JPS60171493A - Method of housing nuclear fuel to fuel transport vessel and plug for fuel transport vessel - 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 the Invention The present invention relates to a method for storing nuclear fuel in a fuel transport container and a plug for the fuel transport container.

Conventional configuration and its problems (2) As a method for storing nuclear fuel in a fuel transport container, there is a method in which cans are directly stored naked.

This type of conventional system has the disadvantage that the procedure for ensuring sealing during fuel loading is extremely complicated, and the loading process takes a long time. Another disadvantage is that the plug used to temporarily close the upper end opening of the container is easily removed or difficult to remove.

OBJECTS OF THE INVENTION An object of the present invention is to provide a method for storing nuclear fuel in a fuel transport container and a plug for the fuel transport container, which eliminates the above-mentioned conventional drawbacks.

Structure of the Invention In order to achieve the above object, the method of storing nuclear fuel in a fuel transport container of the present invention provides a method for storing nuclear fuel in a predetermined position. ! IC! Remove the outer cover and inner cover of the fuel transport container, and place the first
A guide tube with door pulp is connected, a book puller is built into the upper surface of the guide tube, and a plug in/out tube with a second door valve is connected, and after opening the first and second door valves, the plug is pulled ( 3) Pull up the plug blocking the upper end opening of the container using the upper device and place it into the plug entry/exit tube, close the first and second door valves, remove the plug entry/exit tube from the guide tube, store the nuclear fuel, and insert the plug into the plug entry/exit tube. Connect a fuel inlet/outlet tube with three door valves to the top of the guide tube, open the first and third door valves to store the nuclear fuel in the container, close the first and third door valves, and then remove the fuel inlet/outlet tube. At the same time, connect the plug inlet/outlet tube to the top of the guide tube, open the first and second door valves, fit the plug into the upper opening of the container, remove the plug inlet/outlet tube and the guide tube from the container, and place the inner and outer lids on the top of the container. This is to attach the lid.

A plug for a fuel transport container is provided with a plug body that is inserted into the upper opening of the fuel transport container, and is supported at a suitable position on the outer circumference of the plug body so as to be able to move freely twice. A retaining hook is provided that can be freely held on the mating portion, and an elevating body is provided that is movable up and down within the plug body and that locks the tip of the hook in the engaging recess when lowered. A spring is provided to urge the elevating body downward (4). (1) is a fuel transport container, with an inner lid (2
) and an outer cover (3) are attached, and a book (5) is attached to the upper opening (4). (6) is a guide cylinder having a first door valve (7) at the upper end, and (8) is a plug pulling bag W? (9) 'f: Book inlet/outlet tube with a built-in second door valve tlO at the lower end, αυ is a fuel inlet/outlet tube that has a built-in nuclear fuel pulling device o1 and a third door pulp at the lower end, 0υ is a container The pedestal is a tipping prevention fitting provided on the inner peripheral surface of the 00 container insertion hole αη. Next, the plug (5) will be explained. q is the plug body inserted into the upper end opening (4), (1) is the support shaft (a) in the window formed at the appropriate location on the outer periphery of the plug body αO.
A retaining hook is supported to be able to move vertically and vertically, and the tip (20A) can be secured against the engagement recess on the inner peripheral surface of the opening (4). The attached upper cover is an elevating body disposed within the plug body so as to be movable up and down, and has a groove (26) formed on its outer peripheral surface into which the rear protrusion (20B) of the hook holder fits. There is, but
Also, an inner flange t27)k is formed at the upper end of the inner peripheral surface. I
281 is a disc spring disposed between the upper cover (c) and the elevating body f261. Next, the plug lifting device (9) will be explained.

(to) is a box that is suspended from the lower end of the rope that is inserted into it through the through hole in the large plate of the plaque entry/exit tube (8), and □□□ is a box whose cylinder body is placed in a predetermined position inside the box (7). The cylinder device I is fixed in position and the piston rod (32A) extends downward through the shell through hole (to) in the bottom plate of the box (1). ) is rotatably supported by a plurality of lifting metal fittings whose lower ends extend downward from the 'X through hole (G),
A retaining protrusion (34A) that engages with the inner flange of the elevating body position 5 is formed at the lower end, and an inclined surface that approaches the piston rod (32A) as it goes upwards is formed on the inner circumferential surface of the upper end of the trench. (
34B). (g) is the piston rod (3
2A), and ((7) is a lifting metal holding ring provided at the center of the piston rod (32A). Note that there is a pressing protrusion on the bottom plate of the elevating body!2 [51]. The insertion hole (c) in (g) is formed.The structure of the fuel lifting device 0'4 is almost the same as that of the plug lifting device (9) (6), so a detailed explanation is omitted.

A method for storing nuclear fuel (2) will be explained based on the above configuration. First, as shown in Figure 1 (a), place the fuel transport container (1) on the container pedestal θυ, and then as shown in Figure 1 (bl), place the outer lid (3) and the inner lid. (2) and then place the guide tube (6) suspended by a crane on top of the container (1) as shown in figure (c).
The guide tube (6) is supported by the overturn prevention fitting θ→ as shown in (e), and then the plug in/out tube (8) is supported as shown in (e) of the same figure.
) on the guide tube (6), and after injecting He gas into the first and second door pulps (7) (for 10 minutes), open both door valves (7) (11 and connect the rope 01). Lower the plug lifting device (9), insert the lifting fitting (see the virtual line in Fig.
) and use the ring (b) to attach the lifting bracket to J (
lt L is expanded to engage the engaging protrusion (34, A) with the inner flange ρη. Next, the plug lifting device (9) is raised to pull out the plug (5) from the upper end opening (4) and draw it into the plug entry/exit tube (8). Next, the first and second door pulps (7
) After closing Q*, remove the plug in/out tube (8) from the guide tube (6) as shown in Figure 1 < f) (7) and shift it to the side, as shown in Figure 1 (g). Place the fuel inlet/outlet cylinder αυ on the guide cylinder (6), K < 1, inject He gas between the third door pulps (7) and (14), and then close both door valves (7) and (14). Open the fuel lifting device (1
3 and insert the nuclear fuel θ into the container (1), cut the fuel lifting device 03 from the nuclear fuel 1411 and lift it into the fuel inlet/output cylinder OD, and remove the first and third door valves 7) θ
→ Close and remove the fuel inlet/outlet tube 01) from the guide tube (6).
As shown in the figure, insert the book inlet/outlet tube (8) into the guide tube (
6) Place the device (9) on top, open the first and second gates (7) (10, and pull the plug).
) into the upper end opening (4) as shown by the solid line in Figure 2. Next, as shown in Figure 3(a), the plug pulling device (
9), the elevating body (25) is lowered by the disc spring. Next, when the piston rod (32A) is extended as shown in FIG. 6(b), the plug (5) is pushed down by the pressing device (g). Next, as shown in the same figure (C), the plug lifting device (9) f: is slightly lowered and the piston rond (32A) is reduced by the same M1.Then, the elevating body I25) is lowered by the disc spring suction, and its elevating and lowering Body (8) The egg pushes the rear protrusion (20B) of the hook (4), and the tip (20A) of the hook (E) fits into the four retaining parts (G). This securely fixes the plug (5) to the upper end opening (4). Next, reduce the piston rond (32A) as shown in the same figure (dl). Then, the ring (b)
hits the inclined surface (34B) of the lifting fitting (3) and rotates the lifting fitting (-) inward, and the retaining protrusion (34A) comes off from the inner flange [271]. Next, when the plug lifting device (9) is raised, the lifting fitting is pulled out. Next, remove the plug entry/exit tube (8) and guide tube (6) by reversing the procedure described above, and attach the inner lid (2) and outer lid (3) to the container (
1).

Effects of the Invention As described above, according to the method of storing nuclear fuel in a fuel transport container of the present invention, nuclear fuel can be loaded into the container in a relatively simple procedure while ensuring airtightness. Also, the loading time is relatively short. -1' If you use the fuel transport container plug of the present invention,
The top opening of the container can be reliably closed, there is no risk of it coming off unexpectedly, and it can be easily removed.

[Brief explanation of drawings]

The figures show one embodiment of the present invention, and FIGS. is a longitudinal cross-sectional view of the main parts showing the procedure for installing the plug. (1) Fuel transport vessel, (2) Inner lid, (3)
... Outer lid, (4) ... Top opening, (5) ... Plug, (6) ... Guide tube, (7) ... First door pulp, (8) ... Book Inlet/outlet tube, (9)...Plug lifting device, (10...Second door valve, 0])...Fuel inlet/outlet tube, (Rui...Nuclear fuel, 0)...Fuel pulling device, θΦ...Third door valve, 00...Plug body,
Han...Hook to prevent removal, l2i51...Elevating body, Angler...Disc spring, 0...Cylinder device, ■...Lifting metal fitting, (B)...Lifting metal fitting presser ring agent
Yoshihiro Morimoto (10)

Claims (1)

[Claims] 1. Remove the outer cover and inner cover of a fuel transport container placed in a predetermined position, connect a guide tube having a first door valve to the top surface of the container, and attach a plug lifting device to the top surface of the guide tube. After connecting the plug inlet/outlet tube which has a built-in plug and a second door pulp, and opening the first and second door valves, the book that closes the upper end opening of the container is pulled up by the plug lifting device d and placed into the plug inlet/outlet tube. After closing the first and second 1-a valves, the plug inlet/outlet tube is removed from the guide tube, and the fuel inlet/outlet tube housing the nuclear fuel and having the third door pulp is connected to the upper surface of the guide tube. After opening the third door valve and storing the nuclear fuel in the container, and closing the first and third door valves, remove the fuel inlet/outlet tube and connect the plug inlet/outlet tube to the upper surface of the guide tube.1) First, second door valve. Nuclear fuel storage in a fuel transport container, characterized in that the toa valve is opened, the plug is fitted into the upper end opening of the container, the plug entry/exit tube and the guide tube are removed from the container, and an inner lid and an outer lid are attached to the top surface of the container. Method. 2. A plug body is provided that can be fully inserted into the upper end opening of the fuel transport container, and the plug body is supported at an appropriate position on the outer periphery of the plug body so as to be movable up and down, and the tip can be secured to the four securing parts on the inner peripheral surface of the opening. A hook is provided to prevent the plug from being pulled out, and an elevating body is provided that is movable up and down within the plug body and engages the tip of the hook in the engagement recess when lowered, and urges the elevating body downward. A book for fuel transport containers characterized by being equipped with a spring.