JPS59164993A - Device of charging and discharging reactor control rod driveaxis - 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 The present invention relates to a nuclear reactor control rod drive shaft loading/unloading device for transporting a nuclear reactor control rod drive shaft from and into the reactor.

During regular inspections at a nuclear power plant, the power plant is shut down and the spent fuel is removed from the reactor.Prior to this, the reactor control rod drive shaft in the upper core structure of the reactor is pulled out and transported. , and after charging nuclear fuel into the reactor, K
, it is necessary to carry them into the upper core structure, but conventionally, multiple reactor control rod drive shafts were pulled out and carried in one by one using a tool, so it took a long time to carry them in and out. This method has the disadvantage that it requires a lot of time and is extremely troublesome work.

The present invention was developed in order to eliminate the above-mentioned drawbacks of the conventional nuclear reactor control rod drive shaft loading/unloading device, and is a nuclear reactor with a plurality of guide rods extending in the vertical direction. A moving frame placed on the container, a lifting platform that is fitted and supported by the guide rod and moves up and down, a lifting drive mechanism for the lifting table mounted on the front anti-movement frame, and a predetermined interval between the lifting tables. It is characterized in that it is equipped with a gripping mechanism for a plurality of reactor control rod drive shafts arranged at the same time. The object of the present invention is to provide a device for carrying in and out of a nuclear reactor control rod drive shaft that eliminates the above drawbacks.

The present invention has the above-mentioned structure, and has a plurality of guide rods extending in the vertical direction and is placed on a reactor vessel, and a moving frame that is fitted and supported by the guide rods to move up and down. the platform, a lifting mechanism for driving the lifting table mounted on the moving frame, and a gripping mechanism for a plurality of reactor control rod drive shafts arranged at predetermined intervals on the lifting table. , when the moving frame is placed on the reactor vessel and the lifting platform is lowered by the lifting drive mechanism, the plurality of gripping mechanisms can simultaneously grip and hold the plurality of reactor control rod drive shafts in the upper reactor core structure; It can be carried out using the movable table.

By reverse operation, a plurality of reactor control rod drive shafts can be carried into and placed in the upper core structure at the same time, and by placing the moving frame on the reactor vessel and positioning it, the plurality of gripping mechanisms are placed in the upper core structure. It is precisely positioned on the reactor control rod drive shaft in the reactor core structure or on the planned location, and it is extremely easy to grasp and position multiple reactor control rod drive shafts in the reactor by raising and lowering the lifting platform. , as well as being done quickly and accurately.

A plurality of rods can be carried in and out at the same time, and the performance, reliability, and efficiency of carrying in and out of the reactor control rod drive shaft are significantly improved.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

An embodiment of the present invention is shown in Figs. 1 and 2.
(c) is the core tank (upper core structure in BL); (d) is the upper core structure (multiple reactor control rod drive shafts arranged in AL; Multiple guide stands (1) arranged on the outer periphery, guide stands (1)
) A connecting piece (2) provided at the top, a plurality of guide rods (4) extending in the vertical direction to which a lifting drive mechanism installation stand (3) is attached, and a connecting piece (6) to connect the guide stand)
``Guy F'! (5) attached to ``(1)'' and the hanging fitting (20) connected to the upper part of the guide rod (4), etc.
Therefore, a moving frame is constructed, and the moving frame is moved by being suspended by a hanging fitting by a crane or the like, and is also carried onto the reactor vessel (al) and attached to the lower end of the guide rod (4). Fit the hole into the guide bin Qυ installed upright on the flange of the upper core structure (cl), position and place it, and place the lower end of the guide stand F'' (1) stably on the flange of the reactor vessel (a). The structure is such that

Further, the lifting platform (7) is arranged so that the plurality of guide rods (4) of the moving frame
) is mounted and supported so as to be able to rise and fall freely by fitting the sleeve (7a), and on the installation base (3) is a drive machine (8), a transmission shaft ( 9), a gear box a @ connected to the end of the transmission shaft (9), a vertically installed ball screw (11) that is rotationally driven via the gear box (10), and a Paulsgelyu α1) K screw connection An elevating and lowering drive mechanism for the elevating table (7) is provided, which comprises a nut a2 fixed to the elevating table (7) side.

Furthermore, a plurality of gripping mechanisms (t3) for reactor control rod drive shafts (dl) are fixedly installed on the lifting platform (7), and each gripping mechanism α
(2) are arranged at a predetermined interval so as to face each reactor control rod drive shaft (d) arranged in the upper core structure (c), and each gripping mechanism α In each case, a drive shaft protection tube Q4) is installed vertically in a series on the lower side. Note that (to) in the figure is a workbench installed at the top of the moving frame.

Since the illustrated embodiment has the above-mentioned configuration, the movable frame is lifted by a crane (not shown) using the hanging fittings (20) and carried onto the reactor vessel (a), and each guide rod (4) is The hole provided in the lower part is fitted into the guide bin (21) on the flange side of the upper core structure (cl) for positioning, and the moving frame is accurately placed on the reactor vessel.

Next, the transmission shaft (9) is moved by the drive machine (8) of the lifting drive mechanism.
When the lifting platform (power is lowered) is lowered by the ball screw Q21 (rotating the LD and screwed into the ball screw (L)+) through the gear box a0, the upper core structure (located in the al When the upper part of each of the reactor control rod drive shafts (d) protruding from the upper surface is inserted into each drive shaft protection cylinder Q4) and the gripping mechanism (1) is reached, the elevator platform (7) is stopped. , the worker on the workbench (to) can operate each gripping mechanism Q3 to grip the upper part of each reactor control rod drive shaft (d), and furthermore, by the reverse drive of the lifting drive mechanism After pulling out each reactor control rod drive shaft (d) by raising the lifting platform (7), a crane (not shown) moves the movable frame to a predetermined position on the work floor using a hanging bracket (20), The reactor control rod drive shaft (a) of the reactor control rods (a) can be carried out at the same time, and by the above-mentioned reverse operation, they can be simultaneously carried into the upper core structure (AL) of the reactor vessel (AL) and arranged therein.

Therefore, according to the above embodiment, by placing and positioning the movable frame on the reactor vessel (Al), a plurality of gripping mechanisms α9
゛ is each reactor control rod drive shaft (
dl or on the upper core structure (c), and by lifting and lowering the lifting platform (7), it is possible to grasp multiple reactor control rods (drive shafts (a)) and position them within the reactor. It is easy, quick, and accurate, and multiple rods can be carried in and out at the same time, and the performance, reliability, and work efficiency of the reactor control rod drive shaft (d) are significantly improved.
It is extremely effective in reducing radiation exposure for workers.

Although the present invention has been described above with reference to embodiments, it goes without saying that the present invention is not limited to these embodiments (and that various design modifications may be made without departing from the spirit of the present invention). It is.

[Brief explanation of the drawing]

Figure 1' is a side view of a system 1 with a partial cross section showing an embodiment of the present invention;
FIG. 2 is a cross-sectional view of the section 1-1 in FIG. a: Reactor vessel C: Upper core structure d: Reactor control rod drive shaft 1 Guide stand 6: Installation stand 4: Guide rod 7: Lifting platform 8: Drive machine 9: Transmission shaft 10: Gabox 11: Ball Screw 12: Nut 16: Gripping mechanism 14: Drive shaft holding tube 2o: Hanging fitting 60: Workbench sub-agent Patent attorney Shige Okamoto 2 other people

Claims (1)

[Claims] A moving frame that has a plurality of guide rods extending in the vertical direction and is placed on the reactor vessel, a lifting platform that is fitted and supported by the guide rods and moves up and down, and the lifting platform that is mounted on the moving frame. A reactor control rod drive shaft loading/unloading device characterized in that it is equipped with a platform elevating and lowering drive mechanism, and a plurality of reactor control rod drive shaft gripping mechanisms arranged at predetermined intervals on the elevating platform. .