FR2574975A1 - Shutting off the primary circuit of nuclear reactors from the steam generators - Google Patents

Shutting off the primary circuit of nuclear reactors from the steam generators Download PDF

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Publication number
FR2574975A1
FR2574975A1 FR8419320A FR8419320A FR2574975A1 FR 2574975 A1 FR2574975 A1 FR 2574975A1 FR 8419320 A FR8419320 A FR 8419320A FR 8419320 A FR8419320 A FR 8419320A FR 2574975 A1 FR2574975 A1 FR 2574975A1
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France
Prior art keywords
bowl
seal
fasteners
tape
inflatable
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Granted
Application number
FR8419320A
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French (fr)
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FR2574975B1 (en
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THOME JEAN PATRICK
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THOME JEAN PATRICK
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Priority to FR8419320A priority Critical patent/FR2574975B1/en
Publication of FR2574975A1 publication Critical patent/FR2574975A1/en
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Classifications

    • 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
    • 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
    • F16L55/115—Caps
    • F16L55/1157—Caps using hooks, pawls, or other movable or insertable locking members
    • 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
    • F16L55/12—Means for stopping flow from or in pipes or hoses by introducing into the pipe a member expandable in situ
    • F16L55/128—Means for stopping flow from or in pipes or hoses by introducing into the pipe a member expandable in situ introduced axially into the pipe or hose
    • F16L55/132—Means for stopping flow from or in pipes or hoses by introducing into the pipe a member expandable in situ introduced axially into the pipe or hose the closure device being a plug fixed by radially deforming the packing
    • F16L55/134—Means for stopping flow from or in pipes or hoses by introducing into the pipe a member expandable in situ introduced axially into the pipe or hose the closure device being a plug fixed by radially deforming the packing by means of an inflatable packing

Abstract

A method and a high-security shutting device intended for temporarily shutting off the primary pipework of the steam generators (SG) of nuclear reactors for inspection and maintenance. The method concerns the attachment of "fastenings" 961 and the local milling 970 of the surface of the water box (bowl) of the SG, to adapt it for receiving a shutter 920. The shutting device comprises a blanking plate 920 fitted by means of components, with its latching locks 963, a bearing ring 960, a single latching control mechanism and an inflatable seal 951, which are special. A ring 960 provided with a semi-sealing foot 964 is placed on the fastenings 961 welded to the bowl. The closure plate 920 wedges the lip 952 of the seal onto the ring and is attached by latches 963 to the fastenings. The inflatable beading 954 is responsible for the sealing of the inner face of the ring and on the milled bearing 970 of the bowl.

Description

OBTURATION DU CIRCUIT PRIMAIRE DE REACTEURS NUCLEAIRES DEPUIS LES GENERATEURS DE
VAPEUR
La présente invention a pour objet une méthode et un,dispositif d'obturation de haute sécurité destine a obturer temporairement les canalisations primaires des générateurs de vapeur (GV) des centrales nucleaires, pour isoler la botte à eau dans laquelle il convient d'intervenir pour contrôle, surveillance ou encore pour réparation.BLOCKING OF THE PRIMARY CIRCUIT OF NUCLEAR REACTORS FROM GENERATORS OF
STEAM
The subject of the present invention is a method and a high-security shutter device intended to temporarily shut off the primary pipes of steam generators (steam generators) for nuclear power plants, to isolate the water boot in which it is necessary to intervene to control, monitoring or even for repair.

La methode concerne la fixation d"'attaches" à l'intérieur de la botte à eau du générateur de vapeur, la preparation de surface du générateur de vapeur pour la rendre apte à l'application d'un joint d'étanchéité, les outils par lesquels ces Operations seront réalisées en semi-automatique.The method relates to the fixing of "fasteners" inside the water boot of the steam generator, the surface preparation of the steam generator to make it suitable for the application of a seal, the tools by which these Operations will be carried out semi-automatically.

Le dispositif de mise en oeuvre du procédé comprend un obturateur (tape) avec ses moyens de clampage originaux, un anneau d'appui et-un joint particuliers.The device for implementing the method comprises a shutter (tape) with its original clamping means, a support ring and a particular seal.

L'une des techniques actuellement utilisée consiste à venir visser une tape sur une bride soudée sur la botte à eau (bol) du GV, tape qui vient écraser un joint d'étanchéité circulaire plat. Cette tape est vissée soit manuellement, sinon par un dispositif automatique. Au fil des manoeuvres, ces filetages se-détériorent, leur réfection est coûteuse en doses de rayonnement reçues par le personnel d'intervention.One of the techniques currently used consists in screwing a tape on a flange welded to the water boot (bowl) of the SG, tape which comes to crush a flat circular seal. This tape is screwed either manually, otherwise by an automatic device. Over the maneuvers, these threads deteriorate, their repair is costly in radiation doses received by the intervention personnel.

Dans les générateurs de vapeur dépourvus d'une telle bride de fixation et d'étanchéité, on a été conduit dans certains cas à usiner des logements dans la paroi du GV, dans lesquels seront introduits des doigts de fixation reprenant les efforts exercés sur la tape.In steam generators lacking such a fixing and sealing flange, in certain cases it has been necessary to machine housings in the wall of the GV, into which fixing fingers will be introduced taking up the forces exerted on the tape. .

La présente invention propose une méthode qui est applicable à l'ensemble des générateurs de vapeur existants. Elle apporte un dispositif de haute fiabilité qui n'est pas susceptible d'une brêche ou d'une rupture soudaine. The present invention provides a method which is applicable to all existing steam generators. It provides a highly reliable device which is not susceptible to a sudden breach or break.

Dans ce qui suit l'invention est exposée plus en détail à l'aide de dessins représentant certains modes de réalisation et de mise en oeuvre. La figure 1 situe la botte à eau des échangeurs de vapeur des réacteurs à eau pressurisée.In what follows the invention is explained in more detail with the help of drawings representing certain embodiments and implementation. Figure 1 locates the water boot of the steam exchangers of pressurized water reactors.

Les figures 2 et 3 sont relatives à la conception mécanique des éléments de la tape et leur fixation sur un type de bride existant dans certains GV à l'orifice des tubulures primaires. La figure 4 montre le détail d'accostage de la tape sur la bride, et la portée d'étanchéité du joint. La figure 5 schématise la cinématique de montage d'une tape d'obturation sur une bride. Enfin, les figures 6 et 7 se rapportent au montage d'une tape placée sur des attaches soudées dans la boite à eau des GV dépourvus de bride, où le dispositif d'étanchéité#s'appuie sur une bride amovible de substitution; et aux appareillages de préparation du bol pour recevoir ces attaches soudées.Figures 2 and 3 relate to the mechanical design of the elements of the tape and their attachment to a type of flange existing in some GV at the orifice of the primary pipes. Figure 4 shows the detail of docking of the tape on the flange, and the sealing surface of the seal. Figure 5 shows schematically the kinematics of mounting a shutter tape on a flange. Finally, Figures 6 and 7 relate to the mounting of a tape placed on welded fasteners in the water box of the SGs without flange, where the sealing device # rests on a removable substitution flange; and to the bowl preparation apparatus for receiving these welded fasteners.

La botte à eau, ou bol (fig.la,b) à la partie inférieur d'un GV est une demi-sphère formée de deux chambres 901, 902 séparées par une plaque verticale 903 , elle est surplombée d'une plaque tubulaire 904. Chaque chambre possède deux ouvertures: le trou d'homme 905, d'accès, de diamêtre 400mu et la tubulure primaire 906 de diamêtre 800mm environ. Sur certains types de GV, une bride circulaire 907 est soudée à l'intérieur du bol au débouché de cette tubulure, en attente de la pose d'un dispositif d'obturation.The water boot, or bowl (fig. La, b) at the bottom of a GV is a hemisphere formed by two chambers 901, 902 separated by a vertical plate 903, it is overhung by a tubular plate 904 Each room has two openings: the manhole 905, of access, of diameter 400mu and the primary tubing 906 of diameter 800mm approximately. On certain types of GV, a circular flange 907 is welded inside the bowl at the outlet of this tubing, awaiting the installation of a closure device.

Les sollicitations mécaniques auquelles est soumis l'obturateur correspondent å une différence de pression de l'ordre de deux bars en statique soit un effort de 10 tonnes environ sur la tape d'obturation, et éventuellement de cinq bars en cas de phénomènes transitoires hydrodynamiques.The mechanical stresses to which the shutter is subjected correspond to a pressure difference of the order of two bars in static, ie an effort of around 10 tonnes on the shutter tape, and possibly five bars in the event of transient hydrodynamic phenomena.

Pour la fixation, nous avons écarté la pose de vis ou de boulons car c'est une opération longue, s'accompagnant de risques de détérioraton des filetages, et nous avons choisi un systeme de verrouillage rapide sur des pièces spéciales fixées définitivement sur les brides quand elles existent, ou directeient soudées sur le bol GV. For fixing, we discarded the installation of screws or bolts because it is a long operation, accompanied by risks of deterioration of the threads, and we chose a quick locking system on special parts permanently fixed on the flanges when they exist, or directly welded to the GV bowl.

De plus, comme un systeme de verrouillage simple se combine mal avec une étanchéité réalisée par un joint serré sur la bride ou la surface du bol, et d'ailleurs peu adaptée à une pression de 5 bars; nous avons adopté un joint gonflable dont l'action est indépendante de la fixation de la tape, et qui assurera sans difficulté l'étanchéité à 5 bars.In addition, as a simple locking system is poorly combined with a seal produced by a tight seal on the flange or the surface of the bowl, and moreover unsuitable for a pressure of 5 bars; we have adopted an inflatable seal whose action is independent of the fixing of the tape, and which will easily ensure the watertightness at 5 bars.

La structure de la tape se décompose en cinq éléments rigides dont les dimensions sont choisies de manière à permettre une introduction facile par le trou d'homme avec un poids élémentaire faible d'une douziane de kilogs. Chaque élément, en commençant par l'élément central, est positionné sur les pièces spéciales en attente dans le bol, à savoir des tourillons fixés sur les brides ou des attaches soudées sur la paroi du GV, pour former un ensemble qui sera verrouillé par une seule commande.The structure of the tape is broken down into five rigid elements whose dimensions are chosen so as to allow easy introduction through the manhole with a low elementary weight of a dozen kilograms. Each element, starting with the central element, is positioned on the special pieces waiting in the bowl, namely pins fixed on the flanges or clips welded to the wall of the SG, to form an assembly which will be locked by a single order.

Description de la tape venant sur une bride (figures 2 et 3):
Cette tape comprend donc un élément central 920 verrouillé sur deux tourillons 921 diamétralement opposés, deux éléments intermédiaires 922 placés de part et d'autre qui se verrouillent chacun sur quatre tourillons 921, et enfin deux éléments extérieurs 923 verrouillés chacun sur quatre tourillons, qui viennent compléter le cercle.Description of the tape coming on a flange (Figures 2 and 3):
This tape therefore comprises a central element 920 locked on two diametrically opposite pins 921, two intermediate elements 922 placed on either side which are each locked on four pins 921, and finally two external elements 923 each locked on four pins, which come complete the circle.

Ces éléments ou caissons se composent d'une bride extérieure 924 formant une portion de cercle, d'une plaque supérieure évidée 925 soudée sur la bride, d'une plaque 926 formant fond et reliée à la plaque supérieures par des plats de forme circulaire 927 et 928, et deux plats de bordure 929. Chaque élément comporte deux poignées pour en faciliter la manutention.These elements or boxes consist of an outer flange 924 forming a portion of a circle, of a recessed upper plate 925 welded to the flange, of a plate 926 forming the bottom and connected to the upper plate by dishes of circular shape 927 and 928, and two border plates 929. Each element has two handles for easier handling.

Les tourillons 921 comportent une tête de forme conique pour faciliter le positionnement des éléments de tape, avec une rainure circulaire 930 dans laquelle vient s'engager un verrou 931.The pins 921 have a conical head to facilitate the positioning of the tape elements, with a circular groove 930 in which engages a lock 931.

Pour chacun des cinq éléments de la tape, le système de blocage comporte un levier central basculant 932 qui passe de la position verrou fermé (élément central sur la figure 2) à la position verrou ouvert; le maintien dans chacune des deux positions est assuré par un ressort 933. Sur l'élément central 920, ce levier commande deux poussoirs 934 portant en bout chacun un verrou 93-1 qui vient s'engager dans la rainure 930 d'un tourillon 921. Pour les quatre autres éléments, le mécanisme comporte des balanciers 935 permettant de commander deux verrous à la fois de chaque côté.For each of the five elements of the tape, the blocking system comprises a rocking central lever 932 which passes from the closed lock position (central element in FIG. 2) to the open lock position; the holding in each of the two positions is ensured by a spring 933. On the central element 920, this lever controls two pushers 934 each carrying at the end a lock 93-1 which engages in the groove 930 of a journal 921 For the other four elements, the mechanism includes pendulums 935 allowing two latches to be controlled at the same time on each side.

Une seule commande centrale sert à engager les verrous 931 dans les tourillons 921 (figure 3). Sur chaque axe de rotation des leviers de commande 932 est claveté un levier 936. commandant deux poussoirs 937 et 938 par deux ergots 941. A single central control is used to engage the locks 931 in the pins 921 (Figure 3). On each axis of rotation of the control levers 932 is keyed a lever 936. controlling two pushers 937 and 938 by two lugs 941.

Chacun de ces poussoirs coulisse dans deux alésages 939 et 940, et est réglé de manière à affleurer de chaque côté d'un élément de tape lorsque le verrou est en position dégagée afin de ne pas en gêner la pose et la dépose.Each of these pushers slides in two bores 939 and 940, and is adjusted so as to be flush with each side of a tape element when the lock is in the released position so as not to interfere with the fitting and removal.

De cette façon, il suffit d'actionner le levier central au moyen d'une clef ou éventuellement d'un vérin pneumatique pour faire pivoter les cinq leviers simultanément et engager les 18 verrous. In this way, it is enough to activate the central lever by means of a key or possibly a pneumatic cylinder to rotate the five levers simultaneously and engage the 18 latches.

Le joint d'étanchéité circulaire (figure 4} se compose d'un disque 950 couvrant la face inférieure de la tape assemblée, d'un cordon gonflable 951 assurant l'étanchéité, et d'un anneau plat 952 pour son positionnement sur la bride.The circular seal (Figure 4} consists of a disc 950 covering the underside of the assembled tape, an inflatable cord 951 ensuring the seal, and a flat ring 952 for its positioning on the flange .

Le disque 950 assure simplement l'étanchéité de l'assemblage des éléments de tape. Le cordon gonflable, en réaction sur la bride 924 et le plat extérieur 927 de la tape, vient en appui sur la face interne de la bride 907 du bol GV. Enfin, l'anneau 952 est coincé entre la façe supérieure de la bride 907 du GV et la bride 924 de la tape.The disc 950 simply seals the assembly of the tape elements. The inflatable cord, in reaction on the flange 924 and the outer flat 927 of the tape, comes to bear on the internal face of the flange 907 of the bowl GV. Finally, the ring 952 is wedged between the upper face of the flange 907 of the SG and the flange 924 of the tape.

Cette disposition assure en pratique une sécurité en cas de défaillance du joint gonflable, l'anneau 952 du joint serrée sous la tape limitera le débit de fuite, évitant une inondation brutale.This provision in practice provides security in the event of failure of the inflatable seal, the ring 952 of the seal tightened under the tape will limit the leak rate, avoiding sudden flooding.

Cinématique de mise en place (figure 5):
Le joint est préalablement fixé sur l'élément central 920 de la tape, puis roulé en accrochant les deux extrémités du joint -l'un sur l'autre, constituant ainsi un ensemble qui est introduit par le trou d'homme et mis en place en une seule opération. La tétine de gonflage est fixée sur cet élément 920.Installation kinematics (Figure 5):
The joint is fixed beforehand on the central element 920 of the tape, then rolled by hooking the two ends of the joint - one on the other, thus constituting an assembly which is introduced by the manhole and put in place in one operation. The inflation nipple is fixed to this element 920.

Lorsque l'élément central est en place sur ses deux tourillons 921, il suffit de dégager l'attache du joint qui se déroule pour se positionner sur la bride 907.When the central element is in place on its two pins 921, it suffices to release the attachment of the seal which is unrolled to position itself on the flange 907.

L'anneau 952 est engagé sur les pions de fixation.The ring 952 is engaged on the fixing pins.

Les autres éléments 922 et 923 de la tape sont ensuite placés pa#r rapport à l'élément central, avant d'actionner la commande centrale 932 de verrouillage sur les tourillons. Cette mise en place terminée, l'opérateur sort du bol GV, et le joint est gonflé de l'extérieur.The other elements 922 and 923 of the tape are then placed pa # r relative to the central element, before actuating the central locking control 932 on the pins. When this positioning is complete, the operator leaves the GV bowl, and the seal is inflated from the outside.

Méthode et dispositif d'obturation pour un GV sans bride 907 (figures 6 et 7):
En cas d'absence de bride, on viendra souder des "attaches" 961 sur le revetement inox 971 du bol et on meulera une surface 970 qui-servira d'appui au joint d'étanchéité 951.Sealing method and device for a 907 flangeless GV (Figures 6 and 7):
In the absence of a flange, we will weld "fasteners" 961 to the stainless steel coating 971 of the bowl and we will grind a surface 970 which will serve as a support for the gasket 951.

Pour ce faire, un gabarit circulaire 975 (figure 7) est positionné manuellement sur le bol au débouché de la tubulure primaire, et il y- est fixé provisoirement par quelques points de soudure. Il comprend 18 logements 972 (à la place des 18 tourillons 921) contenant des cales de mesure servant à ajuster la hauteur des attaches définitives 961 en fonction de la géométrie du bol GV. Ces attaches ,sont préparées en atelier puis échangées manuellement avec les cales; elles sont soudées sur le revetement inox.To do this, a circular template 975 (Figure 7) is positioned manually on the bowl at the outlet of the primary tubing, and there- is temporarily fixed by a few welding points. It includes 18 housings 972 (in place of the 18 pins 921) containing measuring shims used to adjust the height of the permanent fasteners 961 according to the geometry of the GV bowl. These fasteners are prepared in the workshop and then exchanged manually with the shims; they are welded to the stainless steel coating.

Le gabarit sert également dez chemin de roulement sur lequel est placée une poutre 973 automotrice 976- portant soit une tête de soudage des attaches, soit une meuleuse 974 pour usiner sur le bol la portée 970 du joint gonflable d'étanchéité.The template also serves as a raceway on which is placed a self-propelled beam 973 976- carrying either a welding head for the fasteners, or a grinder 974 for machining on the bowl the surface 970 of the inflatable seal.

Ces opérations terminées, le gabarit est évacue, et ne subsiste dans le bol que les attaches soudées.These operations completed, the template is evacuated, and remains in the bowl only the welded fasteners.

Pour la mise en place d'une tape d'obturation sur ces attaches, on utilise au préalable un anneau amovible 960 de supportage du joint gonflable.For the installation of a sealing tape on these fasteners, a removable ring 960 for supporting the inflatable seal is used beforehand.

L'anneau amovible 960, (figure 6), introduit replié par le trou d'homme, est positionné sur les attaches 961. Le joint gonflable et les éléments de la tape d'obturation sont ensuite mis en place comme précédemment. Sur la figure 6, les attaches sont figurées ici comme des plaques métalliques dressées, comportant une lumière 962 dans laquelle se glisse un pêne 963, variante du verrou 931 sur le tourillon 921 pour la tape précédente.The removable ring 960 (FIG. 6), introduced folded back through the manhole, is positioned on the fasteners 961. The inflatable seal and the elements of the sealing tape are then put in place as before. In Figure 6, the fasteners are shown here as upright metal plates, comprising a slot 962 in which slides a bolt 963, variant of the lock 931 on the pin 921 for the previous step.

Le dessin du joint est légèrement différent de manière à ce que le cordon gonflable 951 prenne appui la fois sur l'anneau 960 et sur la portée usinée sur le bol. De plus, cet anneau possède un joint de semi-étanchéité 964 qui s'applique sur le bol. The seal design is slightly different so that the inflatable cord 951 is supported both on the ring 960 and on the surface machined on the bowl. In addition, this ring has a semi-seal 964 which is applied to the bowl.

Ainsi, la tape verrouillée sur les attaches assure une première étanchéité en écrasant le joint 964 de l'anneau amovible sur le bol et le disque 952 du joint gonflable sur l'anneau.Thus, the tape locked on the fasteners provides a first seal by crushing the seal 964 of the removable ring on the bowl and the disc 952 of the inflatable seal on the ring.

Cette disposition assure donc, comme la précedente, une sécurité en cas de défaillance du cordon gonflable 951, en évitant une inondation brutale. This provision therefore provides, like the previous one, security in the event of failure of the inflatable cord 951, by avoiding a sudden flood.

Claims (6)

REVENDICATIONS:CLAIMS: 1. Méthode d'obturation du circuit primaire de réacteurs nucléaires à eau pressurisee destinée à isoler le générateur de vapeur (GV), où l'étanchéité est assurée par un joint gonflable, caractérisée en ce que: - des pattes 961 ("attaches") sont préalablement soudées dans le bol autour de la tubulure du circuit primaire, - le revètement en acier inox 971 de la surface du bol est meulé de façon à offrir une portée convenable 970 pour un joint d'étanchéité 951.1. Method for closing the primary circuit of pressurized water nuclear reactors intended to isolate the steam generator (GV), where the seal is ensured by an inflatable seal, characterized in that: - legs 961 ("fasteners") ) are previously welded in the bowl around the tubing of the primary circuit, - the stainless steel coating 971 of the surface of the bowl is ground so as to provide a suitable surface 970 for a gasket 951. 2. Obturateur (tape) conçu en plusieurs#éléments résistants, assemblés dans la boite à eau, caractérisé par: - un joint d'étanchéité 950 fixé sur l'élément central 920, recouvrant complètement la tape après juxtaposition des éléments résistants 922 et 923, - des pênes 934 solidaires de chaque élément, qui verrouillent ces éléments dans les attaches, et reprennent les efforts exercés sur la tape, - une commande unique 932 entraînant simultanément la manoeuvre de tous les pênes.2. Shutter (tape) designed in several # resistant elements, assembled in the water box, characterized by: - a seal 950 fixed on the central element 920, completely covering the tape after juxtaposition of the resistant elements 922 and 923 , - bolts 934 integral with each element, which lock these elements in the fasteners, and take up the forces exerted on the tape, - a single control 932 simultaneously driving the operation of all the bolts. 3. Joint gonflable d'étanchéité selon la revendication 2, caractérisé en ce qu'il comporte - une lèvre (anneau) 952 s'appuyant sur une couronne circulaire 907 ou 960, assurant une semi-étanchéité en cas de dégonflage accidentel du joint, - des orifices dans lesquels s'engagent les pattes 961 ou les pions 921 fixes sur le bol, servant à positionner le joint et à éviter son aspiration; - un cordon gonflable annulaire 951 venant faire étanchéité sur la surface du bol, - un disque 950 couvrant toute la surface inférieure de la tape.3. Inflatable sealing joint according to claim 2, characterized in that it comprises - a lip (ring) 952 resting on a circular crown 907 or 960, ensuring semi-sealing in the event of accidental deflation of the joint, - orifices into which the legs 961 or the pins 921 fixed on the bowl engage, serving to position the seal and to avoid its aspiration; - an annular inflatable cord 951 sealing on the surface of the bowl, - a disc 950 covering the entire lower surface of the tape. 4. Anneau amovible 960 de supportage du joint selon les revendications lt 2 et 3, caractérisé en ce qu'il s'engage sur les pattes de fixation 961, possède un joint de semi-étanchéité 964 portant sur la paroi du GV, et possède une face plane supérieure sur laquelle s'appuit le joint, et où sa face cylindrique interne sert d'appui au cordon gonflable 951. 4. Removable ring 960 for supporting the joint according to claims 2 and 3, characterized in that it engages on the fixing lugs 961, has a semi-sealing joint 964 bearing on the wall of the SG, and has an upper flat face on which the seal rests, and where its internal cylindrical face serves as a support for the inflatable cord 951. 5. Dispositif de fixation des attaches selon 1, caractérisé en ce qu'il comprend un gabarit (couronne) 975 de positionnement des attaches 961, des cales de mesures permettant d'ajuster la hauteur des attaches à la géométrie du bol, et une poutre 975 automotrice 976 porte-outils se déplaçant sur la couronne pour le soudage des attaches ou le meulage 974 d'une portée d'étanchéité 970 sur le bol. 5. Fastening device for the fasteners according to 1, characterized in that it comprises a template (crown) 975 for positioning the fasteners 961, measuring shims for adjusting the height of the fasteners to the geometry of the bowl, and a beam 975 self-propelled 976 tool holder moving on the crown for welding the fasteners or grinding 974 of a sealing surface 970 on the bowl. 6. Bride 907 soudée sur le GV, permettant la mise en place de l'obturateur selon la revendication 2, caractérisée en ce qu'elle possède des pions 921 de fixation servant de serrures pour les penes 931 de l'obturateur 924. 6. Flange 907 welded to the GV, allowing the fitting of the shutter according to claim 2, characterized in that it has fixing pins 921 serving as locks for the pins 931 of the shutter 924.
FR8419320A 1984-12-18 1984-12-18 CLOSURE OF THE PRIMARY CIRCUIT OF NUCLEAR REACTORS SINCE THE STEAM GENERATORS Expired FR2574975B1 (en)

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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0315011A1 (en) * 1987-11-05 1989-05-10 Siemens Aktiengesellschaft Seal for a nozzle discharging in a reservoir, particularly a steam generator
EP0330054A1 (en) * 1988-02-23 1989-08-30 Siemens Aktiengesellschaft Quick-acting clamping device for the loose connection of two building elements
EP0373338A2 (en) * 1988-12-15 1990-06-20 Combustion Engineering, Inc. Remotely installed steam generator nozzle dam system
EP0488639A1 (en) * 1990-11-26 1992-06-03 Westinghouse Electric Corporation A nozzle dam and process for closing off a nozzle of a steam generator
EP0497634A1 (en) * 1991-02-01 1992-08-05 Westinghouse Electric Corporation Apparatus for sealing a conduit
FR2710128A1 (en) * 1993-09-15 1995-03-24 Rust Utility Services Inc Nozzle dam system for a quick-install nuclear steam generator vessel without a bolt.
EP2440836A1 (en) * 2009-06-10 2012-04-18 Westinghouse Electric Company LLC Domed diaphragm/insert plate for a pressure vessel access closure

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2340489A1 (en) * 1976-02-09 1977-09-02 Framatome Sa Temporary cover plate for large duct openings - has hinged plate with rectangular access hole and door
US4121383A (en) * 1977-07-11 1978-10-24 Perry Oceanographics, Inc. Closure mechanism for a door
EP0014878A1 (en) * 1979-02-02 1980-09-03 Combustion Engineering, Inc. Nozzle plug for steam generator
FR2532715A1 (en) * 1982-09-07 1984-03-09 Thome Paul Shutoff device for the primary circuit of nuclear reactors.
EP0121172A1 (en) * 1983-03-31 1984-10-10 Lummus Crest Sarl Hinged steam generator nozzle plug

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2340489A1 (en) * 1976-02-09 1977-09-02 Framatome Sa Temporary cover plate for large duct openings - has hinged plate with rectangular access hole and door
US4121383A (en) * 1977-07-11 1978-10-24 Perry Oceanographics, Inc. Closure mechanism for a door
EP0014878A1 (en) * 1979-02-02 1980-09-03 Combustion Engineering, Inc. Nozzle plug for steam generator
FR2532715A1 (en) * 1982-09-07 1984-03-09 Thome Paul Shutoff device for the primary circuit of nuclear reactors.
EP0121172A1 (en) * 1983-03-31 1984-10-10 Lummus Crest Sarl Hinged steam generator nozzle plug

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0315011A1 (en) * 1987-11-05 1989-05-10 Siemens Aktiengesellschaft Seal for a nozzle discharging in a reservoir, particularly a steam generator
EP0330054A1 (en) * 1988-02-23 1989-08-30 Siemens Aktiengesellschaft Quick-acting clamping device for the loose connection of two building elements
US4946209A (en) * 1988-02-23 1990-08-07 Siemens Aktiengesellschaft Fast-acting clamping device for releasably connecting two components
EP0373338A2 (en) * 1988-12-15 1990-06-20 Combustion Engineering, Inc. Remotely installed steam generator nozzle dam system
EP0373338A3 (en) * 1988-12-15 1991-06-05 Combustion Engineering, Inc. Remotely installed steam generator nozzle dam system
EP0488639A1 (en) * 1990-11-26 1992-06-03 Westinghouse Electric Corporation A nozzle dam and process for closing off a nozzle of a steam generator
EP0497634A1 (en) * 1991-02-01 1992-08-05 Westinghouse Electric Corporation Apparatus for sealing a conduit
FR2710128A1 (en) * 1993-09-15 1995-03-24 Rust Utility Services Inc Nozzle dam system for a quick-install nuclear steam generator vessel without a bolt.
EP2440836A1 (en) * 2009-06-10 2012-04-18 Westinghouse Electric Company LLC Domed diaphragm/insert plate for a pressure vessel access closure
EP2440836A4 (en) * 2009-06-10 2014-04-30 Westinghouse Electric Corp Domed diaphragm/insert plate for a pressure vessel access closure
US9285033B2 (en) 2009-06-10 2016-03-15 Westinghouse Electric Company Llc Domed diaphragm / insert plate for a pressure vessel access closure

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