EP0091374B1 - Behelfsabsperreinrichtung für ein Dampferzeugerrohr im Falle eines Lecks - Google Patents

Behelfsabsperreinrichtung für ein Dampferzeugerrohr im Falle eines Lecks Download PDF

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Publication number
EP0091374B1
EP0091374B1 EP83400684A EP83400684A EP0091374B1 EP 0091374 B1 EP0091374 B1 EP 0091374B1 EP 83400684 A EP83400684 A EP 83400684A EP 83400684 A EP83400684 A EP 83400684A EP 0091374 B1 EP0091374 B1 EP 0091374B1
Authority
EP
European Patent Office
Prior art keywords
tube
bush
steam
water
collector
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
EP83400684A
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English (en)
French (fr)
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EP0091374A1 (de
Inventor
Claude Malaval
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 EP0091374A1 publication Critical patent/EP0091374A1/de
Application granted granted Critical
Publication of EP0091374B1 publication Critical patent/EP0091374B1/de
Expired legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F11/00—Arrangements for sealing leaky tubes and conduits
    • F28F11/06—Arrangements for sealing leaky tubes and conduits using automatic tube obturating appliances
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
    • F22B1/00—Methods of steam generation characterised by form of heating method
    • F22B1/02—Methods of steam generation characterised by form of heating method by exploitation of the heat content of hot heat carriers
    • F22B1/06—Methods of steam generation characterised by form of heating method by exploitation of the heat content of hot heat carriers the heat carrier being molten; Use of molten metal, e.g. zinc, as heat transfer medium
    • F22B1/063—Methods of steam generation characterised by form of heating method by exploitation of the heat content of hot heat carriers the heat carrier being molten; Use of molten metal, e.g. zinc, as heat transfer medium for metal cooled nuclear reactors

Definitions

  • the invention relates to an emergency shut-off device, in the event of a leak, of a tube of a steam generator comprising an envelope containing a tubular bundle, inside which a liquid metal circulates in contact with the surface. beam tubes.
  • Such steam generators where the heat of vaporization is supplied to the drinking water by a liquid metal, for example liquid sodium, are used in fast neutron nuclear reactors, the liquid metal itself being heated by another metal liquid cooling the reactor core.
  • a liquid metal for example liquid sodium
  • the hot liquid sodium is generally brought to the upper part of the envelope of the steam generator and flows vertically through the tube bundle.
  • Each of the bundle tubes is connected at one end to a water supply device and at its other end to a collector collecting the vapor formed in the tube by heat exchange between liquid sodium and drinking water flowing through the tube.
  • the water supply device and the vapor collector can be constituted by several cylindrical boxes or by O-pipes.
  • toric conduits it is known, for example from French patent 2,449,260, to have a T-connector on each of the tubes, in its terminal part, in the vicinity of its connection point with the toric pipe.
  • a T-connector allows, in particular, to have access to the inner part of the tubes, to carry out checks or measurements.
  • the first effect in the very short term, leads to the propagation, at the speed of sound, through the steam generator and the pipes of the secondary circuit, of a pressure wave.
  • the pressure wave attenuates when it meets such free surfaces.
  • a pipe normally closed by a rupture membrane and communicating with one or more tanks for rapid drainage of sodium and the products of the sodium-water reaction.
  • the drain rate may become insufficient to avoid a pressure rise in the steam generator and the secondary circuit.
  • the alarm signals generated at the time of the appearance of the leak on the generator tube bundle control rapid steam decompression valves as well as valves for shutting off the steam generator water supply flow.
  • the object of the invention is therefore to propose an emergency closure device in the event of a leak from a tube of a steam generator comprising an envelope containing a tubular bundle, inside which a liquid metal circulates in contact with the external surface of the bundle tubes and brings the heat of vaporization to the food water circulating in each of the tubes, the two end parts of which pass through the envelope and are connected, one to a water supply device and the other to a collector collecting the vapor formed in the tube, arranged outside the envelope, this sealing device having to prevent the introduction into the liquid metal of a large quantity of water, if a steam generator tube leaks or breaks.
  • the casing 1 contains a tubular bundle 5 consisting of tubes 6 of great length wound in a helix and held in position in the casing by retaining grids 8 and 9.
  • the tubes 6 pass through the casing 1 of the steam generator its upper part and its lower part; the end portions of each of the tubes 6 are engaged, for this purpose, in thermal sleeves fixed in the casing 1.
  • the set of tubes of the bundle is divided into four sub-assemblies comprising the same number of tubes and in which the tubes 6 are connected to the same water box and to the same vapor collector, by their end portions.
  • Each of the four water boxes 10a, 10b, 10c and 10d of cylindrical shape is connected by its side wall to a water supply pipe 12.
  • the tubes 6 of the subassembly connected to the water box are connected to this one. ci by its flat upper wall constituting a tubular plate.
  • the collectors 11 are connected two by two to steam evacuation pipes 14.
  • the water flowing from bottom to top in the bundle is therefore heated by the hot liquid sodium flowing from top to bottom in contact with the outside surface of the bundle tubes.
  • FIGS. 2a, 2b, ⁇ 2c the flat upper wall 15 of the water box 10 is seen constituting a tubular plate in which the lower ends of the tubes 6 are fixed at the level of bores 16 machined in the tubular plate 15.
  • this bore 17 is tapped over at least part of its height and a threaded sleeve 18 is fixed by screwing inside this bore 17.
  • the sleeve 18 is also held inside the water box thanks to screws 21 and centered inside the water box thanks to corners 22 of trapezoidal shape.
  • the socket can be fixed to the plate 29 by welding after installation.
  • the tubular sleeve 18 has an inner bore 24 of larger diameter than the bore 16 into which is inserted the tube 6.
  • the bores 24 and 16 are connected by a passage 25 having frustoconical bearing surfaces.
  • valve 26 Inside the bore 24 is placed a valve 26 having two conical ends connecting to a prismatic central part with triangular section as shown in FIG. 2b.
  • the valve 26 is centered inside the bore 24 by the edges of the prism constituting its central part.
  • valve 26 The lower end of the valve 26 is secured to a rod 27 arranged along the axis of the bore 24. At its lower part the rod 27 is secured to a fixing bar 28 engaged in lateral openings 30 passing through the surface side of socket 18.
  • the valve 26 is thus held in position as shown in FIG. 2a, thanks to the rod 27.
  • the water brought into the water box feeds each of the tubes 6 connected to this water box after passing through the bore 24 of the sockets 18 in the direction indicated by the arrows 32.
  • the water can indeed reach the bore 16 inside which the tube 6 is placed, passing around the prismatic body and the conical ends of the valve 26.
  • the rod 27 has sufficient strength to hold the valve despite the vertical force directed towards the top exerted by the circulating food water, when the flow rate of this food water corresponds to the normal supply flow rate of the tubes 6, during the operation of the steam generator.
  • valve 26 moves upwards and obstructs the passage 25 in which it is maintained by the pressurized water filling the interior volume of the water box. The water supply to tube 6 is then cut.
  • FIG. 3a we see the flat upper plate 35 of a manifold 11 pierced with a bore 36 in which the upper end of the tube 6 is fixed.
  • a socket 38 is screwed inside a bore 37 of larger diameter than the bore 36.
  • the internal bore 34 of the bush 38 of larger diameter than the bore 36 is connected to the latter by a frustoconical bearing 40.
  • the side wall of the sleeve 38 is pierced with openings 41 for the outlet of the steam (arrows 42).
  • the lower part of the socket 38 is closed by a wall 43 pierced with a hole 44. On this wall 43 rests a valve 45 closing the opening 44 and entirely disposed below the openings 41.
  • the valve 45 interposed between the openings 44 on the one hand and 41 on the other hand, has two conical ends and a cylindrical central part.
  • the steam arriving in the tube 6 passes into the interior chamber of the manifold 11 via the bore 34 and the openings 41.
  • the valve 45 remains in the centered position inside the lower part of the socket 38 and closes the opening 44.
  • the valve is propelled to the upper part of the socket 38 and obstructs the passage 40 where it is maintained by the pressure of the vapor in the manifold 11.
  • the closure device according to the invention therefore makes it possible to obtain a complete single image of this tube 6 as well with respect to the water box as relative to the vapor collector.
  • valves 26 and 45 are held in the closed position by the pressurized water from the water box and by the pressurized steam from the manifold. This avoids the sending inside the liquid sodium filling the envelope of the steam generator of large quantities of water, the period of time elapsing between the appearance of the rupture and the closure of the tube by the valves being extremely brief.
  • FIG. 4 we see a steam generator which comprises, like the steam generator shown in FIG. 1, an envelope 51, hot sodium inlets 52 and 53 and a tubular bundle 55.
  • the bundle 55 is constituted by tubes 56, the lower and upper end portions of which pass through the casing 51 in thermal sleeves 57.
  • the end portions are connected to a water supply toroid 58 and a vapor collector toroid 59, respectively.
  • the toroids 58 and 59 are arranged outside of the envelope 51 and coaxially with it.
  • the vapor collector core 59 is further connected to a larger diameter core 60 collecting the vapor before its transport to the turbine powered by the steam generator.
  • FIG. 5 we see the T-connector 64 of the end part of a tube 56 connected to the water supply toroid 58.
  • This terminal part comprises the sleeve 57, the connector 64 and the part of the tube 56b welded on the feed toroid 58.
  • the sleeve 57 is welded on the one hand to the casing 51 by its part 57a and on the other hand to the fitting 64 and to the part of the tube 56a disposed in the casing 51, by its part 57b.
  • the connector 64 has an opening 66 closed by a plug 67 fixed on the connector 64, in a removable manner, by means of a nut 69 screwed onto a threaded part of the connector 64.
  • the opening 66 allows access to the inlet of the tube 66 in the steam generator.
  • the connector 64 also includes a branch 64b perpendicular to the branch 64a extending the part 57b of the sleeve 57 and connected by welding to the part 56b of the tube 56.
  • the socket 68 of the closure device similar to the device shown in FIGS. 2a, 2b and 2c is fixed to the plug 67 with which it can be mounted on the fitting 64.
  • This socket 68 has an outside diameter smaller than the inside diameter of the branch 64a of the fitting.
  • At its anterior end, it has a calibrated opening 70 delimited by two frustoconical bearing surfaces 70a and 70b, making the bore of the sleeve communicate with the sleeve 57 and the part 56a of the tube 56 inside the envelope 51 of the steam generator.
  • the socket 68 also has openings 71 in its side wall, facing the branch 64b.
  • the front end of the socket 68 is engaged without play in the connection portion 64 ensuring attachment to the part 57b of the sleeve 57.
  • the water coming from the supply torus 58 through the tube 56b and the branch 64b therefore crosses the fitting 64, inside the socket 68 interposed on its course.
  • a valve 76 is mounted integral with a breaking rod 77 fixed on the plug 67.
  • the valve 76 has the same shape as the valve 26 shown in Figures 2a, 2b and 2c.
  • the rod 77 has sufficient strength to maintain the valve 76 against the force exerted by the drinking water at its normal flow rate. In the event of a leak, the increased flow of drinking water causes the rod 77 to rupture and the valve 76 to be driven into the closed position of the opening 70a-70.
  • the connector 65 has an opening 86 in the extension of the part 57b of the sleeve 57 and of the vapor outlet of the tube 56a disposed in the envelope 51.
  • the opening 86 is closed by a plug 79 forming a nut and tightening a seal 80 to prevent the outlet of superheated steam under pressure.
  • the front part of the fitting 65 welded to the part 57b of the sleeve 57 has a diameter less than the inside diameter of the branch 65a of the fitting.
  • a frustoconical bearing 84 provides the junction between these two parts of the connector.
  • a socket 78 is screwed, by its tapped end 84 onto the plug 79.
  • the socket has a front opening 83 for the arrival of steam communicating with the outlet 57b of the sleeve 57 and of the tube 56a via the conical bearing 84.
  • the side wall the socket 78 is pierced with openings 82 in front of the branch 65b and 81 in the vicinity of the plug 79, at the rear of the branch 65a.
  • a valve 85 similar to the valve 45 shown in Figures 3a and 3b is arranged free and movable in the bore of the sleeve 78. This valve 85 is between the openings 81 and 82 in the position shown in Figure 6 which corresponds to the valve opening 85.
  • the front part of the socket 78 engages without play in the branch 65a in the vicinity of the range 84.
  • the superheated steam arriving through the tube 56a therefore enters the socket 78 which is interposed on its path, to exit through the openings 82 , before traversing the tube 56b to the vapor collector 59.
  • the device In the event of a leak on a tube 56, the device therefore allows immediate and automatic sealing of this tube.
  • the main advantages of the device according to the invention are to avoid the introduction of water into the secondary circuit of the nuclear reactor, in case of rupture of a tube of the bundle of the steam generator, by using extremely simple devices and requiring no control means and no monitoring device.
  • valves with free movement arranged in the internal bore of the sockets associated with the vapor collector, one can imagine the use of valves with return device.
  • closure device which has just been described relates to a single tube but that each of the tubes of the bundle is equipped with a similar device comprising closure means at each of its ends.
  • the emergency shutter device applies whatever the number of water boxes and the number of steam collectors associated with the steam generator. It also applies in the case of all toroidal collectors or of another form to which the end parts of the tubes are connected.
  • the device also applies to the case of steam generators comprising a device for supplying or recovering steam in the form of a box, for example cylindrical, and a device for recovering steam or supplying water, respectively , in the form of an O-ring.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • High Energy & Nuclear Physics (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Monitoring And Testing Of Nuclear Reactors (AREA)
  • Structure Of Emergency Protection For Nuclear Reactors (AREA)
  • Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)
  • Motor Or Generator Cooling System (AREA)
  • Feeding And Controlling Fuel (AREA)

Claims (6)

1. Vorrichtung zur Notabsperrung im Fall eines Lecks in einem Rohr (6, 56) eines Dampferzeugers, der einen, ein Rohrbündel (5, 55) umschließenden Mantel (1, 51) aufweist, in dessen Innerem ein flüssiges Metall in Kontakt mit den Außenflächen der Rohre des Bündels (6, 56) zirkuliert und die Verdampfungswärme auf das in jedem der Rohre (6, 56) zirkulierende Speisewasser überträgt, deren beiden Endstücke den Mantel (1. 51) durchqueren, wobei ein Endstück an eine Wasserversorgungsvorrichtung (10, 58) und das andere an einen Sammler (11, 59) zum Sammeln des im Rohr (6, 56) erzeugten Dampfes angeschlossen ist und wobei die Wasserversorgungsvorrichtung und der Sammler außerhalb des Mantels (1, 51) angeordnet sind, gekennzeichnet durch eine rohrförmige Hülse (18, 68), die auf dem mit der Wasserversorgungsvorrichtung (10, 58) verbundenen Endstück des Rohrs (6, 56) in den Speisewasserkreis zwischen der Wasserversorgungsvorrichtung (10, 58) und dem in den Mantel (1, 51) führenden Bereich des Rohrs (6, 56) eingeschaltet ist, die Wasser-Ein-und -Austrittsöffnungen (25, 70, 71) aufweist und eine Klappe (26, 76) umschließt, die mit der Hülse (18, 68) über ein Stück (27, 77) verbunden ist, das im Fall eines Lecks im Rohr (6, 56), das zu einem gesteigerten Wasserdurchsatz durch die Hülse (18, 68) führt, abbrechen kann, wodurch die Klappe (26, 76) in Schließstellung des Speisewasseraustritts (25, 70) der Hülse (18, 68) geführt wird, und eine zweite rohrförmige Hülse (38, 78), die auf dem mit dem Dampfsammler (11, 59) verbunden Endstück des Rohrs (6, 56) in den Dampfkreis zwischen dem Mantel (1, 51) des Dampferzeugers und dem Dampfsammler (11, 59) eingeschaltet ist, die Dampf-Ein- und -Austrittsöffnungen (40, 41, 82, 83) aufweist und eine lose Klappe (45, 85) umschließt, in die der Bogen der Hülse (38, 78) zwischen einer Öffnungsstellung, in der die Klappe (45, 85) zwischen der Austrittsöffnung (41, 82) und einer mit dem Dampfsammler (11, 59) verbundenen, der Eintrittsöffnung (40, 83) gegenüberlegenden Dampfdurchgangsöffnung und einer Schließstellung der Dampfeintrittsöffnung der Hülse (38, 78) durch Verschiebung unter Einwirkung der zwischen dem Innenvolumen des Dampfsammlers (11, 59) und dem Inneren der Hülse (38, 78) im Fall eines Lecks im Rohr (6, 56) auftretenden Druckdifferenz, beweglich ist.
2. Vorrichtung nach Anspruch 1, bei der die Wasserversorgungsvorrichtung (10) und der Sammler (11) Kästen sind, dadurch gekennzeichnet, daß die Hülsen (18, 38) an der Wandung des das Rohr (6) aufnehmenden Kastens befestigt sind, so daß die Bohrung (24, 34) der Hülse mit einem ihrer Enden mit einer in der Wandung angebrachten Bohrung (16, 36), die das Ende des Rohrs (6) aufnimmt und mit ihrem anderen Ende mit dem Innenvolumen des Kastens in Verbindung steht.
3. Vorrichtung nach Anspruch 1, bei der die Wasserversorgungsvorrichtung (58) und der Sammler (59) aus spiralförmigen Leitungen bestehen, wobei jedes Rohr (56) an seinen Enden mit den spiralförmigen Leitungen verbunden ist und an jedems seiner Enden ein T-Verbindungsstück (64, 65) aufweist, dadurch gekennzeichnet, daß die Hülse (68, 78) an jedem Endstück des Rohrs (56) in einem der Zweige des T-Verbindungsstücks angeordnet ist.
4. Vorrichtung nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß die im Inneren der mit dem Endstück des an der Wasserversorgungsvorrichtung (10, 58) angesclossenen Rohrs verbundene Hülse (18, 68) ein konisches Absperrende und einen prismenförmien Führungsbereich in der Bohrung der Hülse aufweist und daß die Klappe (26, 76) an ihrem dem Absperrende gegenüberliegenden Ende mit dem längs der Bohrungsachse der Hülse (18, 68) angeordneten abbrechbaren Stück (27, 77) verbunden ist, das mit seinem dem mit der Klappe (26, 76) verbundenen Ende gegenüberliegenden Ende mit der Hülse (18, 68) verbunden ist.
5. Vorrichtung nach Anspruch 2, dadurch gekennzeichnet, daß die mit dem Wasserkasten verbundene Hülse (18) in diesem an ihrem, dem an der Wandung des Wasserkasten befestigten Ende gegenüber liegenden Ende mit einer Halterungsplatte (20) in Position gehalten wird, in die Öffnungen zum Eingreifen der zugehörigen Hülse (18) der Gruppe von an den Wasserkasten angeschlossenen Rohren (6), gebohrt sind.
6. Vorrichtung nach Anspruch 2, dadurch gekennzeichnet, daß die mit dem Dampfsammler verbundene Hülse (38) mit ihrer Achse vertikal angeordnet ist und einen in eine horizontale Wandung des Dampfsammlers eingreifenden Bereich und einen in die Innenkammer des Dampfsammlers vorstehenden Bereich aufweist und mit einem Boden mit einer zentralen Öffnung (44) verschlossen ist, auf der die Klappe (45) in der Öffnungsstellung ruht, wobei mindestens eine Öffnung (41) die Seitenwand des vorstehenden Bereichs der Hülse (38) oberhalb der Klappe (45) für den Austritt des Dampfs in das Innenvolumen des Sammlers durchquert.
EP83400684A 1982-03-31 1983-03-31 Behelfsabsperreinrichtung für ein Dampferzeugerrohr im Falle eines Lecks Expired EP0091374B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8205542 1982-03-31
FR8205542A FR2524609A1 (fr) 1982-03-31 1982-03-31 Dispositif d'obturation de secours, en cas de fuite, d'un tube d'un generateur de vapeur

Publications (2)

Publication Number Publication Date
EP0091374A1 EP0091374A1 (de) 1983-10-12
EP0091374B1 true EP0091374B1 (de) 1985-07-17

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP83400684A Expired EP0091374B1 (de) 1982-03-31 1983-03-31 Behelfsabsperreinrichtung für ein Dampferzeugerrohr im Falle eines Lecks

Country Status (5)

Country Link
US (1) US4469051A (de)
EP (1) EP0091374B1 (de)
JP (1) JPS5912202A (de)
DE (1) DE3360400D1 (de)
FR (1) FR2524609A1 (de)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2544053B1 (fr) * 1983-04-07 1985-06-28 Commissariat Energie Atomique Generateur de vapeur pour reacteur refroidi par un metal liquide
FR2563895B1 (fr) * 1984-05-04 1986-10-31 Novatome Perfectionnement aux generateurs de vapeur a corps central du type sodium-eau
US4572113A (en) * 1985-02-01 1986-02-25 Baughman George W Water leak control circuit
GB8806699D0 (en) * 1988-03-21 1988-04-20 Atomic Energy Authority Uk Tube & shell heat exchangers
DE19935472C2 (de) * 1999-07-28 2002-04-25 Forschungszentrum Juelich Gmbh Dampferzeugungsanlage mit einem Kernreaktor und einem Dampferzeuger
ITMI20081495A1 (it) * 2008-08-07 2010-02-08 Ansaldo Nucleare Spa Gruppo di scambio termico, in particolare per sottrarre calore a un fluido primario di raffreddamento di un reattore nucleare
KR20120046236A (ko) * 2009-07-09 2012-05-09 쉘 인터내셔날 리써취 마트샤피지 비.브이. 열 교환기

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2439117A (en) * 1942-04-11 1948-04-06 Waterman William Automatic cutoff
US3294934A (en) * 1964-01-21 1966-12-27 J T Norris Pressure responsive devices
FR1440702A (fr) * 1965-04-02 1966-06-03 Commissariat Energie Atomique Dispositif de limitation de débit, notamment pour réacteur nucléaire
FR1530196A (fr) * 1967-07-04 1968-06-21 Babcock & Wilcox Co Générateur de vapeur
GB1276838A (en) * 1968-07-18 1972-06-07 Atomic Energy Authority Uk Improvements in or relating to pressure relief devices
US3713969A (en) * 1969-09-16 1973-01-30 Cons Edison Co Emergency shut-off valve for nuclear reactors
US3924675A (en) * 1973-05-03 1975-12-09 Us Energy Energy absorber for sodium-heated heat exchanger
DE2430724C3 (de) * 1974-06-26 1978-06-08 Kraftwerk Union Ag, 4330 Muelheim Steuerbares Ventil
FR2449260A1 (fr) * 1979-02-14 1980-09-12 Commissariat Energie Atomique Echangeur thermique

Also Published As

Publication number Publication date
DE3360400D1 (en) 1985-08-22
FR2524609A1 (fr) 1983-10-07
EP0091374A1 (de) 1983-10-12
US4469051A (en) 1984-09-04
FR2524609B1 (de) 1984-06-01
JPS5912202A (ja) 1984-01-21

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