DE2017912A1 - Grapple - Google Patents

Description

Licentia Patent-Verwaltungs-GmbH. 6 Frankfurt / M., Theodor-Stern-Kai 1

March 23, 1970 ■ T 69/94 - Sehn

Schn / kf '■'

Grapple

When changing the fuel element, the z. B. with light water EeaKtoren must be carried out usually once a year, the spent fuel elements and possibly also exchanged damaged or used control rods for new ones. This is done by gripping tools that are attached to a Fuel element changing machine are attached and in bracket of the control rods or /. Hold fuel assemblies.

Because the fuel elements are much heavier than the control rods and the space in the reactor core is

Do not allow the use of unnecessarily strong brackets for the control rods, the brackets of the control rods and the the fuel assemblies can be designed differently; namely "the control tab transport bracket is higher and in cross-section weaker than the focal point. In addition,

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is a safety requirement that are taken for the expansion of fuel Torkehrungen that make a deviating from the loading and unloading plan control rod expansion impossible, "It should be borne in mind that the operator of ausGründen make ^work; Savings could be tempted to dismantle control rods and fuel assemblies that are close together, instead of moving to different core positions. Such an unauthorized deviation from the prescribed loading and unloading plan could start a chain reaction in the nuclear fuel, which would have to lead to a major accident.

So far, one has to avoid such operating errors different grippers are used. The gripper for the fuel assemblies was then designed in such a way that control rods could not be grasped with him.

A gripper for fuel assemblies in nuclear reactors is z. B. in German patent specification 1098.175. The head part of the gripper according to Figure 1 consists of two parallel plates, each with a wedge-shaped recess on opposite sides. A gripping hook, which is moved by a linkage, is pivotably arranged between the plates. In ScIu ¹ If t, column 3 is the last. Sentence _: - stated that "depending on the type and shape of the loads and the. Müyj.liohk-i-iöc-a of the suspension, the recesses are suitable aasaubLl; sn r-ind," Jer. · 'Ire-ifer thus has the . Disadvantage that or ni-ut · '■. .-. -10 0 8.44 / 0801;

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can optionally be used for various tasks.

The inventor has therefore set himself the task of developing a gripper that can be used in a simple manner Gripping of the various bracket of control rods and fuel assemblies can be adapted and with the -beim Dismantling of fuel assemblies, control rods cannot be grasped inadmissibly.

This task is performed with a gripper with a swiveling gripping hook which is inserted into a mouth-like opening of a head piece engages, solved in that an insert is arranged in the inside of the mouth of the head piece that it can be brought into at least two positions and is designed in such a way that different cross-sections are released for receiving differently designed bows will,.

An embodiment of the invention is shown in the drawing and is described in more detail below. Show it:

Figure 1 is a section through the lower part of the invention Gripper,

Figure 2 the gripper according to Figure Λ seen from below,

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FIG. 3 shows the insert inserted into the gripper in a position A- on a larger scale,

FIG. 4 shows the insert pushed into the gripper in FIG a position B on a larger scale.

Reference is first made to FIGS. 1 and 2. Both figures show a head piece labeled 1, which is firmly connected to a cylindrical part 2. A gripping hook is rotatable in the cylindrical part 2 3, which is guided through a lateral recess 4 in a mouth-like opening 5 of the head piece 1 * By means of a pull rod 6, the gripping hook from the mouth-like opening 5 can be swung out * Inside of the head piece is a slot 7 to which the mouth-like opening '5 leads. When lowering the grapple on a bracket to be gripped, the mouth-like opening 5 serves to center the gripper over the bracket in such a way that it easily enters the slot 7.

As can be seen in FIG. 1, a groove 8 and 9 is made in both sides of the slot 7, into which, as shown enlarged in FIGS. 3 and 4, guide springs 1 (V and 11 of an insert 12. The insert 12 is fork-shaped formed and has the fork sections 13 and 14. - ^ r can be in two positions A and B of the

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Side from above the mouth-like opening 7 are inserted into the grooves 8 and 9 of the slot 7.

In the position A, the fork sections 13 and 14 towards the mouth-shaped opening, the ".Veite of the slot 7 through the fork sections 13 and 14 by their wall thickness is decreased. The position A is intended for receiving the control rod transport bracket.

In the position B, which serves for the reception of fuel transporting hangers, extend the fork portions 13 and 14 in similar grooves 15 and 16 of the slot 7> so that the full width of the slot is maintained to the insert out.

In position A, the fork sections 13 and 14 in the slot 7 ensures that the thicker stirrups of the fuel assemblies do not get into the slots 7, and so that can be grasped by the grapple hook. In position B, intended for lifting fuel assemblies is, it is ensured that the control rods cannot be gripped because they are attached to them by the insert 12 are prevented so far into the slot 7 that they can be grasped by the grapple hook. To Eigur 2 is It should also be noted that in the left half of the illustration the insert 12 is in position A, that is to say in position zur .aufnahme of control rods, is shown, while in the right half of the representation of the insert Is shown in position B, so üass the full

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Width of the slot 7 for receiving fuel assembly transport brackets is available.

Another option for a gripper according to the invention consists in the interior of the mouth-shaped Opening 5 i & the slot 7 instead of the described insert 12 in a circular expansion to arrange an insert which is rotatable about a central axis and which at various points on its circumference has different recesses that correspond to the different Ironing of fuel assemblies and control rods are adapted. With this version, e.s is also light possible to attach more than two different recesses, so that the gripping tool is much more than the previously mentioned purposes «,

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Claims (5)

Licentia Patent-Verwaltungs-G.m.b.H. 6 Frankfurt / M., Theodor-Stern-Kai 1 March 23, 1970 'F 69/94-Schn. Schn / kf. Claims iy gripper with swiveling gripping hook, which is inserted into a jaw-like, Opening of a head piece engages, thereby ge. indicates that inside the mouth of the head piece (1) an insert (12) is arranged such that it can be brought into at least two positions and is designed in such a way that different cross-sections for 'receiving differently designed Transport wings are released. 2. Gripper according to claim 1, characterized in that that the insert (12) is fork-shaped and ■ the fork sections (13), (14) in a possible position of the insert (12) reduces the V / ice of the mouth-shaped opening (5) in the mouth interior. 3. Gripper according to claim 1, characterized in that in the luaul.inneren hats (8, 9) for holding .des A - 109844/0801 8 - ■ ■ - ■ '. ϊ ¹ 69/94 - Sehn - - '2Q17912 Set (12) are provided in which the 'fitting optionally can be used in a position changed by 180 °. 4, gripper according to claims 1 and 2, characterized in that a guide spring (10, 11) is arranged on each of the fork surfaces (13-14) of the insert (12) that engage in the grooves (8 and 9) inside the mouth. . 5. Gripper according to claim 1, characterized in that inside the mouth-shaped opening (5) in a circular extension around a central one Axis rotatable insert is arranged, which different on its circumference at different points Has recesses for the different traasportballs of fuel assemblies and control rods are adapted. 109844/0801