EP0702838A1 - Vorrichtung zur dekontamination einer radioaktiv kontaminierten oberfläche - Google Patents
Vorrichtung zur dekontamination einer radioaktiv kontaminierten oberflächeInfo
- Publication number
- EP0702838A1 EP0702838A1 EP94916146A EP94916146A EP0702838A1 EP 0702838 A1 EP0702838 A1 EP 0702838A1 EP 94916146 A EP94916146 A EP 94916146A EP 94916146 A EP94916146 A EP 94916146A EP 0702838 A1 EP0702838 A1 EP 0702838A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- dust
- separator
- container
- suction
- 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
Links
- 239000000428 dust Substances 0.000 claims abstract description 29
- 239000000203 mixture Substances 0.000 claims abstract description 9
- 238000003860 storage Methods 0.000 claims abstract description 8
- 238000005422 blasting Methods 0.000 claims description 25
- 238000007664 blowing Methods 0.000 claims description 3
- 239000000463 material Substances 0.000 claims description 3
- 238000001914 filtration Methods 0.000 claims description 2
- 239000007789 gas Substances 0.000 claims 2
- 230000002285 radioactive effect Effects 0.000 abstract description 9
- 238000005202 decontamination Methods 0.000 abstract description 6
- 230000003588 decontaminative effect Effects 0.000 abstract description 6
- 239000002699 waste material Substances 0.000 abstract description 6
- 238000004140 cleaning Methods 0.000 abstract description 4
- 238000009434 installation Methods 0.000 abstract 3
- 238000000605 extraction Methods 0.000 abstract 2
- 239000000443 aerosol Substances 0.000 description 5
- 230000009467 reduction Effects 0.000 description 4
- 230000032258 transport Effects 0.000 description 4
- 230000008439 repair process Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000005488 sandblasting Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
- B24C9/00—Appurtenances of abrasive blasting machines or devices, e.g. working chambers, arrangements for handling used abrasive material
Definitions
- the invention relates to a device for decontamination of a radioactively contaminated surface, as is known, for example, from German Patent 40 17 998.
- German patent specification 40 17 998 discloses a mobile device for decontaminating the inner surface of a pipe open at one end, for example a stationary loop line of a pressurized water reactor after the steam generator has been disconnected, using a dry sandblasting process, in which a blasting system with a closed blasting medium circuit used.
- This blasting system contains devices for separating the dry blasting agent-dust mixture drawn in from a working volume into two fractions with different grain sizes, the fraction with the larger average grain size being fed to a pressure vessel for reuse.
- An injector operated with compressed gas is provided to generate a negative pressure required to extract the blasting agent-dust mixture and to separate the dust from the blasting agent.
- a filter container in the cyclone and the device for separating the dust from the blasting medium in which the compressed gas sucked in by the injector and, after leaving this separating device, for example a cyclone, still carrying radioactive dust, is cleaned by an aerosol filter before it is passed through the Injector emerges into the exterior.
- a dust container is arranged outside the flow path of the dust-transporting compressed gas, in which part of the dust settles due to the reduction in the flow speed and under the effect of gravity.
- a filter container with a large volume and an aerosol filter with a large surface area must be used.
- the dust accumulates in the dust container only in loose, less compressed form, so that the waste volume is relatively large. This loosely poured dust must be disposed of with the large aerosol filters in several dose-intensive individual transports.
- the invention is based on the object of specifying a device for the decontamination of radioactively contaminated surfaces, with which a further reduction in the dose burden on the personnel during operation of the blasting system and in the disposal of the radioactive dust and filters which occur and a reduction in the waste volume is made possible.
- a device for decontaminating a radioactively contaminated surface with a dry mechanical blasting medium contains according to the invention a suction device for suctioning the
- a separator for separating the suctioned off by the suction device Blasting agent-dust mixture in a dust fraction and in a reusable blasting material fraction as well as a collecting container connected between the suction device and the separator, which contains a filter device for filtering the suction gas flowing through the collecting container into the suction device, the filter device can be connected to a blow-off device for blowing off the filter.
- Radioactive dust with high activity collects in the collection container and in the filter device.
- the filters are arranged in the collecting container and can be disposed of together with the dust, the dose burden on the personnel associated with the disposal is significantly reduced. Since the dust on the filter and below the filter in the collecting container is obtained in a relatively compact form and no longer in small individual pots with a relatively large dead volume, the waste volume is significantly reduced compared to the known embodiment.
- the filter device in the collecting container can be connected to a blow-off line for blowing off the filters, the filters can be cleaned by applying counterpressure and the dust attached to the filter in a compact form falls to the bottom of the collecting container and lies there in a significantly higher density than in the known device.
- the collection container is additionally arranged in a lockable shielding container, which brings about a further reduction in the dose load during operation of the blasting system and during removal of the radioactive dust and the filters. Furthermore, as compared to the known embodiment, there is no filter housing cleaning after removal of the filter, which was necessary in the known embodiment, as a dose-intensive operation. to comply with the limits for contamination and dose rate during the transport of radioactive goods.
- the total time required is reduced by eliminating the need to change the known dust pots.
- the waste volume is reduced by a factor of 5, so that a single collecting container with a volume of 200 l is sufficient for the decontamination of a four-loop system with eight pipe ends.
- a device for decontaminating a radioactive contaminated surface contains a blasting system 1 with a closed blasting medium circuit.
- the blasting system 1 comprises a separator 2, preferably a cyclone, which is arranged with its outlet above a storage container 4.
- the recovered blasting material is collected in this storage container 4.
- the reservoir 4 is connected to a pressure vessel 6 via a drop valve (not shown in the figure). In its upper region, this pressure vessel 6 is connected to a pressure line 10, into which the recovered blasting medium is introduced via a feed valve arranged at the bottom of the pressure vessel 6.
- the blasting agent-dust mixture created during blasting is conveyed into the separator 2 via a suction line 12.
- the vacuum required to operate the cyclone used as separator 2 is generated by a suction device 14, for example a blower, or an injector operated with compressed gas, preferably compressed air, which supplies the cleaned suction gas sucked in from the cyclone via a gas outlet 16 blows into the environment.
- the separator 2, the storage container 4 and the pressure container 6 are arranged together on a mobile base and form a unit.
- a collecting container 20 for example made of steel, in the flow path of the suction gas.
- the collecting container 20 is arranged and separated from the mobile unit comprising the separator 2, storage container 4 and pressure container 6 is also located in a shielding container 22, preferably a shielding container 22 made of concrete, which can be closed with a lid, not shown in the figure, and is provided with transport eyelets 24 for easier transport.
- the connection of the collecting container 20 into the flow path of the suction gas is preferably carried out via flexible hose lines 18 and 19.
- the collecting container 20 there are several, for example three, parallel, hollow cylindrical aerosol filters 30 which are arranged between a holder 32 in section and one Lid 34 of the collecting container 20 are clamped. Sealing rings 33 are located on the end faces of the cylindrical aerosol filters 30, which prevent dust-permeated compressed gas from passing the filters 30 via the injector 14 into the outside space.
- the inner cavity opens on the flow side into a funnel-shaped outlet connection 36, which opens into an interior of a filter head 38 arranged above the cover 34.
- This filter head 38 is connected to the suction device 14 via the flexible hose line 18.
- blow lines 40 also open, which are connected to a compressed air reservoir via a valve, not shown, and with which can be carried out with a sudden blow off of the filter 30 when the injector 14 is switched off.
- the dust which arises during the blasting treatment settles on the filters 30 in compressed form and is also present in compressed form after being blown off in the collecting container 20 and can be disposed of together with the radioactive contaminated filters 30 without additional dismantling measures, with a low dose load on the personnel
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (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)
- Filtering Of Dispersed Particles In Gases (AREA)
- Cyclones (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE4319095 | 1993-06-08 | ||
| DE4319095A DE4319095C2 (de) | 1993-06-08 | 1993-06-08 | Vorrichtung zur Dekontamination einer radioaktiv kontaminierten Oberfläche |
| PCT/DE1994/000614 WO1994029879A1 (de) | 1993-06-08 | 1994-06-01 | Vorrichtung zur dekontamination einer radioaktiv kontaminierten oberfläche |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0702838A1 true EP0702838A1 (de) | 1996-03-27 |
| EP0702838B1 EP0702838B1 (de) | 1997-03-19 |
Family
ID=6489949
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP94916146A Expired - Lifetime EP0702838B1 (de) | 1993-06-08 | 1994-06-01 | Vorrichtung zur dekontamination einer radioaktiv kontaminierten oberfläche |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US5749470A (de) |
| EP (1) | EP0702838B1 (de) |
| JP (1) | JPH08506422A (de) |
| DE (2) | DE4319095C2 (de) |
| ES (1) | ES2100065T3 (de) |
| WO (1) | WO1994029879A1 (de) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6447366B1 (en) * | 2000-07-31 | 2002-09-10 | The Board Of Regents, Florida International University | Integrated decontamination and characterization system and method |
| EP2505520B1 (de) * | 2011-03-30 | 2015-01-07 | Bayer Intellectual Property GmbH | Fördervorrichtung für pulverförmiges und/oder granuliertes Gut |
| EP2505521B1 (de) * | 2011-03-30 | 2015-01-07 | Bayer Intellectual Property GmbH | Fördereinrichtung für pulverförmiges und/oder granuliertes Gut sowie Gemische dieses Gutes mit Flüssigkeiten |
| EP2505272B1 (de) * | 2011-03-30 | 2014-06-04 | Bayer Intellectual Property GmbH | Mobiler Sichter |
| JP5957650B2 (ja) * | 2012-02-29 | 2016-07-27 | 株式会社日本環境調査研究所 | 除染方法およびドライアイス打ち込みシステム並びに除染システム |
| US9302294B2 (en) | 2013-08-02 | 2016-04-05 | Babcock Noell Gmbh | Separating radioactive contaminated materials from cleared materials resulting from decommissioning a power plant |
| CN112025564A (zh) * | 2020-09-02 | 2020-12-04 | 东台耀强机械制造有限公司 | 一种型钢抛丸装置 |
| CN114155986B (zh) * | 2021-11-27 | 2024-02-06 | 南华大学 | 放射性核废金属的去污系统 |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3001289A1 (de) * | 1977-12-12 | 1981-07-16 | Delbag-Luftfilter Gmbh, 1000 Berlin | In abfallbehaelter angeordnete filterelemente zur abscheidung gesundheitschaedlicher stoffe aus stroemender luft im bereich kerntechnischer anlagen |
| DE3017590A1 (de) * | 1980-05-08 | 1981-11-12 | Kernforschungszentrum Karlsruhe Gmbh, 7500 Karlsruhe | Filtergehaeuse in verbindung mit einer heissen zelle |
| DE3230375C2 (de) * | 1982-08-14 | 1984-08-16 | Nukem Gmbh, 6450 Hanau | Vorrichtung zur Reinigung radioaktiver Abgase |
| JPS59174735A (ja) * | 1983-03-25 | 1984-10-03 | Toshiba Corp | 放射能で汚染された機器の除染方法およびその装置 |
| JPS59209765A (ja) * | 1983-05-10 | 1984-11-28 | Kiyoshi Kawasaki | ブラストシステム |
| US4993200A (en) * | 1986-03-11 | 1991-02-19 | Kawasaki Steel Techno-Research Corp | Pollution free blaster system and blaster head therefor |
| NL8902245A (nl) * | 1989-09-07 | 1991-04-02 | Algemene Bank Nederland N V | Straalinrichting. |
| DE4017998A1 (de) * | 1990-06-05 | 1992-01-09 | Siemens Ag | Verfahren und vorrichtung zur dekontamination radioaktiv kontaminierter oberflaechen |
| US5291697A (en) * | 1992-06-11 | 1994-03-08 | Nelco Acquisition Corporation | Surface abrading machine having transverse oscilliation |
| US5529530A (en) * | 1994-11-10 | 1996-06-25 | Ltc Americas Inc. | Sealed waste transfer system for vacuum blasting |
-
1993
- 1993-06-08 DE DE4319095A patent/DE4319095C2/de not_active Expired - Fee Related
-
1994
- 1994-06-01 EP EP94916146A patent/EP0702838B1/de not_active Expired - Lifetime
- 1994-06-01 ES ES94916146T patent/ES2100065T3/es not_active Expired - Lifetime
- 1994-06-01 WO PCT/DE1994/000614 patent/WO1994029879A1/de not_active Ceased
- 1994-06-01 DE DE59402162T patent/DE59402162D1/de not_active Expired - Fee Related
- 1994-06-01 JP JP7501176A patent/JPH08506422A/ja active Pending
-
1995
- 1995-12-08 US US08/569,717 patent/US5749470A/en not_active Expired - Fee Related
Non-Patent Citations (1)
| Title |
|---|
| See references of WO9429879A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| US5749470A (en) | 1998-05-12 |
| WO1994029879A1 (de) | 1994-12-22 |
| JPH08506422A (ja) | 1996-07-09 |
| DE59402162D1 (de) | 1997-04-24 |
| DE4319095A1 (de) | 1994-12-15 |
| ES2100065T3 (es) | 1997-06-01 |
| DE4319095C2 (de) | 1995-04-20 |
| EP0702838B1 (de) | 1997-03-19 |
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