CN211062475U - A pressure monitoring and regulating device for electrical penetrations in nuclear power plants - Google Patents

Abstract

A pressure monitoring and regulating device for electrical penetrations in nuclear power plants. The pressure monitoring and regulating device includes a connecting pipeline, a pressure regulating valve, a protection device, a high-precision pressure gauge, and a gas storage tank; the connecting pipeline includes a plurality of pressure outlet ends and a pressure inlet end, each of which It is used to connect with an instrument joint of the electrical penetration piece, and the pressure inlet end is communicated with the pressure regulating valve; the pressure regulating valve is communicated with the protection device; the protection device is communicated with the gas storage tank; in the gas storage tank Filled with nitrogen; the high-precision pressure gauge is installed between the protection device and the gas storage tank. The pressure regulating valve uses differential pressure to automatically supply gas to the electrical penetrations whose internal pressure is less than the specified value. At the same time, the pressure gauge configured on the pressure regulating valve to monitor the downstream gas pressure can unify the internal pressures of multiple electrical penetrations. Monitoring, which greatly saves labor costs and time costs, and reduces industrial safety risks.

Description

A pressure monitoring and regulating device for electrical penetrations in nuclear power plants

technical field

The utility model relates to the technical field of nuclear power plant safety, in particular to the technical field of nuclear power plant containment safety technology, and more particularly, to a pressure monitoring and adjustment device for electrical penetrations of nuclear power plants.

Background technique

There are a large number (usually 79) electrical penetrations (including medium-voltage electrical penetrations, low-voltage electrical penetrations, low-voltage control and low-voltage instrumentation penetrations) on the reactor containment structure of a nuclear power plant, each of which contains a The sealing cylinder and the insulating mandrel wrapped in it. During normal operation, the sealing cylinder is filled with nitrogen gas, and the internal pressure is maintained within the specified pressure range. In this way, on the one hand, the insulation of the insulating mandrel is guaranteed, and on the other hand, the The leakage inside and outside the containment and in the transition cavity of the sealed cylinder is within the allowable range.

At present, the method used to ensure that the internal pressure of these electrical penetrations meets the requirements is usually to set a pressure gauge with a precision of 1.0 on the side of each electrical penetration that is close to the outer wall of the containment to monitor the corresponding electrical When it is found that the internal pressure of a certain electrical penetration is less than the specified value, the pressure in the sealed cylinder of the penetration needs to be manually supplemented with nitrogen. The disadvantages of the existing methods are: 1) It takes a lot of manpower and time to perform frequent pressure tracking on the 79 electrical penetrations and nitrogen supply for penetrations whose internal pressure is less than a specified value; 2) Since the electrical penetrations are basically Installed in a narrow space, the operation of manual nitrogen supplementation has industrial safety risks such as operator suffocation; 3) The accuracy of the pressure monitoring instruments is low, and the 79 online instruments are not calibrated, so the accuracy is poor.

Utility model content

The technical problem to be solved by the present invention is to provide a pressure monitoring and adjustment device for electrical penetrations in nuclear power plants, which can monitor the internal pressure of a plurality of electrical penetrations in view of the above problems in the prior art. Unified monitoring, and the use of differential pressure to automatically supply air to electrical penetrations whose internal pressure is less than the specified value, thus greatly saving labor costs and time costs, and reducing industrial safety risks.

In order to solve the above technical problems, the technical solution adopted by the present utility model is to provide a pressure monitoring and adjustment device for electrical penetrations of nuclear power plants, the pressure monitoring and adjustment device includes a connecting pipeline, a pressure regulating valve, a protection device , a high-precision pressure gauge, and a gas storage tank; the connecting pipeline includes a plurality of pressure outlet ends and a pressure inlet end communicated with the plurality of the pressure outlet ends, and each of the pressure outlet ends is used for connecting with one of the pressure outlet ends. connected at the instrument joint of the electrical penetration piece, the pressure inlet end is communicated with the air outlet of the pressure regulating valve; the air inlet of the pressure regulating valve is communicated with the air outlet of the air storage tank; the air storage tank The inside is filled with nitrogen; the high-precision pressure gauge is installed at the gas outlet end of the gas storage tank for measuring the air pressure in the gas storage tank.

In the pressure monitoring and regulating device for the electrical penetration of a nuclear power plant provided by the present invention, the pressure monitoring and regulating device further includes a protection device installed between the pressure regulating valve and the gas storage tank. The air outlet and the air inlet of the protection device are respectively communicated with the air inlet of the pressure regulating valve and the air outlet of the air storage tank.

In the pressure monitoring and regulating device for the electrical penetration of a nuclear power plant provided by the present invention, the protection device includes a pressure reducing valve and/or a check valve.

In the pressure monitoring and regulation device for the electrical penetration of a nuclear power plant provided by the present invention, the number of the pressure outlet ends included in the connecting pipeline is 79.

In the pressure monitoring and adjustment device for the electrical penetration of a nuclear power plant provided by the present invention, the connecting pipe is composed of a plurality of pressure-inducing pipes.

In the pressure monitoring and adjustment device for the electrical penetration of a nuclear power plant provided by the present invention, the pressure-inducing pipeline is a Swagelok FM series rigid hose.

In the pressure monitoring and regulating device for the electrical penetration of a nuclear power plant provided by the present invention, the pressure regulating valve is a self-operated pressure regulating valve.

In the pressure monitoring and regulating device for the electrical penetration of a nuclear power plant provided by the present invention, the accuracy of the pressure gauge of the pressure regulating valve is higher than 1.0.

By implementing the pressure monitoring and regulating device for the electrical penetration of a nuclear power plant provided by the present invention, at least the following beneficial effects can be achieved: the pressure monitoring and regulating device includes a connecting pipeline, a pressure regulating valve, a protection device, and a high-precision pressure gauge , and a gas storage tank; the connecting pipeline includes a plurality of pressure outlet ends and a pressure inlet end communicated with the plurality of the pressure outlet ends, each of the pressure outlet ends is used for connecting with one of the electrical through-pieces connected at the instrument joint, the pressure inlet end is communicated with the air outlet of the pressure regulating valve; the air inlet of the pressure regulating valve is communicated with the air outlet of the protection device; the air inlet of the protection device is communicated with the storage The gas tank is connected; the gas storage tank is filled with nitrogen; the high-precision pressure gauge is installed between the protection device and the gas storage tank. It can monitor the internal pressure of multiple electrical penetrations uniformly, and use differential pressure to automatically supply air to electrical penetrations whose internal pressure is less than the specified value, thus greatly saving labor costs and time costs, and reducing industrial safety. risk.

Description of drawings

FIG. 1 is a reference diagram of the use state of the pressure monitoring and adjustment device according to the preferred embodiment of the present invention.

Description of the reference numerals for the specific embodiments:

Connect the pipeline 1 Pressure regulating valve 2 protective device 3 High precision pressure gauge 4 gas tank 5 first pressure line 11 Electrical Penetrations 6 The second impulse line 12

Detailed ways

In order to have a clearer understanding of the technical features, purposes and effects of the present invention, the specific embodiments of the present invention will now be described in detail with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present invention.

As shown in FIG. 1 , the present invention is a preferred embodiment of the pressure monitoring and adjustment device for the electrical penetration part 6 of a nuclear power plant.

First of all, it should be emphasized that the pressure monitoring and adjustment device is mainly designed for the third barrier of nuclear power plant containment, namely, the completion monitoring of the containment, and is generally applicable to cable penetrations (ie electrical penetrations) of nuclear power plants at home and abroad. Item 6) Pressure monitoring system.

The pressure monitoring and regulating device includes a connecting pipeline 1, a pressure regulating valve 2, a protection device 3, a high-precision pressure gauge 4, and a gas storage tank 5; the connecting pipeline 1 includes a plurality of pressure outlet ends and one and more There are two pressure inlet ports that communicate with the pressure outlet ports, each of the pressure outlet ports is used to connect with an instrument connector of the electrical penetration piece 6 , and the pressure inlet port is connected to the air outlet of the pressure regulating valve 2 . The air inlet of the pressure regulating valve 2 is communicated with the air outlet of the protection device 3; the air inlet of the protection device 3 is communicated with the gas storage tank 5; the gas storage tank 5 is filled with nitrogen; The high-precision pressure gauge 4 is installed between the protection device 3 and the gas storage tank 5 .

In this embodiment, the gas storage tank 5 is a fixed nitrogen gas storage tank 5, which is filled with nitrogen gas. The gas storage tank 5 needs to be fixed in a position or area that is easily accessible by operators, so as to facilitate regular inspection and maintain.

In this embodiment, the number of the pressure outlet ends included in the connecting pipeline 1 is 79. Because there are a large number of electrical penetrations 6 in the reactor containment structure of a nuclear power plant, the number is usually 79. Of course, those skilled in the art can select and determine the number of the pressure outlet ends of the connecting pipeline 1 according to the actual situation.

In this embodiment, the connecting pipeline 1 is composed of a plurality of pressure-inducing pipelines. Specifically, it includes 79 first pressure-inducing pipelines 11 whose ends are respectively connected with the instrument joints of 79 of the electrical penetrations 6 , and a second pressure-inducing pipeline 11 connected with the 79 first pressure-inducing pipelines 11 at the same time. In the pipeline 12 , one end of the second pressure-inducing pipeline 12 is communicated with the air outlet of the pressure regulating valve 2 .

In this embodiment, the pressure-inducing pipeline is a Swagelok FM series rigid hose.

In this embodiment, the pressure regulating valve 2 is a self-operated pressure regulating valve, and the accuracy of the pressure gauge on the pressure regulating valve 2 is higher than 1.0. Specifically, the self-operated pressure regulating valve adopts the ZZY self-operated pressure regulating valve of Zhejiang Sanfang Control Valve Co., Ltd., which does not require an external power supply, and uses the energy of the adjusted medium itself as the power source to introduce the actuator control valve. The position of the core changes the flow area and the pressure difference between the two ends, so that the pressure after the valve is stabilized at a given value. The pressure regulating valve 2 and the pressure-inducing pipeline can be connected by welding or flange connection.

In this embodiment, the precision of the high-precision pressure gauge 4 is 0.1%.

In this embodiment, the protection device 3 is a pressure reducing valve. When the pressure in the gas storage tank 5 is too high and exceeds the control range of the pressure regulating valve 2, the protection device 3 can pre-decompress the pressure in the gas storage tank 5, so as to reduce the pressure in the gas storage tank 5. The pressure regulating valve 2 and the entire pressure monitoring and regulating device form a protective effect. Of course, in other embodiments, the protection device 3 may further include a check valve, so that the protection device 3 can also play a role in preventing the reverse flow of nitrogen gas in the connection pipeline 1 .

When using the pressure monitoring and regulating device, first connect the 79 pressure outlet ends of the connecting pipeline 1 with the 79 electrical penetrations 6 on the reactor containment structure of the nuclear power plant, and then Use the pressure regulating valve 2 to adjust the nitrogen pressure in the gas storage tank 5 to the set value pressure. In this way, as long as the reading of the pressure gauge on the pressure regulating valve 2 is regularly observed, and the gas storage tank 5 is regularly inspected and maintained according to the reading of the high-precision pressure gauge 4, the operation of a single unit can be guaranteed. The internal pressure of the electrical penetrations 6 described in block 79 meets the requirements of the supervision program. In addition, the pressure regulating valve 2 can automatically replenish air according to the difference between the pressure drop of the internal pressure of the electrical penetration piece 6 connected to it and the set value, and after the air replenishment pressure reaches the set value, The valve closes on its own to stop air supply.

It has been proved by actual inspection that by using the pressure monitoring and adjustment device provided in this embodiment: the sealing of the electrical penetrations 6 is regularly tested every quarter and during every fuel cycle, which can save 1.5 hours of working time each time; It is completely replaced by an automatic air supply device; it is conservatively estimated that the time spent on reading the electrical penetrations 6 during the containment pressure test can save 1 hour. In a word, by using the pressure monitoring and adjustment device provided in this embodiment, the safety and economy of monitoring and maintenance of the electrical penetrations 6 on the reactor containment structure of the nuclear power plant can be greatly improved.

Implementing the pressure monitoring and regulating device provided by the present utility model has the following beneficial effects:

1. The pressure monitoring and adjustment device can monitor the internal pressure of multiple electrical penetrations 6 uniformly. During the containment pressure test, it is not necessary to read the pressure gauges of multiple electrical penetrations 6 one by one. The value of the pressure regulating valve 2 can be taken, which saves a lot of time.

2. The pressure monitoring and adjustment device uses the differential pressure to automatically supply air to the electrical penetrations 6 whose internal pressure is less than the specified value through the pressure regulating valve 2, thereby greatly saving labor costs and time costs and reducing industrial costs. Security Risk.

3. The gas storage tank 5 can be fixed in a position or area that is easily accessible by the operator, reducing the operation in a narrow space, avoiding the risk of stamping on the finished product, personnel bumping and suffocation, and reducing the industrial safety risk.

The embodiments of the present utility model have been described above in conjunction with the accompanying drawings, but the present utility model is not limited to the above-mentioned specific embodiments, which are only illustrative rather than restrictive, and the common technology in the field Under the inspiration of the present utility model, personnel can make many forms without departing from the scope of protection of the present utility model and the claims, which all belong to the protection of the present utility model.

Claims (8)

1. A pressure monitoring and regulating device for an electrical penetration of a nuclear power plant, wherein the pressure monitoring and regulating device comprises a connecting pipeline, a pressure regulating valve, a protection device, a high-precision pressure gauge, and a gas storage tank ; the connecting pipeline includes a plurality of pressure outlet ends and a pressure inlet end communicated with the plurality of the pressure outlet ends, each of the pressure outlet ends is used for connecting with an instrument joint of the electrical penetration piece, The pressure inlet end is communicated with the air outlet of the pressure regulating valve; the air inlet of the pressure regulating valve is communicated with the air outlet of the gas storage tank; the gas storage tank is filled with nitrogen; the high-precision pressure A meter is installed at the air outlet end of the air storage tank for measuring the air pressure in the air storage tank. 2. The pressure monitoring and regulating device for electrical penetrations in nuclear power plants according to claim 1, wherein the pressure monitoring and regulating device further comprises a device installed between the pressure regulating valve and the gas storage tank. A protective device between the protective devices, the air outlet and the air inlet of the protective device are respectively communicated with the air inlet of the pressure regulating valve and the air outlet of the air storage tank. 3 . The pressure monitoring and regulating device for electrical penetrations in nuclear power plants according to claim 2 , wherein the protection device comprises a pressure reducing valve and/or a check valve. 4 . 4 . The pressure monitoring and regulating device for electrical penetrations of nuclear power plants according to claim 1 , wherein the number of the pressure outlet ends included in the connecting pipeline is 79. 5 . 5 . The pressure monitoring and adjustment device for electrical penetrations in nuclear power plants according to claim 1 , wherein the connecting pipeline is composed of a plurality of pressure-inducing pipelines. 6 . 6 . The pressure monitoring and regulating device for electrical penetrations in nuclear power plants according to claim 5 , wherein the pressure-inducing pipeline is a Swagelok FM series rigid hose. 7 . 7 . The pressure monitoring and regulating device for electrical penetrations in nuclear power plants according to claim 1 , wherein the pressure regulating valve is a self-operated pressure regulating valve. 8 . 8 . The pressure monitoring and regulating device for electrical penetrations of nuclear power plants according to claim 1 , wherein the accuracy of the pressure gauge of the pressure regulating valve is higher than 1.0. 9 .

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