JPS5842920Y2 - Container pressure test equipment - Google Patents

Description

[Detailed description of the invention] In a fast breeder reactor that uses liquid metal sodium as a coolant, as shown in Fig. 1, a large reactor vessel a is firmly attached to a guard vessel b with a predetermined gap. It was fitted and sealed with the same guard vessel b.

Several keys C (hereinafter referred to as radial keys) for earthquake stabilization are provided at predetermined intervals along the circumferential direction of the lower part of the guard vessel b, and the guard vessel A drain nozzle d was provided to drain water and foreign matter accumulated in the tank b.

To install such a fast breeder reactor, as shown in FIG. 2, the upper opening e of guard vessel b, the opening f of radial key C, and the drain nozzle d are temporarily blinded, and After carrying out the pressure leakage test, as shown in Fig. 3, the temporary blind is removed, the reactor vessel a is carried from above into the guard vessel b, and installed, and the adjustment of the radial key C is guarded during this installation. This is done from the outside of the vessel b through the opening f of the radial key C, and then the blind cover g is welded and fixed to the inside of the opening f as shown in FIG. A blind lid i with an inspection hole is fixed by welding to J, a radiation source for radiation testing (not shown) is inserted through the inspection hole, the weld is inspected, and then pressure is applied through the inspection hole to fix the blind lids g, i and the weld. A pressure resistance and leakage test is performed on parts and parts J to confirm their soundness, a blind cap T is welded and fixed to the inspection hole k, and a radiographic inspection is performed on the welded part m to see through the welded part m from the outside. was.

After the installation of the reactor vessel a is completed, a blind cover is also fixed to the drain nozzle d of the guard vessel b in the same manner as described above.

When such a fast speed booster reactor enters plant operation, stress due to internal pressure and thermal expansion occurs in guard vessel b, which is exposed to high temperature and pressure. Although it is preferable to seal the guard vessel b with blind lid i rather than sealing guard vessel b with blind lid g, after sealing blind lid i and blind cap t, a pressure resistance test of this part was performed. Since it was virtually impossible to do so, the guard vessel b was sealed with a blind lid g, and in order to improve reliability, the blind lid i and the blind cap t were sealed.

However, in such a sealed structure, when the plant starts operating, the waste in the space n surrounded by the blind caps g, i and the blind caps t is heated significantly and its pressure becomes extremely high. and blind caps t, resulting in abnormally high stresses, so that they had to be reinforced unnecessarily.

Furthermore, since it was not possible to perform a pressure leakage test on the welded part m of the blind cap t, reliability was lacking when the pressure was increased.

The present invention relates to a device that overcomes these difficulties, and includes a casing that is fitted into a through hole in a partition plate provided at the entrance of the container, a central member that is surrounded by the casing and forms a pressure fluid injection hole, and the through hole. a sealing member interposed between the inner surface of the central member and the casing, a locking device for fixing the casing in the through hole, a fluid actuation device for remotely controlling the locking device, and a sealing member disposed in the injection hole of the central member. It is characterized by having a pressurized fluid generator connected through a flexible conduit, and its intended purpose is to be installed in such a way that it will not be affected by temperature rise during operation. The object of the present invention is to provide a testing device that can extremely easily perform a pressure leakage test on a blind lid portion that has been closed.

In this case, as described above, a pressurized fluid injection hole is formed in the central member so as to be surrounded by the casing that is fitted into the through hole of the partition plate provided at the center of the container, and between the inner surface of the through hole and the casing. a sealing member interposed in the central member, a locking device for fixing the casing in the through hole, a fluid operating device for remotely controlling the locking device, and a flexible conduit connected to the injection hole in the central member. Since the pressure fluid generator is connected to the container, the casing is previously fitted into the through hole from the inside of the container and fixed to the through hole with the locking device, and a blind lid is welded to the entrance of the container to seal it. Thereafter, a pressure leakage test can be performed by injecting high-pressure fluid from the pressure fluid generator through the flexible conduit into the sealed space surrounded by the container partition plate and the blind lid.

In addition, in this proposal, after conducting the pressure leakage test,
by restoring the locking device to an inoperative state;
The casing can be removed from the penetration hole very easily.

As described above, according to the present invention, it is possible to reliably fix the blind lid of the most preferable shape to the entrance of the container against the stress generated by the pressure inside the container and the high heat received from the sealed fluid, and in addition, it is possible to securely fix the blind lid to the inlet of the container. The pressure leakage test can be carried out faithfully, and the pressure resistance reliability of the container can be significantly improved.

The present invention will be described below with reference to the embodiment shown in FIGS. 5 to 7. Reference numeral 1 denotes a wall side portion of a guard vessel, and a large diameter radial key nozzle 2 is protruded from the wall side portion 1 of the guard vessel.

Reference numeral 3 denotes a double blind plate for pressure leakage testing, and a through hole 4 is formed in the center of the blind plate 3, into which a casing 12 of a pressure testing device 11, which will be explained in detail later, is fitted into the through hole 4. It is now equipped.

Therefore, the pressure test device casing 1 is inserted into the through hole 4.
2 is fitted, the outer periphery of the double blind plate 3 for pressure leakage test is welded 5 to the inner peripheral surface of the radial key nozzle 2.
After that, the outer peripheral edge of the cap 6 is welded 7 to the edge of the radial key nozzle 2, the inspection cap 9 is welded 10 to the inspection opening 8 of the cap 6, and these welded parts 5, 7, and 10 are welded in the same way as before. Radiological examinations can be performed.

Further, the casing 12 of the pressure test device 11 is configured such that a central member 14 forming a pressure fluid injection hole 13 is surrounded by the casing 12, and a lock cylinder chamber formed by the casing 12 and the central member 14. A piston 16 is fitted into the casing 15, and balls 18 are fitted into through holes 17 at predetermined intervals in the circumferential direction of the casing 12. When the piston 16 is pushed out, the piston wedge surface 1
At 9, the pole 18 is projected in the radial direction.

Further, three drawing cylinder chambers 20 are formed in the casing 12 at equal intervals in the circumferential direction, and a drawing piston 21 is fitted into the cylinder chambers 20.

Furthermore, a lock pressure flexible tube 23 is connected to the lock cylinder chamber 15 via a lock pressure die 22, and a pull pressure flexible tube 26 is connected to the unlock cylinder chamber 24 and the pull cylinder chamber 20 via a pull hole 25. has been done.

Further, a seal packing 27 is attached to the outer periphery of the casing 12, and seal packings 28 and 29 are interposed in the lock cylinder chamber 15, unlock cylinder chamber 24, and piston 16, and in the withdrawal cylinder chamber 20 and withdrawal piston 21, respectively. has been done.

Since the embodiment shown in FIGS. 5 to 7 is configured as described above, after completing the radial key setting operation (not shown) through the radial key nozzle 2, the casing 12 is inserted into the double blind for pressure leakage test. After fitting into the through hole 4 of the plate 3, when pressurized gas is supplied from the lock pressure flexible tube 23 to the lock cylinder chamber 15 via the lock pressure die 22, the piston 16 is pushed out and the piston wedge surface 19
The ball 18 is pushed out in the radial direction and engaged with the annular groove 30 provided on the inner peripheral surface of the through hole 4, and the pressure test device 11 is locked in the through hole 4 of the double blind plate 3 for pressure leakage test. Ru.

After welding 5 the double blind plate 3 to which the pressure test device 11 is attached to the inner peripheral surface of the radial key nozzle 2, weld 7 the outer periphery of the cap 6 to the edge of the radial key nozzle 2. A radiation source for radiation testing (not shown) is inserted through the inspection port 8 of 6, and the joint between the radial key nozzle 2 and the cap 6 is inspected.

After this inspection is completed, the radiation source for radiation inspection is pulled out, an inspection cap 9 is welded 10 to the inspection port 8, and this welded portion 1
0 radiological examination is performed from the outside.

Next, pressurized gas is supplied from the flexible conduit 31 previously joined to the central member 14 to the double-blind plate 3 for pressure leakage test and the sealed space 32 surrounded by the cap 6.9, and the welded portion 7, 1
0 pressure leakage test can be performed.

After this pressure leakage test is completed, the lock pressure flexible tube 23 is opened to the atmosphere, the lock cylinder chamber 15 is depressurized to atmospheric pressure, and then the lock cylinder chamber 15 is passed from the withdrawal pressure flexible tube 26 through the withdrawal hole 25 to the unlock cylinder chamber. 24 and the drawing cylinder chamber 20, the piston 16 is retracted, the ball 18 is drawn toward the center and removed from the groove 30, and the drawing piston 21 is moved into the casing 1.
2, and the pressure test device 11 is removed from the through hole 4 of the double blind plate 3 for pressure leakage test by the reaction.

The pressure test device 11 removed from the double blind plate 3 is pulled up along the guard vessel wall side 1 and prepared for the next operation.

By using the pressure test device 11 in this manner, a pressure leakage test can be performed on the final closed portion of the cap 6 and the inspection cap 9.

After the pressure leak test is completed, the pressure test device 11 is removed from the through hole 4 of the double blind plate 3, and the double blind plate 3 and the cap 6 are removed.
Since the space 32 surrounded by 9 can be brought into communication with the space inside the guard vessel, no matter how high the temperature inside the guard vessel becomes during operation, the pressure inside the space 32 will not rise abnormally. be prevented from happening.

In the embodiment shown in FIGS. 5 to 7, the pressure test device 11 is applied to the radial key nozzle 2, but as shown in FIG. Weld cap 35 to 34 3
The above-described method can also be applied to the 6-part portion, and the same effects can be obtained.

[Brief explanation of drawings]

Figures 1 to 3 are explanatory diagrams illustrating the implementation status of the conventional pressure test method, Figure 4 is an enlarged vertical cross-sectional view of the main part, and Figure 5
The figure is a longitudinal sectional side view of a portion of a radial tube to which an embodiment of the container pressure test device according to the present invention is applied, Fig. 6 is an enlarged longitudinal sectional side view of the main part, and Fig. 7 is a view taken along the , FIG. 8 is a vertical sectional side view of a drain nozzle portion to which the above embodiment is applied. 1... Guard vessel wall side part, 2...
Radial key nozzle, 3...Double blind plate for pressure leakage test, 4...Through hole, 5...Welded part, 6...Cap, 7・・・・・・Welded part, 8
...Inspection port, 9...Inspection cap,
10...Welding part, 11...Pressure test device, 12...Casing, 13...Pressure fluid injection hole, 14...Center Part, 15...
... Lock cylinder chamber, 16 ... Piston,
17...Through hole, 18...Ball, 19
... Piston wedge surface, 20... Pull-out cylinder chamber, 21... Pull-out piston, 22...
... Lock hole, 23 ... Lock pressure flexible tube, 24 ... Unlock cylinder chamber,
25... Drawing hole, 26... Drawing pressure flexible tube, 27° 28.29... Seal packing, 30... Annular groove, 31... ...
...Flexible conduit, 32...Space, 33...
... Guard vessel wall bottom, 34 ... Drain nozzle, 35 ... Cap, 36 ... Welding part.

Claims (1)

[Scope of utility model registration request] A casing fitted into a through hole of a partition plate provided at the entrance of the container, a central member surrounded by the casing forming a pressure fluid injection hole, and interposed between the inner surface of the through hole and the casing. a sealing member, a locking device for securing the casing within the through hole, a fluid actuator for remotely operating the locking device, and a pressurized fluid generating device connected to the injection hole in the central member via a flexible conduit. 1. A pressure resistance test device for a container installed in a narrow space, characterized by comprising: