JPH087273B2 - Test / cleaning device and test / cleaning method for nuclear power plant piping - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a test / cleaning apparatus and a test / cleaning method for piping of nuclear power generation equipment, and particularly to a main steam system piping and water supply at the time of construction of nuclear power generation equipment. The present invention relates to a pipe testing / cleaning apparatus and method suitable for improving the efficiency of a hydraulic test and cleaning of system piping.

[Prior Art] With reference to FIGS. 3 and 4, a prior art of a water pressure test and a cleaning operation in a main steam system pipe and a water supply system pipe on the reactor pressure vessel side will be described below.

In FIG. 3, a shield wall 13 is installed around the reactor containment vessel 9. This reactor containment vessel 9
A reactor pressure vessel 8 is housed therein, and the reactor pressure vessel 8 is supported by a reactor pressure vessel pedestal 12. The main steam generated in the reactor pressure vessel 8 is guided to the turbine (not shown) from the main steam system pipes 1 and 14 through the main steam system isolation valve 4 and the main steam third isolation valve 5.
The main steam introduced to this turbine is a condenser (not shown)
Are condensed by and become condensed water. This condensate is used for water supply piping
It is introduced into the reactor pressure vessel 8 from the water supply system isolation valve 3 from 15,2. Then, the condensate is pressurized from the recirculation system pipe 10 through the recirculation pump 11, goes from the lower side to the upper side in the reactor pressure vessel 8, and becomes the main steam again to be guided to the main steam system pipe 1. Has become.

Next, with reference to FIG. 4, a conventional technique of the water pressure test of the main steam system pipe 1 and the water supply system pipe 2 will be described.

In the construction work of the nuclear power generation facility, construction of the main steam system pipes 1,14 and water supply system pipes 2,15 on the reactor pressure vessel side proceeded, and a water pressure test was conducted at the time when the nozzles of the reactor pressure vessel 8 were completed. To do. This water pressure test is performed using a closure cap 6 manufactured in the prior art to withstand a specified pressure. This closure cap 6 is attached to the main steam system pipe 1 by 4 pieces and the water supply system pipe 2 by 6 pieces, a total of 10 pieces.

The water supply system pipe 2 can be subjected to a water pressure test at this point, but the main steam system pipe 1 stops the main steam system isolation valve 4,
After attaching the special jig 17, a water pressure test becomes possible.

After these preparations are completed, a hydraulic test is carried out.
The water pressure test consists of a welding inspection pressure resistance test and a pre-use pressure resistance test. Every time this water pressure test is performed, the temperature of the piping must be raised to the specified temperature in order to confirm the minimum operating temperature specified in the Electrical Engineering Regulations of the Japan Electric Association. Therefore, the steam of the house boiler is injected, but the inspection cannot be performed unless the circulation method is properly performed.

When the water pressure test is completed in this way, the next step, which is the preparation for cleaning the pipe, is started.

That is, the cleaning of the pipe is performed by injecting water or a solution in which a chemical is dissolved into the pipe, and in the related art, a circulation loop is formed in the pipe to be cleaned and the solution is circulated. At the time of this cleaning, it is not necessary to consider the pressure of the piping, and the temporary piping only for the cleaning route was used for cleaning.

[Problems to be Solved by the Invention] When performing a hydraulic test and a cleaning operation according to the above-mentioned conventional technique, there are the following problems.

Firstly, there are positional problems of the main steam system piping 1 and the water supply system piping 2 on the reactor pressure vessel side, and timing problems of the hydraulic test and cleaning work of these pipings. That is, when the equipment, pipes, supports, ducts, cable trays for electrical equipment, instrumentation pipes, etc. are brought into and installed in a narrow reactor pressure vessel, the main steam system piping 1 on the reactor pressure vessel side is installed at the peak of the nuclear power plant construction. In the conventional technique in which the water pressure test and the cleaning work are separately repeated for the water supply system pipe 2 and the water supply system pipe 2, a problem occurs in the construction management of the entire nuclear power generation facility.

Secondly, it is difficult to raise the temperature of the pipe to the specified temperature, which is the condition of the water pressure test. That is, the temperature of the pipe is raised to the specified temperature in order to confirm the minimum operating temperature specified in the Electrical Engineering Regulations of the Japan Electric Association. To raise the temperature of this pipe, steam from the house boiler is passed through the pipe. However, the diameter of the piping is large (for example, 26 inches for the main steam system piping and 20 inches for the water supply system piping), and in the prior art, the steam of the house boiler is put in from a branch pipe separated from the main pipe and circulated. . Therefore, it takes a long time of 10 hours or more to circulate the steam. In addition, as mentioned above, the diameter of the pipe is large and the route of the pipe is long, so it is difficult to maintain the temperature at the specified temperature. This improvement is a prerequisite for the construction of.

Thirdly, in the prior art using a closing cap,
It requires a strict design for the production and installation of a closure cap that can be attached to large-diameter pipes, and construction management needs to be careful not to damage the main pipe, and after a water pressure test and cleaning is completed. Similar precautions are required in the restoration work of.

Fourth, due to the number of water pressure tests described above, the required number of days and time are required, and the time margin for the final joint welding of the nozzle of the reactor pressure vessel, which is the main process of the construction of nuclear power generation equipment, is required. Could be confusing.

An object of the present invention is to solve the above-mentioned problems of the prior art, and to perform a water pressure test and cleaning of the main steam system piping and the water supply system piping, which are mounted on the reactor pressure vessel side, with a small number of times and with certainty nuclear power. It is to provide a test / cleaning device for piping of power generation equipment.

Another object of the present invention is to provide a pipe testing / cleaning method capable of efficiently performing a water pressure test and a cleaning work on a main steam system pipe and a water supply system pipe.

[Means for Solving the Problems] In the test / cleaning device for the piping connected to the reactor pressure vessel, all the main steam piping attached to the main steam piping inside the reactor pressure vessel A first connecting pipe jig capable of communicating with the first connecting pipe jig, and a second connecting pipe jig attached to the water supply pipe inside the reactor pressure vessel and capable of connecting with all the water supply pipes; This is achieved by providing a connecting pipe having a sluice valve for connecting the connecting pipe jig.

Further, the above-mentioned object is to use the first and second connecting pipe jigs, connect the first connecting pipe jig to the main steam system pipe, and connect the first connecting pipe jig to the water supply system pipe in the reactor pressure vessel. After connecting the second connecting pipe jig, the first and second connecting pipe jigs are connected by a connecting pipe having a partition valve, and at least one of a pipe test and a cleaning work is performed, To be achieved.

[Operation] During the water pressure test of the main steam system piping and the water supply system piping of the reactor pressure vessel and the subsequent cleaning, the main steam system isolation valve and the main steam third isolation valve are already attached to the main steam system piping. , A water supply system isolation valve is attached to the water supply system pipe.

By the way, in the present invention, at the time of the water pressure test and cleaning of the main steam system pipe and the water supply system pipe, the first connecting pipe jig is attached to the main steam system pipe in the reactor pressure vessel, and the second line is connected to the water supply system pipe. Attach the connecting piping jig.

As a result, the main steam system pipe and the water supply system pipe are connected to the first and second connecting pipe jigs and the connecting pipes by connecting the first and second connecting pipe jigs to each other. It becomes possible to communicate with the provided sluice valve. Also, by closing the sluice valve, it is possible to shut off the main steam system piping side and the water supply system piping side.

Therefore, when performing a water pressure test on the main steam system piping and the water supply system piping at the same time, the main steam third isolation valve provided on each of the plurality of main steam system piping is added. Connect the pressure pump, close the other main steam third isolation valve,
Open all main steam isolation valves, open sluice valves, and close all water supply isolation valves. Then, when water pressure is applied by the pressure pump, all of the main steam system piping and the water supply system piping attached to the reactor pressure vessel are pressurized, so that the main steam system piping and the water supply system piping are simultaneously subjected to the water pressure test. It can be carried out.

Next, when performing a water pressure test on the main steam system piping only,
Close the sluice valve and apply water pressure to the main steam system piping as described above.

There are two methods for conducting a water pressure test on only the water supply system piping.

One of them is to connect a pressurizing pump to one of the main steam third isolation valves and to close the other main steam third isolation valve,
Open only the main steam system isolation valve of the same main steam system piping as the main steam third isolation valve to which the pressurizing pump of the main steam system isolation valve is connected, close the other main steam system isolation valves, and open the sluice valve. open,
All the water supply system isolation valves are closed, water pressure is applied by the pressurizing pump, and when the specified water pressure is reached, the partition valve is closed and a water pressure test of the water supply system piping is performed.

The other one is to connect a pressurizing pump to one of the water supply system isolation valves provided in each of the plurality of water supply system pipes, close the other water supply system isolation valves, close the gate valve, and pressurize. Water pressure is applied by a pump.

In the water pressure test, for confirmation of the minimum operating temperature,
When raising the temperature of the pipe to the specified temperature, connect the house boiler to one of the multiple main steam system pipes and connect the main steam third isolation valve and the main steam system isolation valve of this main steam system pipe. Open, close all other main steam system isolation valves in main steam system piping, open gate valves, close all water supply system isolation valves, send steam from the house boiler, and contact the main steam system to this house boiler. Sends steam to other main steam system piping and water supply system piping through piping. Thereby, the piping can be raised to the specified temperature in an extremely short time.

There are two methods for cleaning the pipe after the completion of the hydraulic test of the pipe.

One of them is to close the sluice valve, open at least one water supply system isolation valve, and supply cleaning water through the water supply system pipe,
When full, open the sluice valve and pass the washing water through the main steam system piping.

The other one is to close the sluice valve and open the main steam third isolation valve and the main steam isolation valve of at least one main steam system pipe,
The cleaning water is supplied from the main steam system pipe, and when it is full, the sluice valve is opened and the cleaning water is passed through the water supply system pipe.

By any of them, all the main steam system pipes and all the water supply system pipes can be cleaned at the same time.

[Embodiment] An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows an embodiment of the present invention, and is a system diagram showing a state in which the first and second connecting pipe jigs are attached to the main steam system pipe and the water supply system pipe, and FIG. It is a partially expanded sectional view which shows an example of a 2nd connection piping jig.

In the embodiment shown in these figures, as shown in FIG.
Inside the reactor pressure vessel 8, a first connecting pipe jig 18 is attached to the main steam system pipe 1, and a second connecting pipe jig 19 is attached to the water supply system pipe 2.

The first connecting pipe jig 18 and the second connecting pipe jig 19 are connected by a connecting pipe 20. This connection pipe 20
A sluice valve 21 is provided in the.

As shown in FIG. 2, the first and second connecting pipe jigs 18 and 19 include a water jacket 22, plugs 23 provided in the same number as the number of pipes, and a pipe from the outside of the water jacket 22. And a push bolt (24) for pushing the plug (23) into it and a nut (25) for this push bolt.

The water jacket 22 faces the tip of the communication pipe 20.

The plug 23 is provided on the water jacket 22 and is attached so as to be retractable in the axial direction of the pipe.

The push bolt 24 pushes the plug 23 into the distal end portion of the pipe via a nut 25 fixed to the outer wall of the water jacket 22 so that the plug 23 is closely fitted.

Then, the first and second connecting pipe jigs 18, 19 shown in FIG.
Then, from the plug 23 attached to the reactor pressure vessel 8 through the water jacket 22 and attached to the pipe represented by reference numeral 26 in FIG. 2 to the connecting pipe 20, and conversely, the connecting pipe 20 to the plug 23. Water, steam, or cleaning water for a water pressure test is made to flow through the pipe 26 via the pipe.

Using the pipe testing / cleaning apparatus of the above-described embodiment, a water pressure test and a cleaning operation for the main steam system piping and the water supply system piping of the reactor pressure vessel are carried out as follows.

During the water pressure test of the main steam system piping 1 and the water supply system piping 2 connected to the reactor pressure vessel 8 and the subsequent cleaning, the main steam system isolation valve 4 and the main steam third isolation are already installed in the main steam system piping 1. A valve 5 is attached, and a water supply system isolation valve 3 is attached to the water supply system pipe 2.

By the way, in the present invention, at the time of the water pressure test and cleaning of the main steam system pipe 1 and the water supply system pipe 2, the first connecting pipe jig 18 is attached to the main steam system pipe 1 in the reactor pressure vessel 8.
A second connecting pipe jig 19 is attached to the water supply pipe 2.

As a result, the main steam system pipe 1 and the water supply system pipe 2 are
The first and second connecting pipe jigs 18 and 19, the connecting pipe 20 connecting the first and second connecting pipe jigs 18 and 19, and the sluice valve 21 provided in the connecting pipe 20. It becomes possible to communicate through and. Further, by closing the sluice valve 21, it becomes possible to shut off the main steam system pipe 1 side and the water supply system pipe 2 side.

Then, the water pressure test and cleaning of the pipes are performed as follows.

(1) When performing a water pressure test on the main steam system pipe 1 and the water supply system pipe 2 at the same time, which one of the main steam third isolation valves 5 is provided for each of the plurality of main steam system pipes 1 A pressure pump (not shown) is connected to one of them, the other main steam third isolation valve 5 is closed, all the main steam system isolation valves 4 are opened, the partition valves 21 are opened, and all the water supply system isolation valves are opened. Close 3. Then, when water pressure is applied by a pressure pump, a main steam system pipe 1 and a water supply system pipe 2 attached to the reactor pressure vessel 8
Is pressurized, so that the main steam system pipe 1 and the water supply system pipe 2 can be simultaneously subjected to the water pressure test.

(2) When conducting a water pressure test on the main steam system piping 1 only,
The sluice valve 21 is closed, and water pressure is applied to the main steam system pipe 1 as described above.

(3) There are two methods for conducting a water pressure test on only the water supply system pipe 2.

(I) A pressurizing pump is connected to any one of the main steam third isolation valves 5, the other main steam third isolating valves 5 are closed, and the pressurizing pump of the main steam system isolation valves 4 is Only the main steam system isolation valve 4 of the same main steam system piping 1 as the connected main steam third isolation valve 5 is opened, the other main steam system isolation valve 4 is closed, and the sluice valve
21 is opened, all the water supply system isolation valves 3 are closed, water pressure is applied by the pressurizing pump, and when the specified water pressure is reached, the sluice valve 21
Is closed and a water pressure test of the water supply system pipe 2 is performed.

(Ii) A pressurizing pump is connected to one of the water supply system isolation valves 3 provided in each of the plurality of water supply system pipes 2, the other water supply system isolation valve 3 is closed, and the sluice valve 21 is closed. Water pressure is applied by a pressure pump.

(4) In the water pressure test of the pipe, in order to confirm the minimum operating temperature, when the temperature of the pipe is raised to the specified temperature, it is performed as follows.

That is, a house boiler (not shown) is connected to one of the plurality of main steam system pipes 1,
Main steam third isolation valve 5 and main steam system isolation valve 4 are opened, all other main steam system isolation valves 4 of main steam system piping 1 are closed, partition valves 21 are opened, and all water supply system isolation valves 3 , The steam is sent from the house boiler to the other main steam system piping 1 and the water supply system piping 2 through the main steam system piping 1 connected thereto, and the steam is heated by the steam. Thereby, the piping can be raised to the specified temperature in an extremely short time.

(5) There are two methods for cleaning the pipe after the completion of the hydraulic test of the pipe.

(I) The sluice valve 21 is closed, at least one water supply isolation valve 3 is opened, washing water is supplied through the water supply system pipe 2, and when the sluice valve 21 is full, the sluice valve 21 is opened and the main steam system pipe 1 is filled with the washing water. Pass water.

(Ii) The sluice valve 21 is closed, the main steam third isolation valve 5 and the main steam isolation valve 4 of at least one main steam system pipe 1 are opened, and cleaning water is supplied from the main steam system pipe 1 to fill up the space. When this happens, the sluice valve 21 is opened, and the washing water is passed through the water supply system pipe 2. Both of the above (i) and (ii) can simultaneously clean all the main steam system pipes 1 and all the water supply system pipes 2.

[Effects of the Invention] According to the apparatus of the present invention described above, in a test / cleaning apparatus for piping connected to a reactor pressure vessel, all main steam attached to the main steam system piping inside the reactor pressure vessel A first connecting pipe jig capable of communicating with the system pipe, and a second connecting pipe jig attached to the water supply system pipe inside the reactor pressure vessel and capable of communicating with all the water supply system pipes; Second
And a connecting valve having a sluice valve for connecting the connecting pipe jig, and a sluice valve provided in the connecting pipe between the first and second connecting pipe jigs and attached to the reactor pressure vessel side. The main steam system isolation valve and the main steam third isolation valve provided in the main steam system pipe, and the water supply system isolation valve provided in the water supply system pipe also attached to the reactor pressure vessel side are operated. By opening and closing according to the purpose, it is possible to perform a water pressure test on all the main steam system piping and all the water supply system piping simultaneously and reliably, and if necessary, separate the main steam system piping and the water supply system piping. It is also possible to conduct a water pressure test on the pipes and to wash the pipes at the same time and reliably after the completion of the water pressure test. As a result, the number of water pressure tests and cleaning operations can be significantly reduced, and even if the water pressure tests and cleaning operations for pipes and the installation of various components in the reactor containment vessel overlap in time, And there is also an effect that the work can be completed satisfactorily.

Further, according to the device of the present invention, the house boiler is connected to the selected main steam system arrangement, the main steam system isolation valves of the other main steam system pipes are closed, the partition valves are opened, and all the water supply system isolation valves are opened. Closed, by sending steam from the house boiler through the main steam system piping in communication with this, all main steam system piping and all the water supply system piping are fed with steam from the house boiler and can be heated by the steam, There is also an effect that the step of raising the temperature of the pipe to the specified temperature in the water pressure test can be carried out in an extremely short time.

Further, according to the method of the present invention, by using the first and second connecting piping jigs, the hydraulic pressure test and cleaning work of the main steam system piping and the water supply system piping connected to the reactor pressure vessel can be performed efficiently. There is an effect that can be done well.

[Brief description of drawings]

FIG. 1 shows an embodiment of the present invention. A system diagram showing a state in which first and second connecting pipe jigs are attached to the main steam system piping side and the water supply system piping side, and FIG. FIG. 3 is a partially enlarged sectional view showing an example of the first and second connecting piping jigs, FIG. 3 is a vertical sectional view of a nuclear power generation facility, and FIG. 4 is a system diagram showing a conventional technique. 1,14 …… Main steam system piping, 2,15 …… Water supply system piping, 3 …… Water supply system isolation valve, 4 …… Main steam system isolation valve, 5 …… Main steam third
Isolation valve, 8 ...... Reactor pressure vessel, 18, 19 ...... 1st and 2nd connecting pipe jig, 20 ...... Connecting pipe, 21 ...... Gate valve.

 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Inventor Yoichi Yamane 3-1-1, Saiwaicho, Hitachi, Ibaraki Hitachi Ltd. Hitachi factory (72) Inventor Shigeshi Sato 3-chome, Hitachi, Hitachi 1-1 No. 1 Hitachi Ltd., Hitachi Works (72) Inventor Misao Ando 2-9-1 Aisemachi, Hitachi City, Ibaraki Hitachi Engineering Service Co., Ltd. (56) Reference JP-A-63-175798 (JP , A) Actual Kaihei 1-84097 (JP, U)

Claims (2)

[Claims] 1. In a test / cleaning device for a pipe connected to a reactor pressure vessel, a first communication which is attached to a main steam system pipe inside a reactor pressure vessel and can communicate with all main steam system pipes. Piping jig and water supply system piping inside the reactor pressure vessel that can be connected to all water supply system piping No. 2
And a connecting pipe having a sluice valve for connecting the first and second connecting pipe jigs to each other. 2. The first and second connecting pipe jigs according to claim 1, wherein the first connecting pipe jig is connected to the main steam system pipe in the reactor pressure vessel, and the water supply system pipe is connected. After connecting the second connecting pipe jig to, connect the first and second connecting pipe jigs with the connecting pipe having a sluice valve, and perform at least one of testing and cleaning of the pipe. A method for testing and cleaning pipes of nuclear power generation equipment characterized by.