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EP0173602B1 - Notwärmetauscher zur Kühlung des Primärmittels eines Kernreaktors und Verfahren zu dessen Zusammenbau - Google Patents

Notwärmetauscher zur Kühlung des Primärmittels eines Kernreaktors und Verfahren zu dessen Zusammenbau Download PDF

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Publication number
EP0173602B1
EP0173602B1 EP85401459A EP85401459A EP0173602B1 EP 0173602 B1 EP0173602 B1 EP 0173602B1 EP 85401459 A EP85401459 A EP 85401459A EP 85401459 A EP85401459 A EP 85401459A EP 0173602 B1 EP0173602 B1 EP 0173602B1
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EP
European Patent Office
Prior art keywords
tubes
heat exchanger
bundle
tube
shell
Prior art date
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Expired
Application number
EP85401459A
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English (en)
French (fr)
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EP0173602A1 (de
Inventor
Luis Fernandez
Gérard Stalport
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.)
Framatome Te Courbevoie Frankrijk
Original Assignee
Novatome SA
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Priority to AT85401459T priority Critical patent/ATE30077T1/de
Publication of EP0173602A1 publication Critical patent/EP0173602A1/de
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Publication of EP0173602B1 publication Critical patent/EP0173602B1/de
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D7/00—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
    • F28D7/005—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits for only one medium being tubes having bent portions or being assembled from bent tubes or being tubes having a toroidal configuration
    • 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
    • F28F9/007—Auxiliary supports for elements
    • F28F9/013—Auxiliary supports for elements for tubes or tube-assemblies
    • F28F9/0133—Auxiliary supports for elements for tubes or tube-assemblies formed by concentric strips
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D21/00—Heat-exchange apparatus not covered by any of the groups F28D1/00 - F28D20/00
    • F28D2021/0019—Other heat exchangers for particular applications; Heat exchange systems not otherwise provided for
    • F28D2021/0054—Other heat exchangers for particular applications; Heat exchange systems not otherwise provided for for nuclear applications

Definitions

  • the invention relates to an emergency heat exchanger for cooling the primary fluid of a nuclear reactor, the core of which consists of fuel assemblies releasing heat is immersed in a primary fluid contained in a tank.
  • the primary coolant for the reactor is generally constituted by liquid sodium filling a large stainless steel tank closed by a very thick horizontal slab.
  • the main heat exchange circuit of the reactor is generally used to cool it after shutdown.
  • This circuit includes, in the case of integrated type reactors, sodium-sodium intermediate exchangers and pumps to circulate the primary sodium. These pumps operate at low speed during cool down after shutdown.
  • Such an emergency circuit includes a sodium-sodium heat exchanger partly immersed in the primary fluid of the reactor.
  • This heat exchanger comprises a bundle of tubes inside which circulates secondary sodium which heats up in contact with the primary sodium contained in the reactor vessel.
  • the secondary sodium circulated in the bundle is itself cooled outside the reactor vessel, in a sodium-air exchanger.
  • the sodium-sodium emergency exchangers as described for example in EP-A-0 083 545 are most of the time of the type with pin tube bundles dipping directly into the primary sodium. These tubes are placed inside an external ferrule open at its base and pierced over a large part of its lateral surface.
  • the U-shaped tubes are connected at one end to a first tubular plate of annular shape and at their other end to a second tubular plate of circular shape offset from the first according to the height of the heat exchanger.
  • the first tubular plate of annular shape is located peripheral to the second tubular plate.
  • the cooled sodium descends into the branches of the tubes located at the central part of the exchanger and rises through the branches of the tubes situated at the periphery of the latter. As it travels through the tubes, the secondary liquid sodium heats up in thermal contact with the primary sodium through the wall of the tubes. This results in very significant temperature differences between the different parts of the exchanger. It can also experience significant temperature variations over time. This results in thermal stresses which can be very high in certain parts of the exchanger and it is necessary to design exchangers of a structure such that it makes it possible to reduce these thermal stresses to acceptable levels.
  • the tubes constituting the exchange bundle must be effectively braced, to avoid their relative displacement under. the action of heat and under the action of vibrations. This results in problems which are difficult to solve for the mounting of the heat exchanger.
  • the object of the invention is therefore to propose an emergency heat exchanger for cooling the primary fluid of a nuclear reactor contained in a tank comprising a substantially horizontal closing plate and enclosing the core of the reactor immersed in the primary fluid, comprising a support flange intended to rest on the closure plate, a bundle of exchange tubes folded in a pin and fixed on two tubular plates, the first of these plates being of annular shape and situated peripherally with respect to the second central plate, of circular shape, a cylindrical ferrule with vertical axis enveloping the bundle which is immersed in the primary fluid and a circuit for supplying the tubes of the bundle with heat exchange fluid comprising a means for cooling the heated exchange fluid by the primary fluid placed outside the tank, a heat exchanger which makes it possible to limit the thermal constraints in its various constituent elements and which is of a simple structure and allows easy assembly.
  • the two tubular plates are placed coaxially horizontally and at the same level, the tubular plate of annular shape being fixed on its periphery to a first ferrule with vertical axis situated above the tubular plates and connecting the latter to the support flange and along its internal edge to a second ferrule coaxial with the first, located below the tubular plates and carrying a connecting piece connecting it to a third ferrule connected to the central tubular plate, and each of the tubes of the bundle successively comprises a straight vertical part connected to the central tubular plate, a bent part for inverting the tube, a straight vertical return part, a horizontal circular portion about one third of the circumference and a vertical part connecting to the plate tubular peripheral.
  • the invention also relates to a method for mounting the heat exchanger.
  • insulated conduits 7 and 8 respectively ensuring the return of the cooled secondary sodium in the heat exchanger and the removal of the heated secondary sodium which is sent, for its cooling, in an exchanger sodium-air heat disposed outside the tank, not shown, and located on the secondary sodium circuit.
  • the lower part 1b of the exchanger consists of a ferrule with a vertical axis comprising holes and enveloping the exchange bundle.
  • the upper part 1a of the heat exchanger comprises an external envelope on which are fixed the sodium conduits 7 and 8 in communication inside the envelope of the heat exchanger with a chamber 10 of arrival of the secondary liquid sodium and with a chamber 11 for the return of the heated secondary sodium, respectively.
  • the secondary liquid sodium inlet and return chambers 10 and 11 are coaxial and have the vertical axis ZZ 'of the heat exchanger as a common axis.
  • the secondary sodium inlet chamber 10 is arranged at the central part and has a double wall.
  • the chamber 11 for the return of the heated secondary sodium is arranged at the periphery of the chamber 10.
  • the chambers 10 and 11 are constituted by cylindrical ferrules and frustoconical ferrules welded end to end.
  • the volume between the two walls of the chamber 10 is filled with an inert gas.
  • the volume between the external wall of the cylindrical part of the chamber 11 and the external envelope of the heat exchanger is filled with heat-insulating blocks 12. Heat-insulating is also arranged in the extension of these blocks 12 around the conduits 7 and 8.
  • a ferrule 15 of greater thickness constituting the external wall of the heat exchanger connecting the flange 5 to the lower part 1 of the exchanger.
  • the bundle 17 consisting of a set of tubes bent into a pin which each have one end connected to an external tubular plate of shape annular 18 and one end connected to a central tubular plate of circular shape 19.
  • the two tubular plates 18 and 19 both have the axis ZZ ′ of the heat exchanger as an axis and are placed opposite one another in this heat exchanger, the annular plate 18 surrounding the circular plate 19.
  • the tubular plate 18 is connected on its periphery to the shell 15 of the heat exchanger which thus ensures the connection between the tubular plate 18 and the flange 5.
  • the annular plate 18 On its internal edge, the annular plate 18 is connected to one of the walls of the secondary sodium inlet chamber 10.
  • the central plate 19 is connected to the second envelope of the chamber 10.
  • the envelope of the chamber 11 is connected to the shell 15 at its lower part by means of a Y-piece 21.
  • the shell 15 is extended below the tubular plates 18 and 19 by the shell 1b enveloping the bundle of tubes of the heat exchanger.
  • This ferrule 1 is fixed by welding along the outer edge of the annular plate 18, below this plate.
  • a ferrule 20 of short length is fixed along the inner edge of the plate 18, on its underside.
  • the lower part of this ferrule 20 is connected to an annular junction piece with Y-shaped section 22 which makes it possible to connect the ferrule 20 to a ferrule 23 of a substantially identical length coaxial with the ferrule 20 and fixed along the edge of the central plate 19 on its lower face re.
  • tie rods 25 At the lower part of the annular part 22 with a Y section are fixed tie rods 25 whose circumferential distribution is visible in FIGS. 3a and 3b. These tie rods 25 maintain, by means of short sleeves 26, a set of spacer grids 27 ensuring the transverse maintenance of the tubes 28 of the bundle 17.
  • Each of the tubes 28 of the bundle comprises a straight descending part 28a fixed at its upper end in the tubular plate 19, a bent part for turning the tube 28b, a straight return part 28c, a horizontal circular portion 28e visible in FIG. 3a and finally a terminal straight part 28f fixed inside the tubular plate 18.
  • the inlet end communicates with the sodium inlet chamber 10 and the outlet end with the return chamber 11 of the liquid sodium.
  • the lower part of the heat exchanger up to the level of liquid sodium 2 being immersed in the primary sodium to be cooled, the secondary sodium circulating in the tubes 28 heats up before leaving in the chamber 11.
  • the different parts of the tubes and the heat exchanger are therefore at different temperatures.
  • the primary sodium is in contact with the bundle over its entire submerged length and perforations 30 are provided for the passage of the primary sodium in the envelope 1b.
  • the upper part of the portions 28a of the tubes, the circular portions 28e in their entirety and the portions 28f are arranged above the level 2 of the primary liquid sodium.
  • the two tubular plates 18 and 19 comprise means for joining them as well as to the support flange 5 of the exchanger which make it possible to absorb any deformation of the bundle and of the rings of the exchanger. At the same time, these joining means allow effective maintenance of the tubular plates and of the external ferrule 1b of the bundle. In addition, the transverse retention of the beam against vibrations is ensured by the spacers 27 fixed to the lower part of the annular junction piece 22.
  • the base of the bundle formed by the bent portions 28b visible in FIGS. 2b and 3c is constituted by a simple juxtaposition of hairpin tubes having good resistance to deformation in the transverse directions.
  • FIG 4 we see an embodiment of a spacer grid 27 for fixing the tubes 28.
  • This spacer grid 27 is constituted by a set of circular and concentric hoops 34 all having as axis the axis ZZ 'of the heat exchanger, between which are arranged metal strips 32 with sinusoidal folding fixed on each side on the corresponding ribs.
  • the hoops 34 are constituted by successive portions connected by welded junction pieces 35.
  • the bands 32 folded in the form of sinusoids provide the junction between the different hoops and constitute with them three external retaining rings 36a, 36b and 36c and six rings internal 37.
  • the tie rods 25 ensure the suspension of the spacer grid 27 under the tubular plates.
  • FIGS. 5, 6 and 7 a second embodiment of a spacer grid is seen, the latter comprising a set of concentric rings 40 all having as axis the axis ZZ 'of the heat exchanger as previously.
  • These cerces 40 comprise rectangular cutouts 41 as visible in FIG. 6 and the framework of the grid is constituted, in addition to the hoops 40, by radial elements 42 and a strip 43 folded so as to provide a housing for the tubes 28 between the strip 43 and the corresponding hoop 40.
  • the strip 43 is bent at right angles to form a part of dimensions corresponding to the cutouts 41 of the hoop 40.
  • These portions 44 folded to right angles are introduced into the cutouts 41 of the hoop 40 and held in place by pieces 45 playing the role of stirrup.
  • These parts 45 have the form of portions of rings cut into slots as visible in FIG. 7 or of combs.
  • the concentric rings 40, the radial elements 42 and the strip 43 constituting the framework of the grid 27 are connected together to ensure the cohesion of the structure.
  • the radial elements 42 also carry the sleeves 26 for fixing the tie rods 25 for hanging the grid 27.
  • the interior parts of the spacer grids suspended by the tie rods 25 are placed under the tubular plates 18 and 19, then the branches 28a of the tubes 28 are introduced into the spacer grids one by one so as to constitute a first complete outer layer.
  • the ends of the tubes 28 are then connected to the tubular plates 18 and 19 respectively and the external hoops are put in place so as to constitute a first external ring for fixing the tubes 28.
  • the fixing elements such as 32 (FIG. 4) or such that 43 and 45 ( Figure 5) are connected to the or the hoops set up in the outer part of the grid.
  • the two following layers are formed successively, in the same way.
  • the outer shroud 1b is placed enveloping the bundle, then this shroud 1b is fixed by welding to the tubular plate 18.
  • the tubes 28 are first put in place against the hoops 40, then the fixing pieces 43 are introduced into the cutouts 41 of the hoops 40. Finally, the whole is immobilized by the parts 45 in the form of a comb.
  • FIG. 8 For the assembly of the pre-assembled internal parts of the spacer grids and the assembly of the tubes in these pre-assembled parts, use is made of the means represented in FIG. 8 showing the end 28a of a tube 28 being assembled in a grid. 27.
  • An ogival end piece 50 equips the end of the tube 28a to be introduced into the grid 27 which has sleeves 51 having the same internal and external diameters as the tubes 28 which were put in place when the elements of the grid were assembled. at the location which the tubes must occupy, in order to maintain a spacing of these elements corresponding exactly to the dimension of the tubes 28.
  • the sleeves 51 are held by the radial forces exerted by the elastic elements constituting the grid 27.
  • the heat exchanger according to the invention can be produced by simple and perfectly defined assembly operations.
  • the length of the ferrules 20 and 23 for connecting the tubular plates and for suspending the spacer grids can vary between certain limits.
  • this length L of the ferrules 20 and 23, in the case of a heat exchanger as used in a fast neutron nuclear reactor could be such that it verifies the following inequalities: where R is the radius of the outer shell 1b of the heat exchanger and t the thickness of the junction ferrules.
  • this thickness is generally between 6 and 10 mm.
  • the temperature difference T between the hottest parts and the coldest parts is generally close to 200 ° C.
  • the invention applies in all cases where an emergency exchanger is used for cooling the primary fluid of a nuclear reactor, this heat exchanger plunging into a tank containing the primary fluid.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
  • Structure Of Emergency Protection For Nuclear Reactors (AREA)
  • Details Of Measuring And Other Instruments (AREA)

Claims (10)

1. Sicherheitswärmetauscher zum Abkühlen des Primärfluids eines Kernreaktors, wobei das Primärfluid in einem Behälter enthalten ist, der eine im wesentlichen horizontal angeordnete Verschlußplatte (3) aufweist und der den im Primärfluid eingetauchten Reaktorkern beinhaltet, mit einem Trägerflansch (5), der dazu bestimmt ist, auf der Verschlußplatte (3) aufzuliegen, einem Bündel (17) von Austauschrohren, die klammerförmig umgelenkt und an zwei Rohrplatten.(18, 19) befestigt sind, wovon die erste (18) rohrförmig geformt ist und bezüglich der zweiten zentralen Platte (19) kreisförmig, an dessen Umfang angeordnet ist, mit einem zylinderförmigen Ring (1 b) mit vertikaler Achse, der das Bündel (17) umhüllt, das in das Primärfluid eingetaucht ist und mit zwei Leitungen (7, 8), die an ein Versorgungsleitungssystem der Rohre (28) des Bündels (17) mit thermischem Austauschfluid angeschlossen sind, das eine Kühleinrichtung des durch das Primärfluid aufgeheizten Austauschfluids, die außerhalb des Behälters angeordnet ist, aufweist, dadurch gekennzeichnet,
daß die beiden Rohrplatten (18, 19) ko-axial und horizontal auf derselben Höhe angeordnet sind und die ringförmige Rohrplatte (18) an ihrem Umfang an einem ersten Ring (15) mit vertikaler Achse befestigt ist, der oberhalb der Rohrplatten (18, 19) gelegen ist und diese mit dem Trägerflansch (5) entlang dessen innerem Rand und mit einem zweiten Ring (20) verbindet, der ko-axial zum ersten Ring (15) angeordnet ist und unterhalb der Rohrplatten (18, 19) gelegen ist, wo er ein Verbindungsstück (22) trägt, das die Platte mit einem dritten Ring (23) verbindet, der an der mittleren Rohrplatte (19) befestigt ist, und dadurch,
daß jedes der Rohre (28) des Bündels (17) aufeinanderfolgend einen vertikalen geraden Bereich (28a) aufweist, der mit der zentralen Rohrplatte (19) verbunden ist und einen gekrümmten Bereich (28b) um die Rohre (28) umzulenken, einen geraden vertikalen Umienkbereich (28c), und einen kreisrunden horizontalen Bereich (28e) auf etwa einem Drittel des Umfangs des vertikalen Bereichs (28f), der sich an die periphere Rohrplatte (18) anknüpft.
2. Wärmetauscher nach Anspruch 1, dadurch gekennzeichnet, daß das Verbindungsstück (22) an seiner Innenseite eine Gruppe von senkrechten Ziehstäben (25) zum Aufhängen der Beabstandungsgitter (27) aufweist, die die Rohre (28) des Bündels (17) in den radialen Richtungen festlegen.
3. Wärmetauscher nach einem der Ansprüche 1 und 2, dadurch gekennzeichnet, daß der zweite Ring (20) und der dritte Ring (23) in Vertikalrichtung ungefähr gleiche Länge haben, wobei diese Länge (L) durch die folgenden Ungleichungen definiert ist :
Figure imgb0004
wobei R der Radius des Rings ist, der das Rohrbündel des Wärmetauschers umhüllt und t die gemeinsame Dicke der Ringe (1b, 20 und 23).
4. Wärmetauscher nach Anspruch 3, dadurch gekennzeichnet, daß die Dicke der Verbindungsringe der Rohrplatten (20, 23) zwischen 6 und 10 mm beträgt.
5. Wärmetauscher nach einem der Ansprüche 1-4, dadurch gekennzeichnet, daß der horizontale ringförmige Bereich (28e) der Rohre (28), der deren Ausdehnung ermöglicht, in einem Bereich des Wärmetauschers (1) angeordnet ist, der oberhalb des Pegels (2) des Primärfluids im Behälter des Kernreaktors gelegen ist.
6. Wärmetauscher nach Anspruch 2, dadurch gekennzeichnet, daß die Beabstandungsgitter (27) aus einer Gruppe kreisförmiger, konzentrisch angeordneter und horizontaler Rundbewehrungen besteht, auf denen elastische Elemente (32, 43) zum Haltern der Rohre (28) befestigt sind.
7. Wärmetauscher nach Anspruch 6, dadurch gekennzeichnet, daß die elastischen Elemente Metallbänder (32) mit sinusförmiger Krümmung sind, die zwischen zwei aufeinanderfolgende Rundbewehrungen (34) geschoben sind und die die Rohrsitze (28) bilden.
8. Wärmetauscher nach Anspruch 6, dadurch gekennzeichnet, daß die Rundbewehrungen mit rundem Querschnitt und zylindrischer Form rechteckige Öffnungen (41) aufweisen, in deren Innerem unter rechtem Winkel geknickte Bereiche (44) eines Bleches eingefügt sind, das ein elastisches Haltemittel (43) der Rohre (28) gegen eine der Seiten der Rundbewehrungen (40) bildet, wobei Halterungskämme (45) in diese Bereiche (44) des elastischen Mittels (43), die mit rechtem Winkel geknickt sind (44) auf der Seite der Wehrringe (40) eingefügt sind, die nicht in Kontakt mit dem Rohr (28) steht.
9. Verfahren zur Montage eines Wärmetauschers nach einem der Ansprüche 6, 7 und 8, der mindestens ein Beabstandungsgitter (27) aufweist, die eine Gruppe von Wehrringen (34, 40) aufweist, das aufeinanderfolgende Halterungskränze der Rohre bilden, in deren Innerem die elastischen Elemente (32, 34) in Berührung mit den Rohren (28) stehen und zwei Gruppen bilden, eine innere, die in Richtung auf den mittleren Bereich des Wärmetauschers liegt und die den Bereich (28a) der Rohre (28) aufnimmt, die mit der mittleren rohrförmigen Platte (19) verbunden sind und wobei die andere Gruppe am äußeren Ring (1 b) des Wärmetauschers angeordnet ist, dadurch gekennzeichnet, daß die Gruppe der Innenkränze, die durch die Rundbewehrungen (34, 40) gebildet sind und die elastischen Elemente (32, 34) vorgefertigt ist, daß diese innere Gruppe unter den Rohrplatten (18, 19) befestigt ist, daß die Eingangsenden (28a) der Rohre (28) eines nach dem anderen in die vorgesehenen Sitze in den Beabstandungsgittern (27) eingefügt werden, bis sie eine vollständige äußere Reihe bilden, die einem Kranz der äußeren Gruppe entspricht, daß die Ringbewehrung bzw. Bewehrungen (34, 40), die diesem äußeren Kranz entspricht und die entsprechenden elastischen Elemente (32, 34) plaziert und zusammengesetzt werden, daß diese Montagevorgänge der Rohre für jeden äußeren Kranz wiederholt werden, bis das Bündel komplett montiert ist, daß die Enden der Rohre (28) in Rohrplatten (18 und 19) befestigt werden und daß schließlich der Außenring (1b), der das Bündel (17) umhüllt, plaziert und befestigt wird.
10. Verfahren zur Montage eines Wärmetauschers nach Anspruch 9, dadurch gekennzeichnet, daß zum Zeitpunkt des Zusammensetzens die inneren Kränze der Beabstandungsgitter (27) mit Hülsen (51) versehen werden, die den gleichen Durchmesser wie die Rohre (28) haben, in Positionen, die später durch diese Rohre (28) eingenommen werden, daß das Ende der Rohre (28) mit Stopfen (50) versehen wird und daß zum Zeitpunkt der Einführung der Rohre (28) in die vorgefertigten inneren Bereiche des Beabstandungsgitters (27) für jedes der Rohre die dem Rohr (28) entsprechende Hülse (51) durch Drücken mit dem Stopfen (50) weggeschoben wird, wonach das Rohr (28) Platz im Beabstandungsgitter (27) einnimmt.
EP85401459A 1984-07-26 1985-07-16 Notwärmetauscher zur Kühlung des Primärmittels eines Kernreaktors und Verfahren zu dessen Zusammenbau Expired EP0173602B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT85401459T ATE30077T1 (de) 1984-07-26 1985-07-16 Notwaermetauscher zur kuehlung des primaermittels eines kernreaktors und verfahren zu dessen zusammenbau.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8411858A FR2568363B1 (fr) 1984-07-26 1984-07-26 Echangeur de chaleur de secours pour le refroidissement du fluide primaire d'un reacteur nucleaire et procede de montage de cet echangeur de chaleur
FR8411858 1984-07-26

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Publication Number Publication Date
EP0173602A1 EP0173602A1 (de) 1986-03-05
EP0173602B1 true EP0173602B1 (de) 1987-09-30

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US (1) US4786463A (de)
EP (1) EP0173602B1 (de)
JP (1) JPH0660950B2 (de)
AT (1) ATE30077T1 (de)
DE (1) DE3560734D1 (de)
FR (1) FR2568363B1 (de)

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FR2404799A1 (fr) * 1977-09-28 1979-04-27 Commissariat Energie Atomique Generateur de vapeur pour centrale a eau pressurisee
FR2519462A1 (fr) * 1981-12-31 1983-07-08 Novatome Dispositif d'evacuation de secours de la chaleur dissipee par un reacteur nucleaire a neutrons rapides a l'arret
US4570703A (en) * 1982-02-08 1986-02-18 The United States Of America As Represented By The United States Department Of Energy Tube support grid and spacer therefor

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DE3560734D1 (en) 1987-11-05
EP0173602A1 (de) 1986-03-05
JPS6193992A (ja) 1986-05-12
FR2568363A1 (fr) 1986-01-31
ATE30077T1 (de) 1987-10-15
JPH0660950B2 (ja) 1994-08-10
US4786463A (en) 1988-11-22
FR2568363B1 (fr) 1986-12-26

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