RU2236052C2 - Refueling machine for nuclear reactor fuel assemblies - Google Patents

Abstract

FIELD: nuclear power engineering.

SUBSTANCE: refueling machine has telescopic rod with grip. The latter is controlled by rope drive. Inner section of rod has slider with rocking grip. The latter is loosely mounted on same axle as rope pulley. Axle of other rope pulley is secured on rocking grip. Rope is passed through both pulleys and presses rocking grip to stop due to tensile force of rope. The latter is joined with slider through spring which presses rocking grip to other stop in absence of tensile force of rope. In case of failure of grip control element refueling operation is ceased and grip is disengaged from fuel assembly.

EFFECT: enhanced safety in operation.

1 cl, 6 dwg

Description

The invention relates to the field of nuclear engineering, in particular to equipment designed for carrying out transport and technological operations when loading and unloading fuel assemblies of a nuclear reactor.

A device is known for reloading fuel assemblies (1), comprising a rack, a reciprocating moving rail with a gripper connected by a flexible connection through a movable unit to a balancing device consisting of a planetary mechanism, a flexible coupling drum, and an additional rail interacting with a power element.

The disadvantage of this device is the inability to complete the operation of overloading the fuel assemblies and disengaging from the fuel assemblies upon failure of the gripper control in case of exceeding the loads.

A device for carrying out manipulations with reactor fuel (2) is known, comprising a telescopic manipulator, an installed assembly for gripping a fuel assembly on the circumferential surface of the end portion of the guide tube, which is mounted with the possibility of vertical movement in the inner rod of the manipulator.

The disadvantage of this device is the inability to complete the operation of reloading fuel assemblies and disengaging from fuel assemblies in case of failure of the control body when the loads are exceeded.

The prototype of the invention is a device for reloading fuel assemblies of a nuclear reactor (3), containing a transfer tube with a drive. A shut-off valve is installed in the lower part of the transfer pipe with a drive placed in the upper part of the transfer pipe by means of a rod consisting of two sections. At the bottom of the inner section, a grip is fixed. At the upper end of the device for overloading fuel assemblies, a gripping rod lifting drive is installed. Capture by the lift drive drops to the clutch with the spent fuel assembly. Then, with the help of the drive, further lifting of the shutoff valve begins. In this case, the thrust stop of the shut-off valve when moving up interacts with the stop of the telescopic rod and first compresses the brake spring of the catchers, thereby eroding the brake, and then, upon further lifting, transfers to the stop the required force of the FA assembly.

The disadvantage of this device is the inability to complete the operation for reloading fuel assemblies and disengaging from fuel assemblies in case of failure of the gripper control body when the loads are exceeded.

The present invention solves the problem of completing the operation of reloading fuel assemblies and disengaging from fuel assemblies upon failure of the gripper control body in the event of a cable break in case of exceeding the rope tension force.

To achieve the specified technical result in a machine for reloading fuel assemblies of a nuclear reactor containing a telescopic rod with a grip controlled by a cable drive, an internal section of the rod including a slider with a swinging grip mounted movably on the same axis as the cable block, the axis of the second cable block is fixed to the swinging the grip, while the rope passing through both blocks and pressing the swinging grip against the stop by the tension of the rope is connected to the slider by a spring pressing the swinging grip to the other abutment in the absence of force of rope tension.

A distinctive feature of the invention is that the inner section of the rod includes a slider with a swinging grip mounted movably on the same axis as the rope block, and the axis of the second rope block is fixed on the swinging grip, while the rope passing through both blocks and pressing the swinging grip against the stop the rope tension force is connected to the slider by a spring, which presses the swinging grip to another stop in the absence of rope tension force.

Due to the presence of these signs, the operation of overloading the fuel assemblies of a nuclear reactor is completed when the rope controlling the capture is broken, in case of exceeding the tension of the rope, the reliability and safety of the machine are increased.

The proposed machine for reloading fuel assemblies of a nuclear reactor is illustrated by the drawings in figures 1-6.

Figure 1 - shows a General view of a machine for reloading fuel assemblies of a nuclear reactor;

figure 2 is a longitudinal section aa the inner section of the rod in normal mode “Capture is closed);

figure 3 is a longitudinal section bB of the inner section of the rod in normal operation, “Capture is closed”;

figure 4 is a longitudinal section aa of the inner section of the rod in normal operation, “Capture is open”;

5 is a longitudinal section aa of the inner section of the rod in the position “Capture is closed;

6 is a longitudinal section aa of the inner section of the rod in emergency operation, “Capture open”.

The machine for reloading the fuel assemblies of a nuclear reactor (Fig. 1) consists of a bridge 1 mounted on a rail 2. A truck 3 moves on the rails of the bridge, on which a telescopic working rod 4 is mounted with a gripper 5 on the inner section 6. Vertical section movement and control the capture is carried out using the drive 7.

The capture control is carried out by changing the position of the control load 8 using the rope 9, which is the control body of the capture, i.e. in the lower position of the control load 8, the gripper is closed, in the upper - open. A hook 10 is rigidly mounted on the control load. The movement of the inner section is carried out by a rope 11 connected to the rod 12, which, in turn, is connected to the slider 13, which is able to move relative to the inner section 6. Inside the slider 13, the block 15 is movably mounted on the axis 14 swinging gripper 16. On the swinging gripper 16 an axis 17 is installed with the block 18. The rope 9 runs around blocks 15 and 18 (figure 2). The movement of the swinging jaw 16 is limited by the stops 19 and 20 (figure 2 and figure 3).

The operation of the machine for reloading the fuel assemblies of a nuclear reactor is as follows.

In normal operation (position “Capture is closed”, figure 2) the opening of the capture is carried out by moving the rope 9, raising the control load 8 to the position “Capture is open” in normal mode of operation (figure 4). The engagement of the swinging gripper 16 with the hook 10 does not occur, because the tension force of the rope 9 deflects it until it contacts the focus 20. The movement of the inner section 6 with an open or closed grip is carried out by synchronous movement of the ropes 9 and 11.

Mode 1 - emergency operation in the “Capture closed” position upon completion of the operation when the rope 9 is broken (Fig. 5).

When the rope 9 is broken, the tension force of the rope 9 is absent and the spring 21 will move the swinging gripper 16 until it comes in contact with the stop 20. The reloaded product is transported to the coordinate of the desired cell and is lowered into it using the rope 11. After installing it with an additional stroke of the rope 11, the slider 13 moves relative to the inner section 6 down to the engagement of the swinging jaw 16 (Fig. 5) with the hook 10. With this movement of the rope 11, the slider 13, the swinging jaw 16 and the control load 8 engaged with it opening the grip.

Mode 2 - emergency operation in the “Capture open” position (Fig.6).

The slider 13 picks up the inner section 6 and the telescopic rod 4 is assembled and disassembled for repairs.

The present invention allows to complete the operation of overloading the nuclear reactor in the event of a breakage of the rope controlling the capture, in case of exceeding the tension of the rope, thereby increasing the reliability and safety of the machine.

  Sources of information

1. Auth. St. USSR No. 2742524, cl. G 21 C 19/10, 1979.

2. Japanese Patent No. 57-110752, G 21 C 19/18, 1982.

3. Auth. St. No. 1820763, G 21 C 19/10, 1991 (prototype).

Claims (1)

A machine for reloading fuel assemblies of a nuclear reactor containing a telescopic rod with a grip controlled by a cable drive, characterized in that the inner section of the rod includes a slider with a swinging grip mounted movably on the same axis as the cable block, and the axis of the second cable block is fixed to the swinging grip, in this case, the rope passing through both blocks and pressing the swinging grip against the stop by the tension force of the rope is connected to the slider by a spring pressing the swinging grip to the other stop in the case of Corollary rope tension forces.

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