EP0537039A1 - Beweglicher Träger für Intervention in der Sekundärseite eines Dampferzeugers eines nuklearen Druckwasserreaktors - Google Patents

Beweglicher Träger für Intervention in der Sekundärseite eines Dampferzeugers eines nuklearen Druckwasserreaktors Download PDF

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Publication number
EP0537039A1
EP0537039A1 EP92402542A EP92402542A EP0537039A1 EP 0537039 A1 EP0537039 A1 EP 0537039A1 EP 92402542 A EP92402542 A EP 92402542A EP 92402542 A EP92402542 A EP 92402542A EP 0537039 A1 EP0537039 A1 EP 0537039A1
Authority
EP
European Patent Office
Prior art keywords
central body
bundle
envelope
rods
annular space
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.)
Withdrawn
Application number
EP92402542A
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English (en)
French (fr)
Inventor
Antoine Cacciuttolo
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.)
Areva NP SAS
Original Assignee
Framatome SA
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
Application filed by Framatome SA filed Critical Framatome SA
Publication of EP0537039A1 publication Critical patent/EP0537039A1/de
Withdrawn legal-status Critical Current

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    • 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

Definitions

  • the invention relates to a mobile carrying device for carrying out television inspection operations and / or interventions in the secondary part of a steam generator of a pressurized water nuclear reactor.
  • the steam generators of pressurized water nuclear reactors comprise an outer casing of generally cylindrical shape enclosing a bundle of tubes bent into a U and embedded at their ends in a tubular plate, constituting the exchange part of the bundle.
  • the tubular plate is connected to the external envelope and separates the interior volume of the steam generator into a primary part delimited by a generally hemispherical water box situated below the tubular plate and communicating with the interior volume of the tubes of the bundle and a secondary part comprising the interior volume of the external envelope situated above the tube plate and in which the bundle of tubes is arranged.
  • a first exchange fluid constituted by the primary water ensuring the cooling of the reactor core is introduced into a first part of the water box, circulates inside the tubes of the bundle then is recovered in a second part of the box with water, before being evacuated outside the steam generator and then reintroduced into the nuclear reactor vessel.
  • a second exchange fluid consisting of feed water is introduced into the secondary part of the steam generator, in which this feed water comes into thermal contact with the primary fluid through the wall of the bundle tubes.
  • the heat exchange with the primary fluid heats and vaporizes the feed water and the steam produced is dried and then discharged at the end upper part of the secondary part of the steam generator.
  • the bundle of steam generator tubes is arranged inside a bundle envelope placed coaxially inside the outer envelope of the steam generator, substantially over the entire height of the bundle and having a lower end. located at a certain distance above the tube plate of the steam generator.
  • the area of the secondary part of the steam generator in which the bundle is disposed is therefore accessible from the lower end of the bundle envelope, an inspection or intervention device being able to be introduced into the space provided between the 'lower end of the bundle casing and the tube plate.
  • the bundle envelope has a diameter substantially smaller than the inside diameter of the outer envelope, so that there remains an annular space between these two envelopes, along the entire height of the beam. This annular space opens into the inner part of the bundle envelope, at its lower part.
  • the inspection operations of the secondary part of the steam generator may consist in particular of carrying out an inspection using a television device of the external surface of the tubes, to assess their appearance and their condition, after a certain time of operation of the steam generator during which certain damage to the bundle tubes may have occurred, for example under the effect of corrosion by the supply water or by contact with foreign bodies.
  • Interventions in the steam generator can consist in extracting foreign bodies which are lodged between the tubes of the bundle.
  • the object of the invention is therefore to propose a mobile carrying device for carrying out television inspection operations and interventions in the secondary part of a steam generator
  • a mobile carrying device for carrying out television inspection operations and interventions in the secondary part of a steam generator
  • an outer casing of generally cylindrical shape traversed by at least one opening or fist hole, a bundle of exchange tubes fixed at their ends in a tubular plate separating the interior volume of the steam generator into a primary part communicating with the interior space of the tubes and a secondary part containing the bundle of tubes and a bundle casing arranged around the bundle coaxially inside the outer casing, one end of which is located in the vicinity of the tube plate and is spaced therefrom by a certain distance, the movable carrier being moved in an annular space formed between the bundle envelope and the external envelope, this carrier device allowing to intervene at any point of the lower secondary part of the steam generator in the vicinity of the tube plate and being able to be moved in a simple manner and according to an easily automated procedure.
  • Figure 1 is an exploded perspective view of a steam generator of a pressurized water nuclear reactor.
  • FIG. 2 is an enlarged sectional view of part of the steam generator shown in FIG. 1.
  • Figure 3 is an elevational view of a carrier device according to the invention and according to a first alternative embodiment.
  • FIG. 4 is a top view along line 4 in FIG. 3.
  • FIG. 5 is a view in partial section and in elevation along 5-5 of FIG. 3.
  • Figure 6 is a sectional view through a vertical plane of the central body of the device shown in Figure 3 comprising the carrier displacement cylinders.
  • Figure 7 is an elevational view of a mobile carrier according to the invention and according to a second alternative embodiment.
  • FIG. 8 is a side elevation view along 8 in FIG. 7.
  • FIG. 9 is a view on a larger scale in elevation and in partial section of a part of the carrier device shown in FIG. 7.
  • a steam generator generally designated by the reference 1 having an outer casing 2 of generally cylindrical shape whose upper part has a larger diameter than the lower part, a tubular plate 3 in which are fixed the tubes 5 of the bundle 4 of the steam generator, by their end part and a water box 7 delimited by a hemispherical envelope traversed by pipes 6a and 6b on either side of a partition 8 separating the box water 7 in two parts.
  • the tube plate 3 is fixed to the lower part of the external envelope 2 which delimits the secondary part of the steam generator containing the bundle 4.
  • the hemispherical envelope of the water box 7 is fixed under the tubular plate and constitutes the primary part of the steam generator communicating with the interior space of the tubes 5 of the bundle 4.
  • the bundle 4 is disposed inside a bundle envelope 9 placed inside the outer envelope 2 in a coaxial arrangement.
  • Supply water is introduced into the secondary part of the steam generator through a tube 11 passing through the external envelope 2, above the upper part of the bundle 4.
  • the feed water entering through the tubing 11 circulates in an annular space 13 formed between the outer casing 2 and the bundle casing 9 to reach the lower part of the bundle casing 9 located above and at a certain distance from the upper face of the tube plate 3.
  • the supply water enters the interior of the bundle envelope through the opening formed between the lower end of the bundle envelope 9 and the plate tubular 3 and bringing the annular space 13 into communication with the interior volume of the bundle envelope 9.
  • the feed water comes into contact with the tubes 5, heats up in contact with the tubes in which the primary water circulates and circulates in the vertical direction and from bottom to top inside the bundle envelope, in contact with the tubes 5.
  • the heat exchange between the primary water and the feed water through the wall of the tubes 5 heats up and then evaporates the feed water, the vapor formed being dried in the part of the steam generator above of the bundle 4 then discharged through the tube 12 placed at the upper end of the envelope 2 of the steam generator.
  • Each of the tubes 5 of the bundle 4 communicates with a first part of the water box 7 by one of its ends and with a second part of the water box by its other end. This ensures primary water circulation inside the bundle tubes.
  • the tubes 5 of the bundle 4 which are bent in a U at their upper part and held by horizontal spacer plates 10 and regularly spaced along the height of the bundle are arranged so as to constitute vertical parallel rows and a regular network with circular section in transverse planes of horizontal direction.
  • the beam has the shape of a symmetrical volume of revolution around the vertical axis of the steam generator delimited at its upper part by a hemispherical surface.
  • the external envelope 2 of the steam generator is crossed by a small opening 15 or fist hole, in the lower part of the annular space 13 formed between the bundle envelope 9 and the outer shell 2.
  • the carrier device which will be described below makes it possible to move a television inspection means or a tool along the entire circumference of the beam 4, for example to carry out a control and an examination of the part of the tubes 5 located between the lower end of the bundle envelope 9 and the upper face 3b of the tube plate 3.
  • the intervention means inside the steam generator must be introduced through the fist hole 15 passing through the external envelope 2.
  • FIG 3 there is shown a mobile carrier device according to the invention and according to a first alternative embodiment.
  • the carrier device generally designated by the reference 18 has been represented inside the secondary part of a steam generator which is shown diagrammatically by the lower edge 9a of the bundle envelope 9 and by the inspection opening. or fist hole 15.
  • the device 18 comprises a central body 20 carrying a fixing head 21 constituted by an inflatable flexible envelope in two parts of substantially cylindrical shape as well as two jacks 22a, 22b placed in transverse arrangements on either side of the central body 20 and each carrying an inflatable flexible head, respectively 23a, 23b.
  • the inflatable flexible head 21 placed in a central arrangement relative to the heads 23a and 23b is carried by a jack 24 whose rod is perpendicular to the rods of the jacks 22a and 22b.
  • the rod of the jack 24 is disposed in a direction vertical and the rods of the jacks 22a and 22b in horizontal directions and slightly inclined with respect to each other, as can be seen in FIG. 4.
  • the central body 20 also carries, in an arrangement opposite the jack 24 and the flexible head 21, a guide assembly 25 comprising two arms 25a and 25b constituted by flexible metal blades such as spring blades fixed in an inclined position relative to the central axis of the carrier on either side of this central axis ZZ ′ which is placed in a vertical position when the carrier device 18 is in service inside the steam generator.
  • a guide assembly 25 comprising two arms 25a and 25b constituted by flexible metal blades such as spring blades fixed in an inclined position relative to the central axis of the carrier on either side of this central axis ZZ ′ which is placed in a vertical position when the carrier device 18 is in service inside the steam generator.
  • Each of the arms 25a and 25b carries at its end opposite to its attachment to the central body 20, a roller 26a (or 26b) rotatably mounted at the end of the corresponding arm and intended to bear against the lower edge 9a of the bundle envelope 9, as can be seen in FIG. 5.
  • the jacks 23a, 23b and 24 are integrated into the central body 20 which comprises a first chamber 28 with a vertical axis in which the piston 24 ′ of the jack 24 is mounted and which is closed by a part 29 screwed into the central body 20 and comprising a seal.
  • the piston rod 24 ′ of the jack 24 is slidably mounted in the vertical direction and sealed inside the part 29.
  • the central body 20 comprises a second chamber 30 with a horizontal axis in which the pistons 22′a and 22′b of the jacks 22a and 22b are slidably mounted and which is closed at its ends by closing pieces 31a and 31b in which are mounted sliding and watertight, respectively, the rod of the jack 22a and the rod of the jack 22b.
  • the cylinders 22a and 22b constitute a double cylinder whose pistons and rods move in opposite directions, when the double cylinder is supplied with hydraulic fluid.
  • the rods of the jacks move either to the right and, in this case, the rod of the jack 22a comes into a retracted position and the rod of the jack 22b in a deployed position, or to the left and, in this case, the cylinder rod 22a comes in a deployed position and cylinder rod 22b in a retracted position.
  • the displacement in opposition of the two cylinders makes it possible to carry out the displacement of the carrier in a circumferential direction of the annular space of the steam generator.
  • the rod of the actuator 24 moves between a high deployed position and a low retracted position.
  • the flexible envelopes 21, 23a and 23b which can be removably attached to the end of the rods of the cylinders 22a, 22b and 24 by means of a dovetail assembly comprise a support allowing an articulated mounting on the rod of the corresponding cylinder .
  • the casing 21 is mounted articulated on the rod of the jack 24, around an axis having a first direction and the casings 23a and 23b are mounted articulated on the rods of the jacks 22a and 22b respectively around an axis having a second direction perpendicular to the first.
  • the first direction is horizontal and the second direction is vertical.
  • Each of the envelopes 21, 23a and 23b is produced in double form and comprises two cylindrical compartments constituting inflatable balloons, thanks to solenoid valves and to a compressed air supply circuit.
  • the arms 25a and 25b constituting the means for guiding the carrier on the lower end of the bundle envelope are constituted by flexible metal blades which are mounted articulated on the body 20 so as to constitute a compass which can be in the open position , as shown in Figure 3, or in the closed position.
  • the arms 25a and 25b are spaced apart and form a certain angle, so that the guide rollers 26a and 26b are spaced apart by a certain distance.
  • the arms 25a and 25b are held in this separated position by a set 33 of two links articulated between them and articulated on the arms 25a and 25b.
  • the flexible envelope 21 is introduced in the retracted state into the annular space 13 of the steam generator, through the fist hole 15.
  • the envelope 21 is placed in a position situated above the fist hole 15 and inflated by compressed air, which ensures its expansion and its fixing in place by wedging in the annular space 13.
  • the central body 20 and the guide means constituted by the arms 25a and 25b are then introduced into the annular space of the steam generator, through the fist hole 15.
  • the arms 25a and 25b are placed in their folded position, which makes it possible to introduce them in the vertical direction through the fist hole using the flexibility of the spring blades constituting these arms.
  • the arms 25a and 25b and the central body 20 of the carrier are engaged in the fist hole by displacement in the vertical direction and downwards.
  • the envelopes 23a and 23b are fixed to the ends of the rods of the jacks 22a and 22b respectively, by means of their support, successively, at the fist hole 15.
  • the connections of the fluid circuits are made between the inflatable envelopes and the body central.
  • the assembly of the central body 20, of the guide device 25 and of the flexible envelopes 23a and 23b is then moved upward, so as to achieve the fixing of the central body 20 on the support of the envelope 21, via of the rod of the jack 24, the opening of the arms 25a and 25b then the blocking in the open position by the rods 33.
  • the jack 24 is actuated so as to exert traction in the vertical direction and upwards on the central body 20 and to put the guide rollers 26a and 26b in abutment on the lower edge 9a of the bundle envelope 9.
  • the envelopes 23a and 23b are then moved simultaneously to the right or to the left depending on the direction of movement desired for the wearer, using the double jack 22a, 22b.
  • the envelopes 23a and 23b are then supplied with compressed air, so as to inflate the envelopes and wedge them in the annular space 13 between the bundle envelope and the external envelope of the steam generator.
  • the flexible envelope 21 is then placed in its retracted position by evacuation of the compressed air which it contained.
  • the double jack 22a, 22b is supplied in the opposite direction to the previous one, which causes the whole carrier to move, either to the right or to the left, in the desired direction of movement, relative to the envelopes 23a and 23b and to the rods of the jacks 22a and 22b which are held in a fixed position relative to the steam generator.
  • the next movement step will be carried out by inflating and wedging the flexible envelope 21, then deflating and moving the envelopes 23a and 23b in the desired direction, inflating these envelopes into their new position and finally moving of the central body 20 by supplying the double jack. Between two steps in advance, it is possible to raise the central body by means of the jack 24 so as to press the rollers 26 at the bottom of the bundle envelope 9.
  • the carrier and therefore the tool or the inspection device fixed on this carrier can be placed in any circumferential position relative to the bundle of tubes of the steam generator.
  • the inspection means or the tool is introduced into the zone occupied by the bundle, through the annular opening 14 between the lower end 9a of the bundle casing 9 and the tube plate 3.
  • the central body 40 carries two jack bodies 41 and 42 by means of articulations and in a V-shaped arrangement, the jack bodies being slightly inclined relative to the horizontal plane and forming an angle between them greater than 120 °.
  • the jacks 41 and 42 which are arranged on either side of the central body 40 comprise rods, respectively 41a and 42a directed outwards and carrying at their end, in an articulated manner, respective supports 43a, 43b of two envelopes flexible 44a and 44b.
  • the supports 43a and 43b are each secured to a guide arm, respectively 45a and 45b carrying at its end a respective roller 46a, 46b intended to guide the carrier on the lower edge 9a of the bundle envelope 9.
  • the central body 40 also carries an inflatable flexible envelope 48, by means of a support 49 which can be removably assembled to the carrier 40.
  • the cylinder bodies 41 and 42 mounted articulated on the central body 40 are held in a raised position by two support parts 51a and 51b articulated on the central body 40 and maintained in the spacing and lifting position by a helical spring 50.
  • the inflatable envelopes 44a, 44b and 48 are similar to the envelopes 21, 23a and 23b which are shown in Figures 3 and 4 and which have been described above.
  • the inflatable flexible envelope 48 is introduced in the retracted and deflated state inside the annular space 13, through the fist hole 15 until it comes into a position slightly above the fist hole, as shown in FIG. 7.
  • the flexible envelope 48 is then expanded by inflation with compressed air, which ensures its wedging in the annular space 13 in the position shown.
  • the central body 40 is then put in place and assembled to the support of the flexible envelope 48, by means of a dovetail assembly means.
  • the flexible envelope 48 is then deflated and the assembly of the flexible envelope 48 and the central body 40 is moved manually, either to the right or to the left, so as to release the fist hole 15 while leaving accessible the lateral part of the central body 40 comprising one of the jack supports 51a or 51b.
  • the flexible envelope 8 is then expanded by inflation with compressed air.
  • the steam generator is introduced into the annular space 13, through the fist hole 15, of an assembly constituted by a jack 41 or 42, by an inflatable envelope 44a or 44b and a guide arm 45a or 45b carrying a roller 46a or 46b.
  • the flexible envelope 44a or 44b is in the retracted state and deflated during this insertion operation.
  • the assembly consisting of the jack, the flexible envelope and the guide arm is then fixed on the central body 40 and the corresponding support 51a or 51b.
  • the newly formed assembly is then moved in the opposite direction to the previous one, after deflating the flexible envelope 48, so as to free the entry from the fist hole 15.
  • the assembly of the second assembly is carried out consisting of a jack, a flexible envelope 44a or 44b and a guide means 45a or 45b.
  • rollers 46a and 46b are then brought into contact with the lower edge 9a of the bundle envelope 9, by actuating simultaneously the cylinders 41 and 42, the flexible envelopes 44a and 44b being in the deflated state. .
  • the support parts 51a and 51b make it possible to raise the cylinder bodies, the envelope supports and the arms 45a and 45b, thanks to the action of the helical spring 50.
  • the displacement of the carrier in the circumferential direction is obtained by placing the flexible envelopes 44a and 44b in their expanded state and the central flexible envelope 48 in the retracted and deflated state.
  • the displacement of the central body 40 can be carried out in one direction or the other, as a function of the jack whose deployment is carried out and of the jack whose retraction is carried out.
  • Expansion is then carried out by inflation of the central flexible envelope 48 and retraction by deflation of the lateral flexible envelopes 44a and 44b.
  • the two jacks 41 and 42 can then be actuated simultaneously in the opposite direction to the previous one, so as to replace them in the initial position to carry out a new displacement step.
  • the carrier is guided by the rollers which are kept in contact with the lower end of the bundle envelope and which move thereon.
  • the central body, the actuating cylinders and the flexible deformable envelopes can have shapes and arrangements different from those which have been described by way of examples.
  • the carrier guide assembly can be produced in a different form.
  • the rolling means of this guide assembly can move not only on the lower end of the bundle envelope but also in abutment on the tube plate.
  • the carrier device according to the invention can be used in the case of any steam generator comprising a bundle surrounded by a bundle envelope arranged coaxially so as to provide an annular space comprised between the bundle envelope and the outer envelope.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • High Energy & Nuclear Physics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Monitoring And Testing Of Nuclear Reactors (AREA)
EP92402542A 1991-10-07 1992-09-16 Beweglicher Träger für Intervention in der Sekundärseite eines Dampferzeugers eines nuklearen Druckwasserreaktors Withdrawn EP0537039A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9112321A FR2682215B1 (fr) 1991-10-07 1991-10-07 Dispositif porteur mobile pour realiser des interventions dans la partie secondaire d'un generateur de vapeur d'un reacteur nucleaire a eau sous pression.
FR9112321 1991-10-07

Publications (1)

Publication Number Publication Date
EP0537039A1 true EP0537039A1 (de) 1993-04-14

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP92402542A Withdrawn EP0537039A1 (de) 1991-10-07 1992-09-16 Beweglicher Träger für Intervention in der Sekundärseite eines Dampferzeugers eines nuklearen Druckwasserreaktors

Country Status (4)

Country Link
US (1) US5303271A (de)
EP (1) EP0537039A1 (de)
CA (1) CA2078471A1 (de)
FR (1) FR2682215B1 (de)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100281932B1 (ko) * 1998-10-10 2001-09-22 양재신 드라이브 실린더 유압장치
US20100325859A1 (en) * 2009-06-26 2010-12-30 Areva Np Inc. Method for Repairing Primary Nozzle Welds

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0084867A1 (de) * 1982-01-25 1983-08-03 Kraftwerk Union Aktiengesellschaft Rohrgassen-Manipulator zum Hochdruck-Abschlämmen von Wärmetauschern
EP0104492A2 (de) * 1982-09-27 1984-04-04 Combustion Engineering, Inc. Fernbedienbare Transporteinrichtung für Wartungs- und Prüfungsausrüstung
FR2552205A1 (fr) * 1983-09-21 1985-03-22 Thome Paul Agencement des structures internes de generateurs de vapeur pour en ameliorer la maintenance
US4661309A (en) * 1984-02-13 1987-04-28 Combustion Engineering, Inc. Equipment transporter for nuclear steam generator

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT336926B (de) * 1972-12-22 1977-06-10 Siemens Ag Inspektions- und reparatureinrichtung fur dampferzeuger
FR2457741A1 (fr) * 1979-05-31 1980-12-26 Framatome Sa Porte-outil mobile pour travail sur une plaque tubulaire
US4590991A (en) * 1984-01-09 1986-05-27 Westinghouse Electric Corp. Flexible stabilizer for degraded heat exchanger tubing
US4788867A (en) * 1986-12-30 1988-12-06 Fairchild Weston Systems, Inc. Differential pressure detector
FR2625936A1 (fr) * 1988-01-14 1989-07-21 Hispano Suiza Sa Procede de mise en place d'un robot porte-outils destine a des interventions en milieu humainement hostile

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0084867A1 (de) * 1982-01-25 1983-08-03 Kraftwerk Union Aktiengesellschaft Rohrgassen-Manipulator zum Hochdruck-Abschlämmen von Wärmetauschern
EP0104492A2 (de) * 1982-09-27 1984-04-04 Combustion Engineering, Inc. Fernbedienbare Transporteinrichtung für Wartungs- und Prüfungsausrüstung
FR2552205A1 (fr) * 1983-09-21 1985-03-22 Thome Paul Agencement des structures internes de generateurs de vapeur pour en ameliorer la maintenance
US4661309A (en) * 1984-02-13 1987-04-28 Combustion Engineering, Inc. Equipment transporter for nuclear steam generator

Also Published As

Publication number Publication date
CA2078471A1 (fr) 1993-12-15
FR2682215A1 (fr) 1993-04-09
FR2682215B1 (fr) 1994-01-07
US5303271A (en) 1994-04-12

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