EP0072736B1 - Wärmetauscher mit Doppelbarriere - Google Patents

Wärmetauscher mit Doppelbarriere Download PDF

Info

Publication number
EP0072736B1
EP0072736B1 EP82401472A EP82401472A EP0072736B1 EP 0072736 B1 EP0072736 B1 EP 0072736B1 EP 82401472 A EP82401472 A EP 82401472A EP 82401472 A EP82401472 A EP 82401472A EP 0072736 B1 EP0072736 B1 EP 0072736B1
Authority
EP
European Patent Office
Prior art keywords
matrix
heat exchanger
primary
exchanger according
conduit
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
Application number
EP82401472A
Other languages
English (en)
French (fr)
Other versions
EP0072736A1 (de
Inventor
Jean Edmond Chaix
Jean Claude Chaix
Jean Louis Chaix
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.)
Commissariat a lEnergie Atomique et aux Energies Alternatives CEA
Original Assignee
Commissariat a lEnergie Atomique CEA
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 Commissariat a lEnergie Atomique CEA filed Critical Commissariat a lEnergie Atomique CEA
Publication of EP0072736A1 publication Critical patent/EP0072736A1/de
Application granted granted Critical
Publication of EP0072736B1 publication Critical patent/EP0072736B1/de
Expired legal-status Critical Current

Links

Images

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
    • F28D7/0008—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 one medium being in heat conductive contact with the conduits for the other medium
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F2265/00—Safety or protection arrangements; Arrangements for preventing malfunction
    • F28F2265/16—Safety or protection arrangements; Arrangements for preventing malfunction for preventing leakage
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F2275/00—Fastening; Joining
    • F28F2275/02—Fastening; Joining by using bonding materials; by embedding elements in particular materials
    • 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
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S165/00—Heat exchange
    • Y10S165/001—Heat exchange with alarm, indicator, recorder, test, or inspection means
    • Y10S165/008—Leakage

Definitions

  • the subject of the present invention is a double barrier heat exchanger more specifically intended for refrigerating radioactive primary water from a sampling circuit of a water reactor and making it possible in particular to detect a leak of the primary liquid at said exchanger.
  • a number of auxiliary circuits are connected to the primary circuit of a nuclear reactor, making it possible to verify the proper functioning of this circuit and, if necessary, to adjust the characteristics of the primary fluid.
  • the sampling circuit used to take samples of the primary liquid for analysis, it is necessary to cool the primary liquid coming from the heart before taking the sampling. For this, it is cooled via a secondary refrigeration circuit.
  • Most of the exchangers currently used do not provide total protection of the secondary circuit against the risks of pollution by the primary fluid and, in general, do not allow rapid detection of an accidental leak of the latter.
  • the object of the present invention is precisely a heat exchanger which not only makes it possible to protect the secondary circuit against the risks consecutive to a deterioration of the primary circuit, but which also makes it possible to quickly detect a leak of the primary liquid.
  • the radioactive primary fluid circulating in a primary sheath and the secondary fluid circulating in a secondary sheath comprises a junction matrix, disposed between the two sheaths and in contact with them, this matrix being in the form of a compact metallic mass and comprising at least one element capable of diffusing into the primary fluid when it is in contact with it and of being made radioactive under l action of an activation source.
  • the junction matrix is metallic and is in compact form ensures good thermal conductivity between the primary and secondary sheaths and gives good mechanical resistance to the entire device.
  • the element capable of being made radioactive when it is entrained by the primary fluid is silver.
  • an exchanger consists of two "barriers", one between the primary sheath and the matrix, the other between the matrix and the secondary sheath.
  • the device according to the invention has increased security because it makes it possible to detect an anomaly at the level of the first barrier (for example leakage of the primary liquid) well before the second is attacked in turn.
  • the primary liquid attacks the matrix and silver ions begin to diffuse in the primary circuit of the reactor: during the passage through the core, they are activated in silver 110 under the action of the neutron flux.
  • This anomaly can then be detected in the form of an increase in the peak of this radioelement in the radiochemical spectrum carried out periodically on primary samples: the rupture of the first barrier of the exchanger can therefore be detected very quickly by monitoring this peak .
  • the secondary sheath has a coefficient of thermal expansion substantially equal to that of the junction matrix, which makes it possible to avoid the drawbacks due to the phenomena of thermal expansion.
  • the primary circuit 1 of a nuclear reactor allowing the primary fluid to pass from the core 2 where it heats up in contact with the fuel claddings to a heat exchanger 4 where it cools contact of the fluid circulating in the secondary circuit 6 of the reactor before returning to the core.
  • a sampling circuit 8 On the primary circuit, and downstream of the exchanger 4, is connected a sampling circuit 8 making it possible to take samples of the primary fluid for analysis.
  • the primary fluid is still too hot to be able to take these samples and it is necessary to cool it with a fluid circulating in a secondary refrigeration circuit 10, this cooling taking place in a heat exchanger. heat 12.
  • Various embodiments are possible for such an exchanger, depending on the geometry of the sheath primary and secondary sheath.
  • the primary sheath has the form of a straight tube 14 surrounded by an annular enclosure 16 in which circulates the secondary coolant, the primary tube 14 and the annular enclosure 16 being separated by a space 18 filled with the junction matrix used in the context of the present invention.
  • the primary sheath still has the shape of a cylindrical tube 20, but the secondary sheath 22 has the shape of a serpentine surrounding the primary sheath and embedded inside a matrix 24 placed all around the tube 20 and in contact with it.
  • the primary sheath 26 which has the shape of a coil embedded in a junction matrix 28, the latter being placed between two external and internal cylindrical walls referenced 30 and 32 respectively on the face.
  • the secondary fluid circulates on the one hand in the tubular space 34 delimited by the internal wall 32 and on the other hand in an annular space 36 delimited by the external wall 30 and an external wall 38.
  • FIG. 5 it illustrates a particular embodiment of an exchanger according to the invention in which the primary sheath has the shape of a coil while the secondary liquid circulates in the spaces defined by the threads of two screws to not square.
  • the primary liquid arrives in the exchanger, which has a cylindrical shape and has the general reference 11 in the drawing, through an inlet orifice 42 located at one end and leaves at the other end through an outlet orifice 44 after have circulated in a coil 46 whose axis is substantially coincident with that of the tube 11.
  • This coil is embedded in a junction matrix 47 which is made of an alloy of silver and copper.
  • a cylindrical wall48 Inside the cylinder defined by the coil 46, and in contact with the matrix 47, is arranged a cylindrical wall48, called “internal cylindrical wall in the remainder of this text, of the same axis as the tube 11, while a piece 49, externally threaded, is placed inside the wall 48 so that its thread is in contact with the internal face of the latter.
  • the longitudinal section of the thread of the piece 49 has substantially the shape of a square and that is why this piece is called "square pitch screw".
  • the matrix 47 On the outside of the cylinder defined by the coil 46, the matrix 47 is in contact with a second cylindrical wall 50, called “external cylindrical wall", which is none other than the internal face of a second threaded square screw 51 externally, and inside which are arranged the matrix 47, the coil 46 and the first square-pitch screw 49. Finally, an external wall 52 is in contact, on the one hand with the thread of the screw 51 and, on the other hand, with the external envelope 53 of the tube 11.
  • the secondary fluid enters through an orifice 54 located at the end of the tube 11 through which the primary liquid is discharged into a hole 55 formed inside the part 49 and substantially along its axis.
  • An orifice 56 places the hole 55 in communication with the spaces delimited on the one hand by the threads of the screws 49 and 51, on the other hand by the walls 48 and 52.
  • the secondary fluid therefore follows a double helical path around the primary coil 46 before being evacuated to the other end of the tube 10 by an outlet orifice 58.
  • This arrangement makes it possible to have a good heat exchange coefficient and gives the device good rigidity, which makes it possible to reduce the thickness internal and external cylindrical walls.
  • the matrix 47 is a binary alloy of copper and silver, obtained by casting a ternary eutectic alloy of silver, copper and cadmium, the latter volatilizing at the time of casting.
  • the primary coil is made of an alloy with a high nickel content (for example Inconel 800 or Incoloy) so as not to deteriorate the primary sheath when the casting -
  • the other parts of the exchanger, and in particular the square pitch screws constituting the secondary sheaths are made of 316 L stainless steel. The use of this steel grade makes it possible to avoid problems of expansion since the coefficient of thermal expansion of stainless steel is 17.
  • this matrix constitutes an excellent thermal bridge between the primary and secondary sheaths thanks to the good conductivity of silver and copper.
  • this alloy has good mechanical strength, which makes it possible to reduce the thickness of the primary tube and the secondary sheaths, the thickness of these elements being determined solely as a function of corrosion problems.
  • Two cavities 60 and 61 are provided at each end of the tube 11 in order to recover the primary or secondary liquid which can escape in the event of a leak.
  • the outer casing 53 of the tube 11 is protected against overpressure following a leak by a safety valve 62.
  • the detection of leaks with such a device is done as follows: if the primary tube 46 is pierced, the primary fluid comes into contact with the alloy constituting the junction matrix, attacking it, and silver ions will diffuse in the primary circuit and activate silver 110 after passing through the reactor core. The primary sheath leak is therefore detected by observing the peak of the silver on the radiochemistry spectrum carried out periodically.
  • the primary water escaping from the coil 46 can make its way along it and reach the end pieces bearing the reference 63 in the drawing and, from there, enter the cavities 60 or 61.
  • the liquid circulating in the primary coil 46 being under high pressure, it follows an increase in pressure in the cavity 61, and therefore a displacement of the valve 62, which frees the evacuation orifice 65: it is therefore possible to detect the operating anomaly for example by means of a alarm which is triggered when the liquid leaves through this orifice 65.
  • the primary liquid can also attack the junction matrix and thus reach the wall limiting the secondary sheath. At this time, under the effect of the pressure, the matrix may become detached or the liquid progress along the interface and the primary fluid flows along this interface to the end pieces.
  • the leak can still be detected thanks to the safety valve 62.
  • the attack phenomenon of the junction matrix is sufficiently slow to allow the detection of the anomaly by observation of the silver peak 110, generally well before the fluid reaches the cavities 60 or 61: we can therefore intervene quickly to replace the defective device before complete destruction of it .
  • the device according to the invention has particularly advantageous advantages since it allows good heat exchange between the primary liquid and the secondary liquid, good mechanical strength of the assembly even with thin walls, and also allows rapid detection. a leak at the primary sheath, since in the event of piercing of the latter, one of the elements constituting the junction matrix diffuses into the primary liquid and can be easily detected by spectrographic control.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Monitoring And Testing Of Nuclear Reactors (AREA)
  • Examining Or Testing Airtightness (AREA)

Claims (11)

1. Wärmetauscher mit Doppelbarriere zwischen einer in einer Primärleitung (20) umlaufenden radioaktiven Primärflüssigkeit une einer in einer Sekundärleitung (22) umlaufenden Sekundärflüssigkeit, dadurch gekennzeichnet, daß er eine zwischen den beiden Leitungen (20, 22) und in Berührung mit diesen angeordnete Übergangsmatrix (24) aufweist, welche sich in Form einer kompakten metallischen Masse darstellt und wenigstens ein Element enthält, welches bei Berührung mit der Primärflüssigkeit in dieser diffundierbar und unter Einwirkung einer Aktivierungsquelle radioaktiv machbar ist.
2. Wärmetauscher nach Anspruch 1, dadurch gekennzeichnet, daß der Wärmedehnungskoeffizient der Sekundärleitung (22) im wesentlichen gleich demjenigen der Übergangsmatrix (24) ist.
3. Wärmetauscher nach Anspruch 1, dadurch gekennzeichnet, daß das radioaktiv machbare Element der Matrix (24) Silber ist.
4. Wärmetauscher nach Anspruch 3, dadurch gekennzeichnet, daß die Matrix (24) aus einer binären Legierung aus Silber und Kupfer gebildet ist.
5. Wärmetauscher nach Anspruch 4, dadurch gekennzeichnet, daß die Matrix (24) durch Gießen einer ternären eutektischen Legierung aus Silber, Kupfer und Cadmium in einer neutralen Atmosphäre gefertigt ist, wobei das Cadmium im Augenblick des Gießens verdampft.
6. Wärmetauscher nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß die Primärleitung (20) aus einer einen hohen Anteil an Nickel enthaltenden Legierung ist.
7. Wärmetauscher nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, daß die Sekundärleitung (22) aus rostfreiem Stahl ist.
8. Wärmetauscher nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, daß die Primärleitung die Form eines geraden Rohrs (14) hat und von einer Übergangsmatrix (18) umgeben ist, welche ihrerseits von einer ringförmigen Sekundärleitung (16) umgeben ist.
9. Wärmetauscher nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, daß die Primärleitung die Form eines geraden Rohrs (20) hat und von einer Matrix (24) umgeben ist, innerhalb welcher die die Form einer Rohrschlange (22) aufweisende Sekundärleitung angeordnet ist.
10. Wärmetauschner nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, daß die Primärleitung die Form einer Rohrschlange (26) hat und in einer Matrix (28) eingebettet ist, welche ihrerseits mit einer ringförmigen Sekundärleitung (36) in Berührung steht.
11. Wärmetauscher nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, daß die Primärleitung die Form einer Rohrschlange (46) hat und in einer Matrix (47) eingebettet ist, welche ihrerseits mit einer inneren (48) und einer äußeren (50) zylindrischen Wandung in Berührung steht, von denen die innere Wandung (48) die Matrix (47) von einem Schneckengewinde an der Außenseite eines ersten zylindrischen Körpers (49) trennt, während die äußere zylindrische Wand (50) die Innenwand eines an der Außenseite mit einem Schneckengewinde versehenen zweiten zylindrischen Körpers (51) darstellt, wobei die Sekundärflüssigkeit einerseits die vom Schneckengewinde des ersten zylindrischen Körpers (49) und der inneren Wandung (48) umgrenzten Räume und andereseits die vom Schneckengewinde des zweiten zylindrischen Körpers (51) und einer äußeren Wand (52) umgrenzten Räume durchströmt.
EP82401472A 1981-08-10 1982-08-04 Wärmetauscher mit Doppelbarriere Expired EP0072736B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8115451A FR2511139A1 (fr) 1981-08-10 1981-08-10 Echangeur de chaleur a double barriere
FR8115451 1981-08-10

Publications (2)

Publication Number Publication Date
EP0072736A1 EP0072736A1 (de) 1983-02-23
EP0072736B1 true EP0072736B1 (de) 1984-07-04

Family

ID=9261329

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82401472A Expired EP0072736B1 (de) 1981-08-10 1982-08-04 Wärmetauscher mit Doppelbarriere

Country Status (5)

Country Link
US (1) US4625789A (de)
EP (1) EP0072736B1 (de)
JP (1) JPS5837494A (de)
DE (1) DE3260330D1 (de)
FR (1) FR2511139A1 (de)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2511139A1 (fr) * 1981-08-10 1983-02-11 Commissariat Energie Atomique Echangeur de chaleur a double barriere
GB2361054B (en) * 2000-02-04 2003-11-26 Nnc Ltd Heat exchanger
US7220381B2 (en) * 2001-06-15 2007-05-22 Avure Technologies Incorporated Method for high pressure treatment of substances under controlled temperature conditions
JP3524083B2 (ja) * 2001-11-16 2004-04-26 核燃料サイクル開発機構 中間熱媒体を有するヘリカル型熱交換器
US20060205332A1 (en) * 2005-03-11 2006-09-14 Flow International Corporation Method to remove meat from crabs
ITBL20090003A1 (it) * 2009-02-04 2010-08-05 Al Ca S R L Apparecchio compatto a pompa di calore, particolarmente per riscaldare l'acqua sanitaria di uso domestico.
JP5128544B2 (ja) * 2009-04-20 2013-01-23 株式会社神戸製鋼所 プレートフィン熱交換器
AT519081B1 (de) * 2016-09-06 2018-06-15 Andritz Hydro Gmbh Verfahren zum kühlen des rotors eines elektrischen generators
GB2586145A (en) * 2019-08-07 2021-02-10 Ibj Tech Ivs Improvements in or relating to heat exchangers

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1143878A (de) * 1967-03-15
DE2105117A1 (en) * 1971-02-04 1972-08-24 Siemens Ag Burst fuel element detection - by fission product measurement
NL7106710A (en) * 1971-05-17 1972-11-21 Tracing industrial processes - by adding non-radioactive tracer and making radioactive at detection point by irradiating
US3969077A (en) * 1971-12-16 1976-07-13 Varian Associates Alkali metal leak detection method and apparatus
DE2550329A1 (de) * 1975-11-08 1977-05-18 Interatom Dreistoff-waermetauscher
GB1536291A (en) * 1976-09-09 1978-12-20 Atomic Energy Authority Uk Nuclear reactors
US4090554A (en) * 1976-11-17 1978-05-23 The Babcock & Wilcox Company Heat exchanger
DE2810699A1 (de) * 1978-03-11 1979-09-20 Interatom Lecknachweis fuer waermetauscher in kernenergieanlagen
US4249593A (en) * 1979-01-19 1981-02-10 The United States Of America As Represented By The United States Department Of Energy Heat exchanger with leak detecting double wall tubes
US4228848A (en) * 1979-01-23 1980-10-21 Grumman Energy Systems, Inc. Leak detection for coaxial heat exchange system
DE2943949A1 (de) * 1979-10-31 1981-05-27 Chemisches Laboratorium Seehof, 2244 Wesselburen Verfahren zur detektion und interpretation von leckagen aus anlagen- und rohrleitungssystemen
FR2511139A1 (fr) * 1981-08-10 1983-02-11 Commissariat Energie Atomique Echangeur de chaleur a double barriere

Also Published As

Publication number Publication date
FR2511139A1 (fr) 1983-02-11
DE3260330D1 (en) 1984-08-09
US4625789A (en) 1986-12-02
EP0072736A1 (de) 1983-02-23
FR2511139B1 (de) 1983-11-10
JPS6361599B2 (de) 1988-11-29
JPS5837494A (ja) 1983-03-04

Similar Documents

Publication Publication Date Title
EP0072736B1 (de) Wärmetauscher mit Doppelbarriere
EP0004218B1 (de) Schneller Kernreaktor mit mindestens einem Hilfs-Wärmetauscher
FR2591019A1 (fr) Dispositif auxiliaire de refroidissement pour cuve rayonnant la chaleur
EP0022714B1 (de) Mit einem Flüssigmetall gekühlter schnelle Neutronen-Kernreaktor mit einem System zum Abführen der Restwärme
FR2681976A1 (fr) Reacteur rapide refroidi au sodium.
FR2951578A1 (fr) Assemblage de combustible nucleaire et reacteur nucleaire comportant au moins un tel assemblage
FR2985842A1 (fr) Systeme pour evacuer la puissance residuelle d'un reacteur nucleaire a eau sous pression
WO2013107817A1 (fr) Système d'évacuation de la puissance résiduelle d'un réacteur nucléaire à eau sous pression
EP0057643A2 (de) Schutzeinrichtung für die Rohrplatte an der heissen Seite eines vertikaler Wärmetauschers
CH618817A5 (de)
EP0328447A1 (de) Untere Einbauten eines Kernreaktors
FR2639140A1 (fr) Reacteur nucleaire, piege a froid, et procede pour retirer les impuretes du caloporteur d'un reacteur nucleaire
EP0190075A1 (de) Dampferzeuger mit flüssigem Metall als Wärmetransportmittel und mit Leckfeststellung durch Entnahme eines solchen flüssigen Metalles
FR2686444A1 (fr) Cóoeur de reacteur creux pour utilisation dans un reacteur rapide.
EP0740767B1 (de) Wärmetauscher für kontaminierte flüssigkeit
EP0258131A1 (de) Notkühleinrichtung für schnellen Neutronenreaktor
FR2883365A1 (fr) Appareil de refroidissement cryogenique pour un autodirecteur de projectile autoguide
EP3945531B1 (de) Reaktor und sicherheitsverfahren für reaktor im falle einer kernschmelze
FR2709858A1 (fr) CÓoeur de réacteur à neutrons rapides à assemblages étanchéifiés par gaz.
FR2566914A1 (fr) Detecteur de circulation d'un fluide
EP0363247B1 (de) Vorrichtung zum Anbringen und Entfernen eines Plasmabrenners in einen Apparat, der unter einem solchen Druck und einer solchen Temperatur arbeitet, dass direktes Arbeiten unmöglich ist
EP0090743B1 (de) Schutzvorrichtung gegen Wärme und Radiation für einen in einem Kernreaktorbehälter eingetauchten Wärmeübertrager
FR2679762A1 (fr) Dispositif de securite dans un appareil de radiologie.
BE523795A (de)
FR2690002A1 (fr) Dispositif permettant de restreindre le déplacement d'un doigt de gant à l'intérieur d'un réacteur nucléaire.

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Designated state(s): BE DE GB IT NL SE

17P Request for examination filed

Effective date: 19830722

ITF It: translation for a ep patent filed

Owner name: JACOBACCI & PERANI S.P.A.

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Designated state(s): BE DE GB IT NL SE

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 19840716

Year of fee payment: 3

REF Corresponds to:

Ref document number: 3260330

Country of ref document: DE

Date of ref document: 19840809

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: SE

Payment date: 19840930

Year of fee payment: 3

Ref country code: BE

Payment date: 19840930

Year of fee payment: 3

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed
PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: NL

Payment date: 19870831

Year of fee payment: 6

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Effective date: 19890804

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SE

Effective date: 19890805

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: BE

Effective date: 19890831

BERE Be: lapsed

Owner name: COMMISSARIAT A L'ENERGIE ATOMIQUE ETABLISSEMENT D

Effective date: 19890831

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: NL

Effective date: 19900301

GBPC Gb: european patent ceased through non-payment of renewal fee
NLV4 Nl: lapsed or anulled due to non-payment of the annual fee
PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Effective date: 19900501

EUG Se: european patent has lapsed

Ref document number: 82401472.4

Effective date: 19900418