JPS6061687A - Travelling track facility around pressure vessel for nuclear reactor and method of constructing said facility - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a running track facility for an inspection device around a nuclear reactor pressure vessel and a method for constructing the same.

[Background of the invention]

In order to inspect the reactor pressure vessel (hereinafter referred to as RPV), in particular, to inspect its welded parts, installing a running track for running an inspection device such as an ultrasonic flaw detector along the welded part of the RPV is an example of Japanese Patent Laid-Open No. It is known as disclosed in Japanese Patent No. 48-72591.

However, in the known technology, only a vertical track is provided along the longitudinal welds of the RPV fuselage in order to take the inspection device in and out, and it is difficult to install the inspection device on the circumferential track along the circumferential welds. It had not been set up since then. In addition, since the RPV was installed in the containment vessel and the r-shield, the tracks were carried into the gamma-shield and installed, which resulted in poor workability and accuracy due to space constraints. Both cases involved creating a circumferential orbit because the nozzle was in the way.

[Purpose of the invention]

One object of the present invention is to provide a traveling track facility with a unitary configuration having both a longitudinal track and a circumferential track that allows inspection equipment to be moved along the longitudinal and circumferential welds of an RPV fuselage. It is in.

Another object of the present invention is to provide a method for easily and accurately constructing the above-mentioned running track equipment.

[Summary of the Invention] The traveling track equipment according to the present invention includes one or more circumferential tracks arranged along the m-joint part of the RPV, one or more longitudinal tracks, and these circumferential tracks and the vertical track. It consists of a turntable unit that is connected at the intersection and has a swivel base that turns the inspection device to both the circumferential orbit and the vertical orbit, and the vertical orbit above the uppermost circumferential orbit is connected to the reactor pressure. It is characterized by being suspended and supported by a gamma shield around the container.

Furthermore, the method for constructing a running track facility according to the present invention includes installing one or more circumferential tracks and these circumferential tracks on the outer circumferential surface of the reactor pressure vessel before it is suspended into the containment vessel, along the welded portion of the pressure vessel. A track unit consisting of at least one vertical track connected to the circumferential track via a turntable unit is temporarily installed between the tracks, and this track unit is connected to the r-shield in the containment vessel together with the reactor pressure vessel. After that, the vertical track above the uppermost circumferential track of the track unit is connected to the track unit via the turntable unit, and then the upper vertical track is suspended and supported by the γ shield. It is characterized by:

[Embodiments of the invention]

Diagram M1 shows the RPV of a boiling water reactor installed within the gamma shield. In the diagram, RPV 1 is Scar) 7 J & part on pedestal 8? It is fixed to the base 9 and is connected to a containment vessel (not shown) via a stabilizer bracket 0 and a stabilizer pipe (not shown) to prevent it from falling over. The body portion 2 of the RPV 1 is provided with multi-μ nozzles 14 to 18 for connection to piping (not shown). Further, a heat insulating wall 19 is provided on the outside of the body portion 2,
Furthermore, a nozzle opening 21 is provided in the heat insulating wall 19 and the γ shield 20, on which the γ shield 20 is located. Since the body part 2 of the RPV 1 is composed of a plurality of semicircular blocks, there are several circumferential weld lines 12 and longitudinal weld lines 13.

In order to move the inspection device along the weld line of the RPV 1, in the embodiment of the running track equipment of the present invention, there is a circumference between the fuselage part 2 and the gamma shield 20 along the circumferential weld line 12 of the fuselage part 2. Tracks 22-1 to 22-4 and vertical tracks 23-1 to 23-4 along the vertical weld line 13 are installed. These tracks are connected by a turntable unit 24.

The inspection device (not shown) can be inserted into and removed from the track from the upper end of the uppermost vertical track 23-1 or the lower end of the lowermost turntable unit 24, and is
4, and by rotating the turntable at the turntable unit 240 to completely change the course, it is possible to freely travel on the circumferential tracks 22-1 to 22-4. Although not shown, vertical tracks similar to the above-mentioned vertical tracks 23-1 to 23-4 are arranged along the vertical welding line at an axially symmetrical position on the body of the RPV.

FIG. 2 shows details of vertical tracks 23-1 to 23-4 provided between the fuselage section 2 of the RPV 1 and the r-shield 20.

if (Tracks 23-1 and 23-2 are connected in a straight line via turntable unit 24. Vertical track 23-
1 is suspended and supported by the gamma shield 20 by fixing a bracket 26-3 fixed thereto to a bracket 26-1 fixed to the r shield 20. Its details are shown in Figure M4 (top view) and Figure 5 (side view). As shown in the figure, the vertical track 23-1 is attached to the bracket 26-1 fixed to the γ shield 20 by bolts 26-2.
The bracket 26-3 is fastened.

The bracket 263 penetrates the heat retaining wall 19.

Similarly, the longitudinal track 23-3 is suspended and supported by the γ shield 20.

The WJa diagram shows one of the turntable units [1
This is a view towards 111. The turntable unit 24 is installed at each intersection of the vertical track and the circumferential track to connect these tracks to each other, and enters the track 24-1 on the swivel base 24-3 and stops. The inspection device was installed on the swivel table 24-
It is possible to turn together with 3 and advance to other orthogonal orbits.

The housing 24-2 of the turntable unit 24 is
The swivel table 24-3 is held freely rotatable and the vertical track and the circumferential track that intersect there are rigidly connected. Swivel base 2
There is a drive shaft 24-4 at 4-3, which passes through the heat retaining wall 19. Furthermore, two locking portions 24-5 are provided on the drive shaft 24-4 at an interval of 90 degrees, and each locking portion 24-5
5, one of which engages with a removable stopper/f24-6 provided in the housing 24-2, and rotates the swivel base 24-3.
This is to stop the rotation of. When the operator wants to rotate the swivel base 24-3, as shown in FIG.
4-6 from the locking portion 24-5, the handle 27 may be rotated by 90°. ” The running track is vertical track 23-1.23-2, circumferential track 22-
Upper group consisting of 1.22-2 and vertical track 23-3
, 23-4, circumferential orbit 22-3.

22-4, and the track of each cruise is integrally connected through the turntable unit 24f as described above to form a track unit, and the vertical track 23-1 and 23-, respectively. 3 is suspended and supported by the γ shield 20. According to this structure, even if the circumferential orbits 22-1 to 22-4 expand or contract, the change can be absorbed by slight deformation of the vertical orbits 23-1 to 23-4. However, simply hanging it from above is vulnerable to earthquakes, etc., so a connecting rod 28 is provided between each of the two circumferential orbits, and this connecting rod 28 is attached to the γ shield 20 via a telescoping mechanism 29-1. 29-:2
(See Figure 6).

In other words, the telescopic mechanism 29-1 connects the connecting rod 28 to the γ shield 20.
It elastically pulls to 11tl and acts as a steady rest for the orbit unit and t.

Next, the entire method of constructing the above-mentioned running track will be explained.

(1) Assembly preparation The circumferential track 22-1.22-2 and the vertical track 23-2 are assembled together with the turntable unit 24, and the circumferential track 22-3, 22-4 and the vertical track 23-4 are separately assembled on the turntable. 24 and -4 to make the respective orbital units 22.

(2) Temporary installation The ring-shaped track unit 22 assembled as described above is temporarily installed on the outer periphery of the RPV fuselage 2 before being suspended in the reactor containment vessel. For temporary installation, track unit 2
2 is installed as shown in Figures 7(A) and (B) to prevent the track unit from shifting when the RPV is hoisted (described later).
RPVO) rTemporarily supported by a rope 32 with a ring 31 hooked on the ropes 15, 16, 17, etc., and
As shown in the figure, the adjustment port 33 provided around the entire circumference of the orbit unit 22 is temporarily fixed via a retainer 34 that is engaged with the body 2 of the RPv.

(3) Hanging the RPV The RPV with the track unit 22 temporarily installed in this way
As shown in FIG. 9, the r-shield 2 is transported by a conventional method and lifted by a lifting device 35, and the r-shield 2 in the reactor containment vessel 5 is transported as shown in FIG.
Hang within 0.

(4) Attaching the temporary support device The temporary support bracket 36 and the track support and steady rest brackets 26 and 29 are attached to the γ shield 2.
0 (see Figure 11).

(5) Adjustment of the position of the orbit unit 220 The circumferential position of the orbit unit 220 is adjusted as shown in FIG. 12 using a chain block 37 hung between the orbit unit 22 and the r shield 20 (7).

The height direction position of the track unit 22 is adjusted by a jack gel 38 provided on a temporarily supporting adjustment bracket 36, as shown in FIG. Furthermore, the gap with the RPV fuselage 2 is adjusted using the adjuster belt 33 used for temporarily fixing the track unit.

(6) Addition of vertical tracks Fix vertical tracks 23-1 and 23-3 respectively m22-
1 and 22-3. After adjusting the position of the vertical track, the bracket 26-1 of the r shield 20 and the bracket 2 of the vertical track 23-1.23-3
6-3 are connected and fixed with bolts 26-2. Further, the connecting rod 28 is connected to the support plastic of the γ shield 20 via the expander s29-1 as described above. Bolt connection to 29-2. It is best to weld these bolts with MD fixation.

(Power driving confirmation Ajiasu) yl? After removing the bolts, etc., run the inspection device and check.

According to the method described above, most of the installation work around the RPV on the track can be done in a large space, and the adjustment of the installation position can be completed 11 times before the installation work. Therefore, final adjustment after RP■ installation becomes easy. Moreover, since the installation accuracy is increased, the accuracy of the traveling position of the inspection device is also improved.

〔Effect of the invention〕

The running track equipment of the present invention is equipped with both a vertical track and a circumferential track, which are connected by a turntable unit and suspended from the γ shield around the RPV. It has excellent advantages such as being able to run to the required location both in the circumferential direction, as well as having no running track directly attached to the RPVK, and being able to absorb thermal expansion caused by temperature changes. .

Further, according to the method for constructing running track equipment of the present invention, most of the construction work can be performed in a wide space before suspending the RPV into the γ shield. Therefore, the work is easy, and there is no interference from the RPV nozzle. Most of the position adjustment is completed in advance and only the final position adjustment is required after the RPV is hung. This improves the construction accuracy and the running of the inspection equipment. This is effective in that it is expected to improve accuracy.

[Brief explanation of the drawing]

Fig. 1 is a track diagram of an RPV equipped with running track equipment according to an embodiment of the present invention and its peripheral equipment, Fig. 2 is a sectional view of the vertical track and its vicinity, and Fig. 3 is a detailed side sectional view of the turntable unit. Figure 4 is a detailed top view of the vertical track fixing bracket, Figure 5 is a side view of the same, Figure M6 is a detailed side sectional view of the track locking part by the steady rest, Figures 7 (B) and 8 Figures (A) and (B) are diagrams showing the state of the temporary installation work of the track unit, Figures 9 and 10 are diagrams showing the work of carrying the RPV into the containment vessel, and Figures 11 and 12 are the tracks. It is a figure showing installation position adjustment work. 1...RPV 2...RPV fuselage i 2 , i 3 ・RPV welding line, 15.16,1
7.18... Nozzle 19... Heat insulation wall, 20... r shield 22-1.
22-2.22-3.22-4... circumferential orbit, 22...
- Track unit 23-1.23-2.23-3.23-4... Vertical track, 24... Turntable unit 26-1.26-3... Bracket, 28... Connecting rod, 29...Bracket. Second cause

Claims (1)

[Scope of Claims] 1. At least one circumferential orbit disposed along the welded portion of the reactor pressure vessel, at least one longitudinal orbit, and the intersection of these circumferential orbits and the longitudinal orbit. It consists of a turntable unit that has a swivel base that connects the inspection device to both the circumferential orbit and the vertical orbit. A running track facility for running an inspection device around a reactor pressure vessel, characterized in that it is suspended and supported by a gamma shield around the reactor pressure vessel. 2. A method of constructing a running track facility for running an inspection device around a reactor pressure vessel along a welded part of the pressure vessel, the method comprising: and a track unit consisting of at least one circumferential track along the welded part and at least one vertical track stretched between these circumferential tracks and connected to the circumferential tracks via a turntable unit. is temporarily installed, and this track unit is suspended together with the reactor pressure vessel into the gamma shield in the containment vessel.Then, the vertical track above the top circumferential track of the track unit is moved through the turntable unit. A method for constructing running track equipment, characterized in that after connecting to a track unit, the upper vertical track is suspended and supported on a γ shield.