EP0108690A1 - Wärmetauscher für Fluide hoher Temperatur, wobei eines der Fluide an der Oberseite des Wärmetauschers ein- und austritt - Google Patents

Wärmetauscher für Fluide hoher Temperatur, wobei eines der Fluide an der Oberseite des Wärmetauschers ein- und austritt Download PDF

Info

Publication number
EP0108690A1
EP0108690A1 EP83402128A EP83402128A EP0108690A1 EP 0108690 A1 EP0108690 A1 EP 0108690A1 EP 83402128 A EP83402128 A EP 83402128A EP 83402128 A EP83402128 A EP 83402128A EP 0108690 A1 EP0108690 A1 EP 0108690A1
Authority
EP
European Patent Office
Prior art keywords
ferrule
exchanger
fluid
tubular plate
heat exchanger
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.)
Granted
Application number
EP83402128A
Other languages
English (en)
French (fr)
Other versions
EP0108690B1 (de
Inventor
Jean-Louis Pierrey
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.)
Novatome SA
Original Assignee
Novatome SA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Novatome SA filed Critical Novatome SA
Publication of EP0108690A1 publication Critical patent/EP0108690A1/de
Application granted granted Critical
Publication of EP0108690B1 publication Critical patent/EP0108690B1/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
    • F28D1/00—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators
    • F28D1/02—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid
    • F28D1/0206—Heat exchangers immersed in a large body of liquid
    • F28D1/0213—Heat exchangers immersed in a large body of liquid for heating or cooling a liquid in a tank
    • 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 a heat exchanger with two fluids, one of the fluids of which enters the exchanger and exits from this exchanger through its upper part.
  • Such exchangers are used, for example, in integrated-type fast neutron nuclear reactors where the heat released by the reactor core is removed using primary sodium contained in the reactor vessel and into which the core of the reactor is immersed. reactor.
  • the heat is transmitted to the steam generator via secondary sodium which is heated by the primary sodium in heat exchangers immersed in the primary sodium filling the tank called intermediate heat exchangers.
  • Secondary sodium enters these intermediate exchangers through their upper part, above the slab closing the reactor vessel, and must likewise exit from the intermediate heat exchanger - through its upper part, above the slab.
  • Such heat exchangers comprise a tubular bundle of annular shape and with vertical straight tubes in which the secondary sodium is caused to flow from bottom to top.
  • the tube bundle has two annular tube plates at its lower part and at its upper part respectively.
  • the secondary sodium is brought under the lower tubular plate to be circulated in the tubes of the bundle, by a central vertical duct crossing the exchanger over its entire height and connected at its upper part to a secondary sodium inlet duct.
  • the secondary sodium enters an annular duct arranged coaxially with respect to the inlet duct of the secondary sodium and also opening at the upper part of the exchanger.
  • the tube bundle is immersed in the primary sodium which is circulated in contact with the outside surface of the tubes of the bundle by means of circulation pumps immersed in the primary sodium contained in the reactor vessel.
  • the secondary sodium supply conduit under the lower plate of the tube bundle is constituted by a cylindrical double wall with vertical axis also constituting the internal wall of the tube bundle.
  • This double cylindrical wall is constituted by a first ferrule welded to the two tabular plates of the bundle, along their internal edges and extended upwards to the upper level of the exchanger and by a second cylindrical ferrule coaxial with the first fixed to the plaque lower of the tube bundle along its internal edge and connected at its upper part to the secondary sodium inlet duct.
  • This second ferrule is disposed inside the first, the two ferrules being connected at their upper part by a tight expansion joint making it possible to establish a gaseous atmosphere of thermal insulation (for example argon) in the annular space between the two ferrules constituting the internal wall of the tube bundle and the secondary sodium inlet duct.
  • This gaseous layer also makes it possible to thermally isolate the secondary sodium entering the heat exchanger from the heated secondary sodium leaving the tube bundle.
  • the outer shell of the secondary sodium supply duct which is welded to both the lower tube plate and the upper tube plate of the bundle is very highly stressed.
  • the assembly constituted by this ferrule, the bundle tubes and the tubular plates is. indeed monobloc and hyperstatic.
  • the different elements for example the ferrule and the tubes of the bundle, have very different rigidities.
  • the heat exchanger therefore undergoes significant differential expansion and deformation in its central part comprising the internal wall of the tube bundle.
  • the object of the invention is therefore to propose a heat exchanger for fluids at high temperature one of which, or first fluid, enters the exchanger at its upper part, circulates from bottom to top inside the exchanger in the straight vertical tubes of a ring-shaped bundle with a vertical axis comprising a lower tubular plate and an annular upper tubular plate as well as a central cylindrical internal wall coaxial with the bundle, serving as a conduit for the first fluid under the lower tubular plate and finally, leaves the exchanger at its upper part, via an annular outlet duct coaxial with the fluid supply duct and thermally insulated from it, the second fluid circulating in contact with the external surface of the tubes of the bundle, this heat exchanger not undergoing excessive thermal or mechanical stresses, in its central part comprising the internal wall of the tube bundle.
  • Figure 1 shows, in a sectional view through a vertical plane, an intermediate heat exchanger according to the prior art.
  • FIG. 2 represents, in a half-view in section through a vertical plane of symmetry, a heat exchanger according to the invention.
  • the lower part of the exchanger comprising a tube bundle 5 plunges under the upper level 4 of the liquid sodium filling the tank and constituting the primary fluid of the reactor.
  • This primary fluid is circulated by pumps plunging into the tank so that it enters through the inlet window 6 of the heat exchanger, at its outlet from the core.
  • the primary sodium circulates in contact with the tubes of the bundle 5 to exit through the outlet window 7 of the heat exchanger. Between the windows 6 and 7, the tubular bundle is surrounded by a cylindrical envelope 8.
  • the tube bundle comprises two tube plates, a lower tube plate 9 and an upper tube plate 10.
  • a secondary sodium inlet chamber 12 into which the sodium 14 feed duct opens.
  • the duct 14 consists of a double wall formed by two vertical coaxial ferrules 15 and 16.
  • the outer shell 15 of this wall is fixed by welding to the lower plate 9 and to the upper plate 10 of the tube bundle.
  • the secondary sodium heated by the primary sodium enters an annular outlet conduit 20 coaxial with the ferrules 15 and 16.
  • the outer ferrule of the conduit 20 is connected at its upper part to the ferrules 15 and 16 by l 'through expansion joints 21 and 22.
  • annular chamber is delimited by the ferrules 15 and 16 and this annular chamber is filled with a neutral gas ensuring thermal insulation between the cold secondary sodium arriving via the conduit 14 and the hot secondary sodium leaving via the annular conduit 20.
  • the conduit 20 is connected to a pipe 24 bringing the hot sodium to the steam generator.
  • the assembly formed by the plates 9 and 10, the tubular exchanger 5 and the internal ferrule 15 thereof is extremely rigid, the straight tubes of the bundle being welded to the tubular plates 9 and 10 and the ferrule 15 being welded to these two tubular plates 9 and 10.
  • This high rigidity is due in particular to the fact that the tubes of the bundle are rights and many.
  • the lower part of the heat exchanger immersed in the primary liquid sodium comprises a tube bundle 35, the primary liquid sodium circulating between the inlet window 36 and the outlet window 37 of the heat exchanger in contact with the surface beam tubes 35.
  • the tubes of this bundle arranged vertically are straight and fixed at their lower end in a tubular plate 39 and at their upper part in a tubular plate 40.
  • a chamber 42 into which the cold secondary sodium arrives and serving for its distribution in the tubes of the bundle 35.
  • the cold secondary sodium is brought into the chamber 42 by a vertical central duct 44 which limits the internal part of the tubular bundle 35 and by its extension.
  • This wall consists of three vertical and coaxial cylindrical ferrules.
  • the first innermost ferrule 45 is welded by its lower edge along the internal edge of the annular lower tubular plate 39.
  • the upper part of the ferrule 45 is connected to a conduit 48 for the secondary sodium, constituting the first fluid, in the heat exchanger.
  • the second ferrule 46 disposed outside of the ferrule 45 is welded by its inner edge to the lower tubular plate 39 and its upper part is at the level of the upper part of the heat exchanger.
  • the ferrules 45 and 46 are only integral with the lower tubular plate 39.
  • the third ferrule 47 is welded to the upper tube plate 40, along the inner edge of this tube plate. This ferrule 47 is extended downward to a level located between the two tubular plates 39 and 40, in the vicinity of the middle part of the tubular bundle 35. The upper part of the third ferrule 47 is at the level of the upper part of the heat exchanger.
  • the ferrule 47 is connected by a gas tight expansion joint 50 to the upper part of the ferrule 45. This ferrule 47 is also connected by a gas tight expansion joint 52 to the upper part of the second ferrule 46.
  • the secondary sodium constituting the first fluid circulating in the heat exchanger, enters an annular conduit 60 coaxial with the ferrules 45, 46 and 47 and connected at its upper part to a conduit 64 towards the steam generator.
  • the secondary sodium heated by the primary sodium constituting the second fluid of the exchanger is isolated in the conduit 60 from the cold secondary sodium arriving via the central part of the exchanger in the chamber 42, by a double gaseous layer.
  • annular chamber 54 gas tight between the ferrules 45 and 46 and the annular chamber 55 between the ferrules 46 and 47 are filled with neutral gas, over the entire length of the conduit 60.
  • the neutral gas filling the chamber 54 is introduced into this chamber where it remains trapped after the flexible seal 50 is closed.
  • the chamber 55 is connected at its upper part to a circuit 56 for supplying neutral gas at a regulated pressure.
  • the lower part of the annular chamber 54 opens into the primary sodium constituting the second fluid of the circulating heat exchanger in contact with the external surface of the tubes 35 of the bundle.
  • the pressure of the neutral gas (for example argon) sent into the chamber 54 by the regulated circuit 56 makes it possible to maintain the level 59 of separation between the neutral gas and the primary sodium under the tube plate 40.
  • the device according to the invention has the main advantage of comprising an internal wall of the tubular bundle also constituting the secondary sodium inlet conduit in the exchanger, formed of three ferrules, none of which is welded to both two plates you beam beams and which form thermal insulation chambers between them filled with neutral gas. These ferrules are only subjected to low stresses during the use of the intermediate exchanger, which increases the operational reliability of the heat exchanger and can allow its design to be simplified.
  • the three ferrules constituting the internal wall of the bundle can expand independently of each other, since their upper parts are connected by expansion joints, such as bellows.
  • the invention is not limited to the embodiment; on the contrary, it includes all its variants.
  • ferrules can be connected to their upper part so as to allow differential expansions, in a different way and by using expansion devices of a different type of bellows.
  • the diameter of the different ferrules may also not be constant over their entire height.
  • the third ferrule can be extended downwards to any height between the two tube plates of the bundle.
  • the chamber between the second and third ferrules can be connected to any neutral gas circuit allowing regulation of the pressure of this neutral gas as a function of the pressure of the primary sodium in the tube bundle.
  • the invention applies to any type of intermediate heat exchangers of a fast neutron nuclear reactor cooled by any fluid.
  • the invention applies to intermediate reactor integrated exchangers or to fast loop type neutron reactor exchangers then placed in tanks external to the tank.
  • the invention applies to any large-sized heat exchanger whose first fluid enters and leaves the exchanger through its upper part.

Landscapes

  • 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)
  • Details Of Heat-Exchange And Heat-Transfer (AREA)
EP83402128A 1982-11-05 1983-11-02 Wärmetauscher für Fluide hoher Temperatur, wobei eines der Fluide an der Oberseite des Wärmetauschers ein- und austritt Expired EP0108690B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8218571 1982-11-05
FR8218571A FR2535836A1 (fr) 1982-11-05 1982-11-05 Echangeur de chaleur pour fluides a temperature elevee dont l'un des fluides entre et sort par la partie superieure de l'echangeur

Publications (2)

Publication Number Publication Date
EP0108690A1 true EP0108690A1 (de) 1984-05-16
EP0108690B1 EP0108690B1 (de) 1985-07-31

Family

ID=9278931

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83402128A Expired EP0108690B1 (de) 1982-11-05 1983-11-02 Wärmetauscher für Fluide hoher Temperatur, wobei eines der Fluide an der Oberseite des Wärmetauschers ein- und austritt

Country Status (5)

Country Link
US (1) US4585058A (de)
EP (1) EP0108690B1 (de)
JP (1) JPS59107187A (de)
DE (1) DE3360473D1 (de)
FR (1) FR2535836A1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2693309A1 (fr) * 1992-07-01 1994-01-07 Framatome Sa Procédé et dispositif d'évacuation de la puissance résiduelle d'un réacteur nucléaire à neurton rapides à l'arrêt.

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4855947A (en) * 1987-05-27 1989-08-08 Amdahl Corporation Microprogrammable pipeline interlocks based on the validity of pipeline states
US5004047A (en) * 1989-06-14 1991-04-02 Carrier Corporation Header for a tube-in-tube heat exchanger
US5272739A (en) * 1991-06-06 1993-12-21 Westinghouse Electric Corp. Method of eliminating heat exchanger tube vibration and self-preloading heat exchanger tube support for implementing same
US8047388B2 (en) * 2008-12-08 2011-11-01 Graham Packaging Company, L.P. Plastic container having a deep-inset base

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2385067A1 (fr) * 1977-03-21 1978-10-20 Commissariat Energie Atomique Echangeur thermique annulaire
EP0012691A1 (de) * 1978-12-12 1980-06-25 Novatome Verbesserungen an einem Wärmetauscher
FR2452687A1 (fr) * 1979-03-28 1980-10-24 Stein Industrie Echangeur de chaleur a zone centrale avec conduits coaxiaux et zone d'echange peripherique
EP0041452A2 (de) * 1980-06-02 1981-12-09 STEIN INDUSTRIE Société anonyme dite: Vorrichtung zum Verringern der thermischen Spannung in Wärmetauschern

Family Cites Families (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3126949A (en) * 1964-03-31 Heat exchanger construction
BE568855A (de) * 1957-06-24 1900-01-01
US3187807A (en) * 1961-05-03 1965-06-08 Babcock & Wilcox Co Heat exchanger
US3520356A (en) * 1966-09-22 1970-07-14 Atomic Energy Commission Vapor generator for use in a nuclear reactor
US3490521A (en) * 1968-03-12 1970-01-20 Westinghouse Electric Corp Tube and shell heat exchanger
US3776302A (en) * 1972-02-14 1973-12-04 Westinghouse Electric Corp Tube and shell heat exchanger
US3805890A (en) * 1972-12-12 1974-04-23 Atomic Energy Commission Helical coil heat exchanger
US3868994A (en) * 1973-02-26 1975-03-04 Atomic Energy Commission Liquid metal operated heat exchanger
GB1447051A (en) * 1973-04-16 1976-08-25 Atomic Energy Authority Uk Tube-in-shell heat exchangers
US3907026A (en) * 1973-08-21 1975-09-23 Westinghouse Electric Corp Double tube heat exchanger
US4088182A (en) * 1974-05-29 1978-05-09 The United States Of America As Represented By The United States Department Of Energy Temperature control system for a J-module heat exchanger
JPS54357A (en) * 1977-06-02 1979-01-05 Yoshimitsu Nakanishi Automatic transportation device of plateelike article
DE2846581A1 (de) * 1978-10-26 1980-05-08 Ght Hochtemperaturreak Tech Waermetauscher fuer gase von hoher temperatur
FR2458131A1 (fr) * 1979-05-31 1980-12-26 Commissariat Energie Atomique Echangeur intermediaire de chaleur pour reacteur nucleaire

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2385067A1 (fr) * 1977-03-21 1978-10-20 Commissariat Energie Atomique Echangeur thermique annulaire
EP0012691A1 (de) * 1978-12-12 1980-06-25 Novatome Verbesserungen an einem Wärmetauscher
FR2452687A1 (fr) * 1979-03-28 1980-10-24 Stein Industrie Echangeur de chaleur a zone centrale avec conduits coaxiaux et zone d'echange peripherique
EP0041452A2 (de) * 1980-06-02 1981-12-09 STEIN INDUSTRIE Société anonyme dite: Vorrichtung zum Verringern der thermischen Spannung in Wärmetauschern

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2693309A1 (fr) * 1992-07-01 1994-01-07 Framatome Sa Procédé et dispositif d'évacuation de la puissance résiduelle d'un réacteur nucléaire à neurton rapides à l'arrêt.
US5392324A (en) * 1992-07-01 1995-02-21 Framatome Device for and method of removing the residual power from a fast-neutron nuclear reactor at shutdown

Also Published As

Publication number Publication date
DE3360473D1 (en) 1985-09-05
FR2535836A1 (fr) 1984-05-11
FR2535836B1 (de) 1985-01-18
US4585058A (en) 1986-04-29
JPS59107187A (ja) 1984-06-21
EP0108690B1 (de) 1985-07-31

Similar Documents

Publication Publication Date Title
EP0108690B1 (de) Wärmetauscher für Fluide hoher Temperatur, wobei eines der Fluide an der Oberseite des Wärmetauschers ein- und austritt
EP0163564B1 (de) Schneller Neutronenkernreaktor mit Dampferzeuger, integriert im Behälter
EP0012691A1 (de) Verbesserungen an einem Wärmetauscher
EP0020265B1 (de) Wärmeaustauscher für Kernreaktor
EP0117191B1 (de) Dampferzeuger für einen flüssigmetallgekühlten nuklearen Reaktor
EP0190075B1 (de) Dampferzeuger mit flüssigem Metall als Wärmetransportmittel und mit Leckfeststellung durch Entnahme eines solchen flüssigen Metalles
EP0018262B1 (de) Schneller Kernreaktor mit einem zylindrischen Innenbehälter
FR2535510A1 (fr) Dispositif de purification du metal liquide de refroidissement d'un reacteur nucleaire a neutrons rapides
EP0470893A1 (de) Verfahren zum Stopfen eines Wärmetauscherrohres mit geraden Röhren und Verwendung dieses Verfahrens
EP0064920B1 (de) Vorrichtung zur Dampferzeugung und zur Ableitung von Wärme in einem schnellen Brüter
EP0206921B1 (de) Wärmetauscher mit koaxialen U-Rohren und Zwischenkreislauf von neutralem Gas und schneller Neutronenreaktor mit solchem Wärmetauscher
EP0258131A1 (de) Notkühleinrichtung für schnellen Neutronenreaktor
FR2693309A1 (fr) Procédé et dispositif d'évacuation de la puissance résiduelle d'un réacteur nucléaire à neurton rapides à l'arrêt.
EP0144256B1 (de) Anordnung zur thermischen Abschirmung einer Komponente eines Kernreaktors mit schnellen Neutronen
EP0039290B1 (de) Spannungsreduziervorrichtung im Boden eines senkrechten Wärmetauschers
EP0184488B1 (de) Integrierte Reinigungsvorrichtung für Flüssigmetallkühlmittel eines schnellen Neutronenreaktors
EP0089869A1 (de) Von flüssigem Metall beheizter Dampferzeuger mit mehreren Flüssigmetall-Neutralgas Trennflächen
FR2555794A1 (fr) Reacteur nucleaire a neutrons rapides equipe de moyens de refroidissement de secours
FR2505078A1 (fr) Dispositif de refroidissement de la cuve principale d'un reacteur nucleaire a neutrons rapides
EP0090743B1 (de) Schutzvorrichtung gegen Wärme und Radiation für einen in einem Kernreaktorbehälter eingetauchten Wärmeübertrager
FR2518707A1 (fr) Dispositif de production de vapeur par echange de chaleur entre un metal liquide caloporteur et de l'eau alimentaire
EP0612076A1 (de) Einheit einer modularen Wand für den Gehäusedeckel eines Behälters, insbesondere für den Behälterdeckel eines Kernreaktors
EP1103774A1 (de) Plattenwärmetauscher in einem unter Druck stehendem Gehäuse
FR2683897A1 (fr) Echangeur de chaleur a tubes droits perfectionne dans lequel circule un fluide a temperature elevee et variable.
FR2713752A1 (fr) Echangeur de chaleur à fluide intermédiaire diphasique.

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 LU NL

17P Request for examination filed

Effective date: 19840612

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 LU NL

REF Corresponds to:

Ref document number: 3360473

Country of ref document: DE

Date of ref document: 19850905

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

Ref country code: LU

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 19851130

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: GB

Payment date: 19891031

Year of fee payment: 7

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

Ref country code: DE

Payment date: 19891113

Year of fee payment: 7

ITTA It: last paid annual fee
PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: NL

Payment date: 19891130

Year of fee payment: 7

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

Ref country code: BE

Payment date: 19891212

Year of fee payment: 7

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

Ref country code: GB

Effective date: 19901102

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

Ref country code: BE

Effective date: 19901130

BERE Be: lapsed

Owner name: NOVATOME

Effective date: 19901130

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

Ref country code: NL

Effective date: 19910601

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: 19910801