FR2657992A1 - Device for dissolving nuclear fuel comprising a pulsing apparatus - Google Patents

Device for dissolving nuclear fuel comprising a pulsing apparatus Download PDF

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Publication number
FR2657992A1
FR2657992A1 FR9001454A FR9001454A FR2657992A1 FR 2657992 A1 FR2657992 A1 FR 2657992A1 FR 9001454 A FR9001454 A FR 9001454A FR 9001454 A FR9001454 A FR 9001454A FR 2657992 A1 FR2657992 A1 FR 2657992A1
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FR
France
Prior art keywords
tank
liquid
nuclear fuel
dissolving
blower
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.)
Granted
Application number
FR9001454A
Other languages
French (fr)
Other versions
FR2657992B1 (en
Inventor
Lorrain Brigitte
Lefebvre Bernard
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
Priority to FR9001454A priority Critical patent/FR2657992B1/en
Priority to JP1550191A priority patent/JP2964275B2/en
Publication of FR2657992A1 publication Critical patent/FR2657992A1/en
Application granted granted Critical
Publication of FR2657992B1 publication Critical patent/FR2657992B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D21/00—Separation of suspended solid particles from liquids by sedimentation
    • B01D21/24—Feed or discharge mechanisms for settling tanks
    • B01D21/245—Discharge mechanisms for the sediments
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D21/00—Separation of suspended solid particles from liquids by sedimentation
    • B01D21/24—Feed or discharge mechanisms for settling tanks
    • B01D21/245—Discharge mechanisms for the sediments
    • B01D21/2472—Means for fluidising the sediments, e.g. by jets or mechanical agitators
    • G—PHYSICS
    • G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
    • G21C—NUCLEAR REACTORS
    • G21C19/00—Arrangements for treating, for handling, or for facilitating the handling of, fuel or other materials which are used within the reactor, e.g. within its pressure vessel
    • G21C19/42—Reprocessing of irradiated fuel
    • G21C19/44—Reprocessing of irradiated fuel of irradiated solid fuel
    • Y—GENERAL 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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E30/00—Energy generation of nuclear origin
    • Y02E30/30—Nuclear fission reactors
    • Y—GENERAL 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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00—Technologies for solid waste management
    • Y02W30/50—Reuse, recycling or recovery technologies

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • General Engineering & Computer Science (AREA)
  • High Energy & Nuclear Physics (AREA)
  • Jet Pumps And Other Pumps (AREA)
  • Mixers Of The Rotary Stirring Type (AREA)
  • Cleaning By Liquid Or Steam (AREA)

Abstract

Device for dissolving nuclear fuel, comprising a liquid-filled vessel (1) with a bottom (4) sloping along the length of the vessel; a device (5) for removing undissolved solid particles opens out in front of the lowest point (6) of the bottom. A liquid-pulsing apparatus (7) is incorporated, which has an opening (9) close to the bottom and pointing with a slightly higher inclination: the liquid delivered by the pulser thus moves the solid particles deposited on the bottom and collects them under the device for removal (5).

Description

DISPOSITIF DE DISSOLUTION DE COMBUSTIBLE NUCLEAIRE
COMPRENANT UN APPAREIL PULSEUR
DESCRIPTION
L'invention se rapporte à un dispositif de dissolution de combustible nucléaire comprenant une cuve dans laquelle un appareil pulseur est plongé.NUCLEAR FUEL DISSOLUTION DEVICE
INCLUDING A PULSE APPARATUS
DESCRIPTION
The invention relates to a device for dissolving nuclear fuel comprising a tank in which a blower device is immersed.

Les brevets français 2 474 347 et 88 13931 décrivent des dispositifs de dissolution de combustible nucléaire dans lesquels la dissolution s'effectue dans une cuve remplie d'un Liquide. Cette cuve est plate, c'est-à-dire que sa largeur est beaucoup plus faible que sa longueur, et elle présente un fond incliné dans
Le sens de la Longueur d'une extrémité longidutinale à
L'autre. Cette disposition permet à des particules solides fines qui ne sont pas dissoutes de glisser sur le fond après s'être déposées et de parvenir au point
Le plus bas du fond où elles sont aspirées par un élévateur à bulles avant d'être évacuées vers un autre appareil.French patents 2,474,347 and 88,13931 describe devices for dissolving nuclear fuel in which the dissolution takes place in a tank filled with a liquid. This tank is flat, that is to say that its width is much smaller than its length, and it has an inclined bottom in
The direction of the length from one longitudinal end to
The other. This arrangement allows fine solid particles which are not dissolved to slide on the bottom after being deposited and to reach the point
The bottom of the bottom where they are sucked by a bubble elevator before being evacuated to another device.

On a toutefois constaté que Le mouvement de gLissement des particules sur le fond incliné et de rassemblement sous l'élévateur à bulles n'est pas complet, si bien que les particules ne sont pas toutes récupérées. However, it has been found that the movement of sliding of the particles on the inclined bottom and of gathering under the bubble elevator is not complete, so that the particles are not all recovered.

On a cherché, en proposant cette invention, à résoudre le probLème d'obtenir une évacuation complète des particules solides tombées dans le liquide puis au fond de la cuve. We have sought, by proposing this invention, to solve the problem of obtaining a complete evacuation of solid particles fallen into the liquid and then to the bottom of the tank.

On se sert pour cela d'un appareil pulseur déjà utilisé dans des cuves rempLies de liquide, mais uniquement afin d'obtenir une solution homogène en brassant Le liquide. Ce pulseur est dans ce cas conçu de manière que son action de brassage ne s'accompagne pas d'une dispersion des particules déposées mais au contraire d'un mouvement cohérent de rassemblement de ces particules au-dessous du dispositif de soutirage constitue par l'elévateur à bulles. To do this, we use a pulsating device already used in tanks filled with liquid, but only in order to obtain a homogeneous solution by stirring the liquid. This blower is in this case designed so that its stirring action is not accompanied by a dispersion of the deposited particles but, on the contrary, by a coherent movement of gathering of these particles below the withdrawal device constituted by the bubble elevator.

L'appareil pulseur présente une embouchure cyLindrique proche du fond, orientée en direction du point le plus bas du fond et inclinée dans La même direction que le fond de la cuve avec une inclinaison légèrement supérieure. The blower unit has a cylindrical mouth near the bottom, oriented towards the lowest point of the bottom and inclined in the same direction as the bottom of the tank with a slightly higher inclination.

L'embouchure cylindrique a une longueur suffisante pour canaliser le jet expulsé du pulseur. The cylindrical mouthpiece is long enough to channel the jet expelled from the blower.

L'invention va à présent être décrite plus concrètement à l'aide des deux figures suivantes annexées à titre illustratif et non limitatif, parmi lesquelles la figure 1 représente une vue générale du dispositif et la figure 2 un détail en perspective du dispositif. The invention will now be described more concretely with the aid of the following two figures annexed by way of illustration and not limitation, among which FIG. 1 represents a general view of the device and FIG. 2 a detail in perspective of the device.

La cuve de dissolution du combustibLe nucléaire est référencée par 1 sur la figure 1. La cuve 1 est vue en direction latérale. Le dispositif de dissolution est complété essentiellement par une roue (non représentée) plongeant partiellement dans te dissolvant et munie de godets percés contenant des tronçons de combustible nucléaire et qui plongent dans
Le dissolvant sur une partie des révolutions de La roue.The nuclear fuel dissolving tank is referenced by 1 in Figure 1. The tank 1 is viewed in the lateral direction. The dissolving device is essentially completed by a wheel (not shown) partially dipping into the dissolver and provided with drilled cups containing sections of nuclear fuel and which plunge into
The solvent on part of the revolutions of The wheel.

La cuve 1 comprenant entre deux parois opposées longitudinales 2 et 3 un fond incliné 4 et, à proximité de La paroi Latérale 3, un élévateur à bulles 5 dont l'extrémité inférieure aspire dans la zone 6 correspondant au point Le plus bas de la cuve 1. The tank 1 comprising between two opposite longitudinal walls 2 and 3 an inclined bottom 4 and, near the side wall 3, a bubble elevator 5 whose lower end sucks in the zone 6 corresponding to the lowest point of the tank 1.

Un appareil pulseur 7 est disposé près du fond incliné 4 ainsi que de la paroi latérale 2. Il comprend essentiellement une enveloppe 8 terminée à une extrémité orientée vers L'éLévateur à bulles 5 par une embouchure 9 et à l'autre extrémité par une canalisation 10. En s'éloignant du pulseur 7, on trouve successivement sur la canalisation 10 un embranchement 11, une électrovanne d'admission 12, un ballon 13 équipé d'un manomètre, une électrovanne de remplissage 14,-un détendeur 15 et une source d'air comprimé 16. L'embranchement 11 correspond à la jonction avec une canalisation d'échappement 17 munie d'une électrovanne d'échappement 18 et qui aboutit au circuit d'échappement 19 de la cuve 1, en amont de l'appareil 20 de lavage des gaz. A blower device 7 is disposed near the inclined bottom 4 as well as the side wall 2. It essentially comprises a casing 8 terminated at one end oriented towards the bubble elevator 5 by a mouth 9 and at the other end by a pipe 10. Moving away from the blower 7, there is successively on the pipe 10 a branch 11, an inlet solenoid valve 12, a balloon 13 equipped with a pressure gauge, a filling solenoid valve 14, a regulator 15 and a source of compressed air 16. The branch 11 corresponds to the junction with an exhaust pipe 17 provided with an exhaust solenoid valve 18 and which terminates in the exhaust circuit 19 of the tank 1, upstream of the apparatus 20 gas washing.

En fonctionnement normal, l'électrovanne de remplissage 14 et l'électrovanne d'échappement 18 sont ouvertes mais llélectrovanne d'admission 12 est fermée. In normal operation, the filling solenoid valve 14 and the exhaust solenoid valve 18 are open but the inlet solenoid valve 12 is closed.

Quand on veut réaliser une pulsation, les trois électrovannes 12, 14 et 18 sont commutées, si bien que l'air du ballon 13 pénètre par La canalisation 10 dans le pulseur 7. Le liquide contenu dans Le pulseur 7 est partiellement orienté dans la cuve 1, sous La forme d'un jet légèrement rentré vers le fond incliné,. Quand le système revient à son état initial, l'égalisation des pressions force du liquide à rentrer de nouveau dans le pulseur 7 tout en chassant L'air du pulseur 7 vers l'extérieur. L'air emplissant le ballon 13 est en quantité choisie de sorte que, quand il entre dans le pulseur 7, il ne le remplit pas en entier, ce qui empeche l'apparition de bulles dans la cuve 1.When it is desired to carry out a pulsation, the three solenoid valves 12, 14 and 18 are switched, so that the air in the balloon 13 penetrates via the pipe 10 into the blower 7. The liquid contained in the blower 7 is partially oriented in the tank 1, in the form of a jet slightly returned to the inclined bottom ,. When the system returns to its initial state, the pressure equalization forces the liquid to re-enter the blower 7 while expelling the air from the blower 7 to the outside. The air filling the balloon 13 is in a chosen quantity so that, when it enters the blower 7, it does not fill it entirely, which prevents the appearance of bubbles in the tank 1.

Le pulseur 7 a une forme coudée et se compose
dans cette réalisation d'une partie amont 21 attenante à la canalisation 10, d'une partie aval 22 attenante à
L'embouchure 9 et d'une partie de raccordement 23 entre les deux précédentes 21 et 22. La partie aval 22 se rétrécit progressivement en direction de l'embouchure 9.Pulser 7 has an angled shape and consists of
in this embodiment of an upstream part 21 adjoining the pipe 10, of a downstream part 22 adjoining
The mouth 9 and of a connection part 23 between the two preceding ones 21 and 22. The downstream part 22 gradually narrows in the direction of the mouth 9.

Comme on le voit sur la figure 2, l'embouchure 9 est cylindrique avec, si nécessaire, une section aplatie qui s'étend sur l'essentiel de la largeur de la cuve 1. As can be seen in FIG. 2, the mouth 9 is cylindrical with, if necessary, a flattened section which extends over most of the width of the tank 1.

Le pulseur 7 est accroché à la cuve 1 (par des moyens non représentés) de sorte que l'embouchure 9 est à faible distance du fond incliné 4, orientée vers la zone 6 avec une inclinaison un peu supérieure à celle du fond incliné 4 et dans le même sens. The blower 7 is hooked to the tank 1 (by means not shown) so that the mouth 9 is a short distance from the inclined bottom 4, oriented towards the area 6 with an inclination slightly greater than that of the inclined bottom 4 and in the same way.

L'embouchure 9 et le fond incliné 4 forment ainsi un petit angLe a, inférieur à une dizaines de degrés et de 3 à 40 dans la réalisation représenté. Ces diverses dispositions permettent d'éjecter le liquide pulsé en direction du fond incliné 4 de manière à déplacer les particules solides déposées et a les entratner vers le point le plus bas 6, mais avec une douceur suffisante pour ne pas les remettre en suspension dans le reste du liquide. Ce phénomène est renforcé si la paroi inférieure 24 de la partie aval 22 est dans le prolongement de La partie inférieure 25 de la paroi de
L'embouchure 9. The mouth 9 and the inclined bottom 4 thus form a small angle, less than a tens of degrees and from 3 to 40 in the embodiment shown. These various arrangements make it possible to eject the pulsed liquid in the direction of the inclined bottom 4 so as to move the solid particles deposited and to entrain them towards the lowest point 6, but with sufficient softness not to resuspend them in the rest of the liquid. This phenomenon is reinforced if the lower wall 24 of the downstream part 22 is an extension of the lower part 25 of the wall of
The mouth 9.

Claims (2)

REVENDICATIONS 1. Dispositif de dissolution de combustible nucléaire comprenant une cuve (1) de liquide à fond incliné (4) suivant la longueur de la cuve, un dispositif d'enlèvement (5) de particules solides non dissoutes au point Le plus bas (6) du fond (4), et caractérisé par un appareil pulseur (7S plongé dans le liquide et qui présente une embouchure cylindrique (9) proche du fond (4), orientée vers le point le plus bas (6) de la cuve, et inclinée dans la même direction que le fond de la cuve avec une inclinaison légèrement supérieure. 1. Device for dissolving nuclear fuel comprising a tank (1) of liquid with an inclined bottom (4) along the length of the tank, a device for removing (5) solid particles not dissolved at the lowest point (6) bottom (4), and characterized by a pulsating device (7S immersed in the liquid and which has a cylindrical mouth (9) close to the bottom (4), oriented towards the lowest point (6) of the tank, and inclined in the same direction as the bottom of the tank with a slightly higher inclination. 2. Dispositif de disolution de combustible nucléaire selon la revendication 1, caractérisé en ce que l'appareil pulseur comprend une paroi inférieure (24) prolongeant la partie inférieure (25) de la paroi de l'embouchure (8).  2. A nuclear fuel dissolving device according to claim 1, characterized in that the blower device comprises a lower wall (24) extending the lower part (25) of the wall of the mouth (8).
FR9001454A 1990-02-08 1990-02-08 NUCLEAR FUEL DISSOLUTION DEVICE INCLUDING A PULSING APPARATUS. Expired - Lifetime FR2657992B1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
FR9001454A FR2657992B1 (en) 1990-02-08 1990-02-08 NUCLEAR FUEL DISSOLUTION DEVICE INCLUDING A PULSING APPARATUS.
JP1550191A JP2964275B2 (en) 1990-02-08 1991-02-06 Nuclear fuel melting device with built-in pulsation device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR9001454A FR2657992B1 (en) 1990-02-08 1990-02-08 NUCLEAR FUEL DISSOLUTION DEVICE INCLUDING A PULSING APPARATUS.

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FR2657992A1 true FR2657992A1 (en) 1991-08-09
FR2657992B1 FR2657992B1 (en) 1993-11-12

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FR9001454A Expired - Lifetime FR2657992B1 (en) 1990-02-08 1990-02-08 NUCLEAR FUEL DISSOLUTION DEVICE INCLUDING A PULSING APPARATUS.

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FR (1) FR2657992B1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999063545A2 (en) * 1998-06-03 1999-12-09 British Nuclear Fuels Plc Apparatus for dissolving nuclear fuel
CN111883275A (en) * 2020-07-22 2020-11-03 中国核电工程有限公司 Continuous deslagging method and system

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2267608A (en) * 1941-12-23 Sewage sedimentation system
DE893595C (en) * 1951-12-29 1953-10-19 Adalbert Besta Process for loosening and removing deposits and deposits in sewers and pipes
EP0030884A1 (en) * 1979-12-18 1981-06-24 COMMISSARIAT A L'ENERGIE ATOMIQUE Etablissement de Caractère Scientifique Technique et Industriel Apparatus for treating compounds in a liquid
EP0257298B1 (en) * 1986-08-01 1991-01-16 KSB Aktiengesellschaft Method and device for the cleaning of liquid containers

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2267608A (en) * 1941-12-23 Sewage sedimentation system
DE893595C (en) * 1951-12-29 1953-10-19 Adalbert Besta Process for loosening and removing deposits and deposits in sewers and pipes
EP0030884A1 (en) * 1979-12-18 1981-06-24 COMMISSARIAT A L'ENERGIE ATOMIQUE Etablissement de Caractère Scientifique Technique et Industriel Apparatus for treating compounds in a liquid
FR2474347A1 (en) * 1979-12-18 1981-07-31 Commissariat Energie Atomique APPARATUS FOR TREATING COMPOUNDS IN A LIQUID
EP0257298B1 (en) * 1986-08-01 1991-01-16 KSB Aktiengesellschaft Method and device for the cleaning of liquid containers

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999063545A2 (en) * 1998-06-03 1999-12-09 British Nuclear Fuels Plc Apparatus for dissolving nuclear fuel
WO1999063545A3 (en) * 1998-06-03 2000-01-27 British Nuclear Fuels Plc Apparatus for dissolving nuclear fuel
CN111883275A (en) * 2020-07-22 2020-11-03 中国核电工程有限公司 Continuous deslagging method and system
CN111883275B (en) * 2020-07-22 2023-04-07 中国核电工程有限公司 Continuous deslagging method and system

Also Published As

Publication number Publication date
JP2964275B2 (en) 1999-10-18
FR2657992B1 (en) 1993-11-12
JPH05150085A (en) 1993-06-18

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