EP0106959A2 - 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
EP0106959A2
EP0106959A2 EP83107922A EP83107922A EP0106959A2 EP 0106959 A2 EP0106959 A2 EP 0106959A2 EP 83107922 A EP83107922 A EP 83107922A EP 83107922 A EP83107922 A EP 83107922A EP 0106959 A2 EP0106959 A2 EP 0106959A2
Authority
EP
European Patent Office
Prior art keywords
container
water
ultrasonic
line
filter
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
EP83107922A
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German (de)
English (en)
Other versions
EP0106959B1 (fr
EP0106959B2 (fr
EP0106959A3 (en
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
Original Assignee
Brown Boveri Reaktor GmbH
ABB Reaktor GmbH
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Publication date
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Application filed by Brown Boveri Reaktor GmbH, ABB Reaktor GmbH filed Critical Brown Boveri 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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Publication of EP0106959B2 publication Critical patent/EP0106959B2/fr
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Classifications

    • 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 method for removing deposits on the surfaces of the components of a water-cooled nuclear reactor plant, the components being subjected to ultrasonic vibrations using water as the coupling medium.
  • the bubbles collapse at high speed, whereby energy is released in the immediate vicinity of these very small bubbles, which manifests itself as an overpressure of the order of a thousand bar and as a microflow.
  • the interfaces between liquid and solid represent instability points and thus cavitation nuclei. This process is called micro-roughing, since even the smallest foreign particles are removed from the solid surface by purely mechanical forces.
  • This object is achieved according to the invention in that for cleaning a completely assembled fuel assembly, the same is simultaneously sonicated from opposite sides with ultrasonic transducers of the same power. The forces acting on the fuel element cancel each other out, so that damage is reliably avoided.
  • a device for carrying out the method is characterized in that the fuel assembly is arranged in a closed water-filled container, that ultrasonic transducers are attached to at least two opposite outer sides of the container, that the respective opposite ultrasonic transducers lie on a common central axis and that the container is in a shielding water basin.
  • a special design of the device provides that the container is provided with a bypass line for circulating the water located therein and that a circulating pump and a filter are connected in series in the bypass line.
  • the removed deposit particles are thus filtered out and impairment of the ultrasound intensity is avoided.
  • Another device for carrying out the process provides that the fuel assembly is arranged in a water-filled reef container which is open at the top, that ultrasonic transducers are attached to at least two opposite outer sides of the container and that the container is located in a water basin for shielding purposes.
  • This training is used for fuel elements that only have to be cleaned in their lower area for the purpose of checking the lower ends of the cladding tubes.
  • a line leads away from the open-topped tank, the free end of which opens into the water pool, this line connected in series having a filter and a circulating pump.
  • the ultrasonic vibrators are attached to the container with the interposition of a vibrating plate.
  • a device for checking the degree of purity of the water leaving the container is provided in the bypass line or line assigned to the container in the flow direction, in front of the filter.
  • a particularly advantageous embodiment of the device results from the fact that a sipping container present in water-cooled nuclear reactor plants is used to hold the fuel element.
  • a method for selectively using such a device for removing deposits and for carrying out a sipping test is characterized in that the deposits are removed first and then the sipping test is carried out.
  • Fig. 1 shows a portion of a water basin 1, which is used to store spent fuel 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 dogged together via not shown control pipe and form the skeleton 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 provided by the method with ultrasound transducers of the same power arranged opposite one another, the forces acting on the components of the fuel assembly are mutually canceled out or at least reduced.
  • each transducer plate carries nine ultrasonic transducers 14 with the same power and the same geometric arrangement.
  • 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 assembly 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 for loading or unloading the loading can be opened or eaten remotely with a fuel assembly.
  • the ultrasound reverberators are also operated by the control unit, as indicated by the connection 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 interfere with the cleaning process, the container has a bypass line provided with a filter and a circulating pump.
  • the bypass line 26 is connected at one end in the vicinity of the container base 27 and at the other end in the vicinity of the cover 20 to the container 3.
  • the circulation 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 must be replaced.
  • Such a sipping container would only have to be strengthened with ultrasonic vibrators 14 and the bypass line 26, in order to be used additionally for ultrasonic cleaning to be cash. 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 for performing the method according to the invention.
  • 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 container is chosen so large that there is a gap of approximately 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 vibrators 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 tank 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 container is provided in front of the filter 24 when viewed in the flow direction.
  • the ultrasonic vibrators 14 and the circulating pump 25 can be operated remotely via a control device (not shown) arranged outside the water basin.

Landscapes

  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Food Science & Technology (AREA)
  • Physics & Mathematics (AREA)
  • General Engineering & Computer Science (AREA)
  • High Energy & Nuclear Physics (AREA)
  • Cleaning By Liquid Or Steam (AREA)
  • Monitoring And Testing Of Nuclear Reactors (AREA)
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 true EP0106959A2 (fr) 1984-05-02
EP0106959A3 EP0106959A3 (en) 1984-06-13
EP0106959B1 EP0106959B1 (fr) 1987-04-22
EP0106959B2 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)

Country Link
EP (1) EP0106959B2 (fr)
DE (2) DE3238886A1 (fr)
ES (1) ES8505137A1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2586322A1 (fr) * 1985-08-14 1987-02-20 Framatome Sa Procede de nettoyage et de decontamination par ultrasons d'enceintes et dispositif correspondant
FR2590716A1 (fr) * 1985-11-26 1987-05-29 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
EP0373936A1 (fr) * 1988-12-15 1990-06-20 Westinghouse Electric Corporation Méthode et système pour enlever les débris d'assemblages de combustible nucléaire par variation pulsatoire de la pression
EP0418722A1 (fr) * 1989-09-21 1991-03-27 Ente Nazionale Per L'energia Elettrica - (Enel) Procédé de décontamination totale de matériau métallique radioactif
US5092355A (en) * 1988-12-15 1992-03-03 Westinghouse Electric Corp. Pressure pulse method for removing debris from nuclear fuel assemblies

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB839402A (en) * 1956-10-04 1960-06-29 Bendix Aviat Corp "method of cleaning radioactive articles"
US4071376A (en) * 1975-09-08 1978-01-31 Mcneer Larry M Ultrasonic cleaning with floating transducers

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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.
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

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB839402A (en) * 1956-10-04 1960-06-29 Bendix Aviat Corp "method of cleaning radioactive articles"
US4071376A (en) * 1975-09-08 1978-01-31 Mcneer Larry M Ultrasonic cleaning with floating transducers

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
CHEMICAL ENGINEERING PROGRESS, Band 58, Nr. 4, April 1962, Seiten 96-98, New York, USA *
NUCLEONICS, Band 7, Nr. 7, Juli 1958, Seiten 104-105, New York; USA *

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2586322A1 (fr) * 1985-08-14 1987-02-20 Framatome Sa Procede de nettoyage et de decontamination par ultrasons d'enceintes et dispositif correspondant
FR2590716A1 (fr) * 1985-11-26 1987-05-29 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
EP0373936A1 (fr) * 1988-12-15 1990-06-20 Westinghouse Electric Corporation Méthode et système pour enlever les débris d'assemblages de combustible nucléaire par variation pulsatoire de la pression
US5002079A (en) * 1988-12-15 1991-03-26 Westinghouse Electric Corp. Pressure pulse method and system for removing debris from nuclear fuel assemblies
US5092355A (en) * 1988-12-15 1992-03-03 Westinghouse Electric Corp. Pressure pulse method for removing debris from nuclear fuel assemblies
EP0418722A1 (fr) * 1989-09-21 1991-03-27 Ente Nazionale Per L'energia Elettrica - (Enel) Procédé de décontamination totale de matériau métallique radioactif

Also Published As

Publication number Publication date
ES525367A0 (es) 1985-05-01
DE3238886A1 (de) 1984-04-26
DE3371138D1 (en) 1987-05-27
ES8505137A1 (es) 1985-05-01
DE3238886C2 (fr) 1991-01-03
EP0106959B1 (fr) 1987-04-22
EP0106959B2 (fr) 1992-04-15
EP0106959A3 (en) 1984-06-13

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