JPS5842997A - Device for mantling and dismantling stretch . tube . nut of internal pump - 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] This Ii@ is a boiling water reactor with 4 internals! Stretch Te. - Regarding the installation and removal of nuts, in general boiling water type atoms, 0 ml of recirculation outside the reactor pressure vessel.
Il y f &Otl'zt inside the reactor pressure vessel }
lW! The coolant is recirculated between the reactor pressure vessel and the reactor pressure vessel, but the structure of such a recirculation system is complicated, and the recirculation system can cause cavitation and the reactor pressure vessel and recirculation. The piping between the pipe and the pipe is rounded to form a blockage of the coolant, and if the pipe breaks, there is an odor that may result in loss of coolant.

Therefore, attempts have been made to use internal runes f to deposit coolant directly at the base of Iyft in the reactor pressure vessel. As shown in Fig. 1, this internal 4 unit houses the KI3/f body inside the reactor pressure vessel 2,
This -yf main body is an internal 1:/f notch formed in the i-mirror part of the reactor pressure vessel 2, centered on the inside.
attached to the inner end of the Then, this 4-shaped main body IVi is driven via the outer shaft 4 inserted into the internal running hole 4 to drive the 4-shaped peak provided outside the reactor pressure vessel 2. The above bond body 1 is from impe 21m to di 71-de 1m.
The upper end of the stretch tube is engaged with the INK in the lower end of the differential, -de J1m, which is removed from above the reactor pressure volume tjkx, respectively. This is to fix the device 11. Then, there is a stretch chi on the jin, and a stretch chi on the outer periphery of the lower end of -fi.

-T・Nara) F is screwed together, tighten it (K), stretch・-T & −F # is pulled! Fix main body 1 to motor cage 3//JAK. When ζO, the stretch ch is tightened with a large torque at the 9th stop, and the stretch chute is given a thick tension, and during periodic inspection, etc.
To do this, first shut down the reactor, fill the reactor pressure vessel with water, fill the reactor fer with water, and then cover the reactor pressure vessel with water to cover the radiation. -Remove the medical instruments, etc., then remove the internal parts, and transport each component to a maintenance facility + voice test and maintenance. ζ0
Internal 1yypo] I! Removal work #i is carried out from above and below the pressure vessel 2, and the work is carried out in the following order. First, remove the upper engine and rotor shaft 4. After blocking the opening of the differential and IB to prevent the flow of reactor water O, drain the reactor water inside the motor casing dam. Next, remove the motor 5, etc. (from below the motor casing) and remove the motor cage yr.
Drain the reactor water in the engine and stretch the water.
f.Remove the casing 1 from below the casing.
Then, close the motor casing 1m again, grasp D7, -fJB from above the reactor pressure volume lIj, and remove D7&-D1m and stretch CH, -fg.

However, the stretch nut 1 was tightened with a large torque as described above, making it difficult to attach and remove it.In particular, the stretch nut 1 and nut r of H were stuck in the pigeon house. It was difficult to remove it.

Since the work of removing the stretch ch, -f and nut V is carried out within a narrow motor casing dam, it is expected that the work will be carried out under poor working conditions. As a result, inspection and maintenance take a long time, which results in long reactor shutdown periods and reduced operating rates. Because the work is carried out inside the reactor containment vessel, where radiation levels are high, it is not desirable for workers to enter the reactor containment vessel to perform the above-mentioned difficult work from the standpoint of radiation exposure.

The present invention was made in consideration of the above circumstances, and
The purpose of this is to
An object of the present invention is to obtain an internal stretch chain attaching/detaching device that can automatically and easily attach and detach a stretch chain.

An embodiment of the present invention will be described below with reference to FIGS. 2 and 3. Figure 2 is Internal I! Remove the 7fO*-tor, rotor shaft, impeller, etc. and empty the inside of the motor casing 5m. 5m of the Maronaka 1 Hiro reactor pressure vessel is the motor casing, and 1 is the internal.
hmm!・Nozzle, 1B is D71-DE, 6 is stretch・
CH, -TS, 1 indicates stretch CH, -P nuts,
1 in the figure is a mounting board, which is attached to the lower flange yIIK of the motor casing I. This installation is done on board a
A stretch tension mechanism go is attached to K, and this mechanism will be explained below.
For example, a pneumatic cylinder driven by high-pressure air from the outside is fixed. ζO Pneumatic Tallinn I#
The tip of the rod t has a cylindrical mouth, and the extension body 1o is fixed to it. fsa
A tension body 11 is inserted through the arm so that it can move forward and backward. A retaining part 11m is provided on the upper part of the tension body 11 to be screwed into a spiral groove previously cut on the inner surface of the lower part of the company's Tretchich. In addition, a motor 12 is housed in the rod extension body 10 and is driven by a power supply from the expansion part.
A small gear 12 is attached to the rotating shaft 1. This Ij7 gear 12m is the gear 11B of the tension body 11.
It is configured to mesh with the motor and transmit the motor Io@ rotation. In addition, a stretching mechanism 21 is attached to the outer periphery of the upper part of the rod extension body 1.
A threaded portion 10 is provided on the upper portion of the outer circumferential surface O, and a pivot support 101 is provided on the OT side of the ζO threaded portion. and 1
, This threaded portion JIliAK is screwed with the dispersion work body 11. This nut removal work body 11 has a plurality of bottles 14- as engaging portions that can be freely protruded and retracted from the upper surface, and a Sdelinda 1 housed inside the nut symbol work body 11.
1-] is biased in the protruding direction. Also, on the upper surface of the nut-bank integrated IJ, a holding part 1-- of a double Ik formed of Hirodone steel is provided. No・t'
It is constructed so that it can be held in place by elastically contacting the inside of the y-tooth 10. Further, the lower WK of the nut handling work body 130 has a plurality of sliding holes IJ, and the P extension body 100 and the shaft support portion 11NVC have a plurality of sliding holes IJ and the rotating body 11.
is pivoted. A sliding bin 1r door is formed on the upper surface of the rotating body 1r, and is inserted into the sliding hole 1jAK of the nut handling work body l#. The ζO sliding pin JFI- transmits 110 rotations of the i rolling element to the nut removal work body IJ, and is screwed into the threaded portion 10m, causing the nine nut F removal work body 1j to rotate kl! It is configured to be slidable so that it can be raised and lowered by moving the O11 rolling element IFO.A gear part 11 is provided in the inner sleeve of the lower part of the O11 rolling element IFO. A motor 11 driven by an external power supply is fixed to the outer circumferential surface of the rod extension 1 at the bottom of the rotating body JFO.A gear II is attached to the rotating shaft of the motor 110. ] It meshes with the above-mentioned support wheel part 1rm.

The nine internal run stretch nut attaching/detaching device constructed in this manner operates as follows. First of all, stretch the pneumatic cylinder yI9 to stretch the engagement part of the tension body to the lower end of -f#! ! & make contact. Then, rotate the motor 12 to stretch -f#
The engaging part 11m is screwed into the spiral groove on the inner surface of the lower part.

Next, the pneumatic cylinder t is shortened and the tension body 11 is pulled down together with the rod extension body 10 to eliminate the tensile force previously applied to the stretches Q, -D, σ. Second, the motor 11 is rotated to remove the nut removal work body IJ.
・At this time, since the wire pin 14- is provided on the upper surface of the nut removal work body 1j and is biased in the projecting direction by the Sdelinda 15-, the pin 14- is stretched.・The locking electrolyte FAIIC on the bottom surface of the nut 1 is locked.

Next, when the motor 11 is reversed, the stretch Te, -f
・The nut r is turned once together with the nut removal work body 13 and removed from the stretch tee, -fg. ・At this time, the stretch nut 1 is removed from the holding part 1#-. Since the body JJK is maintained, the removed stretch
Chichi, -de nut 1 will not fall.In addition, when applying the stretch chi, -f nut r, it is only necessary to reverse the motor 1#.

Konjo Uma Internal/yf's Stretch Chi, -f
・S,T attachment/detachment device removes the tensile force that has been applied to the stretch, -fg in advance, and stretches the stretch, -f.
This makes it easy to attach and detach the tor, even in the event that the tor is stuck or the like. Therefore, it is possible to shorten the work time and improve the operating rate of the reactor.Furthermore, if this device is attached to the motor cage, the device can be remotely controlled to perform the tasks mentioned in 6 above. This allows the radiation exposure of workers to be significantly reduced.

Furthermore, the stretch tube is screwed into the spiral groove on the inner surface of the stretch tube. Therefore, it is possible to accumulate 19 degrees in the engagement part 11 with the small peak force 11, and the spiral groove has a wide contact area with the engagement part 11. There is no risk of damaging it.

For example and without being limited to one embodiment, the rotor 11.18 may be pneumatically or hydraulically driven to generate high torque at low speeds. In addition, the locking part moving means housed in the nut-damaged work body 11 is not limited to the Sgelinda 15-, but a cylinder driven by air pressure or water expansion pressure can also be used.The device is installed under the reactor pressure vessel. The motor cable is installed through the mirror part, and the cable is attached to the inner end of the motor casing! The main body, the stretch tip inserted into the above-mentioned shell cylinder and whose upper end is attached to the above-mentioned ring body, and the stretch tip inserted into the above-mentioned ring body, are screwed together and tightened with the lower end of this strip. ) and the 6th F retch, -f] The above-mentioned stretch □・blood.

- At the time of attaching and detaching the nut, the stretching mechanism screws into the spiral groove pre-provided on the inner surface of the stretch ch, -f and applies tension to the stretch ch, -f. The above-mentioned stretch reach is equipped with a stretch reach for rotating the f-nut, and an f-nut rotation mechanism.Thus, the stretch reach is carried out in a narrow internal pump cage.・H, -f. Nut removal work can be done easily and in a short time, improving the operating rate of the nuclear reactor and significantly reducing the amount of radiation exposure of workers.It has great effects. .

[Brief explanation of drawings]

FIG. 3 is an enlarged view of a portion of FIG. 2.゛5　motor casinder, 1-dispersed board, t''...pneumatic cylinder %J#-gl sheet extension body゛'%11...tension body,
J j e 1 #-・Paper, 11-Nut removal work body, 14-Pin, 15-Sgelinda, 1 ill-”
Holding part-1'1-Rotating body, L''-Stretch tube tension mechanism% I J''Stretch tube rotation mechanism

Claims (1)

[Scope of Claims] (i) A motor casing provided through the lower mirror portion of the reactor pressure vessel, an 'I y f main body attached to the inner end of the motor casing, and the motor
The stretch tube is inserted into the casing and the upper end engages with the pump body, and the stretch tube is screwed into the lower end of the stretch tube and tightened.
In this article, the above-mentioned stretching tip of an internal puffer fish is provided with an ice sillage tip and a tip for pulling the 4y part and fixing the 4y part to the motor casing. , the above-mentioned stretch ch, -f are screwed into the spiral grooves previously provided on the inner surface.
An internal flD stretch chain, characterized in that it is equipped with a stretch chain tension mechanism that applies tension to the chain, and the stretch chain nut rotation mechanism described above. Tsu-nut attachment/detachment device. (2) The stretching chain according to Patent No. 4Y is characterized in that the stretch chain rotation mechanism is provided with the stretch chain on the tensile force generation side of the tension mechanism. -Put nut attaching/detaching device●《3》The above-mentioned stretch ch. -f tension mechanism and stretch ch. 4) stretch chain according to claim OSS, characterized in that the nut rotation mechanism is set at a predetermined position when the motor casing KIIL is attached. -pu・
Nut attachment/removal placement●