WO2012129655A9 - Raccordement de tubes de calandre - Google Patents

Raccordement de tubes de calandre Download PDF

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Publication number
WO2012129655A9
WO2012129655A9 PCT/CA2012/000276 CA2012000276W WO2012129655A9 WO 2012129655 A9 WO2012129655 A9 WO 2012129655A9 CA 2012000276 W CA2012000276 W CA 2012000276W WO 2012129655 A9 WO2012129655 A9 WO 2012129655A9
Authority
WO
WIPO (PCT)
Prior art keywords
calandria
replacement
calandria tube
tube
serrations
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.)
Ceased
Application number
PCT/CA2012/000276
Other languages
English (en)
Other versions
WO2012129655A1 (fr
WO2012129655A8 (fr
Inventor
Dave Poff
Jessup Howie
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.)
Atomic Energy of Canada Ltd AECL
Original Assignee
Atomic Energy of Canada Ltd AECL
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 Atomic Energy of Canada Ltd AECL filed Critical Atomic Energy of Canada Ltd AECL
Priority to CA2831608A priority Critical patent/CA2831608C/fr
Publication of WO2012129655A1 publication Critical patent/WO2012129655A1/fr
Publication of WO2012129655A8 publication Critical patent/WO2012129655A8/fr
Publication of WO2012129655A9 publication Critical patent/WO2012129655A9/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
    • B23P11/00—Connecting or disconnecting metal parts or objects by metal-working techniques not otherwise provided for 
    • B23P11/005—Connecting or disconnecting metal parts or objects by metal-working techniques not otherwise provided for  by expanding or crimping
    • G—PHYSICS
    • G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
    • G21C—NUCLEAR REACTORS
    • G21C3/00—Reactor fuel elements and their assemblies; Selection of substances for use as reactor fuel elements
    • G21C3/30—Assemblies of a number of fuel elements in the form of a rigid unit
    • G21C3/32—Bundles of parallel pin-, rod-, or tube-shaped fuel elements
    • G21C3/334—Assembling, maintenance or repair of the bundles
    • G—PHYSICS
    • G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
    • G21C—NUCLEAR REACTORS
    • G21C1/00—Reactor types
    • G21C1/04—Thermal reactors ; Epithermal reactors
    • G21C1/06—Heterogeneous reactors, i.e. in which fuel and moderator are separated
    • G21C1/14—Heterogeneous reactors, i.e. in which fuel and moderator are separated moderator being substantially not pressurised, e.g. swimming-pool reactor
    • G21C1/16—Heterogeneous reactors, i.e. in which fuel and moderator are separated moderator being substantially not pressurised, e.g. swimming-pool reactor moderator and coolant being different or separated, e.g. sodium-graphite reactor, sodium-heavy water reactor or organic coolant-heavy water reactor
    • G21C1/18—Heterogeneous reactors, i.e. in which fuel and moderator are separated moderator being substantially not pressurised, e.g. swimming-pool reactor moderator and coolant being different or separated, e.g. sodium-graphite reactor, sodium-heavy water reactor or organic coolant-heavy water reactor coolant being pressurised
    • G21C1/20—Heterogeneous reactors, i.e. in which fuel and moderator are separated moderator being substantially not pressurised, e.g. swimming-pool reactor moderator and coolant being different or separated, e.g. sodium-graphite reactor, sodium-heavy water reactor or organic coolant-heavy water reactor coolant being pressurised moderator being liquid, e.g. pressure-tube reactor
    • 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
    • Y02E30/30—Nuclear fission reactors

Definitions

  • the present invention relates to a method of refurbishing calandria vessels in nuclear reactors, and more specifically, to a method of fastening calandria tubes to the calandria tubesheet plate when refurbishing a nuclear reactor.
  • one of the major components of a nuclear reactor is a calandria - a large, sealed tank, in which the nuclear reaction takes place.
  • the calandria is penetrated by many tubes (i.e. calandria tubes) allowing uranium or similar fuel bundles to be inserted into the calandria via fuel channels, and allowing pressure tubes to draw heat to feed the generation system.
  • a fuel channel consists of a 104 mm diameter, 4.3 mm thick Zirconium alloy pressure tube, inserted into a calandria tube of a slightly larger diameter, with two stainless steel end fittings at the ends of the fuel channel.
  • the calandria tubes penetrate the walls of the calandria through the "tube sheets” or “tubesheet plates” at both ends of the calandria. It is necessary that the seal between the tubesheet plates and the calandria tubes be maintained, to prevent the moderator from leaking into the annulus space between the pressure tube and calandria tube which would
  • each hole (or bore) in the tubesheet plate through which the calandria tubes are fed is machined with grooves as shown in Figure 3.
  • the calandria tubes are "rolled" with a die or mandrel, to expand the end of the calandria tubes into the grooves in the tubesheet plate as shown in Figures 4 and 5. While this provides an effective joint during initial fabrication, it is very difficult to refurbish such joints. Periodically, there is a need to refurbish the calandria and other components of the nuclear reactor, to ensure its safe and efficient operation.
  • a method of refurbishing a calandria comprising the steps of: forming circumferential cuts/serrations on the outside diameter of a calandria tube; and expanding/deforming the calandria tube into a bore of a tubesheet plate of the calandria, whereby the sharp edges of the serrations "bite" into the tubesheet plate.
  • Figure 1 presents a schematic diagram of a nuclear reactor as known in the art
  • Figure 2 presents a simplified diagram of a calandria and immediately related components as known in the art
  • Figure 3 presents details of the interface between a grooved tubesheet plate and a calandria tube as known in the art, prior to rolling;
  • Figures 4, 5 and 6 present details of the interface between a grooved tubesheet plate and a calandria tube as known in the art, following rolling;
  • Figures 7 and 8 present details of the interface between a used tubesheet plate and a new serrated calandria tube in an embodiment of the invention.
  • Figures 9 and 10 present details of the serrations that may be made to a calandria tube in an embodiment of the invention.
  • An acceptable replacement calandria tube joint can be made by purposefully machining circumferential serrated grooves in the leading edge, outside diameter of the calandria tube. These serrated grooves with sharp edges will "bite” into the tubesheet plate during rolling and effectively make a new metal-to-metal seal between the new calandria tube and the used tubesheet plate.
  • the outer surface of calandria tubes are smooth. The use of serrated outer surfaces creates multiple knife edges on the outside diameter of the calandria tube which, when mechanically rolled "bite” into the tubesheet material, thereby creating a leak-tight and strong joint.
  • the calandria tubes are a Zirconium alloy, which is harder than the irradiated 304L stainless steel tubesheet bore, hence the calandria tubes will cut into the tubesheet bores.
  • a number of these grooves in series (3 to 5 for example) will provide numerous seals, providing a very tight replacement calandria tube joint seal.
  • CANDU reactors are typically fabricated with grooves in the tubesheet bores, and the calandria tubes are rolled into the tubesheet bores. However, when re-tubing the reactor, the tubesheet grooves become damaged and therefore cannot typically produce a good, leak-tight joint.
  • the system of the invention uses new calandria tubes which (of course) are not radioactive, so the grooves or serrations can be cut into the new calandria tubes in a normal workshop environment, outside the nuclear vault.
  • the aforementioned bore re-dressing is not required, and there is no radioactive debris produced.
  • the properties of the calandria materials are as follows. Of course, the materials could change dramatically from one reactor design to the next:
  • the tubesheet plate is 304L stainless steel, (rolled in section is 1.5" long), ii) the calandria tube is a Zirconium alloy, and
  • the rolled insert is 410 stainless steel.
  • the rolled insert has a lower yield strength than the tubesheet plate; thus, the rolled insert plastically yields before the 304 SS yields, providing a resistive force against the springback of the tubesheet plate and forming a tight seal. Also, the calandria tube is the hardest component of the three, providing the hardness needed to bite into the tubesheet plate.
  • the serrations, grooves, edges and cuts in the calandria tubes may be prepared in various ways, using various cutting and deforming tools including lathes, rollers and dedicated hand tools. As well, the depth, spacing, angle and number of serrations required will change from one implementation of the invention to the next. These parameters will depend on the nature of the materials and the degree of seal / mechanical pullout strength required.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Plasma & Fusion (AREA)
  • General Engineering & Computer Science (AREA)
  • High Energy & Nuclear Physics (AREA)
  • Mechanical Engineering (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
  • Joints With Sleeves (AREA)

Abstract

La présente invention porte sur un procédé de remise en état de calandres dans les réacteurs nucléaires et elle porte plus précisément sur un procédé pour fixer des tubes de calandre à une tôle de plaque tubulaire dans une calandre lors de la remise en état d'un réacteur nucléaire. Un procédé de remise en état d'une calandre selon l'invention comprend les étapes de : formation d'entailles, dents ou gorges circonférentielles sur le diamètre extérieur d'un tube de calandre; et dilatation/déformation du tube de calandre dans un perçage d'une tôle de plaque tubulaire de la calandre, de sorte que les arêtes vives des dents « mordent » dans la tôle de la plaque tubulaire pour établir un raccordement étanche aux fuites. D'autres aspects de l'invention sont aussi décrits.
PCT/CA2012/000276 2011-03-29 2012-03-29 Raccordement de tubes de calandre Ceased WO2012129655A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CA2831608A CA2831608C (fr) 2011-03-29 2012-03-29 Raccordement de tubes de calandre

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CA2,735,109 2011-03-29
CA2735109A CA2735109A1 (fr) 2011-03-29 2011-03-29 Joint pour tubes de calandre

Publications (3)

Publication Number Publication Date
WO2012129655A1 WO2012129655A1 (fr) 2012-10-04
WO2012129655A8 WO2012129655A8 (fr) 2012-11-29
WO2012129655A9 true WO2012129655A9 (fr) 2013-03-21

Family

ID=46889546

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CA2012/000276 Ceased WO2012129655A1 (fr) 2011-03-29 2012-03-29 Raccordement de tubes de calandre

Country Status (2)

Country Link
CA (2) CA2735109A1 (fr)
WO (1) WO2012129655A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RO133588B1 (ro) * 2017-06-23 2024-03-29 Candu Energy Inc. Aparat şi metodă pentru localizarea unui tub calandria
RO134273B1 (ro) * 2017-06-23 2025-02-28 Candu Energy Inc. Dispozitiv şi metodă pentru îndepărtarea unei inserţii de tub calandria

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3584903A (en) * 1968-04-29 1971-06-15 Ca Atomic Energy Ltd Rolled channel joints
US5640434A (en) * 1995-07-31 1997-06-17 Rottenberg; Sigmunt Miniaturized nuclear reactor utilizing improved pressure tube structural members
US6599067B2 (en) * 2001-03-26 2003-07-29 Atomic Energy Of Canada Limited Apparatus for removing pressure tubes

Also Published As

Publication number Publication date
CA2831608C (fr) 2020-08-04
CA2735109A1 (fr) 2012-09-29
WO2012129655A1 (fr) 2012-10-04
CA2831608A1 (fr) 2012-10-04
WO2012129655A8 (fr) 2012-11-29

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