EP1512155B1 - Method and device for disposing of a fuel element case of a boiling water reactor - Google Patents

Method and device for disposing of a fuel element case of a boiling water reactor Download PDF

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Publication number
EP1512155B1
EP1512155B1 EP03759894A EP03759894A EP1512155B1 EP 1512155 B1 EP1512155 B1 EP 1512155B1 EP 03759894 A EP03759894 A EP 03759894A EP 03759894 A EP03759894 A EP 03759894A EP 1512155 B1 EP1512155 B1 EP 1512155B1
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EP
European Patent Office
Prior art keywords
fuel assembly
assembly box
carrier structure
stabilized
fuel
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP03759894A
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German (de)
French (fr)
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EP1512155A1 (en
Inventor
Wolfgang Hummel
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Areva GmbH
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Areva NP GmbH
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Filing date
Publication date
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Publication of EP1512155A1 publication Critical patent/EP1512155A1/en
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    • GPHYSICS
    • G21NUCLEAR PHYSICS; NUCLEAR ENGINEERING
    • G21FPROTECTION AGAINST X-RADIATION, GAMMA RADIATION, CORPUSCULAR RADIATION OR PARTICLE BOMBARDMENT; TREATING RADIOACTIVELY CONTAMINATED MATERIAL; DECONTAMINATION ARRANGEMENTS THEREFOR
    • G21F5/00Transportable or portable shielded containers
    • G21F5/005Containers for solid radioactive wastes, e.g. for ultimate disposal

Definitions

  • the invention relates to a method for disposing of a fuel box.
  • the invention relates to a method and apparatus for disposing of radioactively contaminated parts of a boiling water reactor plant.
  • the wall 2 of such a fuel element box 4 encloses a substantially rectangular cavity 6.
  • the fuel box 4 is open at its ends and is only provided on a front side at opposite corners with support struts 8a, which for fixing the fuel channel 4 on serve a fuel element head, not shown in the figure.
  • the fuel channel 4 is provided in its lower region with further elements, in the example nubs 8b and outer plates 8c, which are specific to the type of box shown by way of example. In the conditioning of such a fuel element box this is usually pressed and then cut into small pieces. However, such a procedure is expensive.
  • the invention is based on the object to provide a method for disposing of a fuel assembly of a boiling water reactor system, which is simplified compared to the procedure mentioned in the prior art.
  • the invention is based on the object to provide a method for disposing of radioactively contaminated parts of a boiling water reactor system and an apparatus for performing this method.
  • the first object is achieved according to the invention with a method having the features of claim 1.
  • the fuel assembly is stabilized with a preassembled support structure by inserting the support structure into the fuel assembly.
  • the fuel channel box is closed on one of its end faces by means of a base plate arranged on the support structure and serving as a base.
  • the fuel assembly is not destroyed but provided with one or more supportive components that give it a higher strength or stability.
  • a prepared in this way for the disposal or conditioned fuel assembly can also also as a transport container for other parts to be disposed of and correspondingly conditioned parts, in particular for core components or for small-volume so-called core scrap to be used.
  • the fuel assembly is provided with a carrying handle. Thereby, it can be handled in the same way with the same facilities as they are provided for the handling of the fuel assembly.
  • the object is achieved according to the invention with the features of claim 3. Since the stabilized fuel assembly is used as a transport container for more radioactively contaminated parts, its particularly cost-effective disposal is possible together with the core scrap.
  • the leaves are separated from a control element to be disposed and introduced into the stabilized fuel assembly. Since the longitudinal and transverse expansions of the leaves of a control largely correspond to those of a fuel box these can be accommodated in a fuel box extremely space-saving, which can accommodate the leaves of three controls in this way.
  • the support structure divides the fuel assembly with an internal partition in at least two sub-areas, which is supported during insertion of the leaves in one of the sub-areas. As a result, the filling of the fuel channel is facilitated.
  • the support structure 10 comprises a base plate 12 which carries a partition plate 14 extending perpendicularly to the flat side of the base plate and in particular is welded thereto.
  • the partition plate 14 has a longitudinal extent which is greater than the longitudinal extent of the fuel channel 4 and is provided at its side facing away from the base plate 12 free end with a recess 16 so that a carrying handle 18 is formed.
  • a spacer plate 20 is fixed on this, which passes through the provided in this area with a slot 22 partition plate 14.
  • FIGS. 3a, b For this purpose, this is introduced from the bottom side into the empty fuel element box 4 until the base plate 12 closes the empty fuel element box 4 and forms a bottom. The carrying handle 18 then protrudes beyond the fuel channel 4. It can also be seen in the figure that the fuel element box 4 is subdivided by the separating plate 14 into two subregions 42, 44.
  • FIGS. 4a, b are in the stabilized with the support structure 10 fuel assembly 40 control rod blades 24 inserted, which have been separated in a previous step from to be disposed of tax bars and of which in FIG. 4b a halved by the previous decomposition bracket 26 is shown a carrying handle.
  • the spacer plate 20 serves to support the control rod blades 24 so that the space used to hold the control blade blades 24 is free from interfering internals located at the bottom of the fuel box 4. At the same time four sub-chambers 46 are formed below the control blades 24, which can be used to hold small-volume core scrap.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • High Energy & Nuclear Physics (AREA)
  • Structure Of Emergency Protection For Nuclear Reactors (AREA)
  • Monitoring And Testing Of Nuclear Reactors (AREA)
  • Processing Of Solid Wastes (AREA)

Description

Die Erfindung bezieht sich auf ein Verfahren zum Entsorgen eines Brennelementkastens. Außerdem bezieht sich die Erfindung auf ein Verfahren und eine Vorrichtung zum Entsorgen von radioaktiv kontaminierten Teilen einer Siedewasserreaktoranlage.The invention relates to a method for disposing of a fuel box. In addition, the invention relates to a method and apparatus for disposing of radioactively contaminated parts of a boiling water reactor plant.

Einbauteile einer nuklearen Reaktoranlage die mit dem Kühlwasser des Primärkreislaufes in Berührung kommen, sind erheblich radioaktiv kontaminiert und, falls sie im Reaktorkern eingebaut waren, zusätzlich aktiviert. Durch betriebsbedingten Verschleiß, dem insbesondere Kerneinbauteile im hohen Maße unterliegen, ist es erforderlich, diese Teile auszubauen und durch neue zu ersetzen. Die ausgebauten Teile müssen unter Einhaltung strenger Vorsichtsmaßnamen konditioniert werden, um sie für die Entsorgung handhabbar zu machen. Ein solches Verschleißteil ist in einem Siedewasserreaktor beispielsweise ein vollständiges Brennelement, zu dessen Vorbereitung für die Endlagerung ein Verfahren in der DE 199 47 120 A1 offenbart ist. Aber auch der durch die hohe Strahlenbelastung versprödete Brennelementkasten eines abgebrannten Brennelementes, wie er beispielsweise in Fig. 1a und b in einer Draufsicht auf die Bodenseite bzw. auf eine der Längsseiten dargestellt ist, stellt für sich gesehen ein derartiges Verschleißteil dar. Die Wand 2 eines solchen Brennelementkastens 4 umschließt einen im Wesentlichen quaderförmigen Hohlraum 6. Der Brennelementkasten 4 ist an seinen Stirnseiten offen und ist lediglich an einer Stirnseite an gegenüberliegenden Ecken mit Stützstreben 8a versehen, die zur Befestigung des Brennelementkastens 4 auf einem in der Figur nicht dargestellten Brennelementkopf dienen. Darüber hinaus ist der Brennelementkasten 4 in seinem unteren Bereich mit weiteren Elementen, im Beispiel Noppen 8b und außenliegende Platten 8c, versehen, die spezifisch für den beispielhaft dargestellten Kastentyp sind. Bei der Konditionierung eines solchen Brennelementkastens wird dieser in der Regel verpresst und anschließend in kleine Stücke zerschnitten. Eine solche Vorgehensweise ist jedoch aufwendig.Components of a nuclear reactor system which come into contact with the cooling water of the primary circuit, are considerably contaminated radioactively and, if they were installed in the reactor core, additionally activated. Due to operational wear, which in particular core components are subject to high levels, it is necessary to expand 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 is in a boiling water reactor, for example, a complete fuel element, in its preparation for disposal a method in the DE 199 47 120 A1 is disclosed. But also the embrittled by the high radiation load fuel box of a spent fuel assembly, as he, for example, in Fig. 1a and b is shown in a plan view of the bottom side or on one of the long sides, in itself represents such a wearing part. The wall 2 of such a fuel element box 4 encloses a substantially rectangular cavity 6. The fuel box 4 is open at its ends and is only provided on a front side at opposite corners with support struts 8a, which for fixing the fuel channel 4 on serve a fuel element head, not shown in the figure. In addition, the fuel channel 4 is provided in its lower region with further elements, in the example nubs 8b and outer plates 8c, which are specific to the type of box shown by way of example. In the conditioning of such a fuel element box this is usually pressed and then cut into small pieces. However, such a procedure is expensive.

Der Erfindung liegt nun die Aufgabe zu Grunde, ein Verfahren zum Entsorgen eines Brennelementkastens einer Siedewasserreaktoranlage anzugeben, das gegenüber der im Stand der Technik genannten Vorgehensweise vereinfacht ist. Außerdem liegt der Erfindung die Aufgabe zu Grunde, ein Verfahren zum Entsorgen von radioaktiv kontaminierten Teilen einer Siedewasserreaktoranlage sowie eine Vorrichtung zum Durchführen dieses Verfahrens anzugeben.The invention is based on the object to provide a method for disposing of a fuel assembly of a boiling water reactor system, which is simplified compared to the procedure mentioned in the prior art. In addition, the invention is based on the object to provide a method for disposing of radioactively contaminated parts of a boiling water reactor system and an apparatus for performing this method.

Die erstgenannte Aufgabe wird gemäß der Erfindung gelöst mit einem Verfahren mit den Merkmalen des Patentanspruches 1. Gemäß diesen Merkmalen wird der Brennelementkasten mit einer vormontierten Tragstruktur stabilisiert, indem die Tragstruktur in den Brennelementkasten eingeführt wird. Ferner wird der Brennelementkasten auf einer seiner Stirnseiten mit Hilfe einer an der Tragstruktur angeordneten und als Boden dienenden Basisplatte verschlossen. Mit anderen Worten: Der Brennelementkasten wird nicht zerstört sondern mit einem oder mehreren ihn stützenden Bauteilen versehen, die ihm eine höhere Festigkeit oder Stabilität verleihen. Damit ist ein aufwendiges Verpressen und Zerlegen des Brennelementkastens nicht mehr erforderlich und seine Entsorgung vereinfacht. Ein auf diese Weise für die Entsorgung vorbereiteter oder konditionierter Brennelementkasten kann außerdem zugleich als Transportbehälter für weitere zu entsorgende und entsprechend konditionierte Teile, insbesondere für Kerneinbauteile oder für kleinvolumigen sogenannten Core-Schrott verwendet werden.The first object is achieved according to the invention with a method having the features of claim 1. According to these features, the fuel assembly is stabilized with a preassembled support structure by inserting the support structure into the fuel assembly. Furthermore, the fuel channel box is closed on one of its end faces by means of a base plate arranged on the support structure and serving as a base. In other words, the fuel assembly is not destroyed but provided with one or more supportive components that give it a higher strength or stability. For a costly pressing and disassembly of the fuel assembly is no longer required and its disposal simplified. A prepared in this way for the disposal or conditioned fuel assembly can also also as a transport container for other parts to be disposed of and correspondingly conditioned parts, in particular for core components or for small-volume so-called core scrap to be used.

In einer vorteilhaften Ausgestaltung des Verfahrens wird der Brennelementkasten mit einem Tragegriff versehen. Dadurch kann er in gleicher Weise mit denselben Einrichtungen gehandhabt werden, wie sie für die Handhabung des Brennelementes vorgesehen sind.In an advantageous embodiment of the method, the fuel assembly is provided with a carrying handle. Thereby, it can be handled in the same way with the same facilities as they are provided for the handling of the fuel assembly.

Bezüglich des zweitgenannten Verfahrens wird die Aufgabe gemäß der Erfindung gelöst mit den Merkmalen des Patentanspruches 3. Da der stabilisierte Brennelementkasten als Transportbehälter für weitere radioaktiv kontaminierte Teile verwendet wird, ist dessen besonders kostengünstige Entsorgung gemeinsam mit dem Core-Schrott möglich.With respect to the second-mentioned method, the object is achieved according to the invention with the features of claim 3. Since the stabilized fuel assembly is used as a transport container for more radioactively contaminated parts, its particularly cost-effective disposal is possible together with the core scrap.

In einer vorteilhaften Ausgestaltung des Verfahrens werden von einem zu entsorgenden Steuerelement die Blätter abgetrennt und in den stabilisierten Brennelementkasten eingeführt. Da die Längs- und Querausdehnungen der Blätter eines Steuerelementes denen eines Brennelementkastens weitgehend entsprechen können diese äußerst platzsparend in einem Brennelementkasten untergebracht werden, der auf diese Weise die Blätter von drei Steuerelementen aufnehmen kann.In an advantageous embodiment of the method, the leaves are separated from a control element to be disposed and introduced into the stabilized fuel assembly. Since the longitudinal and transverse expansions of the leaves of a control largely correspond to those of a fuel box these can be accommodated in a fuel box extremely space-saving, which can accommodate the leaves of three controls in this way.

Insbesondere unterteilt die Tragstruktur den Brennelementkasten mit einer innenliegenden Trennwand in zumindest zwei Teilbereiche, die beim Einführen der Blätter in einen der Teilbereiche gestützt wird. Dadurch wird das Befüllen des Brennelementkastens erleichtert.In particular, the support structure divides the fuel assembly with an internal partition in at least two sub-areas, which is supported during insertion of the leaves in one of the sub-areas. As a result, the filling of the fuel channel is facilitated.

Hinsichtlich der Vorrichtung wird die genannte Aufgabe gemäß der Erfindung gelöst mit den Merkmalen des Patentanspruches 6. Vorteile der erfindungsgemäßen Vorrichtung sowie Vorteile der dem Patentanspruch 6 jeweils untergeordneten Patentansprüche ergeben sich sinngemäß aus den diesen Patentansprüchen jeweils entsprechenden Verfahrensansprüchen.With regard to the device, said object is achieved according to the invention with the features of claim 6. Advantages of the device according to the invention and advantages of the claim 6 respectively subordinate claims will become apparent mutatis mutandis from the claims corresponding to each corresponding method claims.

Zur weiteren Erläuterung der Erfindung wird auf das Ausführungsbeispiel der Zeichnung verwiesen. Es zeigen:

  • Fig. 1a und b eine Draufsicht auf die Bodenseite bzw. auf eine Längsseite eines Brennelementkastens,
  • Fig. 2a und b eine Draufsicht auf die Bodenseite bzw. auf die Längsseite einer erfindungsgemäßen Tragstruktur,
  • Fig. 3a und b eine Draufsicht auf die Stirnseite bzw. auf eine Längsseite des mit der Tragstruktur stabilisierten Brennelementkastens,
  • Fig. 4a und b eine Draufsicht auf die Stirnseite bzw. auf eine Längsseite des mit den Blättern von Steuerstäben gefüllten Brennelementkasten.
For further explanation of the invention reference is made to the embodiment of the drawing. Show it:
  • Fig. 1a and b a plan view of the bottom side or on a longitudinal side of a fuel assembly,
  • Fig. 2a and b a plan view of the bottom side or on the longitudinal side of a support structure according to the invention,
  • Fig. 3a and b a plan view of the front side or on a longitudinal side of the stabilized with the support structure fuel box,
  • Fig. 4a and b a plan view of the front side or on a longitudinal side of the filled with the leaves of control rods fuel bundle box.

Gemäß Figuren 2a, b umfasst die Tragstruktur 10 eine Basisplatte 12, die eine senkrecht zur Flachseite der Basisplatte verlaufende Trennplatte 14 trägt und insbesondere mit dieser verschweißt ist. Die Trennplatte 14 hat eine Längsausdehnung die größer ist als die Längsausdehnung des Brennelementkastens 4 und ist an ihrem von der Basisplatte 12 abgewandten freien Ende mit einer Ausnehmung 16 versehen, so dass ein Tragegriff 18 gebildet wird. Quer zur Trennplatte 14 und senkrecht zur Basisplatte 12 ist auf dieser eine Distanzplatte 20 befestigt, die die in diesem Bereich mit einem Schlitz 22 versehene Trennplatte 14 durchsetzt.According to FIGS. 2a, b For example, the support structure 10 comprises a base plate 12 which carries a partition plate 14 extending perpendicularly to the flat side of the base plate and in particular is welded thereto. The partition plate 14 has a longitudinal extent which is greater than the longitudinal extent of the fuel channel 4 and is provided at its side facing away from the base plate 12 free end with a recess 16 so that a carrying handle 18 is formed. Transverse to the partition plate 14 and perpendicular to the base plate 12, a spacer plate 20 is fixed on this, which passes through the provided in this area with a slot 22 partition plate 14.

Figuren 3a, b zeigen den mit der Tragstruktur 10 stabilisierten Brennelementkasten 40. Hierzu ist diese von der Bodenseite her in den leeren Brennelementkasten 4 eingeführt, bis die Basisplatte 12 den leeren Brennelementkasten 4 verschließt und einen Boden bildet. Der Traggriff 18 ragt dann über den Brennelementkasten 4 hinaus. In der Figur ist außerdem zu erkennen, dass der Brennelementkasten 4 durch die Trennplatte 14 in zwei Teilbereiche 42, 44 unterteilt wird. FIGS. 3a, b For this purpose, this is introduced from the bottom side into the empty fuel element box 4 until the base plate 12 closes the empty fuel element box 4 and forms a bottom. The carrying handle 18 then protrudes beyond the fuel channel 4. It can also be seen in the figure that the fuel element box 4 is subdivided by the separating plate 14 into two subregions 42, 44.

Gemäß Figuren 4a, b sind in den mit der Tragstruktur 10 stabilisierten Brennelementkasten 40 Steuerstabblätter 24 eingeführt, die in einem vorangegangenen Arbeitsschritt aus zu entsorgenden Steuerstäben herausgetrennt worden sind und von denen in Figur 4b ein durch die vorangehende Zerlegung halbierter Bügel 26 eines Tragegriffs eingezeichnet ist.According to FIGS. 4a, b are in the stabilized with the support structure 10 fuel assembly 40 control rod blades 24 inserted, which have been separated in a previous step from to be disposed of tax bars and of which in FIG. 4b a halved by the previous decomposition bracket 26 is shown a carrying handle.

Die Distanzplatte 20 dient zum Stützen der Steuerstabblätter 24, so dass der für die Aufnahme der Steuerstabblätter 24 genutzte Raum frei von störenden, im unteren Bereich des Brennelementkastens 4 befindlichen Einbauten ist. Zugleich werden unterhalb der Steuerstabblätter 24 vier Teilkammern 46 gebildet, die zur Aufnahme von kleinvolumigen Core-Schrott verwendet werden können.The spacer plate 20 serves to support the control rod blades 24 so that the space used to hold the control blade blades 24 is free from interfering internals located at the bottom of the fuel box 4. At the same time four sub-chambers 46 are formed below the control blades 24, which can be used to hold small-volume core scrap.

BezugszeichenlisteLIST OF REFERENCE NUMBERS

22
Wandwall
44
BrennelementkastenFuel channel
66
Hohlraumcavity
8a8a
Stützstrebensupport struts
8b8b
Noppeburl
8c8c
Platteplate
1010
Tragstruktursupporting structure
1212
Basisplattebaseplate
1414
Trennplatteseparating plate
1616
Ausnehmungrecess
1818
Tragegriffhandle
2020
Distanzplattespacer plate
2222
Schlitzslot
2424
SteuerstabblätterControl rod blades
2626
Bügelhanger
4040
BrennelementkastenFuel channel
42,4442.44
Teilbereichesubregions
4646
Teilkammernsubchambers

Claims (8)

  1. Method for the disposal of a fuel assembly box (4) of a boiling-water reactor system, in which the fuel assembly box (4) is stabilized with a prefabricated carrier structure (10), by the carrier structure (10) being introduced into the fuel assembly box (4) and in which a face side of the fuel assembly box (4) is closed with the aid of a base plate (12) arranged at the carrier structure (10) and serving as a base.
  2. Method according to Claim 1, in which the carrier structure (10) is provided with a carrier handle (18).
  3. Method for the disposal of radioactively contaminated parts of a boiling-water reactor system, in particular of integrated core parts, in which a fuel assembly box (40) stabilized according to any one of the preceding claims is used as a transport container.
  4. Method according to Claim 3, in which the control rod blades (24) of a control rod which is to be disposed of are separated and conveyed into the stabilized fuel assembly box (40).
  5. Method according to Claim 4, in which the carrier structure subdivides the stabilized fuel assembly box (40) with an interior partition wall (14) into at least two part areas (42, 44), which are supported on the introduction of the blades into one of the part areas (42, 44).
  6. Device for the disposal of radioactively contaminated parts of a boiling-water reactor system, in particular of integrated core components, with a fuel assembly box (40), which is stabilized with a prefabricated carrier structure (10) introduced into the fuel assembly box (40) and serves as a transport container, wherein the carrier structure (10) comprises a base plate (12) which closes the fuel assembly box (4) on one side.
  7. Device according to Claim 6, in which the carrier structure (10) is provided with a carrier handle (18).
  8. Device according to Claim 6 or 7, in which at least one partition plate (14) is arranged on the base plate (12) of the carrier structure (10) such as to be perpendicular to it, which subdivides the interior of the stabilized fuel assembly box (40) into at least two part areas (42, 44).
EP03759894A 2002-06-13 2003-05-22 Method and device for disposing of a fuel element case of a boiling water reactor Expired - Lifetime EP1512155B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10226245 2002-06-13
DE10226245A DE10226245A1 (en) 2002-06-13 2002-06-13 Method and device for disposing of a fuel assembly. Disposing of a boiling water reactor system
PCT/EP2003/005339 WO2003107356A1 (en) 2002-06-13 2003-05-22 Method and device for disposing of a fuel element case of a boiling water reactor

Publications (2)

Publication Number Publication Date
EP1512155A1 EP1512155A1 (en) 2005-03-09
EP1512155B1 true EP1512155B1 (en) 2009-04-01

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EP03759894A Expired - Lifetime EP1512155B1 (en) 2002-06-13 2003-05-22 Method and device for disposing of a fuel element case of a boiling water reactor

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EP (1) EP1512155B1 (en)
JP (1) JP2005534003A (en)
DE (2) DE10226245A1 (en)
ES (1) ES2322648T3 (en)
TW (1) TWI220992B (en)
WO (1) WO2003107356A1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5781265B2 (en) * 2009-07-31 2015-09-16 三菱重工業株式会社 Transport container for fuel assembly

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5629964A (en) * 1994-03-11 1997-05-13 Roberts; Paul Neutron absorbing apparatus
DE19728978A1 (en) * 1997-07-07 1999-01-14 Siemens Ag Gas-tight container for several used fuel elements of nuclear reactor
DE29912810U1 (en) * 1999-07-22 2000-11-23 Siemens AG, 80333 München Fuel assembly box with stop for lifting tools
DE19947120C2 (en) * 1999-09-30 2002-02-28 Framatome Anp Gmbh Process for preparing a fuel assembly for final storage and prepared fuel assembly

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Publication number Publication date
DE10226245A1 (en) 2004-01-08
DE50311371D1 (en) 2009-05-14
ES2322648T3 (en) 2009-06-24
TWI220992B (en) 2004-09-11
TW200402740A (en) 2004-02-16
WO2003107356A1 (en) 2003-12-24
EP1512155A1 (en) 2005-03-09
JP2005534003A (en) 2005-11-10

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