EP0018152B1 - Decontamination method - Google Patents
Decontamination method Download PDFInfo
- 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
Links
Images
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)
- Physics & Mathematics (AREA)
- General Engineering & Computer Science (AREA)
- High Energy & Nuclear Physics (AREA)
- Mechanical Engineering (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)
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 (zh) |
JP (1) | JPS55141700A (zh) |
KR (1) | KR830002114B1 (zh) |
CA (1) | CA1130565A (zh) |
DE (1) | DE3064799D1 (zh) |
ES (1) | ES8301386A1 (zh) |
FR (1) | FR2454160A1 (zh) |
YU (1) | YU42329B (zh) |
ZA (1) | ZA802191B (zh) |
Cited By (1)
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)
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 |
ATE36089T1 (de) * | 1984-01-26 | 1988-08-15 | Schmutz Gmbh Ernst | 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)
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 |
-
1980
- 1980-03-07 YU YU636/80A patent/YU42329B/xx unknown
- 1980-03-14 CA CA347,699A patent/CA1130565A/en not_active Expired
- 1980-04-08 EP EP80301113A patent/EP0018152B1/en not_active Expired
- 1980-04-08 DE DE8080301113T patent/DE3064799D1/de not_active Expired
- 1980-04-10 KR KR1019800001487A patent/KR830002114B1/ko active
- 1980-04-11 ES ES490511A patent/ES8301386A1/es not_active Expired
- 1980-04-11 FR FR8008179A patent/FR2454160A1/fr not_active Withdrawn
- 1980-04-11 ZA ZA00802191A patent/ZA802191B/xx unknown
- 1980-04-11 JP JP4700280A patent/JPS55141700A/ja active Granted
Non-Patent Citations (1)
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)
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 |
---|---|
YU63680A (en) | 1984-04-30 |
ZA802191B (en) | 1981-04-29 |
JPS55141700A (en) | 1980-11-05 |
ES490511A0 (es) | 1982-12-01 |
ES8301386A1 (es) | 1982-12-01 |
JPS6333117B2 (zh) | 1988-07-04 |
KR830003115A (ko) | 1983-05-31 |
FR2454160A1 (fr) | 1980-11-07 |
DE3064799D1 (en) | 1983-10-20 |
EP0018152A1 (en) | 1980-10-29 |
KR830002114B1 (ko) | 1983-10-12 |
YU42329B (en) | 1988-08-31 |
CA1130565A (en) | 1982-08-31 |
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Legal Events
Date | Code | Title | Description |
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PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
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AK | Designated contracting states |
Designated state(s): BE CH DE GB IT SE |
|
17P | Request for examination filed |
Effective date: 19810422 |
|
ITF | It: translation for a ep patent filed |
Owner name: ING. ZINI MARANESI & C. S.R.L. |
|
GRAA | (expected) grant |
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AK | Designated contracting states |
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REF | Corresponds to: |
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