EP2630645A1 - Dispositif et procede de remplacement d'un assemblage combustible irradie par un assemblage combustible neuf dans la cuve d'un reacteur nucleaire et reacteur nucleaire comprenant un tel dispositif - Google Patents
Dispositif et procede de remplacement d'un assemblage combustible irradie par un assemblage combustible neuf dans la cuve d'un reacteur nucleaire et reacteur nucleaire comprenant un tel dispositifInfo
- Publication number
- EP2630645A1 EP2630645A1 EP11749198.5A EP11749198A EP2630645A1 EP 2630645 A1 EP2630645 A1 EP 2630645A1 EP 11749198 A EP11749198 A EP 11749198A EP 2630645 A1 EP2630645 A1 EP 2630645A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- fuel assembly
- irradiated
- reactor
- pots
- new
- 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.)
- Withdrawn
Links
Classifications
-
- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21C—NUCLEAR REACTORS
- G21C19/00—Arrangements for treating, for handling, or for facilitating the handling of, fuel or other materials which are used within the reactor, e.g. within its pressure vessel
- G21C19/18—Apparatus for bringing fuel elements to the reactor charge area, e.g. from a storage place
-
- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21C—NUCLEAR REACTORS
- G21C19/00—Arrangements for treating, for handling, or for facilitating the handling of, fuel or other materials which are used within the reactor, e.g. within its pressure vessel
- G21C19/19—Reactor parts specifically adapted to facilitate handling, e.g. to facilitate charging or discharging of fuel elements
-
- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21C—NUCLEAR REACTORS
- G21C19/00—Arrangements for treating, for handling, or for facilitating the handling of, fuel or other materials which are used within the reactor, e.g. within its pressure vessel
- G21C19/20—Arrangements for introducing objects into the pressure vessel; Arrangements for handling objects within the pressure vessel; Arrangements for removing objects from the pressure vessel
-
- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21C—NUCLEAR REACTORS
- G21C19/00—Arrangements for treating, for handling, or for facilitating the handling of, fuel or other materials which are used within the reactor, e.g. within its pressure vessel
- G21C19/20—Arrangements for introducing objects into the pressure vessel; Arrangements for handling objects within the pressure vessel; Arrangements for removing objects from the pressure vessel
- G21C19/205—Interchanging of fuel elements in the core, i.e. fuel shuffling
-
- 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
Definitions
- the invention relates to a device and a method for replacing an irradiated fuel assembly with a new fuel assembly in the tank of a nuclear reactor and a nuclear reactor comprising such a device.
- Sodium-cooled nuclear reactors usually have a tank in which the core is located.
- a heart cover plug or BCC referenced 30 in Figure 1, located above the heart, includes the instrumentation necessary for the control and proper operation of nuclear reactions.
- the extraction of heat is done by circulating the sodium, called primary sodium, by means of a pumping system placed in the tank.
- the heat is transferred to an intermediate circuit, via one or more exchangers (s), before being used to produce steam in a steam generator.
- This steam is then sent to a turbine to transform it into mechanical energy, which in turn is transformed into electrical energy.
- the intermediate circuit makes it possible to isolate the primary sodium which is in the tank, with respect to the steam generator, and this, because of the violent reactions that may occur between the sodium and the water-vapor contained in the steam generator.
- Sodium cooled reactors have common technical characteristics.
- the tank is sealed on the top by a closure slab so that the primary sodium is not in contact with the outside air. All the components (exchangers, pumps, pipes, ...) pass through this slab vertically so that they can be disassembled and lifted vertically by a lifting device, using passage holes in this closure slab.
- loop-type SFR reactors intermediate heat exchangers and pumping devices primary sodium are located outside the tank.
- the intermediate exchangers and the means for pumping the primary sodium are entirely located in the tank, which, while avoiding causing the primary circuit to leave the tank, constitutes an important advantage.
- a reactor of this type has been selected in the "SuperPhismex" reactor in France, or in the project under the name EFR or "European Fast Reactor", as described in the document referenced [1] at the end of the description.
- the primary sodium passes through the core 11 to carry off the calories produced.
- the primary sodium arrives in an area 12 of the tank 13 of the reactor closed by the closure slab 24: commonly called hot collector.
- This hot collector is separated from another zone 14, called the cold collector, by a wall 15 of cylindrical-conical shape called redan, consisting of a lower part 15a which surrounds the core 11 and which has a general shape of a truncated cone and an upper portion 15b which is a cylindrical portion.
- Each intermediate exchanger 16 consists of a tube bundle in which the secondary sodium circulates and between which the primary sodium circulates. References 28 and 29 correspond to a supply pipe and a secondary sodium outlet pipe.
- the secondary sodium enters a central tube, passes through the exchanger, and opens at the bottom of the exchanger in a distribution box, which allows to supply sodium all tubes of the tube bundle, to come out at an outlet manifold.
- the path followed by the primary sodium is shown schematically in dashed lines 27 in FIG. 1.
- the primary sodium enters each intermediate exchanger 16 through inlet windows 17 situated in the hot collector 12, gives up its heat to the secondary sodium, along the tubes of each intermediate exchanger 16, and leaves the intermediate heat exchanger by exit windows 18.
- the primary sodium is sucked by pumping means 19 and sent directly to the inlet of the core 11, located below this one.
- the pumping means 19 consist of electromechanical pumps whose shaft extends vertically substantially over the entire height of the tank 13 and passes through the closure slab 24.
- the circulation of sodium in each intermediate exchanger 16 is carried out by gravity between the hot collector 12 and the cold collector 14.
- the driving load of the primary sodium Cm between the two collectors 12, 14 is calibrated to a value of approximately 2 m corresponding to the difference H of level between that 20 of the hot collector 12 and that 21 of the cold collector 14.
- Several specific exchangers 25, smaller in size than the intermediate exchangers 16, allow to evacuate the residual power of the core, which comes from the radioactive decay of the fission products that were created during the nuclear reactions when the reactor was in power (normal operation). These exchangers 25 are activated only when the reactor is stopped or in the event of an incident.
- the hydraulic path of the primary sodium consists of the hot column shown schematically by the arrow in solid lines 26 and the cold column represented by the dashed arrow 27.
- a nuclear reactor is equipped with a primary tank in which the nuclear core is located.
- This heart consists of several hundred fuel assemblies, similar to hexagonal pencils of 20cm side and about 4m high.
- a set of mechanisms inserted inside the primary tank is used to perform the following operations:
- the transport operations of a fuel assembly in a transfer hood from the reactor vessel to the washing or conditioning wells can be carried out in parallel with the operations of setting up and extracting the fuel. fuel assembly in or from the nuclear core.
- FIGS 2 and 3 illustrate a nuclear reactor, which thus comprises the following elements which have already been described and illustrated in Figure 1:
- a transfer hood 46 incorporating an "elevator” function using a gripper grapple, for approaching the new fuel assemblies and the evacuation of the irradiated fuel assemblies,
- the assistance device for loading / unloading fuel assemblies comprises:
- the handling arm 50 allowing the displacement of the new or new fuel assemblies 51 irradiated in three dimensions: radially, laterally by rotation and vertically,
- a rotor system 52 comprising sodium pots 53 in which fuel assemblies 54 are arranged.
- the rotor system 52 has a longer length than the EFR project, in order to have the clearance needed to insert a fuel assembly into a sodium pot.
- the rotor system is thus found on a height substantially equivalent to that of the nuclear core.
- main tank diameter is a fundamental issue because it has a direct impact on the cost of the reactor but the implantation of the rotor system inside the inner tank has a strong impact on the total diameter of the tank.
- main part 55 between the inner vessel and the main vessel being used by different components.
- the object of the invention is to propose an improvement of this rotor system making it possible to reduce the diameter of the reactor internal vessel and therefore the diameter of the main vessel and thus to reduce the cost of this reactor.
- the invention relates to a device for replacing a fuel assembly irradiated with a new fuel assembly in the tank of a nuclear reactor, which comprises:
- the means for placing the two fuel assemblies, the new fuel assembly being transported in the core while the irradiated fuel assembly is transported out of the reactor characterized in that the means for positioning the fuel assemblies two pots are positioning means by rotating in two offset axes of rotation performed by a single motor.
- the device of the invention comprises a monobloc structure surmounted in its upper part by a sealed housing.
- the sealed housing comprises a motor with a worm associated with two notched wheels each secured to one of the two axes for performing a simultaneous rotation of these two axes, and a closure valve of the upper part of the outlet corridor.
- the coolant is sodium.
- the invention also relates to a nuclear reactor, comprising a vessel adapted to be filled with coolant and inside which are arranged a core, pumping means for circulating the primary coolant, first intermediate heat exchangers adapted to evacuating the power produced by the core during normal operation, second residual heat exchangers adapted to evacuate the residual power produced by the stationary core when the pumping means are also at a standstill, and a closure slab, characterized in that it comprises a device as defined above.
- the reactor is a sodium-cooled reactor.
- the invention also relates to a method for replacing an irradiated fuel assembly with a new fuel assembly in the vessel of a nuclear reactor which comprises:
- a step of placing two fuel assemblies irradiated and nine in two pots containing coolant with filling of the first pot by the irradiated fuel assembly just extracted from the reactor core by a handling arm, and the second pot by the new fuel assembly provided by a transfer hood.
- the step of positioning the two pots is a positioning step by setting in rotation movement with two offset axes of rotation performed by a single motor.
- a motor with a worm associated with two notched wheels each secured to one of the two axes of rotation An outlet corridor is used, and two coolant pots interconnected by a connecting rod.
- the orifice of the exit passage is closed by means of a valve.
- the coolant is sodium.
- FIG. 1 illustrates a vertical sectional view of a nuclear reactor with a heat transfer medium of the known art.
- Figures 2 and 3 schematically illustrate a vertical sectional view and a top view of a nuclear reactor with sodium heat of the known art comprising a rotor system.
- FIGS. 4 to 17 illustrate details of the device for replacing an irradiated fuel assembly with a new fuel assembly in the reactor vessel of a heat-carrying nuclear reactor sodium, according to the invention, using two sodium pots, and more specifically:
- Figure 4 illustrates an isometric view of the device of the invention.
- Figure 5 illustrates a front view of the device of the invention in a first position of the two pots.
- Figure 6 illustrates a top view of the device of the invention.
- FIGS. 7A and 7B illustrate two views in section AA of the device of the invention as illustrated in FIG. 5, respectively with a shut-off valve of the upper part of an exit passage in the closed position and in the open position.
- FIG. 8 illustrates a view in section BB of the device of the invention as illustrated in FIG.
- Figures 9A and 9B illustrate two views in section CC of the device of the invention as shown in Figure 5, respectively with the two pots in the first position, and in a second position.
- Figure 10 illustrates a sectional view DD of the device of the invention as shown in Figure 5, the two pots being in the first position.
- FIG. 11 illustrates a detail F of the device of the invention as illustrated in FIG. 5.
- FIG. 12 illustrates a view in section MM of the device of the invention as illustrated in FIG. 8.
- Figure 13 illustrates the rotation control mechanism of the two pots.
- FIG. 14 illustrates a detail G of FIG. 12 with the drive shaft 80, a toothed wheel 74, a bearing 81, a seal 82, a ring 83 and an axis of rotation 65.
- FIG. 15 illustrates a detail J of FIG. 13 with the rotor shaft 80, a bearing 85, a seal 86 and a ring 87.
- FIG. 16 illustrates a detail H of FIG. 12, with the axis of rotation 65 and a ring 88.
- FIG. 17 illustrates a detail I of FIG. 12, with a ring 91 and the axis of rotation 65.
- Figure 18 illustrates the kinematics of the device of the invention.
- FIG. 19 illustrates the gain in size that the device of the invention allows in a nuclear reactor.
- the invention relates to a device for replacing an irradiated fuel assembly, or used, by a new fuel assembly in the tank of a nuclear reactor.
- This device comprises:
- each pot having a cylindrical shape closed at its lower end, with filling of the first pot by the irradiated fuel assembly just extracted from the nuclear core by a primary handling arm and, advantageously, a nerdy handling, and the second pot by the new fuel assembly, provided by a transfer hood,
- the device of the invention comprises a double rotor system 60, as illustrated in FIGS. 4 to 17, which comprises:
- a one-piece structure formed by a parallelepipedal metal frame 61 of elongated shape along a vertical axis open on one of its elongate faces 62 to be accessible by the handling arm, surmounted in its upper part by a sealed housing 63;
- the sealed housing 63 comprises a motor 71 with a worm 72 associated with two notched wheels 73 and 74 integral each of one of the two axes 64 and 65, each toothed wheel meshing on the worm, and for performing a simultaneous rotation of these two axes, and a valve 75 closing the upper part of the corridor output 66.
- the two axes of rotation 64 and 65 are shifted in order to allow a coordinated movement of the two coolant pots 68 and 69, made by the single motor 71. Only rotary movements are solicited . The overall size of the assembly obtained is thus optimized.
- the upper part of the device of the invention illustrated in FIG. 13 constituted by the sealed casing 63 which encloses the rotation mechanisms, is sealed with respect to the reactor vessel by the seal 82.
- the two ball joints 92 are then made by bearings whose grease can not alter the coolant of the reactor.
- rings 88 and 91 make the other connections.
- the two pots 68 and 69 in rotation are secured by a link 70 to stiffen the entire mechanism.
- the exit corridor 66 allows a pot 68 or 69 to be guided during the extraction of an irradiated fuel assembly or the addition of a new fuel assembly, this corridor being split along its entire length to enable the handling arm to access it in case of blockage of the dual rotor device of the invention.
- the upper part of this device is lubricated and sealed with respect to the reactor vessel.
- the transfer hood can thus dock at the upper part of the device of the invention, the sealing with respect to this device being carried out thanks to the valve 75.
- the device and method of the invention can advantageously be implemented in a sodium heat transfer reactor, pots 68 and 69 then being sodium pots.
- FIG. 18 The kinematics of the double-rotor device of the invention is illustrated in FIG. 18.
- the rotational guidance of the two axes 64 and 65 is effected by a link comparable to a ball 92 at the top, and two annular linear links 93 and 94 in the middle and low part, thus allowing free expansion of the pins 64 and 65 in the frame 61.
- the device of the invention allows a gain in space with respect to a conventional rotor device 50 and a decrease in diameter of the inner vessel 41 and therefore of the main vessel 40.
- the expected gain (reduction diameter 90) is about 10% over the diameter.
- the device of the invention allows, in addition, an accessibility of the output pot by the handling arm in case of blockage of the dual rotor device of the invention.
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Plasma & Fusion (AREA)
- General Engineering & Computer Science (AREA)
- High Energy & Nuclear Physics (AREA)
- Monitoring And Testing Of Nuclear Reactors (AREA)
- Jib Cranes (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR1058641A FR2966638B1 (fr) | 2010-10-22 | 2010-10-22 | Dispositif et procede de remplacement d'un assemblage combustible irradie par un assemblage combustible neuf dans la cuve d'un reacteur nucleaire et reacteur nucleaire comprenant un tel dispositif |
PCT/EP2011/064949 WO2012052213A1 (fr) | 2010-10-22 | 2011-08-31 | Dispositif et procede de remplacement d'un assemblage combustible irradie par un assemblage combustible neuf dans la cuve d'un reacteur nucleaire et reacteur nucleaire comprenant un tel dispositif |
Publications (1)
Publication Number | Publication Date |
---|---|
EP2630645A1 true EP2630645A1 (fr) | 2013-08-28 |
Family
ID=43577333
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP11749198.5A Withdrawn EP2630645A1 (fr) | 2010-10-22 | 2011-08-31 | Dispositif et procede de remplacement d'un assemblage combustible irradie par un assemblage combustible neuf dans la cuve d'un reacteur nucleaire et reacteur nucleaire comprenant un tel dispositif |
Country Status (8)
Country | Link |
---|---|
US (1) | US20130315363A1 (fr) |
EP (1) | EP2630645A1 (fr) |
JP (1) | JP2013541714A (fr) |
KR (1) | KR20130140008A (fr) |
CN (1) | CN103180911A (fr) |
FR (1) | FR2966638B1 (fr) |
RU (1) | RU2013123366A (fr) |
WO (1) | WO2012052213A1 (fr) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR3019931B1 (fr) * | 2014-04-11 | 2016-05-13 | Commissariat Energie Atomique | Unite de chargement / dechargement d'assemblages combustibles d'un reacteur refroidi au metalliquide, tel qu'un reacteur rnr-na ou sfr, integrant un dispositif de mesure de la puissance residuelle |
FR3021154B1 (fr) * | 2014-05-16 | 2016-07-01 | Commissariat Energie Atomique | Reacteur nucleaire integre a neutrons rapides comportant au moins deux ciels de pile |
CN104051035B (zh) * | 2014-07-02 | 2016-09-28 | 中国科学院合肥物质科学研究院 | 一种用于液态重金属反应堆堆芯组件更换装置 |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2161754B1 (fr) * | 1971-10-28 | 1974-05-31 | Commissariat Energie Atomique | |
FR2368122A1 (fr) * | 1976-10-15 | 1978-05-12 | Commissariat Energie Atomique | Dispositif de chargement et dechargement en combustible pour reacteur nucleaire |
JPS59157595A (ja) * | 1983-02-28 | 1984-09-06 | 株式会社東芝 | 炉内中継装置 |
JPS6040995A (ja) * | 1983-08-16 | 1985-03-04 | 動力炉・核燃料開発事業団 | 液体金属冷却高速増殖炉 |
JPH068902B2 (ja) * | 1986-08-29 | 1994-02-02 | 株式会社東芝 | 高速増殖炉の炉内中継装置 |
JPH0782111B2 (ja) * | 1991-08-07 | 1995-09-06 | 動力炉・核燃料開発事業団 | 原子炉内燃料交換方法 |
JP3085788B2 (ja) * | 1992-06-30 | 2000-09-11 | 三菱重工業株式会社 | 燃料要素交換装置 |
CN101783190A (zh) * | 2010-03-09 | 2010-07-21 | 中国原子能科学研究院 | 钠冷快堆换料用旋转定位装置 |
-
2010
- 2010-10-22 FR FR1058641A patent/FR2966638B1/fr not_active Expired - Fee Related
-
2011
- 2011-08-31 EP EP11749198.5A patent/EP2630645A1/fr not_active Withdrawn
- 2011-08-31 RU RU2013123366/07A patent/RU2013123366A/ru not_active Application Discontinuation
- 2011-08-31 WO PCT/EP2011/064949 patent/WO2012052213A1/fr active Application Filing
- 2011-08-31 US US13/879,797 patent/US20130315363A1/en not_active Abandoned
- 2011-08-31 KR KR1020137012546A patent/KR20130140008A/ko not_active Application Discontinuation
- 2011-08-31 JP JP2013534219A patent/JP2013541714A/ja not_active Withdrawn
- 2011-08-31 CN CN2011800503804A patent/CN103180911A/zh active Pending
Non-Patent Citations (1)
Title |
---|
See references of WO2012052213A1 * |
Also Published As
Publication number | Publication date |
---|---|
US20130315363A1 (en) | 2013-11-28 |
RU2013123366A (ru) | 2014-11-27 |
FR2966638A1 (fr) | 2012-04-27 |
CN103180911A (zh) | 2013-06-26 |
JP2013541714A (ja) | 2013-11-14 |
KR20130140008A (ko) | 2013-12-23 |
WO2012052213A1 (fr) | 2012-04-26 |
FR2966638B1 (fr) | 2012-12-28 |
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