EP0388296A1 - Interventionsvorrichtung, insbesondere zur Prüfung, Inspektion und Wartung von Wärmeaustauschern - Google Patents

Interventionsvorrichtung, insbesondere zur Prüfung, Inspektion und Wartung von Wärmeaustauschern Download PDF

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Publication number
EP0388296A1
EP0388296A1 EP90400681A EP90400681A EP0388296A1 EP 0388296 A1 EP0388296 A1 EP 0388296A1 EP 90400681 A EP90400681 A EP 90400681A EP 90400681 A EP90400681 A EP 90400681A EP 0388296 A1 EP0388296 A1 EP 0388296A1
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EP
European Patent Office
Prior art keywords
plate
axis
perforations
plates
intervention
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
EP90400681A
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English (en)
French (fr)
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EP0388296B1 (de
Inventor
Luc Lebourgeois
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.)
Intercontrole SA
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Intercontrole SA
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Filing date
Publication date
Application filed by Intercontrole SA filed Critical Intercontrole SA
Publication of EP0388296A1 publication Critical patent/EP0388296A1/de
Application granted granted Critical
Publication of EP0388296B1 publication Critical patent/EP0388296B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F9/00—Casings; Header boxes; Auxiliary supports for elements; Auxiliary members within casings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
    • F22B37/00—Component parts or details of steam boilers
    • F22B37/002—Component parts or details of steam boilers specially adapted for nuclear steam generators, e.g. maintenance, repairing or inspecting equipment not otherwise provided for
    • F22B37/006—Walking equipment, e.g. walking platforms suspended at the tube sheet
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S165/00—Heat exchange
    • Y10S165/001—Heat exchange with alarm, indicator, recorder, test, or inspection means
    • Y10S165/003—Remote control inspection means

Definitions

  • the invention relates to an intervention device capable of hooking into the perforations of a tube plate of a heat exchanger fitted to a nuclear reactor and of moving on this plate, to carry out interventions such as operations of control, inspection and maintenance inside the exchanger tubes at the end of these tubes or on any other accessible part of the exchanger, using appropriate intervention tools.
  • the first category illustrated in particular by document FR-A-2 309 314, there are mobile devices which move by crawling on the tube plate of the steam generator.
  • These devices called “spiders”, include a body in two parts able to move relative to each other in two orthogonal directions, parallel to the tube plate.
  • Each of these parts of the device body is fitted with fastening means capable of engaging in the perforations of the tube plate.
  • these attachment means also have the possibility of displacement in a direction perpendicular to the tube plate.
  • Intervention devices belonging to this first category have various drawbacks.
  • the structure of the device limits its possibilities of movement to two imposed directions and according to an advance corresponding to the pitch of the network of perforations. As soon as the pitch of the network is changed, a different intervention device must therefore be used. and these devices cannot be used when the perforations are not arranged in the two imposed directions.
  • these limited displacement possibilities mean that certain tubes cannot be accessed when perforations are blocked or nonexistent.
  • these devices include an anchoring block which is fixed at a well-determined point on the tube plate, so as to define a fixed point from which extends a arm, articulated or not, which supports an intervention tool at its free end.
  • This type of device is illustrated in particular by the "ROSA" manipulator from the Westinghouse Company.
  • Such an intervention device generally has greater flexibility of use than mobile devices and can in particular be adapted to tube plates, the perforations of which are arranged in different networks and some of which may be blocked or nonexistent.
  • it has in common with mobile intervention devices that interventions can only be made when all the organs that constitute it are immobile and perfectly positioned relative to the tube plate.
  • the introduction of the intervention device into the exchanger also usually requires human intervention.
  • the anchoring block serving as a fixed point bears on the bottom of the exchanger cavity in which this device is placed, it is necessary to use different devices in exchangers having cavities of different dimensions.
  • the subject of the invention is precisely a mobile-type intervention device whose new, particularly simple design allows it to combine the advantages of mobile intervention devices and fixed-point intervention devices of the prior art, without present the disadvantages.
  • the subject of the invention is a mobile intervention device designed so that it can be used on tube plates having perforations which may be closed off and arranged in any network, regardless of the dimensions of the cavity in which it is received, this device can also be inserted and extracted remotely and making it possible to carry out interventions at any time, even when it is moving.
  • an intervention device capable of hooking into the perforations of a tube plate of a heat exchanger and of moving on this plate, characterized by the fact that he understands: - an articulated link arm formed of at least two rigid segments connected together by a joint defining a first axis; - two wrists mounted at each end of the link arm and each defining two degrees of freedom of rotation around a second and a third orthogonal axis therebetween; - Two plates supported respectively by each of the wrists and each comprising means for supporting at least one intervention tool and attachment means capable of engaging in the perforations of the plate; and - motorization means capable of controlling pivoting around the first, second and third axes.
  • a device thus designed has degrees of freedom which allow it to adapt to all types of perforation networks.
  • an intervention is always possible on the plate whose hooking means are engaged in the perforations of the tube plate, while the second plate is moving. Since the travel time is much less than the duration of an intervention, two interventions can practically be carried out simultaneously, which constitutes a decisive time saving compared to current devices.
  • the intervention device according to the invention also makes it possible to adapt to the case where the tube plate comprises blocked or non-drilled tubes which would prohibit intervention on certain tubes with the existing devices. Indeed, the degrees of freedom of the wrists then allow, in many cases, to hang the tray in another position. In addition, if such a hooking is still impossible, the intervention can still be done using the device in the manner of a fixed point device hooked to the plate by the plate opposite to that carrying the tool which performs the 'intervention.
  • the first axis is orthogonal to a longitudinal axis of each of the segments and each of the second axes is parallel to this first axis. Since the plates have a suitable flat surface coming to bear on the tube plate, each of the third axes is then perpendicular to the flat surface of the plate supported by the wrist comprising this third axis.
  • the articulated link arm preferably has a maximum length such that, when the hooking means of one of the plates are engaged in the perforations of the tube plate, the other plate is located in a manhole formed in an outer casing of the heat exchanger or outside of the latter.
  • the device further comprises a table provided with perforations in which the hooking means of the plates can come into engagement, and lifting means making it possible to move this table between a low position, relatively distant from the heat exchanger. heat, and a high position, located opposite the manhole, in the immediate vicinity of the outer shell of the exchanger.
  • the plates are advantageously mounted on the wrists in a removable manner by removable fixing means.
  • FIG. 1 a part of the lower end of a steam generator of a nuclear reactor is shown diagrammatically, in which the intervention device according to the invention can be used.
  • the intervention device according to the invention can be used in heat exchangers of different types, such as condensers.
  • the steam generator partially shown in Figure 1 comprises an outer casing 10 having a vertical axis of symmetry.
  • a horizontal tube plate 12 is connected to the casing 10 to delimit with the hemispherical bottom of the latter a primary cavity 14, generally called a water box.
  • This cavity 14 is divided into an entry area and an exit area by a vertical partition 16.
  • a manhole 18 normally closed by a door (not shown tee) is formed in the hemispherical lower part of the envelope 10, in order to allow access to each of the entry and exit zones of the primary cavity 14.
  • a bundle of inverted U-shaped tubes 20 is connected to perforations 20a of the tube plate 12, so that each of these tubes opens at opposite ends respectively into the entry zone and into the exit zone of the primary cavity 14.
  • the perforations 20a of the plate 12 tubes are arranged in a network whose shape and pitch can vary depending on the type of steam generator considered.
  • an intervention device 22 is used to remotely carry out all the tasks which must be carried out inside the steam generator.
  • these tasks there will be mentioned in particular the control, inspection and maintenance of the tubes 20 or of any other part accessible to the device. It is important to note that this device can be used regardless of the nature of the tasks to be performed, so that the list of tasks which has just been given should not be considered as limiting.
  • the intervention device 22 is provided for catching in the perforations 20a of the tube plate 12. It is also provided for moving on this plate 12, so as to be able to access the entire surface of the tube plate, whatever the shape and the pitch of the network formed by the perforations 20a, and despite the possible presence of blocked or non-pierced tubes, or bulky obstacles.
  • FIG. 1 In order to illustrate the possibilities of introducing the intervention device 22 into the primary cavity 14 of the steam generator remotely and without human intervention, this device is represented in FIG. 1 in three different positions I, II and III which will be explained later. Previously, the structure of the intervention device 22 will be described briefly with reference to FIGS. 1 and 2.
  • the intervention device 22 firstly comprises an articulated connecting arm formed by two rigid segments 24a and 24b connected together by a hinge 26. Over most of their length, the rigid segments 24a and 24b have longitudinal axes rectilinear which are orthogonal to the pivot axis A defined by articulation 26.
  • the rigid segments 24a and 24b are of the same length and bear at their ends opposite the articulation 26 of the wrists 28a and 28b respectively.
  • Each of these wrists defines two degrees of freedom of rotation about an axis B parallel to the axis A and an axis C orthogonal to the axis B.
  • Each wrist 28a and 28b supports a plate 30a and 30b having a flat surface 31a, 31b capable of coming to bear on the underside of the tube plate 12 and oriented perpendicular to the axis C of the wrist supporting this plate.
  • Each of the plates 30a and 30b of the intervention device comprises hooking means constituted by expandable members 32 which protrude beyond the flat face 31a, so as to be able to come into engagement in the perforations 20a of the plate to tubes 12.
  • Each plate 30a supports for example four expandable members 32, arranged for example in a square as illustrated in FIG. 2, in accordance with the network formed by the perforations 20a.
  • Each of the plates 30a and 30b also includes a support 34 in which an intervention tool adapted to the task to be performed can be mounted.
  • motorization means which will be described later make it possible to control the relative rotational movements around the axes A, B and C.
  • the intervention device 22 can move on the tube plate practically without limitation, since the degrees of freedom around the axes B and C presented by each of the wrists 28a and 28b make it possible to bring one of the plates, such as the plate 30b opposite any point of the tube plate when the other plate, for example 30a, is fixed on the latter by its expandable members 32. It is thus possible to position and orient the plate 30b in such a way that its expandable members can be introduced into the perforations 20a, even when some of these perforations are blocked or absent.
  • each of the plates 30a, 30b includes a support 34 capable of receiving a tool
  • the device is moved while one of the tools is in operation.
  • the travel time is generally much less than the time necessary for an intervention, it can therefore be considered that the device according to the invention allows two simultaneous interventions on two different tubes included in the field of action of this device, without a rule fixed and imposed by the intervention device governs the relationship between the Cartesian coordinates of these two tubes.
  • the intervention device 22 is advantageously dimensioned so that the maximum length of the articulated connecting arm constituted by the two rigid segments 24a and 24b is such that, when the expandable members 32 associated to one of the plates such as the plate 30a are engaged in the perforations 20a of the tube plate, the plate 30b is located in the manhole 18 or outside the steam generator.
  • the table 36 is placed in the low position and the expandable members of one of the plates, for example the plate 30b, are introduced into perforations 36a formed for this purpose on the upper face of the table 36.
  • the device 22 being placed in its fully expanded position, the introduction of the device inside the steam generator can be remotely controlled using an appropriate motorization system associated with the carriage 40 (position I on the figure 1). These motorization means make it possible to raise the table 36 carrying the intervention device 22, following a trajectory such that this device progressively penetrates into the primary cavity 14.
  • each of the movements of the intervention device 22 is controlled by an appropriate motorization, it is thus possible, either by means of prior programming, or by manual control permitted thanks to the information provided by one or more cameras mounted, by example, on the plates 30a and 30b, bring the expandable members 32 of the other plate 30a opposite the perforations 20a of the tube plate 12 (position II in FIG. 1).
  • the table 36 then occupies a high position located approximately at the level of the manhole 18.
  • the attachment of the plate 30a is thus carried out on the tube plate.
  • the expandable members 32 of the tray 30a are fixed in the perforations 20a of the tube plate 12, the expandable members associated with the tray 30b can be released so as to separate the latter tray from the table 36.
  • the latter is then lowered at least partially along the rail 38 and the device 22 can move to carry out the interventions to be carried out (position III in FIG. 1).
  • the motorization means are shown making it possible to control the relative pivoting of the rigid segments 24a and 24b about their articulation axis A. It should be noted that these motorization means are identical to those which make it possible to control , in each of the wrists 28a and 28b, the pivoting around the axes B.
  • the rigid segment 24a carries a tubular external part 42 centered on the axis A.
  • This external part 42 rotatably supports an internal tubular part 44, by means of two bearings 46.
  • the stator 48a of an electric motor 48 is fixed inside the external part 42, in a position offset along the axis A relative to the internal part 44.
  • the rotor 48b of the motor 48 is fixed on a shaft 50 centered on the axis A and rotatably supported both in the part 42 and in the part 44, by means of two bearings 52.
  • the motor 48 thus controls a relative rotation between the shaft 50 and the external part 48.
  • This rotation is transmitted from the shaft 50 to the part 44 by a speed reduction mechanism 54 of the "Harmonic-drive" type.
  • This reduction gear shown very diagrammatically in FIG. 3, comprises in a known manner a deformable satellite 54a, mounted on the shaft 50 by an elliptical bearing, and which engages simultaneously on a sun gear 54b fixed to the external part 42 and on a planetary 54c fixed to the inner part 44.
  • the end of the second rigid segment 24b corresponding to the articulation 26 is fixed to the part 44 by means of a disconnectable connection mechanism 56.
  • This mechanism comprises a dish 64 in the form of a bowl, fixed by its peripheral part to the part 44, on the side opposite to the motor 48, by means of screws 65.
  • the bottom of the plate 64 projects outwards, away from the motor 48, and comprises in its center, placed on the axis A, an approximately rectangular slot 62.
  • a cylindrical rod 58 is mounted along the axis A in a bore 59 formed in the segment 24b.
  • the end of the rod 58 located on the side of the plate 64 comprises a head 60 provided with flats allowing it to pass through the slot 62, or on the contrary to be in abutment on the plate 64, according to its orientation around the axis A
  • This orientation is limited by a circular arc groove 61 formed on the rod 58 and into which a screw 76 mounted in the end of the segment 24b penetrates.
  • the cooperation of the screw 76 with the groove 61 also limits the axial movement of the rod 58 inside the bore 59.
  • the rod 58 In its part opposite the head 60, the rod 58 has a threaded end 63 which projects into a recess 65 formed on the outer face of the segment 24b, along the axis A.
  • a nut 67 screwed onto the threaded end 63 of the rod 58 is supported on a cylindrical rod 69 of axis perpendicular to the axis A, this rod 69 being crossed by the threaded end 63.
  • the cylindrical rod 69 is rotatably mounted on an operating lever 66 provided with a cam surface 66a eccentric with respect to the axis of the rod 69.
  • the lever 66 is normally held against the exterior surface of the segment 24b by a latch 70 as illustrated in FIG. 4. Any rotation of the rod 58 is then impossible and the orientation of the head 60 relative to the opening 62 is such that the segment 24b is secured to the plate 64.
  • Complementary frustoconical surfaces formed on these two parts then make it possible to ensure correct centering around the axis A.
  • these two parts cooperate by lugs 72 fixed on the plate 64 and penetrating into notches 74 formed in the segment 24b, as illustrated in FIG. 5, so that their relative angular positioning is ensured precisely.
  • the lock 70 is unlocked and the lever 66 is pivoted around the rod 69.
  • the rod 58 Given that the axis of this rod is eccentric relative to the axis of the cam surface 66a, the rod 58 then moves slightly to the left when considering FIG. 4, under the action of the spring 68. A rotation of about 90 o around the axis A of the assembly formed by the rod 58 and the lever 66 is then made possible. This rotation has the effect of bringing the head 60 into a position allowing it to pass through the slot 62 of the plate 64. The segment 24b can then be detached. laughed effortlessly from segment 24a.
  • the reference 78 generally designates a geared motor assembly similar to that which has been described previously with reference to FIG. 3, making it possible to control the pivoting movement around the axis B between the segment 24a and a square-shaped part 80 belonging for example to the wrist 28a.
  • the structure of the wrists 28a and 28b and of the plates 30a and 30b being identical, the description which follows of the wrist 28a and of the plate 30a also applies to the wrist 28b and to the plate 30b.
  • the square-shaped part 80 is fixed by means of screws (not shown) on the part 44 (FIG. 3) of the geared motor assembly 78, so that it can rotate around the axis B.
  • this part 80 rotatably supports, around the axis C, which is perpendicular to the axis B, an annular part 92, by means of a bearing 82.
  • the square-shaped part 80 also supports a second geared motor assembly 84 whose output shaft 86, of axis parallel to the axis C, drives a pinion 88 which meshes in an internal toothed ring 90 of the part 92.
  • An actuation of the geared motor assembly 84 thus makes it possible to control a pivoting of the part 92 around the axis C, relative to the part in the form of a square 80.
  • the plate 30a is removably attached to the annular part 92 for example by means of screws 95.
  • the plate 30a supports the expandable members 32 as well as the support 34 of the intervention tool, and it has the flat surface 31a, perpendicular to the axis C, capable of coming to bear on the underside of the tube plate 12.
  • the expandable members 32 can be produced in any way, according to techniques well known to specialists. Thus and only by way of example, these members may comprise a segmented tubular part whose increase in diameter is controlled by the axial displacement of a ball actuated by a pneumatic cylinder. Conduits 96 allowing the control fluid to be conveyed from these jacks are then provided in the annular part 92, as illustrated in FIG. 6.
  • the control of the electric motors ensuring the various movements of the axes A, B and C, as well as the control of the expandable members 32 are carried out remotely, by means of a set of cables and conduits shown very schematically at 98 on the figure 1. These cables and conduits can also be used to convey other information, such as information delivered by coders (not shown) which can be associated with each of the gearmotor assemblies and by cameras which can in particular be mounted on the plates 30a and 30b or any other point inside the primary cavity 14 of the exchanger.
  • the intervention device according to the invention is remotely controlled, by means of a control system 100 to which the cables and pipes 98 terminate and which can be produced in different ways.
  • a "sight" command can be envisaged with the help of the information provided by the cameras.
  • This "sight" command can also be supplemented by means for controlling the various movements between them, making it possible to maintain the intervention device permanently in a posture favoring the introduction of the expandable members 32 into the perforations 20a of the plate. with tubes, during its displacement.
  • the invention is not limited to the embodiment which has just been described by way of example, but covers all its variants.
  • the articulated link arm can be formed of three or more rigid segments, in certain specific cases, and that these segments can be of equal length or of different lengths.
  • each of the plates can support more than one tool and that the removable nature of the articulation connecting the two segments of the arm can be eliminated or produced differently.
  • the removable nature of the trays can also be eliminated in certain applications.
  • the lifting means making it possible to move the table carrying the device when it is inserted into the steam generator and when it is extracted can be produced in a different way, for example by means of several rails or a cable system.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • High Energy & Nuclear Physics (AREA)
  • Monitoring And Testing Of Nuclear Reactors (AREA)
  • Manipulator (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
EP90400681A 1989-03-16 1990-03-14 Interventionsvorrichtung, insbesondere zur Prüfung, Inspektion und Wartung von Wärmeaustauschern Expired - Lifetime EP0388296B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8903468A FR2644568B1 (fr) 1989-03-16 1989-03-16 Dispositif d'intervention, notamment pour le controle, l'inspection et la maintenance des echangeurs de chaleur
FR8903468 1989-03-16

Publications (2)

Publication Number Publication Date
EP0388296A1 true EP0388296A1 (de) 1990-09-19
EP0388296B1 EP0388296B1 (de) 1993-11-18

Family

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Application Number Title Priority Date Filing Date
EP90400681A Expired - Lifetime EP0388296B1 (de) 1989-03-16 1990-03-14 Interventionsvorrichtung, insbesondere zur Prüfung, Inspektion und Wartung von Wärmeaustauschern

Country Status (10)

Country Link
US (1) US4984627A (de)
EP (1) EP0388296B1 (de)
JP (1) JP2950890B2 (de)
KR (1) KR0167991B1 (de)
CN (1) CN1018579B (de)
DD (1) DD297870A5 (de)
DE (1) DE69004602T2 (de)
ES (1) ES2047868T3 (de)
FR (1) FR2644568B1 (de)
RU (1) RU1808071C (de)

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US5305356B1 (en) * 1992-05-14 1998-09-01 Brooks Support Systems Inc Inspection device
US6814169B2 (en) * 2001-11-27 2004-11-09 Siemens Westinghouse Power Corporation Interchangeable accessories for a remote controlled inspection vehicle
US6606920B2 (en) * 2002-01-03 2003-08-19 Westinghouse Electric Company Llc Tube non-destructive testing probe drive elevator and contamination containment system
US6889760B2 (en) * 2002-05-03 2005-05-10 Hudson Products Corporation Heat shield
US7314343B2 (en) * 2002-07-22 2008-01-01 Westinghouse Electric Co. Llc Miniature manipulator for servicing the interior of nuclear steam generator tubes
US7533715B1 (en) * 2003-09-26 2009-05-19 Areva Np Inc. Tube walker for examination and repair of steam generators
US8746089B2 (en) 2009-01-19 2014-06-10 Babcock & Wilcox Nuclear Energy, Inc. Apparatus for automated positioning of eddy current test probe
US7961462B2 (en) * 2009-05-28 2011-06-14 Alcatel Lucent Use of vortex generators to improve efficacy of heat sinks used to cool electrical and electro-optical components
JP5314609B2 (ja) * 2010-01-27 2013-10-16 三菱重工業株式会社 水室内作業装置
JP5656674B2 (ja) * 2011-02-02 2015-01-21 三菱重工業株式会社 伝熱管の検査装置および検査方法
US20120224663A1 (en) * 2011-03-01 2012-09-06 Westinghouse Electric Company Llc. Nuclear steam generator support and alignment structure
CN103640531B (zh) * 2013-12-08 2016-01-06 中国科学院合肥物质科学研究院 用于核聚变装置的部件转运车车厢控制系统及其控制方法
CN103861540B (zh) * 2014-03-31 2015-04-01 衢州图艺工业设计有限公司 一种横撑型反应釜检修装置
RU2662655C1 (ru) * 2017-10-04 2018-07-26 Общество с ограниченной ответственностью Научно-производственное предприятие "Альфа-Диагностика" Манипулятор для проведения ремонтных работ в коллекторе парогенератора ядерного реактора типа ВВЭР
CA3083053A1 (en) * 2019-06-07 2020-12-07 Battelle Memorial Institute Heat exchanger assemblies and methods
RU205323U1 (ru) * 2021-03-26 2021-07-08 Акционерное общество «Атомэнергоремонт» Манипулятор для глушения теплообменных труб в коллекторе парогенератора

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DE2755733A1 (de) * 1977-06-13 1978-12-14 Westinghouse Electric Corp Manipulator mit nachfolgesteuerung (master-slave-manipulator)
EP0010175A1 (de) * 1978-10-18 1980-04-30 Westinghouse Electric Corporation Verfahren zur Wartung eines Dampferzeugers

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FR2519576B1 (fr) * 1982-01-11 1985-11-29 Int Robotic Engineerin Robot a pattes grimpeur
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EP0010175A1 (de) * 1978-10-18 1980-04-30 Westinghouse Electric Corporation Verfahren zur Wartung eines Dampferzeugers

Also Published As

Publication number Publication date
CN1045452A (zh) 1990-09-19
CN1018579B (zh) 1992-10-07
US4984627A (en) 1991-01-15
EP0388296B1 (de) 1993-11-18
DE69004602D1 (de) 1993-12-23
FR2644568B1 (fr) 1991-07-05
JPH02280094A (ja) 1990-11-16
DE69004602T2 (de) 1994-05-19
ES2047868T3 (es) 1994-03-01
JP2950890B2 (ja) 1999-09-20
KR0167991B1 (ko) 1999-01-15
RU1808071C (ru) 1993-04-07
FR2644568A1 (fr) 1990-09-21
KR900014848A (ko) 1990-10-25
DD297870A5 (de) 1992-01-23

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