Abstract

The invention relates to a nuclear reactor core arrangement, comprising a core (6) formed of fuel assemblies (600) comprising fuel plates or rods arranged in the core parallel to a first direction (A) which constitutes a vertical direction for introducing the core into a cylindrical vessel (9) having a vertical axis of revolution (Z), the assemblies being separated by spaces for accommodating control rods (601) which are accommodated between the assemblies (600), and by passages for a heat-transfer liquid parallel to the first direction, around the fuel plates or rods, the arrangement comprising a basket (60) for supporting the core (6), provided with a first perforated plate (75) which is provided with holes (76) for the passage of the heat-transfer liquid, is arranged in a plane perpendicular to the first direction under a lower face of the core, and is intended to support the core when it is placed in the reactor vessel and when it is handled, the basket comprising lateral uprights extending along the lateral faces of the core and extending in the first direction above the core, and a second perforated plate (70) covering an upper face of the core and provided with holes for the passage of the heat-transfer liquid and cross-shaped slots for the passage of the control rods (601).

IPC Classes  ?

• G21C 1/08 - Heterogeneous reactors, i.e. in which fuel and moderator are separated moderator being highly pressurised, e.g. boiling-water reactor, integral-superheat reactor, pressurised-water reactor
• G21C 3/322 - Means to influence the coolant flow through or around the bundles
• G21C 5/06 - Means for locating or supporting fuel elements
• G21C 7/113 - Control elements made of flat elementsControl elements having cruciform cross-section
• G21C 15/18 - Emergency cooling arrangementsRemoving shut-down heat
• G21D 1/00 - Details of nuclear power plant
• G21D 9/00 - Arrangements to provide heat for purposes other than conversion into power, e.g. for heating buildings

Abstract

The invention relates to a safety system for a nuclear facility, comprising a reactor hall (4) provided with a nuclear reactor (1) in a cooling pool (3) of said reactor, characterised in that it comprises a ventilation system, for adjusting the ambient conditions of technical rooms and of the reactor hall and for filtration to protect the environment from gaseous radioactive waste. The system is provided with: a. at least one air inlet (201a) having a variable cross-section in a wall of a building (10), the air inlet opening into an intake treatment room (201) provided with a first air outlet (201b) into the reactor hall; b. a water/air exchanger (5) in the pool, comprising an inlet duct (5a) open in the reactor hall (4); c. an air outlet duct (5b) of the exchanger (5), the duct being suitable for supplying the air leaving the water/air exchanger to an outlet filtration device (203) in communication with a flue (210); d. at least one extractor (202) arranged at the outlet of the air outlet duct (5b) in a room comprising the outlet filtration device (203), and for which, when the extractor is at a standstill, the water/air exchanger and the cross-section of the at least one air inlet (201a) are configured so that, when the reactor is at a standstill, the rise in the temperature of the water in the pool heats the air in the exchanger relative to the outside temperature at the flue outlet and creates an air flow that sucks the outside air at the air inlet in order to eject it at the outlet of the flue through the filtration device (203).

IPC Classes  ?

• G21C 13/02 - Pressure vesselsContainment vesselsContainment in general Details
• G21C 13/10 - Means for preventing contamination in event of leakage
• G21C 19/303 - Arrangements for introducing fluent material into the reactor coreArrangements for removing fluent material from the reactor core with continuous purification of circulating fluent material, e.g. by extraction of fission products specially adapted for gases
• G21C 1/32 - Integral reactors, i.e. reactors wherein parts functionally associated with the reactor but not essential to the reaction, e.g. heat exchangers, are disposed inside the enclosure with the core
• G21C 15/18 - Emergency cooling arrangementsRemoving shut-down heat
• G21C 15/26 - Promoting flow of the coolant by convection, e.g. using chimneys, using divergent channels
• G21D 3/06 - Safety arrangements responsive to faults within the plant
• G21D 9/00 - Arrangements to provide heat for purposes other than conversion into power, e.g. for heating buildings

Abstract

The invention relates to a nuclear reactor provided with a nuclear core (6), arranged on a support (6a) in a bottom of a cylindrical vessel (9) oriented along a vertical axis, filled with a heat-transfer liquid, in particular water, under an upper dome of the vessel, comprising an annular primary exchanger (91) surrounding a flue (9a) for installing and extracting the core, the exchanger starting above the core, extending along the cylindrical wall of the vessel under the dome, and comprising a primary circuit consisting of the heat-transfer liquid circulating in the core and in the primary exchanger by convection, for which a first part of the cylindrical wall (94) of the vessel (9) is surrounded by a first annular casing (1a) forming a cold plenum (83) in communication with an inlet (91a) of a secondary circuit of the exchanger (91) in the lower part of the exchanger and extending from the bottom of the vessel to below an outlet (91b) of the primary exchanger. A second part of the cylindrical wall is surrounded by a second annular casing (1b), above the first annular casing (1a), forming a hot plenum in communication with the outlet (91b) of the secondary circuit of the exchanger (91) in the upper part of the exchanger, an intermediate heat extraction circuit comprising a first pipe (81), for the inflow of cold heat-transfer liquid, opening out in the upper part of the first casing (1a), while a second starting pipe for hot heat-transfer liquid exits in the upper part of the second casing (1b).

IPC Classes  ?

• G21C 1/32 - Integral reactors, i.e. reactors wherein parts functionally associated with the reactor but not essential to the reaction, e.g. heat exchangers, are disposed inside the enclosure with the core
• G21C 15/18 - Emergency cooling arrangementsRemoving shut-down heat
• G21C 15/26 - Promoting flow of the coolant by convection, e.g. using chimneys, using divergent channels
• G21D 3/06 - Safety arrangements responsive to faults within the plant
• G21D 9/00 - Arrangements to provide heat for purposes other than conversion into power, e.g. for heating buildings
• G21C 13/02 - Pressure vesselsContainment vesselsContainment in general Details
• G21C 13/10 - Means for preventing contamination in event of leakage
• G21C 19/303 - Arrangements for introducing fluent material into the reactor coreArrangements for removing fluent material from the reactor core with continuous purification of circulating fluent material, e.g. by extraction of fission products specially adapted for gases

Goods & Services

Nuclear installations; heating installations; nuclear installations for heat generation; installations for processing nuclear fuel and nuclear moderating material; apparatus for heating, steam generation, heat exchange, heat and steam accumulation, heat and steam regulation. Hot and cold fluid distribution; heat and cold supply; heat and cold distribution; nuclear energy supply for heating and cooling urban networks; hot and cold fluid distribution; heat and cold supply; heat and cold distribution; nuclear energy supply for heating and cooling urban networks. Technical design services; technical project studies; engineering services; nuclear engineering services; nuclear material testing; providing expertise, reports, studies, analyses and development of engineering concepts and pre-projects, particularly in the field of nuclear, energy, environmental and safety techniques; quality control and monitoring in the nuclear field; advice, expert reports and materials testing in the field of nuclear energy; services for monitoring and controlling computer systems for detecting breakdowns of nuclear installations; engineering relating to hot and cold fluid production and distribution networks and to the equipment of such networks; surveying, in particular diagnosing hot and cold fluid production and distribution networks; technical design, development and planning of heating installations.

Goods & Services

(1) Installations de chauffe, nommément installations d'énergie thermique pour le chauffage, radiateurs de chauffage; installations nucléaires pour la production de chaleur, nommément générateurs nucléaires, réacteurs nucléaires; installations pour le traitement de combustibles et modérateurs nucléaires; appareils électriques de chauffage par radiant à usage domestique; installations de production de vapeur; appareils d'échange de chaleur, nommément échangeurs thermiques autres que parties de machines; accumulateurs de chaleur; accumulateurs de vapeur; régulateurs de chaleur en tant que parties d'installations de chauffage; purgeurs non automatiques pour installations de chauffage à vapeur. (1) Distribution de fluides chauds et froids, nommément services d'utilité publique consistant en la distribution d'eau chaude et froide; distribution de chaleur et de froid, nommément distribution d'énergie thermique aux utilisateurs résidentiels et commerciaux, distribution de chauffage urbain. (2) Services de conception technique, nommément conception de composants et d'équipements pour générateurs nucléaires et réacteurs nucléaires; réalisation d'études de projets techniques dans le domaine de l'énergie nucléaire; services d'ingénierie dans le domaine des projets d'énergie nucléaire; services d'ingénierie nucléaires; essai de matériel nucléaire; réalisation d'expertises, de rapports, d'études, d'analyses et élaboration de concepts et d'avant-projets d'ingénierie dans le domaine des techniques utilisées dans le domaine de la production d'énergie nucléaires, leur impact environnemental et la sécurité au travail dans les centrales nucléaires; contrôle et surveillance de la qualité dans le domaine de la production d'énergie nucléaire; conseils, expertise et essais de matériaux dans le domaine de l'énergie nucléaire; services de surveillance et de contrôle de systèmes informatiques pour la détection de pannes des installations nucléaires; ingénierie afférente aux réseaux de chauffage urbain par la production et de distribution de fluides chauds et froids et aux équipements de réseaux de chauffage urbain; prestations d'expertise, nommément diagnostic de panne de réseaux de chauffage urbain par la production et de distribution de fluides chauds et froids; conception, développement et planification techniques d'installations de chauffage.