EP0116663A1 - Procédé de décontamination des surfaces internes d'une cuve de réacteur - Google Patents

Procédé de décontamination des surfaces internes d'une cuve de réacteur Download PDF

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Publication number
EP0116663A1
EP0116663A1 EP83101599A EP83101599A EP0116663A1 EP 0116663 A1 EP0116663 A1 EP 0116663A1 EP 83101599 A EP83101599 A EP 83101599A EP 83101599 A EP83101599 A EP 83101599A EP 0116663 A1 EP0116663 A1 EP 0116663A1
Authority
EP
European Patent Office
Prior art keywords
nozzle
wall
suction
guide column
jet
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.)
Withdrawn
Application number
EP83101599A
Other languages
German (de)
English (en)
Inventor
Rudolf M. Ortmayer
Peter Dipl.-Phys. Finke
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.)
Ntg Neue Technologien & Co KG GmbH
Original Assignee
Ntg Neue Technologien & Co KG GmbH
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 Ntg Neue Technologien & Co KG GmbH filed Critical Ntg Neue Technologien & Co KG GmbH
Priority to EP83101599A priority Critical patent/EP0116663A1/fr
Priority to JP4328283A priority patent/JPS59154399A/ja
Publication of EP0116663A1 publication Critical patent/EP0116663A1/fr
Withdrawn legal-status Critical Current

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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
    • G21F9/005—Decontamination of the surface of objects by ablation

Definitions

  • the invention relates to a method of decontaminating the inner surface of a reactor vessel by cleaning of the substantially double-layer structure Oxidbelages of which strigagese from the wall quasi heterogeneous amorphous film is easily ablatable, while directed to austenitic usually steel wall surface H art harshness (0, 9 to a maximum of 9.5 MOHS hardness) with which a firm connection is established and essentially consists of the basic elements Fe, Cr, Ni, the radiochemical structure of which contains the decomposition products Co60, Zr, 144 Ce and others , developed an average dose rate of approx. 240 R / h ..
  • the term contamination is to be understood exclusively as the radioactive contamination of the surfaces of the reactor pressure vessel affected by the reactor water - which will be referred to as reactor vessel in the following - and the layer formation on the carrier caused by this contamination, whereby, however, that on the carrier material by chemical and physical processes often occurring diffusion of this oxide layer in the carrier material should also be addressed.
  • the decontamination work to be performed can therefore not only be limited to removing the more or less accumulating or grown layer, it must also include the removal of a surface layer of the carrier material which has been damaged by penetrated oxidation particles.
  • the theoretical lifespan of a reactor vessel is generally designed for 30 years of operation.
  • the decontamination factor i.e. the ratio of activity concentrations or activity area densities of a contaminating radioactive material before and after decontamination is at least 100.
  • the two-layer oxide coating which is not precisely delimited in terms of diffusion contamination, can grow in the course of 10 to 15 years of operation - assuming an average burn-up of 15,000 MWd / Te - up to 2 mm and locally up to 3 mm.
  • DE-OS 31 35 882.9 are provided, provides only a decontamination factor of about 2 for the essentially flat cleaning here.
  • Such a procedure does not allow repair work to be carried out for a limited period of time or, in the case of alternating shift operation, in a semi-continuous manner within the reactor vessel.
  • the effect of the liquid jet directed at the wall is not only derived from the set of impulses, but also the forces resulting from the jet - which in this case is to be addressed as a sound source - also become effective.
  • the spherical waves generated are pushed together in the direction of movement and move away from each other in the opposite direction.
  • the maxima of the spherical waves follow each other more and more closely in the direction of movement and accumulate in a tangent spherical area when the speed of sound is reached, i.e. in the so-called sound barrier, so that there is practically only an extremely strong pressure wave directed against the wall, the effect of which is at least partially added to the forces directly developed by the jet.
  • the resulting sound energy is the sound intensity, which is due to a surface perpendicular to the direction of propagation of the sound defined size and time.
  • the sound source moves even faster, it breaks through the sound barrier, the individual spherical pressure waves then being enveloped by the so-called MACH cone, at the top of which the sound source, i.e. in this case the incident beam.
  • the MACH cone is more or less a truncated cone, but in connection with the angle the jet direction and high static pressure when exiting the nozzle has a peeling effect in the superimposed, soft oxide layer and in the hard oxide layer bound to the wall.
  • the spiral-shaped guidance of the beam along the wall can be carried out at a preset speed by known means, for example by connecting the rotary drive to the drive which enables the axial adjustment via an adjustable intermediate member.
  • the speed is set so that a cleaning performance of about 1 cm 2 is achieved per minute.
  • the cleaning can take place in gaseous or aqueous liquid media.
  • This calculation process can be expanded to the extent that the required feed rate of the nozzle along the wall is entered as an additional value, which can be used as a control variable for control means for setting the feed rate.
  • a is assigned to the nozzle area TV camera work results in controlled and not satisfactory adjustment signal or control pulse for the corrective adjustment for the A bFlvorgang are determining factors.
  • An important factor in assessing the suitability of the process for quality is not only the efficiency of the blasting device but also the separation and removal of the peeling products from the blasting liquid or from the water filling of the reactor vessel, as well as the possibility of reusing the blasting liquid.
  • a device suitable for carrying out the method provides that a centrally aligned, rotatably drivable guide column is mounted in its upper exit section from this in a cover centered by the edge of the reactor container and connected to it, while the lower end of the guide column is centrally fixed by support struts which can be actuated from above, so that the cleaning device is carried by a lifting carriage equipped with a nozzle drive, arranged on the guide column and equipped with a lifting drive, and this nozzle arm has in its end region a pivotable member provided with a suction bell for adjusting the nozzle distance and the nozzle angle to the wall, and with a connection for the nozzle leading supply line and a suction line leading away from the suction bell is provided, the supply line having a high-pressure compressor attached to this in the outlet section of the guide column from the cover plate arranged on this d the suction line is connected to the floor suction line leading through the guide column, after its exit from the guide column, by a branch piece, and that the central floor suction line is
  • Such a device permits the correct setting of the peeling-off parameters and ensures safe guidance of the cleaning apparatus in the container.
  • the high pressure compressor used is a known design according to the prior art 'and requires no additional explanation.
  • the exit bearing of the guide column from the cover also receives the drive gear for the guide column, among other things. offers a worm gear as a suitable drive gear.
  • the lifting drive of the lifting truck is a rack and pinion gear, the rack, which is also encompassed by the lifting truck, being arranged axially parallel to the guide column.
  • the lower limit of the floor suction line is a telescopically resilient end piece that is designed as a central suction nozzle.
  • the nozzle it is proposed that it be hard-coated, e.g. has a diamond coating.
  • the R eaktor constitutioner 1 is closed by a cover 3 when carrying out the decontamination process, wherein this puts on the container 1 on the amplified outwardly projecting rim 2 and is connected thereto.
  • the A ufsatzebene the cover 3 is formed by an overlapping collar flange 3.1.
  • a cover 3.4 is closed at the top by a cover 3.4 forming a formation.
  • the cover 3 is reinforced by stiffening ribs 3.5.
  • the cover 3.4 has a central through opening for the passage of the outlet section 4.1 of the guide column 4.
  • the guide column 4 is guided through a housing 5 placed on the cover, this housing accommodating the outlet bearing 5.1 and likewise the screw drive 5.2 for driving the guide column 4.
  • the support struts 6, which are arranged at the lower end 4.2 of the guide column 4 and can be actuated in a spreadable manner, are spread by lifting the central suction line 8.9 guided centrally in the guide column 4 and the stop flange 6.1 fixed to it by the toggle lever system 6.2 and guided evenly against the wall of the container 1, so that there is a central fixation of the guide column 4 in the lower B e region of the reactor vessel 1.
  • the lifting of the floor suction line 8.9 is brought about by a lifting member 6.3, which acts on it in its upper outlet area from the cover 3 and is not shown in detail in the drawing.
  • the actual cleaning device 7 is carried by a lifting carriage 8 which can be moved axially on the guide column 4, said lifting carriage being equipped with a lifting drive 8.1 and with a nozzle arm 8.2.
  • the lifting drive 8.1 is a rack and pinion drive, the rack 8.11 being arranged axially parallel to the guide column 4, leading through the lifting carriage 8.
  • a pivotable member 8.3 equipped with a suction bell 8.4 is provided for setting the nozzle spacing and the angle to the container wall, and is the carrier of the connection 8.5 receiving the nozzle 8.6, in which connection 8.5 the supply line 8.7 flows into.
  • the supply line 8.7 leads to a high-pressure condenser 10 for the jet liquid arranged on a support plate 9 in the exit area 4.1 of the guide column 4 from the cover 3.
  • the suction bell 8.4 is connected to the suction line 8.8.
  • the two wastewater streams are further fed back to the high-pressure compressor 10 in the bypass via a wastewater suction device 11.1 with filter 11.2 in the cleaned state.
  • the bottom suction line 8.9 opens at its lower end into a resilient central suction nozzle 8.12 that spans the bottom of the container.
  • the reactor vessel 1 is also provided with an air suction device 12.1 equipped with a filter 12.2.
  • a TV camera 13 is provided in the end region of the nozzle arm 8.2 for checking the peeling process and for possibly giving a signal or control pulse.
  • FIG. 3 schematically shows the process of peeling at approximately 1.1 times the speed of sound of the liquid jet 8.14 in the outlet area of the nozzle 8.6 in aqueous solution.
  • the angle of the nozzle 8.6 is directed against the wall in such a way that the MACH cone 8.13 which develops around the jet 8.14 and surrounds it, as soon as the jet 8.14 hits the softer region of the oxide layer, i. to layer 1.2, which is to be addressed as a heterogeneous-amorphous layer, at least loosens it and partially also the subsequent hard layer 1.1, while the actual peeling work is essentially carried out by the progressively moving beam 8.14.

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 In General (AREA)
  • Devices And Processes Conducted In The Presence Of Fluids And Solid Particles (AREA)
  • Physical Or Chemical Processes And Apparatus (AREA)
EP83101599A 1983-02-19 1983-02-19 Procédé de décontamination des surfaces internes d'une cuve de réacteur Withdrawn EP0116663A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP83101599A EP0116663A1 (fr) 1983-02-19 1983-02-19 Procédé de décontamination des surfaces internes d'une cuve de réacteur
JP4328283A JPS59154399A (ja) 1983-02-19 1983-03-17 原子炉容器の内側表面を除染するための方法および装置

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP83101599A EP0116663A1 (fr) 1983-02-19 1983-02-19 Procédé de décontamination des surfaces internes d'une cuve de réacteur

Publications (1)

Publication Number Publication Date
EP0116663A1 true EP0116663A1 (fr) 1984-08-29

Family

ID=8190301

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83101599A Withdrawn EP0116663A1 (fr) 1983-02-19 1983-02-19 Procédé de décontamination des surfaces internes d'une cuve de réacteur

Country Status (2)

Country Link
EP (1) EP0116663A1 (fr)
JP (1) JPS59154399A (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2156573A (en) * 1984-03-16 1985-10-09 Kernforschungsanlage Juelich Process and apparatus for separating ceramic nuclear fuels from metallic carriers
DE4437276A1 (de) * 1994-10-18 1996-04-25 Voest Alpine Mach Const Verfahren und Vorrichtung zur Entsorgung einer aktivierten und/oder radioaktiv kontaminierten metallischen Komponente eines Kernkraftwerkes
RU2146841C1 (ru) * 1998-02-19 2000-03-20 Российский федеральный ядерный центр - Всероссийский научно-исследовательский институт технической физики Способ дезактивации твердых поверхностей
EP1798735A1 (fr) * 2005-12-19 2007-06-20 Westinghouse Electric Germany GmbH Procédé et système permettant de prévoir un maniement et/ou une utilisation de matériau irradié conforme aux besoins
RU2520446C2 (ru) * 2012-10-15 2014-06-27 Открытое акционерное общество "Научно-производственное объединение по исследованию и проектированию энергетического оборудования им. И.И. Ползунова" (ОАО "НПО ЦКТИ") Способ очистки поверхностей энерготехнологического оборудования

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006289275A (ja) * 2005-04-12 2006-10-26 Matsumura Sangyo Kk 水質浄化装置及びそれを利用した水耕栽培装置

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2756145A1 (de) * 1977-12-16 1979-06-21 Bbc Brown Boveri & Cie Dekontaminations-verfahren und -einrichtung
FR2454160A1 (fr) * 1979-04-12 1980-11-07 Commissariat Energie Atomique Procede de decontamination de pieces radioactives
EP0027388A1 (fr) * 1979-10-16 1981-04-22 Westinghouse Electric Corporation Procédé et appareil de décontamination
EP0047047A2 (fr) * 1980-05-30 1982-03-10 Westinghouse Electric Corporation Appareil pour décontaminer les générateurs de vapeur nucléaires

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2756145A1 (de) * 1977-12-16 1979-06-21 Bbc Brown Boveri & Cie Dekontaminations-verfahren und -einrichtung
FR2454160A1 (fr) * 1979-04-12 1980-11-07 Commissariat Energie Atomique Procede de decontamination de pieces radioactives
EP0027388A1 (fr) * 1979-10-16 1981-04-22 Westinghouse Electric Corporation Procédé et appareil de décontamination
EP0047047A2 (fr) * 1980-05-30 1982-03-10 Westinghouse Electric Corporation Appareil pour décontaminer les générateurs de vapeur nucléaires

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2156573A (en) * 1984-03-16 1985-10-09 Kernforschungsanlage Juelich Process and apparatus for separating ceramic nuclear fuels from metallic carriers
DE4437276A1 (de) * 1994-10-18 1996-04-25 Voest Alpine Mach Const Verfahren und Vorrichtung zur Entsorgung einer aktivierten und/oder radioaktiv kontaminierten metallischen Komponente eines Kernkraftwerkes
DE4437276C2 (de) * 1994-10-18 2000-05-04 S Anlagen Und Stillegungstechn Verfahren und Vorrichtung zur Entsorgung einer aktivierten metallischen Komponente eines Kernkraftwerkes
RU2146841C1 (ru) * 1998-02-19 2000-03-20 Российский федеральный ядерный центр - Всероссийский научно-исследовательский институт технической физики Способ дезактивации твердых поверхностей
EP1798735A1 (fr) * 2005-12-19 2007-06-20 Westinghouse Electric Germany GmbH Procédé et système permettant de prévoir un maniement et/ou une utilisation de matériau irradié conforme aux besoins
RU2520446C2 (ru) * 2012-10-15 2014-06-27 Открытое акционерное общество "Научно-производственное объединение по исследованию и проектированию энергетического оборудования им. И.И. Ползунова" (ОАО "НПО ЦКТИ") Способ очистки поверхностей энерготехнологического оборудования

Also Published As

Publication number Publication date
JPS59154399A (ja) 1984-09-03

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PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

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Effective date: 19850502

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Inventor name: FINKE, PETER, DIPL.-PHYS.

Inventor name: ORTMAYER, RUDOLF M.