EP0018152B1 - Decontamination method - Google Patents

Decontamination method Download PDF

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Publication number
EP0018152B1
EP0018152B1 EP80301113A EP80301113A EP0018152B1 EP 0018152 B1 EP0018152 B1 EP 0018152B1 EP 80301113 A EP80301113 A EP 80301113A EP 80301113 A EP80301113 A EP 80301113A EP 0018152 B1 EP0018152 B1 EP 0018152B1
Authority
EP
European Patent Office
Prior art keywords
components
grit
nozzle
water
mixture
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
Application number
EP80301113A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0018152A1 (en
Inventor
Robert Thomas Marchese
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.)
CBS Corp
Original Assignee
Westinghouse Electric Corp
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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=21849874&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0018152(B1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Westinghouse Electric Corp filed Critical Westinghouse Electric Corp
Publication of EP0018152A1 publication Critical patent/EP0018152A1/en
Application granted granted Critical
Publication of EP0018152B1 publication Critical patent/EP0018152B1/en
Expired 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
    • B24C11/00—Selection of abrasive materials or additives for abrasive blasts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
    • B24C1/00—Methods for use of abrasive blasting for producing particular effects; Use of auxiliary equipment in connection with such methods
    • 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
    • G21F9/28—Treating solids

Definitions

  • This invention relates to decontamination methods and more particularly to methods for decontaminating components of nuclear power plants.
  • the present invention resides in a method of decontaminating metal components, especially components of nuclear power plants, wherein the components are exposed to a jet of a water-grit mixture to remove radioactive particles therefrom and, at the same time, to wash the radioactive particles away from said components without damaging the metal surface of the component, characterized in that said jet of water-grit mixture has a grit concentration of from 3% to 7% by weight and is emitted from a nozzle which is moved along said components at a distance of 15 cm to 25 cm from the surface of said component with an angle of impingement of between 30° to 70° and at a speed of 30 cm/min to 90 cm/min for intense particle removing action.
  • a 2.3 cm diameter tube 30 extends through universal joint 32 and closure plate 14 so that the front end of tube 30 is disposed within container 12.
  • a nozzle 34 is mounted on the front end of tube 30 and is also connected to flexible hose 36.
  • Nozzle 34 may be chosen from those well known in the art such as a "Dynajector" manufactured by the Aqua-Dyne Engineering, Inc. of Houston, Texas.
  • Flexible hose 36 extends through closure plate 14 and is connected to grit supply 38 for supplying grit to nozzle 34.
  • Tube 30 is connected to pump 40 which may be a 40 horsepower pump which is also connected to water supply 42 for supplying water to nozzle 34.
  • Nozzle 34 provides a mechanism for mixing the grit and water and for emitting the water-grit mixture from nozzle 34 toward specimen 18.
  • Tube 30 is also attached to drive mechanism 44 which may be a mechanism for controlling the horizontal movement of tube 30 and nozzle 34.
  • Drive mechanism 44 may be chosen from those well known in the art.
  • the decontamination method comprises introducing water through tube 30 at a pressure between 140 x 10 5 Pa (140 kg/cm 2 ) and 190 x 10 5 Pa (190 kg-cm2).
  • the water flow rate at this pressure should be approximately 30 to 34 litres per minute through nozzle 34.
  • grit may be used for mixing with the water such as alumina or magnetite.
  • the grit size should be approximately 120 (about 125,um sieve opening) to 325 (44,urn sieve opening) mesh size in accordance with United States Sieve Series Mesh Sizes. It is important to note that the grit concentration in the water spray should be approximately 3% to approximately 7% by weight.
  • nozzle 34 In order to provide effective decontamination without excessive metal deterioration, it is important that the nozzle be placed approximately 15 cm to 25 cm from the surface of specimen 18. It has also been found that nozzle 34 should be arranged so that the water-grit mixture impinges the surface of specimen 18 at approximately between a 30°-70° angle and preferably at about 45°.
  • the decontamination method may be used on nuclear reactor components such as nuclear steam generators with the equipment adapted to be placed within the nuclear component. Therefore, the invention provides a decontamination method for lowering the radiation field of nuclear reactor power components so that working personnel may enter the component and perform operations thereon.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Engineering & Computer Science (AREA)
  • High Energy & Nuclear Physics (AREA)
  • Cleaning In General (AREA)
  • Cleaning By Liquid Or Steam (AREA)
  • Detergent Compositions (AREA)
  • Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)
  • Working Measures On Existing Buildindgs (AREA)
EP80301113A 1979-04-12 1980-04-08 Decontamination method Expired EP0018152B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US2959879A 1979-04-12 1979-04-12
US29598 1979-04-12

Publications (2)

Publication Number Publication Date
EP0018152A1 EP0018152A1 (en) 1980-10-29
EP0018152B1 true EP0018152B1 (en) 1983-09-14

Family

ID=21849874

Family Applications (1)

Application Number Title Priority Date Filing Date
EP80301113A Expired EP0018152B1 (en) 1979-04-12 1980-04-08 Decontamination method

Country Status (9)

Country Link
EP (1) EP0018152B1 (ja)
JP (1) JPS55141700A (ja)
KR (1) KR830002114B1 (ja)
CA (1) CA1130565A (ja)
DE (1) DE3064799D1 (ja)
ES (1) ES490511A0 (ja)
FR (1) FR2454160A1 (ja)
YU (1) YU42329B (ja)
ZA (1) ZA802191B (ja)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2023278430A1 (en) * 2021-06-29 2023-01-05 Shape Technologies Group, Inc. Fluid jet systems and methods of use to access and disassemble components hazardous articles

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4374462A (en) * 1979-08-02 1983-02-22 Westinghouse Electric Corp. Decontamination apparatus
JPS6042440B2 (ja) * 1980-07-29 1985-09-21 アブレイシブ・デベロツプメンツ・リミテツド 汚染除去装置
EP0116663A1 (de) * 1983-02-19 1984-08-29 NTG Neue Technologien GmbH & Co. KG Verfahren zur Dekontamination der inneren Oberfläche eines Reaktorbehälters
US4494607A (en) * 1983-05-09 1985-01-22 Ford Michael B Method of cleaning and inhibiting sucker rod corrosion
EP0158743B1 (de) * 1984-01-26 1988-07-27 Ernst Schmutz GmbH Verfahren und Vorrichtung zum Reinigen radioaktiv verseuchter Anlagenteile
DE4306631A1 (de) * 1993-03-03 1994-09-08 Siemens Ag Vorrichtung zur Dekontamination radioaktiv kontaminierter Oberflächen
US5637030A (en) * 1994-02-17 1997-06-10 Minerals Research & Recovery, Inc. Abrasive formulation for waterjet cutting and method employing same
KR101406938B1 (ko) * 2012-04-15 2014-06-12 원대연 복부재가 다양한 형태의 문양을 갖는 복합거더

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3130083A (en) * 1960-01-27 1964-04-21 Henry C Turner Treatment of articles made of leatherlike material
DE2107479C3 (de) * 1971-02-17 1974-01-03 Siemens Ag, 1000 Berlin U. 8000 Muenchen Verfahren zur Dekontaminierung der Oberflächen von Kernreaktorbauteilen
JPS51121698A (en) * 1975-04-18 1976-10-25 Toshiba Corp Method and its device for removing pollution from an instrument pollut ed by radioactivity
JPS5252473A (en) * 1975-10-24 1977-04-27 Toshiba Corp Fur removing system

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
EUR 4186 d; Europäische Atomgemeinschaft-EURATOM. 1968 MOSSELMANS G. and NIENHAUS J.: "Auswahl von Abrasiven und Badzusätzen für die Dekontaminierung mittels Schlammstrahlen" *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2023278430A1 (en) * 2021-06-29 2023-01-05 Shape Technologies Group, Inc. Fluid jet systems and methods of use to access and disassemble components hazardous articles

Also Published As

Publication number Publication date
YU42329B (en) 1988-08-31
ZA802191B (en) 1981-04-29
FR2454160A1 (fr) 1980-11-07
EP0018152A1 (en) 1980-10-29
KR830002114B1 (ko) 1983-10-12
ES8301386A1 (es) 1982-12-01
YU63680A (en) 1984-04-30
JPS6333117B2 (ja) 1988-07-04
JPS55141700A (en) 1980-11-05
KR830003115A (ko) 1983-05-31
CA1130565A (en) 1982-08-31
ES490511A0 (es) 1982-12-01
DE3064799D1 (en) 1983-10-20

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