EP0106959B2 - Procédé et installation pour enlever les dépôts sur les surfaces des composants d'une installation nucléaire refroidie à l'eau - Google Patents

Procédé et installation pour enlever les dépôts sur les surfaces des composants d'une installation nucléaire refroidie à l'eau Download PDF

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Publication number
EP0106959B2
EP0106959B2 EP83107922A EP83107922A EP0106959B2 EP 0106959 B2 EP0106959 B2 EP 0106959B2 EP 83107922 A EP83107922 A EP 83107922A EP 83107922 A EP83107922 A EP 83107922A EP 0106959 B2 EP0106959 B2 EP 0106959B2
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EP
European Patent Office
Prior art keywords
container
water
fuel assembly
cleaning
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
EP83107922A
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German (de)
English (en)
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EP0106959A3 (en
EP0106959A2 (fr
EP0106959B1 (fr
Inventor
Rainer Ing.Grad. Scharpenberg
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.)
ABB Reaktor GmbH
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ABB Reaktor GmbH
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Application filed by ABB Reaktor GmbH filed Critical ABB Reaktor GmbH
Publication of EP0106959A2 publication Critical patent/EP0106959A2/fr
Publication of EP0106959A3 publication Critical patent/EP0106959A3/de
Publication of EP0106959B1 publication Critical patent/EP0106959B1/fr
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    • G—PHYSICS
    • G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
    • G21F—PROTECTION AGAINST X-RADIATION, GAMMA RADIATION, CORPUSCULAR RADIATION OR PARTICLE BOMBARDMENT; TREATING RADIOACTIVELY CONTAMINATED MATERIAL; DECONTAMINATION ARRANGEMENTS THEREFOR
    • G21F9/00—Treating radioactively contaminated material; Decontamination arrangements therefor
    • G21F9/001—Decontamination of contaminated objects, apparatus, clothes, food; Preventing contamination thereof

Definitions

  • the invention relates to a device for cleaning the surface of a nuclear reactor fuel element, which is arranged in a liquid-filled container, the container on the periphery carrying a plurality of ultrasonic vibrators, the sound waves of which are directed towards the fuel element.
  • EP-A 01 02 048 which falls under Art. 54 (3) EPC, discloses a water basin for storing nuclear reactor fuel elements. There, during its lowering process, the fuel assembly is guided past an ultrasonic oscillator in a shaft comparable to a container, which is arranged at the upper end of the shaft. A suction line leads from the lower end of the shaft, through which shaft water provided with dirt particles is passed through a filter arranged outside the water basin and then returned to the water basin. This design requires additional shielding measures for the filter. In EP-A 01 02 048 only a single ultrasonic vibrator is specified, which is to be arranged at the upper end of the shaft. None is said about its positioning.
  • the nuclear reactor fuel element is arranged in a container closed with a lid, in that the ultrasound transducers are attached to at least two opposite outer sides of the water-filled container arranged in a water basin, in that the ultrasound transducers in each case on a common one
  • the central axis is that the container is provided with a line for circulating the water inside it and that a circulating pump and a filter are connected in series in the line.
  • the forces acting on the fuel element cancel each other out, so that damage is reliably avoided.
  • the deposition particles that occur during the cleaning process are filtered out, so that there is no impairment of the ultrasound intensity or contamination of the water surrounding the container.
  • a device for checking the degree of purity of the water leaving the container is provided in the line assigned to the container in the flow direction in front of the filter. As soon as a predefined level of purity of the water has been reached, the sonication process is ended.
  • the fuel element remains in the container after the cleaning process has been completed and is subjected to a sipping test there.
  • FIG. 1 shows a partial area of a water basin 1, which is used to store spent fuel elements while maintaining sufficient shielding conditions by the water. As is known, this requires a layer of water that still has a thickness of several meters above the stored fuel elements.
  • a container 3 for receiving a fuel element 4 of water-cooled nuclear reactors.
  • the completely assembled fuel element 4 was already inserted in the reactor core and, after removal of the deposits adhering to the surfaces of its components, should be checked for its reusability in the reactor core. It consists of the foot 5 and the head piece 6, which are connected to one another via control rod guide tubes (not shown) and form the framework of the fuel assembly.
  • cladding tubes 7 Between the foot and the head piece extends a plurality of approximately four meter long cladding tubes 7, which contain a large number of fuel tablets made of uranium dioxide and are closed at their ends with end plugs, not shown.
  • the fuel tablets and the spacer grids which are equipped with delicate springs, are exposed to harmful loads due to the high-energy frequencies required for cleaning. Due to the simultaneous sonication with ultrasound transducers of the same power arranged opposite one another, the forces acting on the components of the fuel assembly are mutually canceled or at least reduced. As can be seen from Fig.
  • each transducer plate carries nine ultrasonic transducers 14 with the same power and the same geometric arrangement. In each case four pairs of oscillating plates 13 lying opposite one another are arranged at the same height, so that the ultrasonic oscillators 14 carried by them lie opposite one another.
  • the container is equipped with three times four such oscillating plates, which, viewed in their vertical extension, are at such a distance from one another that the surfaces of the fuel element are optimally cleaned.
  • a holding element 16 equipped with swivel joints 15 carries a hydraulically actuated cylinder 17 and is fastened with its one end 18 to the container 3 and with its other end 19 to a cover 20 for closing the container 3.
  • the control lines 21 of the cylinder 17 are connected to a control unit 22 located outside the water basin 1, so that the cover 20 can be opened or closed remotely with a fuel element for loading or unloading the container.
  • the ultrasonic transducers are also operated by the control unit, as indicated by the connecting line 23. So that the deposit particles already removed due to the action of ultrasound and present in the water arranged inside the container do not disturb the cleaning process, the container has a line 26 provided with a filter and a circulation pump.
  • the line 26 is connected at one end in the vicinity of the container bottom 27 and at the other end in the vicinity of the lid 20 to the container 3.
  • the circulating pump 25 circulates the water in the container and required for ultrasonic cleaning, so that particles contained therein are retained in the filter 24.
  • the device described in FIGS. 1 and 1a is particularly advantageous if a sipping container which is usually known in water-cooled reactor plants is used as the container 3.
  • the sipping container also receives a fuel assembly. Due to the effect of the post-decay heat, radioactive fission products escape into the container water from defective cladding tubes. A water test then reveals whether the cladding tubes of the fuel assembly are defective and need to be replaced.
  • Such a sipping container would only have to be strengthened with ultrasonic vibrators 14 and the line 26 in order to be usable additionally for ultrasonic cleaning. With such a combined application, it is advantageous to carry out the ultrasonic cleaning first and only then to carry out the sipping test.
  • the invention relates to a device for cleaning the surface of a nuclear reactor fuel element, which is arranged in a liquid-filled container, the container on the periphery carrying a plurality of ultrasonic vibrators, the sound waves of which are directed towards the fuel element.
  • the ultrasonic vibrators are attached to at least two opposite outer sides of the water-filled container arranged in a water basin, that the respectively opposite ultrasonic vibrators lie on a common central axis, that the container has a line for circulating the inside the same water is provided and that in the line a circulation pump and a filter are connected in series.
  • the forces acting on the fuel element cancel each other out, so that damage is reliably avoided.
  • the deposition particles that occur during the cleaning process are filtered out, so that there is no impairment of the ultrasound intensity or contamination of the water surrounding the container.
  • the fuel assembly can be arranged in an open-top or in a closed container.
  • a device for checking the degree of purity of the water leaving the container is provided in the line assigned to the container in the flow direction in front of the filter. As soon as a predefined level of purity of the water has been reached, the sonication process is ended.
  • the fuel element remains in the container after the cleaning process has been completed and is subjected to a sipping test there.
  • FIG. 1 shows a partial area of a water basin 1, which is used to store spent fuel elements while maintaining sufficient shielding conditions by the water. As is known, this requires a layer of water that still has a thickness of several meters above the stored fuel elements.
  • a container 3 for receiving a fuel element 4 of water-cooled nuclear reactors.
  • the completely assembled fuel element 4 was already inserted in the reactor core and, after removal of the deposits adhering to the surfaces of its components, should be checked for its reusability in the reactor core. It consists of the foot 5 and the head piece 6, which are connected to one another via control rod guide tubes (not shown) and form the framework of the fuel assembly.
  • cladding tubes 7 Between the foot and the head piece extends a plurality of approximately four meter long cladding tubes 7, which contain a large number of fuel tablets made of uranium dioxide and are closed at their ends with end plugs, not shown.
  • the fuel tablets and the spacer grids which are equipped with delicate springs, are exposed to harmful loads due to the high-energy frequencies required for cleaning. Due to the simultaneous sonication with ultrasound transducers of the same power arranged opposite one another, the forces acting on the components of the fuel assembly are mutually canceled or at least reduced. As can be seen from Fig.
  • each transducer plate carries nine ultrasonic transducers 14 with the same power and the same geometric arrangement. In each case four pairs of oscillating plates 13 lying opposite one another are arranged at the same height, so that the ultrasonic oscillators 14 carried by them lie opposite one another.
  • the container is equipped with three times four such oscillating plates, which, viewed in their vertical extension, are at such a distance from one another that the surfaces of the fuel element are optimally cleaned.
  • a holding element 16 equipped with swivel joints 15 carries a hydraulically actuated cylinder 17 and is fastened with its one end 18 to the container 3 and with its other end 19 to a cover 20 for closing the container 3.
  • the control lines 21 of the cylinder 17 are connected to a control unit 22 located outside the water basin 1, so that the cover 20 can be opened or closed remotely with a fuel element for loading or unloading the container.
  • the ultrasonic transducers are also operated by the control unit, as indicated by the connecting line 23. So that the deposit particles already removed due to the action of ultrasound and present in the water arranged inside the container do not disturb the cleaning process, the container has a line 26 provided with a filter and a circulation pump.
  • the line 26 is connected at one end in the vicinity of the container bottom 27 and at the other end in the vicinity of the lid 20 to the container 3.
  • the circulating pump 25 circulates the water in the container and required for ultrasonic cleaning, so that particles contained therein are retained in the filter 24.
  • the device described in FIGS. 1 and 1a is particularly advantageous if a sipping container which is usually known in water-cooled reactor plants is used as the container 3.
  • the sipping container also receives a fuel assembly. Due to the effect of the post-decay heat, radioactive fission products escape into the container water from defective cladding tubes. A water test then reveals whether the cladding tubes of the fuel assembly are defective and need to be replaced.
  • Such a sipping container would only have to be strengthened with ultrasonic vibrators 14 and the line 26 in order to be usable additionally for ultrasonic cleaning. With such a combined application, it is advantageous to carry out the ultrasonic cleaning first and only then to carry out the sipping test.
  • Fig. 2 shows another embodiment of a device.
  • the container 3 is made of steel and is open at its top 30. Its side walls 9a, 10a, 11a, 12a are so high that a third of the height of the fuel assembly is immersed in the container.
  • the opening cross section of the The container is so large that there is a gap of approx. 50 millimeters between the inside of the container and the cladding tubes arranged on the periphery of the fuel assembly.
  • an oscillating plate 13 is fastened in the same geometrical arrangement, each carrying nine ultrasonic oscillators 14.
  • at least the ultrasound transducers 14 arranged opposite one another lie on a common center axis 31.
  • the ultrasound transducers arranged approximately at right angles to one another can also assume a different altitude. This increases the total volume of sound and improves cleaning. So that the removed deposit particles do not get into the water basin 1, a line 32 leads away from the container 3 in the vicinity of the container bottom 27 and opens with its free end 23 into the water basin 1. Due to the circulation pump 25 arranged in the line 32, the pool water contained in the container 3 is constantly renewed.
  • the filter 24 installed in line with the circulation pump 25 in the line 32 retains the deposition particles.
  • a device 29 for checking the degree of purity of the water leaving the sipping test is provided in front of the filter 24 in the flow direction.
  • the ultrasonic vibrators 14 and the circulation pump 25 can be operated remotely via a control device (not shown) arranged outside the water basin.

Claims (4)

1. Dispositif pour le nettoyage des surfaces d'un assemblage combustible (4) de réacteur nucléaire qui est installé dans une cuve (3) remplie de liquide, la cuve (3) portant sur sa périphérie plusieurs émetteurs d'ultrasons (14) dont les ondes sonores sont dirigées sur l'assemblage combustible (4), caractérisé par le fait que l'assemblage combustible (4) est installé dans une cuve (3) fermée le couvercle (20) que les émetteurs d'ultrasons (14) sont fixés sur au moins deux côtés extérieurs opposés (9, 12) de la cuve (3) remplie d'eau placée dans une piscine (1), que les émetteurs d'ultrasons (14) respectivement opposés sont situés sur un axe médian commun (31), que la cuve (3) est munie d'une conduite (26, 32) pour la circulation de l'eau se trouvant à l'intérieur de celle-ci et qu'une pompe de circulation (25) et un filtre (24) sont montés en série dans la conduite (26, 32).
2. Dispositif selon la revendication 1, caractérisé par le fait qu'un dispositif (29) pour la surveillance du degré de pureté de l'eau quittant la cuve (3) est installé dans la conduite (26, 32) devant le filtre (24) vu dans le sens de l'écoulement.
3. Procédé pour le nettoyage des surfaces d'un assemblage combustible (4) de réacteur nucléaire avec emploi d'un dispositif selon les revendications 1 à 2 caractérisé par le fait qu'à partir de côtés opposés, on soumet simultanément l'assemblage combustible (4) à l'action d'ultrasons au moyen d'émetteurs d'ultrasons (14) de même puissance et que l'on fait circuler l'eau de la cuve pendant le processus de nettoyage.
4. Procédé selon la revendication 3, caractérisé par le fait qu'à la fin du processus de nettoyage, on laisse l'assemblage combustible (4) dans la cuve (3) et on le soumet à un sipping-test.
EP83107922A 1982-10-21 1983-08-11 Procédé et installation pour enlever les dépôts sur les surfaces des composants d'une installation nucléaire refroidie à l'eau Expired - Lifetime EP0106959B2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19823238886 DE3238886A1 (de) 1982-10-21 1982-10-21 Verfahren und einrichtung zum entfernen von ablagerungen auf den oberflaechen der bauteile einer wassergekuehlten kernreaktoranlage
DE3238886 1982-10-21

Publications (4)

Publication Number Publication Date
EP0106959A2 EP0106959A2 (fr) 1984-05-02
EP0106959A3 EP0106959A3 (en) 1984-06-13
EP0106959B1 EP0106959B1 (fr) 1987-04-22
EP0106959B2 true EP0106959B2 (fr) 1992-04-15

Family

ID=6176183

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83107922A Expired - Lifetime EP0106959B2 (fr) 1982-10-21 1983-08-11 Procédé et installation pour enlever les dépôts sur les surfaces des composants d'une installation nucléaire refroidie à l'eau

Country Status (3)

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EP (1) EP0106959B2 (fr)
DE (2) DE3238886A1 (fr)
ES (1) ES525367A0 (fr)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2586322B1 (fr) * 1985-08-14 1990-05-18 Framatome Sa Procede de nettoyage et de decontamination par ultrasons d'enceintes et dispositif correspondant
FR2590716B1 (fr) * 1985-11-26 1992-05-15 Electricite De France Procede de decontamination de parois de reacteurs nucleaires, en particulier des parois du circuit primaire des reacteurs nucleaires a circuit d'eau pressurisee
US5092355A (en) * 1988-12-15 1992-03-03 Westinghouse Electric Corp. Pressure pulse method for removing debris from nuclear fuel assemblies
US5002079A (en) * 1988-12-15 1991-03-26 Westinghouse Electric Corp. Pressure pulse method and system for removing debris from nuclear fuel assemblies
IT1232632B (it) * 1989-09-21 1992-02-28 Ente Naz Energia Elettrica Processo di decontaminazione totale di materiali metallici radioattivi.
DE4012467A1 (de) * 1990-04-19 1991-10-24 D T I Dr Trippe Ingenieurgesel Vorrichtung und verfahren zum reinigen von oberflaechen mittels ultraschall
DE4129362A1 (de) * 1991-09-04 1992-05-14 Ulrich Nestler Anordnung und verfahren einer autonomen brennelement-spueleinrichtung
DE19603902C2 (de) * 1996-02-03 1999-06-17 Tzn Forschung & Entwicklung Verfahren und Anordnung zum Ablösen von Rückständen insbesondere zur Dekontaminierung in kerntechnischen Anlagen
CN107303573B (zh) * 2016-04-21 2020-04-14 国投生物科技投资有限公司 一种光生物反应器的清洗装置

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL221303A (fr) * 1956-10-04
US3001769A (en) * 1959-02-27 1961-09-26 Phillips Mfg Company Ultrasonic degreaser
US3222221A (en) * 1959-04-29 1965-12-07 Branson Instr Ultrasonic cleaning method and apparatus
US3240963A (en) * 1962-01-04 1966-03-15 Coal Res Inst Apparatus for generating ultrasonic vibrations in liquids
US3464672A (en) * 1966-10-26 1969-09-02 Dynamics Corp America Sonic processing transducer
NL7505936A (nl) * 1975-05-21 1976-11-23 Skf Ind Trading & Dev Reinigingsinrichting voor werktuigkundige voor- werpen.
US4071376A (en) * 1975-09-08 1978-01-31 Mcneer Larry M Ultrasonic cleaning with floating transducers
CH619807A5 (fr) * 1976-04-07 1980-10-15 Foerderung Forschung Gmbh
US4311157A (en) * 1980-02-26 1982-01-19 Rock Oil Corporation Sonic treating apparatus

Also Published As

Publication number Publication date
EP0106959A3 (en) 1984-06-13
EP0106959A2 (fr) 1984-05-02
EP0106959B1 (fr) 1987-04-22
DE3238886A1 (de) 1984-04-26
DE3238886C2 (fr) 1991-01-03
DE3371138D1 (en) 1987-05-27
ES8505137A1 (es) 1985-05-01
ES525367A0 (es) 1985-05-01

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