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EP0568434B1 - Vorrichtung zur Abgabe und Verteilung von Speise- und Rezirkulationswasser in der Sekundärseite eines Dampferzeugers - Google Patents

Vorrichtung zur Abgabe und Verteilung von Speise- und Rezirkulationswasser in der Sekundärseite eines Dampferzeugers Download PDF

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Publication number
EP0568434B1
EP0568434B1 EP93401075A EP93401075A EP0568434B1 EP 0568434 B1 EP0568434 B1 EP 0568434B1 EP 93401075 A EP93401075 A EP 93401075A EP 93401075 A EP93401075 A EP 93401075A EP 0568434 B1 EP0568434 B1 EP 0568434B1
Authority
EP
European Patent Office
Prior art keywords
space
tubes
annular
supply pipe
steam generator
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 - Lifetime
Application number
EP93401075A
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English (en)
French (fr)
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EP0568434A1 (de
Inventor
Yves Pascal
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.)
Areva NP SAS
Original Assignee
Framatome SA
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Filing date
Publication date
Application filed by Framatome SA filed Critical Framatome SA
Publication of EP0568434A1 publication Critical patent/EP0568434A1/de
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Publication of EP0568434B1 publication Critical patent/EP0568434B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22D—PREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER FOR STEAM GENERATION; FEED-WATER SUPPLY FOR STEAM GENERATION; CONTROLLING WATER LEVEL FOR STEAM GENERATION; AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHIN STEAM BOILERS
    • F22D11/00—Feed-water supply not provided for in other main groups
    • F22D11/003—Emergency feed-water supply
    • 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
    • F22B1/023—Methods of steam generation characterised by form of heating method by exploitation of the heat content of hot heat carriers with heating tubes for nuclear reactors, as long as they are not classified according to a specified heating fluid, in another group
    • F22B1/025—Methods of steam generation characterised by form of heating method by exploitation of the heat content of hot heat carriers with heating tubes for nuclear reactors, as long as they are not classified according to a specified heating fluid, in another group with vertical U shaped tubes carried on a horizontal tube sheet
    • 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

Definitions

  • the invention relates to a steam generator designed for use in a pressurized water nuclear reactor and in which means are provided for ensuring a controlled distribution of the feed water injected at the bottom of the steam generator and of the recirculation from the condensation of secondary water vapor in the upper part of the generator.
  • a steam generator equipping a nuclear power plant usually comprises an outer envelope, of vertical axis, the interior space of which is divided into two parts, in the direction of the height, by a horizontal plate called “tube plate” (in English "tube sheet”).
  • the ends of the tubes of an inverted U-shaped tube bundle are fixed on the tube plate and open below it respectively in an intake manifold and in a collector for evacuating the water circulating in the circuit.
  • reactor primary called “primary water”.
  • the water circulating in the secondary circuit of the reactor called “secondary water” or “edible water” is injected into the part of the steam generator located above the tube plate.
  • the injection of drinking water is ensured by a main supply manifold of semi-toric shape, located above a space recirculation ring formed between the outer envelope and an inner envelope covering the tube bundle and the lower edge of which is spaced from the tube plate.
  • the food water introduced into the steam generator by the main supply manifold descends into this annular space, then rises between the tubes of the bundle inside the interior envelope.
  • the heat taken from the primary water circulating inside the tubes then has the effect of vaporizing the drinking water when it reaches the upper region of the inner envelope.
  • the steam thus formed then passes through separators and dryers which lower the humidity level of the steam before it escapes towards the turbines of the secondary circuit used to drive the electric generators of the power station.
  • recirculation water The condensed water retained in the separators, generally called “recirculation water”, descends by gravity into the annular recirculation space, in order to carry out a new passage in the interior envelope of the generator.
  • migrant bodies such as objects (welding rods, screws, bolts, etc.) inadvertently introduced into the secondary circuit during their production enter the steam generator through the water intake manifold food, they can become trapped between the bundle tubes and therefore damage these tubes.
  • the invention specifically relates to a steam generator whose original design sees the main supply manifold located at the bottom of the secondary part, while ensuring a controlled distribution of the distribution of drinking water and recirculating water on the periphery of the secondary part of the generator and allowing possible trapping of migrant bodies from the food water circuit, likely to enter the bundle of tubes and damage them.
  • the perforated flange which is placed in the annular recirculation space above the supply manifold generates a flow limitation or a pressure loss high enough to impose on the drinking water which enters the annular space a movement down and to control the proportion of recirculating water that enters this space, especially in the region located above the supply manifold.
  • first means for trapping migrant bodies are placed in the annular recirculation space, at a level lower than that of the supply pipe.
  • a deflector is advantageously placed inside the annular recirculation space, in the extension of this supply pipe.
  • the invention can be applied equally to economizer steam generators or to boiler-type steam generators.
  • the supply pipe opens into the first region and the perforated flange is placed above this first region.
  • the supply manifold opens into the annular recirculation space, on the side of the cold branches of the tubes, the perforated flange extending over the entire circumference of this annular space.
  • a distribution flange having perforations of variable section then extends over the entire circumference of the annular space, at a level lower than that of the supply manifold.
  • the perforated collar can also perform the function of trapping the migrant bodies introduced into the steam generator by the emergency power collector.
  • This flange then has perforations having a maximum diameter less than a minimum distance between the tubes of the beams.
  • the distribution flange used in the case of a steam generator of the boiler type can also optionally provide the trapping function for migrant bodies.
  • the perforations of this distribution collar then have a maximum diameter less than the minimum distance between the tubes of the bundle.
  • the reference 10 designates the outer envelope of revolution, of vertical axis, of a steam generator intended to ensure the transfer of heat between the primary water circuit and the secondary water-steam circuit of a pressurized water nuclear reactor. More precisely, the steam generator illustrated diagrammatically in FIG. 1 is a steam generator with an economizer and an intermediate skirt.
  • the external envelope 10 defines an enclosed internal space which is separated into a primary lower zone and a secondary upper zone by a horizontal tube plate 12 tightly connected to the external envelope 10.
  • a vertical partition 14 divides the primary lower zone, usually called a "water box", into an intake manifold 16 and an evacuation manifold 18 of the water circulating in the primary circuit of the reactor.
  • Tubing 20 and 22 are part of the water box and connect the collectors 16 and 18 respectively to this primary circuit.
  • each of the tubes comprises a hot vertical branch whose lower end opens into the intake manifold 16 and a cold vertical branch whose lower end opens into the exhaust manifold 18.
  • the bundle of tubes 24 is surrounded and capped by an interior envelope 26 arranged coaxially in the exterior envelope 10.
  • the upper part of this interior envelope 26 communicates with water-vapor separators 28, which open at their ends.
  • upper in dryers (not shown) connected to a steam exhaust pipe (not shown) located at the top of the outer casing 10.
  • the lower edge of the inner casing 26 is placed at a determined distance above the tube plate 12, so as to form a passage between an annular recirculation space 32 delimited between the envelopes 10 and 26 and the space 27 inside the interior envelope 26.
  • Horizontal spacer plates 34 regularly spaced over the entire height of the bundle of tubes 24, maintain these tubes inside the inner casing 26.
  • a vertical partition 36 rises in the bundle of tubes, from the tube plate 12, between the hot and cold branches of the tubes 24 , so as to physically separate these two branches over the entire lower part of the space 27 delimited in the inner envelope 26.
  • a distribution plate 38 having a different permeability on the side of the hot branches and on the side of the cold branches, so as to ensure effective scanning of the tube plate 12 and a distribution as homogeneous as possible of the drinking water, mixed with the recirculating water, which rises inside the interior envelope 26.
  • the steam generator of FIGS. 1 and 2 further comprises an intermediate skirt 40 which at least partially encircles the inner envelope 26, on the side of the cold branches of the tubes 24, as illustrated in FIG. 2.
  • the two circumferential ends of this skirt 40 are connected to the inner casing 26 by two end partitions 42 ( Figure 2), so as to form in the annular recirculation space 32 an overheating zone 44, delimited between the inner casing 26, the skirt 40 and the partitions 42.
  • the intermediate skirt 40 is connected at its lower end to the tube plate 12 and preferably has, near this plate, openings 45, as shown schematically in Figure 1. We also see in this figure, that the skirt 40 can support immediately above the openings 45 a horizontal deflector 46 allowing the stream of food water descending inside the overheating zone 44 to be diverted towards the central part of the steam generator, when it reaches near the tube plate 12.
  • the intermediate skirt 40 rises in the annular recirculation space 32 to a sufficient level above the tube plate 12, as illustrated in FIG. 1.
  • the entry of drinking water into the steam generator takes place, on the side of the cold branches of the bundle of tubes 24, by at least one supply tube 48 connected to the outer casing 10 of the steam generator and extended by a thermal sleeve 50 connected directly to the intermediate skirt 40.
  • the supply pipe 48 opens directly into the overheating zone 44.
  • the steam generator also comprises an emergency supply manifold 52, of toroidal shape, placed around the internal envelope 26, in the upper part of the annular recirculation space 32.
  • This emergency collector 52 can be supplied, in the event of an incident in the secondary circuit, by a supply pipe (not shown) which passes through sealingly the outer envelope 10. It opens inside the steam generator by perforations formed on its upper generator.
  • a perforated flange 56 is placed in the overheating zone 44, near the upper edge of the intermediate skirt 40, that is to say at a level substantially higher than that of the supply pipe. 48.
  • the perforated collar 56 is a flat and horizontal collar which extends over the entire section of the overheating zone 44.
  • this collar can take any shape and orientation, such as '' a curvilinear shape and / or an inclined orientation.
  • the perforated collar 56 has perforations 57 (FIG. 2) whose shape, number and distribution make it possible to control the distribution of the distribution of drinking water and recirculating water in the secondary part of the steam generator.
  • this limitation of flow rate or this pressure drop also has the effect of lowering the recirculated water preferentially. in the part of the annular recirculation space 32 external to the overheating zone 44 rather than in this overheating zone. This promotes, in combination with the openings 45 formed in the bottom of the skirt 40, the flow of warmer recirculation water along the outer casing 10 and the tube plate 12, which improves the thermal balance of the outer casing and the tube plate.
  • the limitation of flow rate or the pressure drop induced by the perforated flange 56 can result in allowing only about 10% of the recirculating water to pass into the overheating zone 44.
  • the steam generator also comprises a first device 58 for trapping migrant bodies, placed in the overheating zone 44, at a level lower than that of the supply pipe 48.
  • the main function of device 58 is to prevent migrant bodies which risk being blocked between the tubes 24 of the bundle from entering these tubes.
  • this device can in particular be in the form of a grid or an equivalent system, providing a very large number of passages whose dimensions are less than the minimum distance separating the tubes 24.
  • a second device for trapping migrant bodies 60 is placed at the top of the annular recirculation space 32, below the emergency supply manifold 52, in order to prevent migrant bodies being introduced into the generator vapor by this collector can not get caught between the tubes 24 of the bundle.
  • the characteristics and structure of this device 60 are moreover comparable to those of the device 58.
  • inspection openings can be made in the pressure envelope 10 and in the skirt 40 in order to collect any trapped migrant objects.
  • the drinking water which enters the superheating zone 44 through the supply pipe 48 descends into this zone, in particular under the effect of limiting the flow rate or the pressure drop induced by the perforated flange 56, as illustrated by the arrows in FIG. 1.
  • the food water then rises around the tubes 24, inside the inner envelope 26, by mixing with the recirculation water which mostly descends in the regions of the annular space 32 distinct from the overheating zone 44, again under the effect of the flow limitation or the pressure drop induced by the perforated collar 56.
  • the permeability of the perforated flange 56 can vary circumferentially, so as to allow precise local control of the flows.
  • FIGS. 3 and 4 a steam generator with an economizer is shown, devoid of an intermediate skirt.
  • This steam generator has many characteristics identical to the previous one, so that only the characteristics which differ from it will now be described.
  • the vertical partition 36 which separates the hot and cold branches of the tubes 24 from the bundle above the tube plate 12 is extended in the intermediate recirculation space 32, by two complementary vertical partitions 62.
  • the supply pipe (s) 48 open directly into the annular recirculation space 32, on the side of the cold branches of the tubes 24.
  • the perforated collar 56 is placed directly in the annular recirculation space 32, at a level substantially higher than that of the supply pipe 48.
  • the perforated collar 56 extends over the entire width of the space 32 and over half of the circumference of this space situated on the side of the cold branches of the tubes 24, as shown in FIG. 3, up to the vertical partitions 62, which rise for this purpose over a height greater than that of the vertical partition 36 separating the hot and cold branches from the tubes.
  • the perforated flange 56 induces a flow limitation or a pressure drop sufficient to prevent the food water introduced by the supply pipe 48 from rising above the upper edges of the partitions 62.
  • the pressure drop or flow limitation may however be slightly less than the previous case, so that the sweeping of the external enclosure 10 by the recirculating water is sufficient on the side of the cold branches to avoid thermal stresses too large are generated between this side and the opposite side of the steam generator.
  • a migrant trapping device 58 is placed at a level lower than that of the supply pipe 48, in the part of the annular recirculation space 32 surrounding the cold branches of the tubes 24, between the partitions 62.
  • a second device for trapping migrant bodies 60 is also placed at the top of the annular recirculation space 32, over the entire periphery of this space, just below the emergency power collector 52.
  • the characteristics and structures of the trapping devices for migrant bodies 58 and 60 are identical to those which have been described in the first embodiment.
  • FIGS. 5 and 6 of a steam generator of the boiler type produced in accordance with the invention.
  • This steam generator differs essentially from that which has just been described with reference to FIGS. 3 and 4 by the fact that it does not include any of the partitions 36 and 62.
  • the steam generator of the boiler type illustrated in FIGS. 5 and 6 essentially presents characteristics similar to those of the steam generators described above, so that only the characteristics which distinguish this generator from the preceding will now be described.
  • the supply pipe 48 opens directly into the annular recirculation space 32.
  • a deflector 64 has been placed in the extension of this pipe 48, in order to d bending downwards as soon as it enters the space 32 the flow of food water introduced through the tube 48.
  • the perforated flange 56 which is placed at the top of the annular recirculation space, at a level higher than that of the supply pipe 48, occupies the entire periphery of this space.
  • the perforated flange 56 mainly has the function of ensuring the desired distribution of the recirculated water which flows in the space 32, between the parts of this space surrounding the cold branches of the tubes 24 and the parts of this space surrounding the hot branches.
  • the perforations made in the perforated flange 56 can ensure a preferential distribution of the recirculating water on the side of the hot branches or, on the contrary, a substantially uniform distribution of the recirculating water over the entire periphery of the annular space 32.
  • a first device for trapping migrant bodies 58 is placed in the annular recirculation space 32, at a level lower than that of the supply pipe 48. In this case, this device 58 however extends over the entire periphery of the space 32.
  • this device for trapping migrant bodies 58 is advantageously in the form of a distribution flange, the perforations of which have a maximum diameter less than the minimum distance between the tubes 24 of the bundle.
  • these perforations have variable sections over the entire periphery of the device 58, so as to generate flow limitations or variable pressure losses allowing the distribution of the feed water and recirculating water flows penetrating to be controlled. inside the inner casing 26, at the base of the tube bundle.
  • the perforated collar 56 which is placed below the emergency power collector 52, can also constitute a second device for trapping migrant bodies possibly introduced by this collector 52.
  • the perforations which are produced in the collar 56 have a maximum diameter less than the maximum distance between the tubes 24 of the beam.
  • the combined effect of the deflector 64 and the distribution flange forming the device for trapping migrant bodies 58 can result in distributing the food water introduced into the generator through the supply pipe 48 according to a proportion of about 80% on the side of the cold branches of the tubes 24 and about 20% on the side of the hot branches.
  • the deflector 64 described with reference to FIG. 6 can be used in the other embodiments.
  • the steam generator can comprise several supply pipes 48 without departing from the scope of the invention.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Water Supply & Treatment (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
  • Structure Of Emergency Protection For Nuclear Reactors (AREA)

Claims (9)

  1. Dampferzeuger, umfassend:
    - eine Außenhülle (10) mit vertikaler Achse;
    - eine Röhrenplatte (12), auf abdichtende Weise im Innern der Außenhülle befestigt;
    - ein Bündel von Röhren (24) mit der Form eines umgekehrten U, heiße Zweige und kalte Zweige umfassend und jedes zwei Enden aufweisend, die an der Röhrenplatte befestigt sind und unter dieser letzteren in einen Zuflußsammler (16) beziehungsweise einen Abflußsammler (18) von Primärfluid bzw. -kühlmittel münden;
    - eine Innenhülle (26), die das Röhrenbündel überdeckt und von der ein unterer Rand von der Röhrenplatte beabstandet ist und mit der Außenhülle einen ringförmigen Rezirkulationsraum (32) bildet;
    - Einrichtungen zur Versorgung mit Sekundärwasser; und
    - Einrichtungen (28,30) zum Trennen von Rezirkulationswasser, das durch besagten Raum wieder nach unten fließen kann, und von Sekundärdampf, der aus dem Dampferzeuger abgeleitet werden kann, wobei diese Trenneinrichtungen sich über der Innenhülle befinden;
    - Sekundärwasser-Versorgungseinrichtungen die wenigstens einen Zuflußstutzen (48) umfassen, der direkt in dem ringförmigen Rezirkulationsraum mundet,
    dadurch gekennzeichnet,
    daß in dem ringförmigen Rezirkulstionsraum wenigstens ein durchlöcherter Kragen (56) angebracht ist, auf einem höheren Niveau als dem des Zuflußstutzens, so daß er sich einem Ansteigen des Sekundärwassers in besagtem Raum wiedersetzt und eine kontrollierte Umfangsverteilung des in diesem Raum absinkenden Rezirkulationswassers gewährleistet.
  2. Dampferzeuger nach Anspruch 1, dadurch gekennzeichnet, daß erste Fangeinrichtungen (58) für wanderndes Material in dem ringförmigen Rezirkulationsraum (32) angeordnet sind, auf einem niedrigeren Niveau als dem des Zuflußstutzens (48).
  3. Dampferzeuger nach einem der Ansprüche 1 und 2, dadurch gekennzeichnet, daß ein Sicherheitsversorgungssammler (52) über dem ringförmigen Rezirkulationsraum (32) angeordnet ist, wobei zweite Fangeinrichtungen (60) für wanderndes Material in dem ringförmigen Rezirkulationsraum angeordnet sind, unterhalb des Sicherheitsversorgungssammlers.
  4. Dampferzeuger nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, daß ein Ablenker (64) im Innern des ringförmigen Rezirkulationsraums (32) angeordnet ist, in der Verlängerung jedes Zuflußstutzens, um das Sekundärwasser nach unten abzulenken.
  5. Dampferzeuger nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, daß eine Zwischenschürze (40) die Innenhülle (26) um die kalten Zweige der Rohre herum wenigstens teilweise dupliziert bzw. umgibt, um mit der Innenhülle eine zum ringförmigen Rezirkulationsraum (32) gehörende Überhitzungszone (44) abzugrenzen, wobei der Zuflußstutzen (48) in diese Überhitzungszone mündet und besagter durchlöcherter Kragen (56) in der Überhitzungszone (44) angeordnet ist.
  6. Dampferzeuger nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß ein unterer Teil des ringförmigen Rezirkulationsraums (32) durch vertikale Trennwände (62) unterteilt ist in einen ersten, die kalten Zweige der Rohre umgebenden Bereich und einen zweiten, die warmen Zweige der Rohre umgebenden Bereich, der Zuflußstutzen (48) in den ersten Bereich mündet und der durchlöcherte Kragen (56) über diesem ersten Bereich angeordnet ist.
  7. Dampferzeuger nach einem der Anspruche 1 bis 5, dadurch gekennzeichnet, daß der Zuflußstutzen (48) in den ringförmigen Rezirkulationsraum mundet, auf der Seite der kalten Zweige der Rohre, wobei der durchlocherte Kragen (56) sich über den gesamten Umfang dieses ringformigen Raums erstreckt, und ein Verteilungskragen (58) mit Löchern unterschiedlichen Querschnitts sich über den gesamten Umfang des ringförmigen Raums erstreckt, auf einem niedrigeren Niveau als dem des Zuflußstutzens.
  8. Dampferzeuger nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, daß der durchlöcherte Kragen (56) Löcher aufweist, die einen Höchstdurchmesser haben, der kleiner ist als eine Minimaldistanz zwischen den Rohren des Bündels.
  9. Dampferzeuger nach Anspruch 7, dadurch gekennzeichnet, daß die Löcher des Verteilungskragens (58) einen Höchstdurchmesser haben, der kleiner ist als eine Minimaldistanz zwischen den Rohren des Bündels.
EP93401075A 1992-04-28 1993-04-26 Vorrichtung zur Abgabe und Verteilung von Speise- und Rezirkulationswasser in der Sekundärseite eines Dampferzeugers Expired - Lifetime EP0568434B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9205219A FR2690504B1 (fr) 1992-04-28 1992-04-28 Generateur de vapeur a dispositif de distribution et de reparation de l'eau alimentaire et de l'eau de recirculation dans la partie secondaire.
FR9205219 1992-04-28

Publications (2)

Publication Number Publication Date
EP0568434A1 EP0568434A1 (de) 1993-11-03
EP0568434B1 true EP0568434B1 (de) 1996-07-17

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EP93401075A Expired - Lifetime EP0568434B1 (de) 1992-04-28 1993-04-26 Vorrichtung zur Abgabe und Verteilung von Speise- und Rezirkulationswasser in der Sekundärseite eines Dampferzeugers

Country Status (6)

Country Link
US (1) US5323736A (de)
EP (1) EP0568434B1 (de)
KR (1) KR930022001A (de)
CA (1) CA2094882A1 (de)
DE (1) DE69303657D1 (de)
FR (1) FR2690504B1 (de)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6176977B1 (en) 1998-11-05 2001-01-23 Sharper Image Corporation Electro-kinetic air transporter-conditioner
US8215379B2 (en) * 2009-04-29 2012-07-10 Babcock & Wilcox Canada Ltd. Feedwater debris trap
US9534779B2 (en) * 2011-04-04 2017-01-03 Westinghouse Electric Company Llc Steam generator tube lane flow buffer
JP2012220043A (ja) * 2011-04-04 2012-11-12 Mitsubishi Heavy Ind Ltd 蒸気発生器
CN114017765B (zh) * 2021-11-03 2024-03-29 中广核研究院有限公司 蒸汽发生器流量分配结构

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3503373A (en) * 1966-09-01 1970-03-31 Westinghouse Electric Corp Vapor generating apparatus
DE2346411A1 (de) * 1973-09-14 1975-04-03 Kraftwerk Union Ag Dampferzeuger
US3916844A (en) * 1974-07-29 1975-11-04 Combustion Eng Steam generator blowdown apparatus
FR2394750A1 (fr) * 1977-06-15 1979-01-12 Commissariat Energie Atomique Generateur de vapeur
FR2477265A1 (fr) * 1980-02-29 1981-09-04 Framatome Sa Generateur de vapeur a prechauffage
DE3573827D1 (en) * 1984-11-15 1989-11-23 Westinghouse Electric Corp Perforated flow distribution plate
FR2644926B1 (fr) * 1989-03-22 1991-06-07 Framatome Sa Generateur de vapeur a prechauffage

Also Published As

Publication number Publication date
DE69303657D1 (de) 1996-08-22
FR2690504B1 (fr) 1994-06-03
EP0568434A1 (de) 1993-11-03
FR2690504A1 (fr) 1993-10-29
US5323736A (en) 1994-06-28
KR930022001A (ko) 1993-11-23
CA2094882A1 (en) 1993-10-29

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