EP1568888A1 - Apparat und Verfahren zum Entfernen von radioaktivem Material aus einem unschlossenem Raum - Google Patents

Apparat und Verfahren zum Entfernen von radioaktivem Material aus einem unschlossenem Raum Download PDF

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Publication number
EP1568888A1
EP1568888A1 EP05270003A EP05270003A EP1568888A1 EP 1568888 A1 EP1568888 A1 EP 1568888A1 EP 05270003 A EP05270003 A EP 05270003A EP 05270003 A EP05270003 A EP 05270003A EP 1568888 A1 EP1568888 A1 EP 1568888A1
Authority
EP
European Patent Office
Prior art keywords
tube
nozzle
accordance
storage vault
radioactive material
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
EP05270003A
Other languages
English (en)
French (fr)
Other versions
EP1568888B1 (de
Inventor
Phil Teague
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.)
Visuray AS
Original Assignee
Offshore Resource Group AS
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
Priority claimed from NO20040882A external-priority patent/NO20040882D0/no
Application filed by Offshore Resource Group AS filed Critical Offshore Resource Group AS
Publication of EP1568888A1 publication Critical patent/EP1568888A1/de
Application granted granted Critical
Publication of EP1568888B1 publication Critical patent/EP1568888B1/de
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • G21F7/00—Shielded cells or rooms
    • G21F7/005—Shielded passages through walls; Locks; Transferring devices between rooms
    • G21F7/01—Transferring by fluidic means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/60—Mounting; Assembling; Disassembling
    • F04D29/605—Mounting; Assembling; Disassembling specially adapted for liquid pumps
    • F04D29/606—Mounting in cavities
    • F04D29/607—Mounting in cavities means for positioning from outside
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/70—Suction grids; Strainers; Dust separation; Cleaning
    • F04D29/708—Suction grids; Strainers; Dust separation; Cleaning specially for liquid pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D7/00—Pumps adapted for handling specific fluids, e.g. by selection of specific materials for pumps or pump parts
    • F04D7/02—Pumps adapted for handling specific fluids, e.g. by selection of specific materials for pumps or pump parts of centrifugal type
    • F04D7/08—Pumps adapted for handling specific fluids, e.g. by selection of specific materials for pumps or pump parts of centrifugal type the fluids being radioactive

Definitions

  • This invention regards an apparatus and a method for the retrieval of fragments of radioactive waste from an enclosed vault, more exactly by a remote controlled vacuum nozzle, which is remotely steered into the enclosed vault through an access hole, which then retrieves the radioactive waste by means of vacuum and subsequently transfers the waste to a collection hopper.
  • Radioactive material All storage and handling of radioactive material are governed by astringent health and safety requirements. Storage on an installation, for example a nuclear power plant or a drilling rig for exploration drilling, takes place in a shielded environment. Upon requirement the material will either be processed or transferred to a permanent storage location.
  • the nature of the material does not permit direct human access to the container or location where the radioactive material has been stored for the purpose of manual retrieval of the radioactive material.
  • the radioactive material must be removed without any direct human contact, and therefore necessitates remote operation by mechanical manipulators with gripping apparatuses to retrieve the material from the closure it has been placed in. The manipulator must then move the material to another location where is can be exposed for further handling.
  • EP 0 730 094 A1 which illustrates a variable suction device, the vertical level of the pump being remote controlled by raising and lowering the pump along a framework.
  • the driving means (motor, pump) are submerged in the radioactive waste.
  • JP 7 214 096 discloses a device for the suction of sludge from the bottom of an open water reservoir, the suction nozzle being positioned on the bottom surface of the reservoir by the remote control of a telescopic boom and by winding the hose onto or off a reel on the telescopic boom.
  • the suction nozzle includes remote controlled driving means for the travelling of the suction nozzle horizontally on the bed and remote controlled devices for assisting the moving of the sludge towards the suction nozzle.
  • JP 10 020 089 discloses a device for the recovery of bottom sediment inside radioactive waste liquid tank.
  • a suction pump is arranged above the fluid level inside the tank.
  • the suction pump is allocated a suction hose, the free end of which is connected to a carriage being arranged to remotely travel horizontally along the bottom surface of the tank for the purpose of sucking in the clad.
  • the clad is recovered by means of a filter and the fluid is returned to the tank through a discharge hose.
  • the device is operated from inside the tank.
  • a remotely operated serpentine hose system is disclosed, which is manipulated by several sets of cooperating cylinders, every set being interconnected at the circumference of rings, the cylinders being located substantially parallel and in the direction of the centre axis of the hose system.
  • a suction nozzle being connected to an air-conveyance hose is attached to the free end of the manipulation system. By retraction and extension of the cylinders the suction nozzle can be moved in a three-axis system.
  • a water-jet system is used to tear up affixed materials.
  • Robot-crane is known a large gantry type crane, which can place its load within an unobstructed space by use of multiple lift cables.
  • the object of the invention is to remedy at least one of the disadvantages of prior art.
  • This invention regards an apparatus and a method for the retrieval of fragments of radioactive waste from a storage vault with limited access, a remote controlled nozzle being arranged at the free end of a flexible tube suitable to be remotely steered into the enclosed storage vault through an access hole, preferably located in the ceiling of the vault, with the purpose of retrieving the radioactive waste by means of negative pressure, i.e. suction, and deposit the waste in a suitable storage location for further handling.
  • negative pressure i.e. suction
  • the principle of the apparatus and method is to use a flexible air-conveyance conduit as the backbone of a system of control cables, which can be used to create controlled curvature with the conduit, thus allowing the operator to place the nozzle anywhere in the horizontal plane within the reach of the conduit.
  • the conduit assembly is flexible enough to be extended and retracted by use of a hose-reel upon which the non-deployed conduit is spooled. Upon remotely operated rotation of the hose-reel, the length of the conduit portion projecting into the storage vault is adjusted, thereby controlling the position of the nozzle in the vertical plane.
  • the air-conveyance conduit is used to transport rapidly moving air from within the storage vault towards a vacuum system, which is connected to the apparatus.
  • the airflow is used to transport radioactive material, which falls within fraction size range of which the nozzle is dimensioned, to a transport container, which is connected to the apparatus and the vacuum system, and located outside the storage vault. In this way the radioactive waste remains in a closed system even during the transfer from the storage vault to the transport container.
  • the apparatus comprises the following main components:
  • the conduit which under suitable remote control is to be guided into the radioactive material storage vault, comprises at a lower portion of the conduit a nozzle and an agitator.
  • the nozzle is preferably rotatable about an axis, which substantially coincides with or is parallel to the centre axis of the tube.
  • the agitator is in its operative position arranged immediately in front of the nozzle and is by a suitable motion capable of fragmenting the waste adjacent the nozzle and possibly moving the fragments into the airstream towards the nozzle.
  • the agitator may preferably be moved by one or more rotating, flexible shafts or by means of one or more hydraulic actuators.
  • the agitator driving means in the form of one or more motors, possibly a hydraulic pump, are preferably located outside the storage vault, thereby allowing simplified access in the event of maintenance.
  • the agitator substantially follows the movement of the nozzle.
  • the nozzle's interior geometry exhibits less passage cross section and less curvature radii than that of any other location in the consecutive flow path of the waste, including for example the curvature of the conduit spooled onto the hose-reel.
  • the purpose of the nozzle geometry is to cause possible blockage of the material flow to occur before the materials leaves the nozzle.
  • the nozzle is preferably made of a plurality of sections by an axial split, the upper portion of two or more nozzle sections in a hinged way are connected to a nozzle basement.
  • the nozzle can be opened using remote control, causing the interior cross section of the nozzle to extend and the stuck fragments to be liberated, thus falling out of the nozzle.
  • the lower portion of the tube may preferably also be provided with devices for cutting large fractions of the material to be sucked.
  • the lower portion of the tube may preferably be provided with a monitoring camera being interconnected with a monitoring system located together with the other control devices, thereby offering visual monitoring of nozzle, agitator etc.
  • the tube is deposited on a motorized reel in a spoolable manner, causing the lower tube portion to be locatable at any vertical level when the tube is lowered into a vault containing the radioactive material.
  • the conduit is provided with one or more tube actuation sets in the form of control cable sets, which are integrated onto the outer surface of the tube.
  • Each control cable set comprises three or more tensionable cables, which are located at equal intervals around the circumference of the tube.
  • the cables are sheathed between the upper end portion of the tube, at the connection to the hose-reel, and the portion of the tube at which a curvature of the tube is required to start.
  • the cables continue unsheathed between the lower end of the sheathing and the lower cable attachments defined by the tube portion of which the curvature is required to end.
  • suitable guides support the cables.
  • the tube portion at the unsheathed section of the cable is retracted causing the tube to be bent in a controlled manner in the direction of the location on the tube of the tensioned cable (s) .
  • the tube can be curved in different ways to allow a simple sweeping motion of the nozzle along the surface of the waste, or more complex curvatures such as "S" shape, in order to manoeuvre the nozzle and the tube around obstacles such as columns, walls etc. which may exist within the vault.
  • the cable set(s) are tensioned from actuators located within the hose-reel where the cables, cable sheathes and conduit terminate.
  • actuators located within the hose-reel where the cables, cable sheathes and conduit terminate.
  • the conduit will assume a non-tensioned posture, thereby becoming straight and allowing retraction of the tube by rotation of the hose-reel, without exhibiting any bent shape which could cause the tube to become trapped within the vault.
  • the hose is connected to the vacuum system via the reel unit and rigid pipes or flexible hoses in a way to establish airflow into the nozzle of the tube.
  • the vacuum unit is further, via a cyclone and a lock-device, interconnected with the transport container in which the waste being sucked from the storage vault is deposited in a continuous or batch process.
  • a flexible tube 1 comprises an end portion 2 with a nozzle 3. Evenly spaced along substantially all of the tube's 1 length are fitted and attached circular support rings 4a, 4b, 4c encircling the tube 1.
  • Several manoeuvring devices in the form of control cables 7a are evenly distributed about the circumference of the tube 1 and are attached to a bottom plate 8 and are conveyed along the tube 1 and through the support rings 4a, 4b to a first actuator (not shown) integrated within a reel unit 5.
  • the tube 1 is preferably also provided with a second set of manoeuvring devices in the form of control cables 7b, which are attached to the support ring 4b at a distance from the end portion 2 of the tube 1.
  • the control cables 7b are in the same manner as described above conveyed along the tube 1 and through the support rings 4c and connected to a second actuator (not shown) integrated within the reel unit 5.
  • the nozzle 3 can be moved horizontally by the curving of the lower end portion 2 of the tube, the first actuator (not shown) retracting one or more of the control cables 7a causing the end portion 2 of the tube 1 being bent outwards, possibly by the second actuator (not shown) retracting one or more control cables 7b causing the tube 1 to curve upside the end portion 2.
  • the nozzle 3 is rotatable about an axis coinciding with the centre axis of the tube 1. The rotation is performed by means of a motor 4 and a transmission (not shown).
  • the end portion 2 includes a rotatable, mechanic agitator 9, which is capable of breaking radioactive waste 11 into fragments when the end portion 2 of the tube 1 is lowered to an accumulation of waste 11, thus forcing the agitator towards the waste 11.
  • the radioactive waste 11 is collected in a storage vault 13.
  • the storage vault 13 includes a passage 15 allowing the tube 1 to pass through.
  • the reel unit 5 is located above the storage vault 13.
  • the reel unit 5 comprises a reel 17 for the spooling of the tube 1.
  • the reel includes a motor 19 and a control unit (not shown) for the vertical and horizontal positioning of the nozzle 3 relative to the surface of the waste 11.
  • the reel unit includes requisite connections between the tube 1 and a hose 21, which in the opposite end is connected to a cyclone unit 23 integrated in a container unit 25.
  • a lock 27 is interconnecting the cyclone unit 23 and a transport container 28 through a pipe 29.
  • the cyclone unit 23 is by means of a hose 31 connected to a vacuum pump (not shown).
  • exhaust air from the vacuum pump can be directed back to the storage vault 13 through a return hose 33 and appurtenant connectors (not shown).
  • the apparatus according to the invention is located on or integrated in the structures 35 surrounding the storage vault 13.
  • the internal bore of the nozzle 3 exhibits smaller diameter and curvature radii than those of the consecutive tube and hose elements.
  • Fig. 4a and 4b exhibits an alternative embodiment of the nozzle 3, the nozzle 3 comprising two substantially uniform nozzle sections 3a, 3b, each of which upper portion is connected to a nozzle basement 3c in a hinged manner.
  • the nozzle sections 3a, 3b are interlocked by means of a locking device (not shown) being releasable by means of remote control (not shown).
  • the tube 1 When the radioactive waste 11 is to be transferred from the storage vault 13 to a transport container 28, the tube 1 is lowered through the adapted passage 15 by means of the motor 19 of the reel unit 5 being controlled by a control unit (not shown) till the nozzle is located at correct level.
  • the vacuum pump (not shown) is activated, thus obtaining suction in the nozzle 3.
  • the waste 11 is sucked upwards through the tube 1 via the hose 21 to the cyclone unit 23 where the waste 11 is separated from the transportation air and further conveyed through the lock 27 and the pipe 29 to the transport container 28.
  • Any negative pressure in the storage vault 13 is avoided by returning exhaust air from the vacuum pump (not shown) to the storage vault 13 through the hose 33 and the appurtenant connectors (not shown).
  • the nozzle 3 may be moved horizontally along the entire area of the storage vault 13 by rotating the nozzle 3 by means of the motor 4 and by bending and moving the end portion 2 of the tube 1 in a desired direction by means of the actuators (not shown) and the cables 7a, 7b.
  • the agitator 9 can be activated into motion while it bears against the waste, thus breaking the waste 11.
  • the apparatus and the method according to the invention make it possible to bring out the waste in one single operation, which lead to less intervention by the operator who is performing the process and assures that equipment, which may be an object of mechanic malfunction, are located outside the enclosure, thus offering the staff access to the equipment for repair and maintenance.
  • the apparatus may be supplemented by miscellaneous types of tools to allow different operations to be performed inside the storage vault, such as cutting and removing large components for easier removal from the vault.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • High Energy & Nuclear Physics (AREA)
  • Processing Of Solid Wastes (AREA)
  • Sampling And Sample Adjustment (AREA)
  • Air Transport Of Granular Materials (AREA)
  • Refuse Collection And Transfer (AREA)
  • Cleaning In General (AREA)
EP05270003A 2004-02-27 2005-02-25 Apparat und Verfahren zum Entfernen von radioaktivem Material aus einem unschlossenem Raum Not-in-force EP1568888B1 (de)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
NO20040882 2004-02-27
NO20040882A NO20040882D0 (no) 2004-02-27 2004-02-27 Apparat og framgangsmate for innsamling av radioaktivt materiale fra en sikkerhetsbeholder.
NO20050975A NO321595B1 (no) 2004-02-27 2005-02-23 Apparat og framgangsmate for innsamling av radioaktivt materiale fra en lagringsbeholder
NO20050975 2005-02-23

Publications (2)

Publication Number Publication Date
EP1568888A1 true EP1568888A1 (de) 2005-08-31
EP1568888B1 EP1568888B1 (de) 2010-03-03

Family

ID=34752279

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05270003A Not-in-force EP1568888B1 (de) 2004-02-27 2005-02-25 Apparat und Verfahren zum Entfernen von radioaktivem Material aus einem unschlossenem Raum

Country Status (5)

Country Link
EP (1) EP1568888B1 (de)
AT (1) ATE459804T1 (de)
DE (1) DE602005019642D1 (de)
ES (1) ES2342300T3 (de)
NO (1) NO321595B1 (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2449845A (en) * 2007-05-25 2008-12-10 Ukaea Ltd Means for removing residual liquid metal coolant from a nuclear reactor
JP2016512162A (ja) * 2013-03-08 2016-04-25 ザイレコ，インコーポレイテッド プロセスガスの制御
CN113823432A (zh) * 2021-08-10 2021-12-21 中国核电工程有限公司 一种放射性浆液倒空系统及方法

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102010002436B3 (de) * 2010-02-26 2011-07-21 AREVA NP GmbH, 91052 Einrichtung und Verfahren zum Entfernen von Fremdkörpern vom Boden eines Reaktordruckbehälters

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4235569A (en) * 1977-03-31 1980-11-25 Alois Schillinger Submersible pump for radioactive liquids
US4561428A (en) * 1983-07-18 1985-12-31 Olympus Optical Company Ltd. Suction controller of endoscopes
EP0294626A2 (de) * 1987-06-10 1988-12-14 Hans-Jörg Dr.med. Kellner Endoskop
US4924898A (en) * 1987-06-16 1990-05-15 The Gni Group, Inc. Vacuum assisted material mover
JPH07214096A (ja) * 1994-02-07 1995-08-15 Morita Tokushu Kiko Kk 沈殿汚泥の清掃方法およびそれに用いられる先端吸引装置
EP0730094A1 (de) * 1995-03-03 1996-09-04 Westinghouse Electric Corporation Variabler Pegelabsaugvorrichtung
JPH1020089A (ja) * 1996-07-03 1998-01-23 Ishikawajima Inspection & Instrumentation Co 放射性廃液タンク内のクラッド回収装置

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4235569A (en) * 1977-03-31 1980-11-25 Alois Schillinger Submersible pump for radioactive liquids
US4561428A (en) * 1983-07-18 1985-12-31 Olympus Optical Company Ltd. Suction controller of endoscopes
EP0294626A2 (de) * 1987-06-10 1988-12-14 Hans-Jörg Dr.med. Kellner Endoskop
US4924898A (en) * 1987-06-16 1990-05-15 The Gni Group, Inc. Vacuum assisted material mover
JPH07214096A (ja) * 1994-02-07 1995-08-15 Morita Tokushu Kiko Kk 沈殿汚泥の清掃方法およびそれに用いられる先端吸引装置
EP0730094A1 (de) * 1995-03-03 1996-09-04 Westinghouse Electric Corporation Variabler Pegelabsaugvorrichtung
JPH1020089A (ja) * 1996-07-03 1998-01-23 Ishikawajima Inspection & Instrumentation Co 放射性廃液タンク内のクラッド回収装置

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 1995, no. 11 26 December 1995 (1995-12-26) *
PATENT ABSTRACTS OF JAPAN vol. 1998, no. 05 30 April 1998 (1998-04-30) *

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2449845A (en) * 2007-05-25 2008-12-10 Ukaea Ltd Means for removing residual liquid metal coolant from a nuclear reactor
JP2016512162A (ja) * 2013-03-08 2016-04-25 ザイレコ，インコーポレイテッド プロセスガスの制御
US10294612B2 (en) 2013-03-08 2019-05-21 Xyleco, Inc. Controlling process gases
CN113823432A (zh) * 2021-08-10 2021-12-21 中国核电工程有限公司 一种放射性浆液倒空系统及方法
CN113823432B (zh) * 2021-08-10 2024-01-23 中国核电工程有限公司 一种放射性浆液倒空系统及方法

Also Published As

Publication number Publication date
NO20050975L (no) 2005-08-29
NO20050975D0 (no) 2005-02-23
ATE459804T1 (de) 2010-03-15
NO321595B1 (no) 2006-06-06
DE602005019642D1 (de) 2010-04-15
EP1568888B1 (de) 2010-03-03
ES2342300T3 (es) 2010-07-05

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