DE2225764A1 - Intermediate storage container for a nuclear fuel assembly - Google Patents

Intermediate storage container for a nuclear fuel assembly

Info

Publication number
DE2225764A1
DE2225764A1 DE19722225764 DE2225764A DE2225764A1 DE 2225764 A1 DE2225764 A1 DE 2225764A1 DE 19722225764 DE19722225764 DE 19722225764 DE 2225764 A DE2225764 A DE 2225764A DE 2225764 A1 DE2225764 A1 DE 2225764A1
Authority
DE
Germany
Prior art keywords
storage container
intermediate storage
nuclear fuel
container according
fuel assembly
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.)
Pending
Application number
DE19722225764
Other languages
German (de)
Inventor
Jean Versailles; Merland Daniel Manosque; Geffroy (Frankreich)
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.)
Commissariat a lEnergie Atomique et aux Energies Alternatives CEA
Original Assignee
Commissariat a lEnergie Atomique CEA
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Commissariat a lEnergie Atomique CEA filed Critical Commissariat a lEnergie Atomique CEA
Publication of DE2225764A1 publication Critical patent/DE2225764A1/en
Pending legal-status Critical Current

Links

Classifications

    • 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
    • G21F5/06Details of, or accessories to, the containers
    • G21F5/10Heat-removal systems, e.g. using circulating fluid or cooling fins
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E30/00Energy generation of nuclear origin
    • Y02E30/30Nuclear fission reactors

Description

ΡΔΤΕ NTmNWALIΡΔΤΕ NTmNWALI

DR. HANS ULRICH MAY 999R7RADR. HANS ULRICH MAY 999R7RA D 8 MÖNCHEN 2, OTTOSTRASSE 1 a L· L L. Q / D HD 8 MÖNCHEN 2, OTTOSTRASSE 1 a L · L L. Q / DH

TELEaRAMME: MAYPATENT MÜNCHEN TELEFON CO81O Ö9 36B2TELEARAMME: MAYPATENT MUNICH TELEPHONE CO81O Ö9 36B2

CP 431/1086 München, den 26. Mai 1972CP 431/1086 Munich, May 26, 1972

Dr.M/rtDr M / rt

B 3903.3 PGB 3903.3 PG

Commissariat ä 1·Energie Atomique in Paris, FrankreichCommissariat ä 1 · Energie Atomique in Paris, France

Zwischenlagerbehälter für eine Kernbrennstoffkassette.Intermediate storage container for a nuclear fuel assembly.

Die Erfindung betrifft einen Zwischenlagerbehälter ("HandhabungstopP) für eine Kernbrennstoffkassette, die insbesondere in einem durch ein flüssiges Metal}., wie flüssiges Natrium, gekühlten Kernreaktor verwendbar ist.The invention relates to an intermediate storage container ("handling stopP) for a nuclear fuel assembly, in particular in a by a liquid metal}., such as liquid sodium, cooled nuclear reactor is usable.

Das System zum Entladen bestrahlter Kernbrennstoffkassetten eines solchen Kernreaktors erfordert eine Übergangszeit in einer Gasatmosphäre zwischen der Entnahme aus dem flüssigen Metall des Primärbehälters und dem Eintauchen in das flüssige Metall der sekundären Lagerung. Während dieser Zeitdauer muß eine übermäßige Erhitzungv der Kassette vermieden werden, welche die Kerhbrennstoffhüllen schädigen könnte. Die Restleistung der Kassette muß daher abgeführt werden. Zu diesem Zweck ist es bekannt, die Kassette in einen Zwischenlagerbehälter au,setzen, der mit flüssigem Metall gefüllt und auf dem Entladewagen installiert ist. Die Wärme der Brennstoffkassetten wird so durch Wärmeleitung durch das flüssige Metall bis zu den ΨΑχι* The system for unloading irradiated nuclear fuel assemblies of such a nuclear reactor requires a transition period in a gaseous atmosphere between removal from the liquid metal of the primary container and immersion in the liquid metal of the secondary storage. During this period, an excessive heating must be prevented, which could damage the Kerhbrennstoffhüllen v of the cassette. The remaining capacity of the cassette must therefore be dissipated. For this purpose it is known to put the cassette in an intermediate storage container which is filled with liquid metal and installed on the unloading trolley. The heat of the fuel assemblies is so conduction through the liquid metal up to the ΨΑχι *

den des Zwischenlagerbehälters und von dort durch Wärmestrahlung, Leitung und natürliche Konvektion an die Umgebung des Behälters abgegeben. that of the intermediate storage container and from there by thermal radiation, Conduction and natural convection given off to the surroundings of the container.

209851/0773209851/0773

Der Erfindung liegt die Aufgabe zugrunde, einen Zwischenlagerbehäter dieser Art zu schaffenr der den praktischen Anforderungen der Kerntechnik besser als die bisher bekannten Behälter entspricht, und zwar besonders durch eine wesentliche Erhöhung der abgeführten Leistung infolge einer Verbesserung des Kreislaufs des flüssigen Metalls im Behälter und einer Erhöhung der Möglichkeit der Wärmeabstrahlung von der Außenfläche des Behälters.The invention has for its object to provide a Zwischenlagerbehäter this type r is the better meets the practical requirements of nuclear technology than the previously known container, namely in particular by a significant increase in dissipated power as a result of improvement of the circulation of the liquid metal in the container and a Increasing the possibility of heat dissipation from the outer surface of the container.

Diese Aufgabe wird erfindungsgemäß gelöst durch einen Zwischenlagerbehälter für eine Kernbrennstoffkassette mit einer Einrichtung für einen Kreislauf eines Kühlmittels der Kassette, der dadurch gekenn·*· zeichnet ist, daß die Einrichtung einen zylindrischen Auöenmantel und eine doppelwandige innere Hülse, zwischen deren beiden Metallwänden eine Wärmeisolation eingeschlossen ist und deren Innenwand aus Metall mit dem notwendigen Spiel das Querschnittsprofii der Kernbrennstoffkassette umgibt, aufweist und der Auöenmantel und die innere Hülse mittels durchbrochener Bauteile mechanisch verbunden sind.According to the invention, this object is achieved by an intermediate storage container for a nuclear fuel assembly with a device for a circuit of a coolant of the assembly, which is thereby marked * is drawn is that the device has a cylindrical outer jacket and a double-walled inner sleeve, between the two metal walls of which a thermal insulation is enclosed and the inner wall of which made of metal, with the necessary clearance, the cross-sectional profile Nuclear fuel assembly surrounds, having and the outer jacket and the inner sleeve mechanically connected by means of perforated components are.

Der zylindrische Außenmantel kann aus rostfreiem Stahl bestehen, der eine Oberflächanbehancliting erhalten hat, wodurch er die Wärme durch Strahlung abführen kann, oder der mit durch Bearbeitung erhaltenen feinen Außenrippen (Wellungen) versehen ist.The cylindrical outer jacket can be made of stainless steel, the has received a surface treatment, which allows the heat to pass through Can dissipate radiation, or that obtained with processing fine outer ribs (corrugations) is provided.

Als Wärtoeisolationsmittel können Mineralwolle oder durch einen gasgefüllten Zwischenraum getrennte Metallelemente dienen. Das Kühlmittel ist ein flüssiges Metall, insbesondere Natrium.Mineral wool or a gas-filled one can be used as the insulation material Space separated metal elements are used. The coolant is a liquid metal, especially sodium.

Die Erfindung wird erläutert durch die folgende Beschreibung und die beigefügte Zeichnung einer nur als Beispiel angegebenen Ausführungsform. The invention is illustrated by the following description and the Attached drawing of an embodiment given only as an example.

In der Zeichnung zeigt die einzige Figur einen axialen Schnitt einesIn the drawing, the single figure shows an axial section of a

209851/0773209851/0773

Ausführungsbeispiels eines erfindungsgemäßen Zwischenlagerbehälters.Embodiment of an intermediate storage container according to the invention.

Wie die Figur zeigt, besteht der Zwischenlagerbehälter (Handhabungstopf) aus einem zylindrischen Außenmantel 3 aus rostfreiem Stahl. Die Außenfläche dieses Mantels ist entweder durch eine Oberflächenbehandlung oder durch Ausarbeitung feiner Rippen oder Wellen an der Oberfläche so bearbeitet, daß sie möglichst gut Wärme in die umgebende Argonatmosphäre abstrahlt. Eine innere Hülse 5 besteht aus einem Wärmeisolationsmittel 7» beispielsweise Mineralwolle oder durch einen gasgefüllten Zwischenraum getrennte Metallelemente, das zwischen zwei Metallwände 9 und 11 eingeschlossen ist. Die Innenwand 11 der Hülse ist mit dem erforderlichen mechanischen SpielAs the figure shows, the intermediate storage container (handling pot) consists of a cylindrical outer jacket 3 made of stainless steel. The outer surface of this jacket is either by a surface treatment or by processing fine ribs or waves on the Surface processed so that it radiates heat as well as possible into the surrounding argon atmosphere. An inner sleeve 5 consists of a Thermal insulation means 7 »for example mineral wool or metal elements separated by a gas-filled space, the is enclosed between two metal walls 9 and 11. The inner wall 11 of the sleeve has the necessary mechanical play

dem Querschnittsprofil der Kernbrennstoffkassette 13, 15, 17 angepaßt. Der Außenmantel 3 und die Hülse 5 sind durch durchbrochene Bauteile 19 mechanisch miteinander verbunden.the cross-sectional profile of the nuclear fuel assembly 13, 15, 17 adapted. The outer jacket 3 and the sleeve 5 are perforated Components 19 mechanically connected to one another.

Die vollständige Kernbrennstoffkassette wird in die innere Hülse 5 eingesetzt. Eine Abdichtung zwischen dem Innenraum der Hülse 5 und dem zwischen ihr und dem Außenmantel 3 liegenden Ringraum 21 erfolgt durch Berührung von Metall auf Metall am Sitz 23.The complete nuclear fuel assembly is placed in the inner sleeve 5 used. A seal between the interior of the sleeve 5 and the annular space 21 lying between it and the outer jacket 3 is effected by contact of metal on metal on the seat 23.

Die Kernbrennstoff kassette weist vier Teile auf'. Der keinen Kern-, brennstoff enthaltende Fuß 25 ist mit Bohrungen 27 für den Eintritt von Natrium in die Kassette versehen. Die untere und obere Zone 13 und 17 enthalten Brutelemente, die wenig Wärme abgeben, die Mittelzone 15 enthält die spaltbaren Elemente, wo die hauptsächliche Wärmeentwicklung auftritt.The nuclear fuel assembly has four parts. Who has no core, fuel-containing foot 25 is provided with holes 27 for the entry of sodium into the cassette. The lower and upper zone 13 and 17 contain breeding elements, which give off little heat, the middle zone 15 contains the fissile elements, where the main heat development occurs.

Der Zwischenlagerbehälter ist mit Natrium gefüllt, und es stellt sich durch Thermosiphonwirkung eine Strömung ein, wenn das Gewicht der im Ringraum 21 enthaltenen Säule größer als das der in der Kernbrennstoff kassette enthaltenen Säule von flüssigem Natrium ist. Je nach der Lage der wärmeabgebenden Zone 15 muß ein Raum 29 von aus-The intermediate storage container is filled with sodium and it represents thermosiphon effect creates a flow when the weight the column contained in the annulus 21 is larger than that in the nuclear fuel the column of liquid sodium contained in the cassette. Depending on the position of the heat-emitting zone 15, a space 29 must be

209851^0773209851 ^ 0773

reichender Länge vorgesehen sex*?, vm diese Bedingung zu erfüllen. Die bei einer gleichen flaximaltemperatur des Brennstoffs abgeführte Leistung steigt mit der Höhe dieses Raumes 29» der als Kamin wirkt. - Pas Natrium strömt dann im Mittelteil von unten nach oben und im Ringraum 21 von oben nach unten, gemäß den Pfeilen, da die beiden Säulen durch die isolierende Hülse 5 thermisch voneinander unabhängig sind.sufficient length provided sex * ?, vm to meet this condition. The power dissipated at the same minimum temperature of the fuel increases with the height of this space which acts as a chimney. - Pas sodium then flows in the middle part from bottom to top and in the annular space 21 from top to bottom, according to the arrows, since the two columns are thermally independent of one another due to the insulating sleeve 5.

Beim Einsetzen.wird der Zwischenlagerbehälter mit nur gering erhitztem Natrium von 25O°C gefüllt und bespült. Wenn die Kernbrennstoffkassette (Kernbrennstoffelementanordnung) eingesetzt ist, steigt die Temperatur örtlich im Bereich 15. Das Gewicht der Innensäule wird also allmählich kleiner als das der Ringsäule, und der Thermosiphon beginnt zu arbeiten.When inserting, the intermediate storage container is only slightly heated Sodium of 250 ° C filled and rinsed. When the nuclear fuel assembly (Nuclear fuel assembly) is inserted increases the temperature locally in the range 15. The weight of the inner column So gradually becomes smaller than that of the ring column, and the thermosiphon begins to work.

Die beschriebene Anordnung ermöglicht die Verbesserung der Strömung des Natriums, wodurch die Wand des Zwischenlagerbehälters Über ihre Höhe auf eine gleichmäßigere Temperatur so nahe wie möglich beim Höchstwert gebracht wird. Außerdem ermöglicht die Oberflächenbehandlung oder Bearbeitung des Außenmantels eine Erhöhung der Wärmeabstrahlungsfähigkeit der Außenfläche des Lagerbehälters. Da die Leistungsabgabe praktisch ausschließlich durch Strahlung erfolgt, hängt die abgegebene Leistung direkt von der Abstrahlungsfähigkeit ab und steigt von 15 kW bei den bisher bekannten Zwischenlagerbehältern auf 50 kW für den erfindungsgemäßen Zwischenlagerbehälter.The arrangement described enables the flow to be improved of sodium, which causes the wall of the intermediate storage container to be as close as possible to its height at a more uniform temperature Maximum value is brought. It also allows the surface treatment or machining of the outer jacket, an increase in the heat radiation capacity of the outer surface of the storage container. Since the The power output is practically exclusively through radiation, the output power depends directly on the radiation capacity and increases from 15 kW for the previously known intermediate storage containers to 50 kW for the intermediate storage container according to the invention.

Außerdem gestattet der erfindungsgemäße Zwtschenlagerbehälter bei einem mit schnellen Neutronen arbeitenden Kernreaktor ein Entladen bestrahlter Kernbrennstoffkassetten bereits 48 Stunden nach dem Abschalten des Reaktors. Es ergeben sich dadurch erhebliche Kostenersparnisse bereits beim Primärbehältex durch Wegfall der Innenlägerung, sowie ferner dadurch, daß '3er Brennstoff nicht mehr unbeweglich festliegt und die Lade- und Sntladezeiten des Reaktors verkürzt werden. In addition, in a nuclear reactor operating with fast neutrons, the intermediate storage container according to the invention allows irradiated nuclear fuel assemblies to be unloaded as early as 48 hours after the reactor has been switched off. This results in considerable cost savings even in the case of the primary container by eliminating the internal storage, and also because the fuel is no longer immovable and the loading and unloading times of the reactor are shortened.

209851/0773209851/0773

"* fP " "* fP"

Die Erfindung umfaßt außerdem besonders beschriebenen Ausführungsbeispiel auch alle Abwandlungen, besonders die Möglichkeit, die Aufstrom- und Abstromsäulen vollständig zu tvexm.ent den mit Thermosiphonvirkung arbeitenden Zvischenlagerbehälter schräg zu stellen und ihn für den Transport von bestrahlten Kernbrennstoffelementen mit starken Restleistungen zu verwenden.The invention also includes the particularly described embodiment and all modifications, especially the possibility of tilting the upstream and downstream columns completely to tvexm.en t the thermosiphon working intermediate storage container and to use it for the transport of irradiated nuclear fuel elements with high residual capacities.

20 985 1/077320 985 1/0773

Claims (1)

·— ··. ·— *rf ι WT· - ··. · - * rf ι WT PatentansprücheClaims My Zwischenlagerbehälter für eine Kernbrennstoff kassette mit einer Einrichtung für einen Kreislauf des Kühlmittels der Kassette» dadurch gekennzeichnet, daß die Einrichtung einen zylindrischen Außenmantel (3) und eine durch durchbrochene Bauteile (19) mechanisch damit verbundene doppelwandige innere Hülse» die aus einem zwischen zwei Metallwände (9i 11) eingeschlossenenWärmeisolationsraittel (7) besteht und deren Innenwand (11) das Profil des Querschnitts der Kernbrennstoffkassette mit dem notwendigen Spiel angepaßt umgibt» Aufweist.My intermediate storage container for a nuclear fuel assembly with a Device for circulating the coolant of the cassette »characterized in that the device has a cylindrical outer jacket (3) and a double-walled inner sleeve mechanically connected to it by perforated components (19), which consists of a between two metal walls (9i 11) enclosed heat insulation space (7) and the inner wall (11) of which surrounds the profile of the cross section of the nuclear fuel assembly with the necessary clearance » Having. a» Zwischenlagerbehälter nach Anspruch 1, dadurch gekennzeichnet, daß der zylindrische Außenmantel (3) aus rostfreiem Stahl besteht»a »Intermediate storage container according to claim 1, characterized in that that the cylindrical outer jacket (3) is made of stainless steel » 3. Zwischenlagerbehälter nach Anspruch 2» dadurch gekennzeichnet, daß die Oberfläche des zylindrischen Außenmantels (3) ftur besseren Värmeabstrahlung behandelt ist»3. Intermediate storage container according to claim 2 »characterized in that that the surface of the cylindrical outer jacket (3) for better Heat radiation is treated » 4. Zwischenlagerbehälter nach Anspruch 2. dadurch gekennzeichnet, daß der zylindrische Außenmantel (3) mit durch Bearbeitung erhaltt« mn feinen Außenrippen oder «wellen versehen ist»4. Intermediate storage container according to claim 2, characterized in that the cylindrical outer shell (3) obtained by machining « mn fine outer ribs or« is provided with waves » 5. Zwischenlagerbehälter nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet» daß das tfärneisolationsmittel eine Mineralwolle ist*5. Intermediate storage container according to one of claims 1 to 4, characterized marked »that the dyeing insulation is a mineral wool * 6* Zwischenlagerbehälter nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß das Wärmeisolationsmittel aus durch eine Gaszwischenschicht getrennten Metalleleaenten besteht.6 * Intermediate storage container according to one of claims 1 to 4, characterized characterized in that the thermal insulation means is made up of an intermediate gas layer separate metal elements. 7* Zwischenl*g«rb«hMiter nach einen der Ansprüche 1 bis 6, dadurch gekennzeichnet, daß das Kühlmittel ein flüssiges Metall, insbesondere Natrium ist.7 * Zwischenl * g «rb« hMiter according to one of claims 1 to 6, characterized characterized in that the coolant is a liquid metal, in particular sodium. 209851/0773209851/0773
DE19722225764 1971-05-28 1972-05-26 Intermediate storage container for a nuclear fuel assembly Pending DE2225764A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7119431A FR2147777B1 (en) 1971-05-28 1971-05-28

Publications (1)

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DE2225764A1 true DE2225764A1 (en) 1972-12-14

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BE (1) BE784056A (en)
CH (1) CH557575A (en)
DE (1) DE2225764A1 (en)
FR (1) FR2147777B1 (en)
GB (1) GB1332888A (en)
IT (1) IT959304B (en)

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Also Published As

Publication number Publication date
FR2147777A1 (en) 1973-03-11
IT959304B (en) 1973-11-10
BE784056A (en) 1972-09-18
FR2147777B1 (en) 1976-08-20
CH557575A (en) 1974-12-31
GB1332888A (en) 1973-10-10

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