DE10226245A1 - Method and device for disposing of a fuel assembly. Disposing of a boiling water reactor system - Google Patents

Abstract

In a method for disposing of a fuel assembly box (4) of a boiling water reactor system, the fuel assembly box (4) is stabilized with a support structure (10). In this way, it can be used as a transport container for other parts to be disposed of and appropriately conditioned, in particular core installation parts.

Description

The invention relates to a Method of disposing of a fuel assembly box. Also relates the invention relates to a method and an apparatus for disposal of radioactively contaminated parts of a boiling water reactor system.

Installation parts of a nuclear reactor system that come into contact with the cooling water of the primary circuit are considerably radioactive contaminated and, if they were installed in the reactor core, additionally activated. Due to operational wear and tear, to which core components in particular are subject to a high degree, it is necessary to remove these parts and replace them with new ones. The removed parts must be conditioned in accordance with strict precautionary measures in order to make them manageable for disposal. Such a wearing part in a boiling water reactor is also the fuel assembly embrittled by the high radiation exposure of a spent fuel assembly, as for example in 1a and b is shown in a plan view of the bottom side or on one of the long sides. The wall 2 of the fuel assembly box 4 encloses an essentially cuboidal cavity 6 , The fuel assembly box 4 is open on its end faces and is only on one end face at opposite corners with support struts 8th provided for fastening the fuel assembly box 4 serve on a fuel assembly head, not shown in the figure. When conditioning such a fuel assembly, it is usually pressed and then cut into small pieces and then cut into small pieces. However, such an approach is complex.

The object of the invention is now based on a method of disposing of a fuel assembly box specify a boiling water reactor system, which compared to the the procedure mentioned in the prior art is simplified. Also lies the object of the invention is a method for disposal of radioactively contaminated parts of a boiling water reactor system and to provide an apparatus for performing this method.

The first object is according to the invention solved with a method with the features of claim 1. Da the fuel assembly thereby for the disposal is being prepared or conditioned that he is using a supporting structure is stabilized, it can also serve as a transport container for others parts to be disposed of and conditioned accordingly, in particular Core components or small-volume so-called core scrap used become. This is a complex pressing and disassembly of the fuel assembly box no longer required and its disposal is simplified.

In an advantageous embodiment of the process, the fuel assembly box with a handle Mistake. This allows him to use the same equipment in the same way be handled as they are for the handling of the fuel assembly is provided.

In a further preferred embodiment of the The support structure is pre-assembled and in the fuel assembly box introduced. This is the on the fuel assembly when attaching the support structure required processing time significantly reduced.

In particular, the fuel assembly is on one of its end faces with the help of one arranged on the supporting structure and closed as a base plate. In this way it can be used as a container can be used to pick up small-volume core scrap.

Regarding the second method mentioned the task according to the invention solved with the features of claim 6. Since the stabilized fuel assembly as a transport container for further radioactive contaminated parts is used, which is special inexpensive Disposal together with the core scrap possible.

In an advantageous embodiment of the process are controlled by a control element to be disposed of leaves separated and inserted into the stabilized fuel assembly box. There the longitudinal and Transverse dimensions of the leaves of a control largely that of a fuel assembly box can correspond this extremely space-saving be housed in a fuel assembly box on top of this Way the leaves of three controls.

In particular, the support structure divides the fuel assembly with an internal partition in at least two sub-areas during insertion of leaves is supported in one of the sub-areas. This will fill up of the fuel assembly box.

Regarding the device the stated object according to the invention solved with the features of claim 9.

Advantages of the device according to the invention as well Advantages of each of the subordinate claims result accordingly from the these claims respective corresponding procedural claims.

• 2a und b eine Draufsicht auf die Bodenseite bzw. auf die Längsseite einer erfindungsgemäßen Tragstruktur,
• 3a und b eine Draufsicht auf die Stirnseite bzw. auf eine Längsseite des mit der Tragstruktur stabilisierten Brennelementkastens,
• 4a und b eine Draufsicht auf die Stirnseite bzw. auf eine Längsseite des mit den Blättern von Steuerstäben gefüllten Brennelementkasten.

To further explain the invention, reference is made to the embodiment of the drawing. Show it:

• 2a and b a plan view of the bottom side or on the long side of a support structure according to the invention,
• 3a and b 2 shows a plan view of the end face or of a longitudinal side of the fuel assembly box stabilized with the support structure
• 4a and b a plan view of the end face or on a longitudinal side of the fuel element box filled with the leaves of control rods.

According to 2a . b includes a support structure 10 a base plate 12 , which is a partition plate running perpendicular to the flat side of the base plate 14 carries and in particular is welded to it. The partition plate 14 has a longitudinal dimension that is greater than the longitudinal dimension of the fuel assembly box 4 and is at her from the base plate 12 facing free end with a recess 16 provided so that a carry handle 18 is formed. Cross to the partition plate 14 and perpendicular to the base plate 12 is a spacer on this 20 attached to that in this area with a slit 22 provided partition plate 14 interspersed.

3a . b show the one with the supporting structure 10 stabilized fuel box 40 , For this purpose, this is from the bottom in the empty fuel assembly box 4 introduced until the base plate 12 the empty fuel box 4 closes and forms a bottom. The carrying handle 18 then protrudes over the fuel assembly box 4 out. In the figure it can also be seen that the fuel assembly box 4 through the partition plate 14 in two areas 42 . 44 is divided.

According to 4a . b are in the with the support structure 10 stabilized fuel box 40 Control rod blades 24 introduced, which were separated in a previous step from control rods to be disposed of and from which in 4b a handle of a handle halved by the preceding disassembly is shown.

The spacer plate 20 serves to support the control rod blades 24 , At the same time, below the control stick sheets 24 four subchambers 46 formed, which can be used to hold small-volume core scrap.

2

wall

4

Fuel channel

6

cavity

8th

support struts

10

supporting structure

12

baseplate

14

separating plate

16

recess

18

handle

20

spacer plate

22

slot

24

Control rod blades

40

Fuel channel

42 44

subregions

46

subchambers

Claims (12)

Method of disposing of a fuel assembly box ( 4 ) a boiling water reactor system in which the fuel assembly box ( 4 ) with a supporting structure ( 10 ) is stabilized. The method of claim 1, wherein the fuel assembly ( 4 ) with a handle ( 18 ) is provided. Method according to Claim 1 or 2, in which the supporting structure ( 10 ) pre-assembled and in the fuel assembly box ( 4 ) is introduced. Method according to one of the preceding claims, in which the fuel assembly box ( 4 ) is closed on one of its end faces. Method according to Claim 4, in which the one side is fastened to the supporting structure ( 10 ) arranged and serving as a base plate ( 12 ) is closed. Method for disposing of radioactively contaminated parts of a boiling water reactor system, in particular of core components, in which a fuel element box stabilized according to one of the preceding claims ( 40 ) is used as a transport container. Method according to Claim 6, in which the control rod blades ( 24 ) are separated and placed in the stabilized fuel assembly box ( 40 ) are introduced. The method of claim 7, wherein the support structure the stabilized fuel assembly ( 40 ) with an internal partition ( 14 ) in at least two areas ( 42 . 44 ) which, when the sheets are inserted into one of the sub-areas ( 42 . 44 ) is supported. Device for disposing of radioactively contaminated parts of a boiling water reactor system, in particular of core components, with a fuel assembly box ( 40 ) with a supporting structure ( 10 ) is stabilized and serves as a transport container. Device according to Claim 9, in which the supporting structure ( 10 ) with a handle ( 18 ) is provided. Apparatus according to claim 9 or 10, wherein the support structure ( 10 ) a base plate ( 12 ) which comprises the fuel assembly box ( 4 ) closed on one side. Device according to claim 11, in which on the base plate ( 12 ) the supporting structure ( 10 ) at least one partition plate arranged perpendicular to it ( 14 ) is arranged, which the interior of the stabilized fuel assembly box ( 40 ) in at least two areas ( 42 . 44 ) divides.