.

The two circuits a and b are used for sampling during power operation of the power plant. At this time, the pressure of the sampling source is relatively high, and the liquid of the sampling source enters the a/b circuit after adjusting the sampling pressure through the pressure reducing valve in the upstream system of this circuit. The circuit on-off can be controlled by V403A/V403B, and the flow can be controlled by V407(T). The loop liquid enters the sampling bottle through the interface after V407(T) to complete the sampling, or connects with the portable instrument through the quick interface after V405A(T) and V405B(T) for online detection. The a/b loop can also drain the liquid to the external dissolved hydrogen meter and dissolved oxygen meter through the interface after the V415(T), and perform on-line measurement of dissolved hydrogen and dissolved oxygen for the liquid in the a/b loop.

The two circuits c and d are used for high-pressure sampling under operating conditions or low-pressure sampling under non-operational conditions.

The pressure of the sampling source can be judged by PI404.

When the circuits c and d are used for high-pressure sampling under operating conditions, the pressure of the sampling source is high and there is no decompression device upstream of the circuit to decompress the liquid, and the high-pressure liquid of the sampling source directly enters the circuits c and d. Loop on and off can be controlled by V404A/V404B. When a high-pressure sample needs to be taken, the liquid enters the sampling bottle through V422A(T) and flows out from V422B(T), and then flows out from the interface behind V410(T) through the decompression of V427A/V427B to the sump, thus realizing high-pressure continuous Stream sampling. When it is necessary to take a decompressed sample, the liquid passes through V404A/B, V421, V426A/B, decompressed by V427A/B, and finally enters the low-pressure sampling bottle through V410(T) to complete the sampling.

When the c and d loops are used for low-pressure sampling under non-operational conditions, the sampling source pressure is lower at this time. When the pipeline is at low pressure but the internal liquid can flow out naturally: the liquid can enter the sampling bottle through V404A/B, V421, V439, V409, V410(T) to complete the sampling. When the pipeline is at low pressure but the internal liquid cannot flow out naturally, it is necessary to use an ejector for sampling. The desalinated water upstream of the f loop enters the sampling injector through V411 and the one-way valve V431, and forms a telling fluid in the injector, thereby generating negative pressure downstream of V425 (T), and extracting the liquid to be sampled from the c/d loop. The outlet port of the sampling injector enters the sampling bottle.

The two circuits g and h are the gas sampling circuit, and g is the gas inlet end of the containment. The gas of the containment is pumped into the glove box by the air pump, and the gas sample can be collected into the sampling bottle by operating the corresponding valve in the circuit.

During the sampling process, the generated waste liquid is collected by the water collecting tank and discharged to the waste liquid collection system on site by the drainage pump. Using the linkage between the drain pump and the liquid level gauges LS401 and LS402, the water level of the sump can be controlled between the two level gauges, so as to ensure that the sump always has a certain water seal.

Claims (10)

1. A sampling device for primary loop sampling in nuclear power plants, characterized in that: comprising a liquid sampling circuit, a gas sampling circuit, a cleaning circuit and a drainage circuit; the liquid sampling circuit includes a, b, c, and d circuits, and the gas sampling circuit includes h, g loops, the cleaning loop includes e, f loops, the drainage loop includes MP01B drainage pump and waste liquid collection system; e~f loops are respectively connected to the sampling ports of the nuclear power plant system, e and f are connected to the nuclear power plant desalination system; a, b The loop is connected to the sampling source under the power operation state of the power plant; the two circuits c and d are used for high-pressure sampling under operating conditions or low-pressure sampling sources under non-operational conditions. 2 . The sampling device for sampling the primary loop of a nuclear power plant according to claim 1 , wherein the b loop comprises a valve V403B, and V406 and V407 (T) are connected in series through pipelines. 3 . 3 . The sampling device for sampling the primary loop of a nuclear power plant according to claim 1 , wherein the a loop is a pipeline connecting valve V403A, and the valves V403B of the a loop and the b loop are connected in parallel. 4 . 4. a kind of sampling device for the sampling of the primary circuit of nuclear power plant according to claim 2, is characterized in that: valve V405A (T) in parallel at both ends of valve V406 of described b circuit, portable instrument, V405B (T) series connection The circuit formed; the pipeline between the valve V403B and the valve V406 connects the valve V412 in parallel, and the pressure gauge PI401A and the valve V414 are connected in series to form a circuit. 5. A kind of sampling device for sampling the primary circuit of nuclear power plant according to claim 1, it is characterized in that: described d circuit is valve V404B, V421, V426B, V427B, V428B, V409, V410 (T) pass through pipeline Connect in series in sequence; the valve V404B of the d loop is connected in parallel with the c loop, and the c loop is equipped with a valve V404A on the pipeline. 6. a kind of sampling device for nuclear power plant primary loop sampling according to claim 5, is characterized in that: described d loop is connected with valve V422A (T), valve V422B (T), the pipeline where valve V429 is located; Both ends of valve V409 are connected in parallel with valve V408A(T), portable instrument, V408B(T) is connected in series to form a circuit; valve V426B and valve V428B are connected in parallel at both ends of valve V426A, valve V427A, valve V428A is connected in series to form a circuit. 7. A kind of sampling device for sampling the primary circuit of nuclear power plant according to claim 6, is characterized in that: described valve V426A, valve V427A, valve V428A are connected in series to form the loop both ends of the loop where valve V439 is connected in parallel. 8. a kind of sampling device for the sampling of primary loop of nuclear power plant according to claim 1 is characterized in that: described e loop is that valve V401 and valve V402 are connected in series by pipeline; described f loop is valve V411 and valve V402. Valve V431 is connected in series by piping. 9. A kind of sampling device for sampling the primary loop of nuclear power plant according to claim 1, it is characterized in that: described h loop and g loop are connected in series, valve V420 (T), V433, flow meter FI402, air pump MP01C, valves V418 are connected in series through pipelines; g is the gas inlet port of the containment. 10 . The sampling device for sampling the primary circuit of a nuclear power plant according to claim 1 , wherein a water collecting tank is fixedly installed under the e-f circuit, and a liquid level gauge is installed on the side and bottom of the water collecting tank. 11 . LS401 and level gauge LS402; the bottom of the sump includes two circuits, one is the level gauge LS401 and the valve V435 connected in series through the pipeline, the other is the drain pump MP01B, the valve V413, the valve V436(T) is connected in series through the pipeline; the above two The loops are connected in parallel.

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