USRE32832E - Temporary obturation panel of a passage inside a vessel accessible only through an orifice of smaller size - Google Patents

Temporary obturation panel of a passage inside a vessel accessible only through an orifice of smaller size Download PDF

Info

Publication number
USRE32832E
USRE32832E US07/037,903 US3790387A USRE32832E US RE32832 E USRE32832 E US RE32832E US 3790387 A US3790387 A US 3790387A US RE32832 E USRE32832 E US RE32832E
Authority
US
United States
Prior art keywords
panels
panel
passage
obturation
support collar
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
US07/037,903
Other languages
English (en)
Inventor
Jean Coussau
Claude Lavaleric
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
Application granted granted Critical
Publication of USRE32832E publication Critical patent/USRE32832E/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Images

Classifications

    • G—PHYSICS
    • G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
    • G21D—NUCLEAR POWER PLANT
    • G21D1/00—Details of nuclear power plant
    • G21D1/02—Arrangements of auxiliary equipment
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J13/00—Covers or similar closure members for pressure vessels in general
    • F16J13/02—Detachable closure members; Means for tightening closures
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L55/00—Devices or appurtenances for use in, or in connection with, pipes or pipe systems
    • F16L55/10—Means for stopping flow from or in pipes or hoses
    • 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
    • F22B37/02—Component parts or details of steam boilers applicable to more than one kind or type of steam boiler
    • F22B37/22—Drums; Headers; Accessories therefor
    • F22B37/221—Covers for drums, collectors, manholes or the like
    • F22B37/222—Nozzle dams introduced through a smaller manway, e.g. foldable
    • 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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E30/00—Energy generation of nuclear origin

Definitions

  • the present invention relates to a panel for the temporary fluid-tight obturation of a passage inside a vessel accessible only through an orifice of dimensions less than those of the passage to be closed.
  • the invention finds a particularly effective use for the temporary closure of the junction aperture on the water box of a steam generator, of a duct of the primary circuit of a pressurized water nuclear reactor.
  • the pressurized water of the primary circuit flows between the reactor proper where, in contact with fuel elements it absorbs the heat resulting from the nuclear reactions, and a steam generator where this heat is used to produce the steam then directed to the turbo-alternator units if the reactor is used in a nuclear electricity generating station.
  • the steam generator is generally constituted by a bundle of U-tubes mounted on a tube plate with a hemispherical water box divided into two by a partition separating two chambers; the water coming from the tank of the reactor enters one of the chambers, traverses the U tubes and is collected in the other chamber whence it is pumped to be sent to the reactor.
  • the junction apertures of the primary circuit on the chambers of the water box are of relatively large size, of the order, for example, of a meter in diameter.
  • French patent no. 76-03456 of Applicant, describes an embodiment of such an obturation panel enabling both its introduction into elements separated by the small cross-section access manhole, its rapid positioning on a support collar surrounding the aperture, and its rapid fixing by screwing to the support collar.
  • Such a device is however only capable of supporting hydrostatic pressures slightly higher than one bar, corresponding to the water height of the pool of the reactor.
  • the obturators of the apertures of the primary circuit are then intended to isolate the generator which is at an overpressure of about 3.8 bars on the water box side surface.
  • the invention therefore applies to a temporary fluid-tight obturation panel of a passage inside an enclosure accessible only through an aperture of dimensions less than those of the passage to obturated, the periphery of the passage to be obturated including a support collar provided with threaded bores.
  • the panel is constituted by:
  • each panel hinged to one another by flexible fluid-tight hinges, the size and the number of the panels being determined to permit the passage through the access aperture of the set of panels folded on one another, each panel comprising along its articulated edges a series of latching pins.
  • each stiffener comprising two lines of holes conjugate with the lines of latching pins of two contiguous panels
  • a frame in at least two parts articulated and foldable on one another, reproducing in unfolded position the contour of the support collar and comprising means to grip, with the interposition of a seal, the ends of the panels and stiffeners against the support collar, by screwing into the threaded bores.
  • the panels are constituted of light metal alloy coated with carbon fiber bonded with resin, and the flexible hinges are formed of a corrosion-resistant elastomer.
  • FIG. 1 is a limited view from above, with partial sections of an obturator in position on the support collar of the aperture.
  • FIG. 2 is a section along the line II--II of FIG. 1.
  • FIG. 3 shows on a larger scale the detail of the assembly of a stiffener on the obturator, along the line III--III of FIG. 1.
  • FIG. 4 shows the detail of the fastening of the end of a stiffener and of a panel on the support collar, along the line IV--IV of FIG. 1.
  • FIG. 5 shows the articulation of the fastening frame along the line V--V of FIG. 1.
  • FIG. 6 shows the panels in folded position for their passage through the aperture for access to the vessel.
  • the obturator proper is here formed of three panels 5, 6 and 7, each constituted by a honeycomb structure 9 of light metal, itself coated with a layer 10 of composite materials of carbon fibers bounded by a resin.
  • the panels are joined together by a strip 11 of elastomer overmolded onto the parallel edges of the panels opposite each other, as can be seen better in FIG. 3 on a larger scale.
  • the strips 11 thus form a flexible but sealing hinge between the panels 5 and 6 on the one hand and 6 and 7 on the other hand.
  • the mechanical strength of the hinges is reinfored, on each surface of the panels, by strips 12 forming butt-plates, themselves of carbon fiber-resin composite material, and fixed to the panels by screws 13 and nuts 14.
  • the head of the screws 13 is extended by latching pins 15 of mushroom shape projecting at regular intervals in line along the articulated edges of the panel.
  • Each panel 5, 6, 7 is calculated and dimensioned to be able, in itself, to withstand the operational or test pressures.
  • the device comprises separate stiffening girders 17, designed to be positioned on the hinges.
  • the girders 17 are constituted by two webs of stainless steel 18 welded to two sill plates 19 and 20.
  • the sill plate 19 is cut out to form openings in the form of hooks 21 which, by a slight longitudinal movement, come into gripping relationship beneath the heads of the latching pins 15, so as to lock in the same flat alignment the two edges of the two contiguous panels and so as to carry back onto the girder unit 17 the forces which would tend to cause the articulation 11 to fold.
  • the set of devices is completed by a crown 22, here circular, constituted of two portions articulated along a diametric axis 23 (FIG. 5), so as to permit each half-crown to fold back onto the other along the arrow 24.
  • Procedure will be as follows for the positioning of the obturator on the support collar 2 of the aperture to be closed.
  • the constituent elements of the obturator are first introduced inside the chamber of the water box through the manhole of small diameter 26 (FIG. 6).
  • the rectilinear girders 17 are introduced as such, while the crown 22 is introduced without difficulty once folded on itself into a half ring of small cross-section.
  • the three articulated panels are also folded back on one another around the flexible hinges 11, and it is seen in FIG. 6 that their assembly then presents a sufficiently reduced bulk to pass through the manhole 26 without difficulty.
  • the crown 22 After unfolding the crown 22 can then be placed in position to grip the edges of the panels against the girder 2 by means of screws 29 engaged in the threaded holes 4. The fluid-tightness of the assembly is ensured, after final tightening of the screws 29, by seals 30 arranged at the periphery of the group of panels
  • the girders 17 will be berthed in the axis of the hinges 11, in a positin where the pins 15 are freed from the hooks 21. This is possible by means of the discontinuity of the extension 31 of the sill plate 19, which forms a longitudinal play 32 at each end of the girder 17.
  • the shaped sectional element of elastomer 34 will have been folded back against the strip 11 which shaped element is intended to provide a supporting collar on the hinge strip 11.
  • the shaped element 34 was held spaced by links 35 buttoned to fasteners 36.
  • FIG. 6 and in the left portion of FIGS. 1 and 2 are seen the shaped elements 34 in waiting position; in FIG. 3 and in the right-hand portion of FIG. 1 are seen on the other hand, the shaped elements 34 in supporting position of the flexible hinge 11.
  • the invention is not strictly limited to the embodiment which has been described by way of example, byt it also covers constructions which only differ therefrom in detail, in modifications of execution or in the use of equivalent means.
  • it must not be limited to the obturation of circular apertures, since it applies in the same way to the obturation of passages of any shape, and for example rectangular, whenever obturation must be formed within a vessel accessible only through an aperture of dimensions less than those of the passage to be obturated.
  • the number and size of the panels will then be determined so as to be able to introduce the folded assembly through the access aperture and of course as many stiffening girders as articulations will then be provided.
  • the clamping frame could also include several articulations, enabling it to be folded sufficiently to permit its passage through the access aperture.
  • the support elements 34 could, as a modification, be bonded permanently beneath the sill plate 19 of the stiffening girders 17.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Plasma & Fusion (AREA)
  • High Energy & Nuclear Physics (AREA)
  • Pressure Vessels And Lids Thereof (AREA)
  • Structure Of Emergency Protection For Nuclear Reactors (AREA)
  • Hinges (AREA)
  • Tents Or Canopies (AREA)
US07/037,903 1983-11-02 1987-04-13 Temporary obturation panel of a passage inside a vessel accessible only through an orifice of smaller size Expired - Fee Related USRE32832E (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8317391 1983-11-02
FR8317391A FR2554208B1 (fr) 1983-11-02 1983-11-02 Panneau d'obturation provisoire d'un passage a l'interieur d'une enceinte accessible seulement par un orifice de plus petites dimensions

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
US06/667,192 Reissue US4600115A (en) 1984-11-01 1984-11-01 Temporary obturation panel of a passage inside a vessel accessible only through an orifice of smaller size

Publications (1)

Publication Number Publication Date
USRE32832E true USRE32832E (en) 1989-01-17

Family

ID=9293703

Family Applications (1)

Application Number Title Priority Date Filing Date
US07/037,903 Expired - Fee Related USRE32832E (en) 1983-11-02 1987-04-13 Temporary obturation panel of a passage inside a vessel accessible only through an orifice of smaller size

Country Status (10)

Country Link
US (1) USRE32832E (ko)
EP (1) EP0141738B1 (ko)
JP (1) JPS60138304A (ko)
KR (1) KR910000921B1 (ko)
CA (1) CA1239844A (ko)
DE (1) DE3462826D1 (ko)
ES (1) ES282372Y (ko)
FR (1) FR2554208B1 (ko)
YU (1) YU185184A (ko)
ZA (1) ZA848529B (ko)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10014309C1 (de) * 2000-03-23 2001-07-19 Siemens Ag Verfahren und Vorrichtung zum zeitweiligen Verschließen eines Rohres

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2585101B1 (fr) * 1985-07-16 1987-11-27 Framatome Sa Obturateur amovible pour orifice accessible seulement par un passage etroit
EP0213024B1 (fr) * 1985-08-09 1989-07-12 Framatome Dispositif de mise en place et de maintien d'une plaque d'obturation d'un orifice dans une enceinte
FR2595668B1 (fr) * 1986-03-17 1988-06-03 Bertin & Cie Dispositif d'obturation d'un orifice a l'interieur d'une enceinte accessible seulement par un autre orifice de dimensions inferieures a celles de l'orifice a obturer
US4850600A (en) * 1987-11-05 1989-07-25 Siemens Aktiengesellschaft Sealing device for pipe connectors discharging into a vessel, in particular a steam generator

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3926722A (en) * 1973-06-29 1975-12-16 Combustion Eng Reactor vessel head support arrangement
US3963565A (en) * 1973-02-13 1976-06-15 Siempelkamp Giesserei Kg Holddown arrangement for removable cover of a pressurized nuclear-reactor core and method of using same

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2340489A1 (fr) * 1976-02-09 1977-09-02 Framatome Sa Dispositif d'obturation d'un orifice
FR2415515A1 (fr) * 1978-01-30 1979-08-24 Framatome Sa Dispositif de vissage a commande a distance

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3963565A (en) * 1973-02-13 1976-06-15 Siempelkamp Giesserei Kg Holddown arrangement for removable cover of a pressurized nuclear-reactor core and method of using same
US3926722A (en) * 1973-06-29 1975-12-16 Combustion Eng Reactor vessel head support arrangement

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10014309C1 (de) * 2000-03-23 2001-07-19 Siemens Ag Verfahren und Vorrichtung zum zeitweiligen Verschließen eines Rohres

Also Published As

Publication number Publication date
ZA848529B (en) 1985-06-26
FR2554208B1 (fr) 1986-01-17
EP0141738A1 (fr) 1985-05-15
FR2554208A1 (fr) 1985-05-03
ES282372Y (es) 1985-12-16
JPS60138304A (ja) 1985-07-23
KR850003814A (ko) 1985-06-26
ES282372U (es) 1985-05-01
KR910000921B1 (ko) 1991-02-18
CA1239844A (en) 1988-08-02
YU185184A (en) 1988-08-31
DE3462826D1 (en) 1987-05-07
EP0141738B1 (fr) 1987-03-25

Similar Documents

Publication Publication Date Title
US4600115A (en) Temporary obturation panel of a passage inside a vessel accessible only through an orifice of smaller size
USRE32832E (en) Temporary obturation panel of a passage inside a vessel accessible only through an orifice of smaller size
US5272732A (en) Reactor cavity seal joint
US5489124A (en) Safety shield
US4200061A (en) Steam generator for nuclear power plants, especially for pressurized water reactors
KR890000667B1 (ko) 원자력발전소 가압기용 밸브지지장치
CA1253409A (en) Device for the installation and retention of a shutter plate for an opening in an enclosure
US5238054A (en) Steam generator nozzle dam
US5167905A (en) Foldable nozzle dam having a foldable extrusion-resistant seal or gasket
US4078966A (en) System for the emergency injection of liquid into a nuclear reactor core
US3831673A (en) Heat exchangers
DE3044902A1 (de) Waermeaustauscher
US4782863A (en) Removable shutter for an orifice accessible only through a narrow passage
US4607852A (en) Accordian-folded boot shield for flexible swivel connection
JPS63282493A (ja) 二重伝熱管型熱交換器
Samavedam et al. Test Facility for Evaluation of Structural Integrity of Stiffened & Jointed Aircraft Curved Panels
US3370741A (en) Manhole cover and mounting means therefor
US5481928A (en) Modular wall member of an enclosure for covering a receptacle and in particular the vessel head of a nuclear rector
GENERATOR COMBUSTION DIVISION
JPS5936236B2 (ja) 鋼製格納容器
JPS61272597A (ja) 熱交換器
SU1677591A1 (ru) Устройство дл испытани патрубка
JPH0436233B2 (ko)
SU367225A1 (ru) Разборный гидробасср.йн
Andrieu et al. Report of a consultants meeting on the review of Bubbler condenser structural integrity calculations

Legal Events

Date Code Title Description
LAPS Lapse for failure to pay maintenance fees
STCH Information on status: patent discontinuation

Free format text: PATENT EXPIRED DUE TO NONPAYMENT OF MAINTENANCE FEES UNDER 37 CFR 1.362

FEPP Fee payment procedure

Free format text: PAYOR NUMBER ASSIGNED (ORIGINAL EVENT CODE: ASPN); ENTITY STATUS OF PATENT OWNER: LARGE ENTITY