摘要:
The invention relates to nuclear power industry, namely to systems providing safety of nuclear power plants (NPP), and can be used during severe accidents leading to reactor vessel and NPP containment failure. The melt cooling and confinement system includes a cone-shaped guide plate installed under the reactor vessel bottom, cantilever girder installed under the guide plate and supporting the same, core catcher installed under the cantilever girder and equipped with cooled cladding in form of a multi-layer vessel for protection of the external heat-exchange wall from dynamic, thermal and chemical impacts, and filler material for melt dilution inside the multi-layer vessel. The said multi-layer vessel contains internal and external metal layers with an intermediate layer in the form of a non-metal filler located in between. Bearing ribs are installed between the internal and external layers at an azimuth pitch (S pitch ) that meets the following criterion: d ext /15 pitch ext /5, where d ext is external diameter of the vessel. The technical result of the invention is the increased efficiency of heat removal from the melt and improved structural reliability.
摘要:
A nuclear reactor vessel structure includes an inner peripheral tube-shaped steel plate (4), an outer peripheral tube-shaped steel plate (6), and an intermediate tube-shaped steel plate (5) disposed between the inner and outer peripheral tube-shaped steel plates (4, 6), and is configured to support a nuclear reactor vessel (3) on the inner peripheral side of a tube-shaped structure (2) with concrete (C1, C2) placed between the steel plates. The nuclear reactor vessel structure (1) includes a support (14) having a tube-shaped plate (12) disposed on the inner peripheral side of the intermediate tube-shaped steel plate (5), and an annular plate (13) which protrudes to the inner peripheral side of the tube-shaped plate (12) and to which a radial support key (connection section) (7) connected to the nuclear reactor vessel (3) is affixed. The support (14) is affixed to the concrete (C1), which is placed between the inner peripheral tube-shaped steel plate (4) and the intermediate tube-shaped steel plate (5), by foundation bolts (first bar members) (15) extending in the vertical direction, and the support (14) is also affixed to the inner peripheral tube-shaped steel plate (4) by anchor bolts (second bar members) (16) extending in the radial direction of the tube-shaped structure (2).
摘要:
A combined makeup tank and passive residual heat removal system that places a tube and shell heat exchanger within the core makeup tank. An intake to the tube side of the heat exchanger is connected to the hot leg of the reactor core and the outlet of the tube side is connected to the cold leg of the reactor core. The shell side of the heat exchanger is connected to a separate heat sink through a second heat exchanger.
摘要:
This invention achieves the foregoing objective by providing a pressurized water nuclear reactor having a pressure vessel with a core region for supporting fuel assemblies A core barrel Is removably disposed within the pressure vessel around the core region A core shroud is disposed within the core barrel between the core barrel and the fuel assemblies The core shroud has an alignment slot that orients the core shroud with the core barrel An upper support plate is removably disposed above the fuel assemblies and the core shroud The upper core support plate also has an alignment slot for aligning the upper core support plate with the core barrel and the core shroud An alignment plate Is attached to the core barrel and is disposed within the alignment slot of the core shroud and within the alignment slot of the upper core support plate to maintain alignment
摘要:
A nuclear reactor includes a reactor pressure vessel 12 and a core barrel 14, contained within the reactor pressure vessel 12. The reactor 10 further includes a single vertical support 16, for transmitting vertical load from the core barrel to the reactor pressure vessel. Further, lateral support means is provided at an elevation which is above that of the support 16 to provide lateral support to the core barrel 14. This arrangement will result in reduced stress arising from the temperature fluctuations.
摘要:
A nuclear reactor includes a reactor pressure vessel (12) and a core barrel (14), contained within the reactor pressure vessel (12). The reactor (10) further includes a single vertical support (16), for transmitting vertical load from the core barrel to the reactor pressure vessel. Further, lateral support means is provided at an elevation which is above that of the support (16) to provide lateral support to the core barrel (14). This arrangement will result in reduced stress arising from the temperature fluctuations.
摘要:
A liquid metal cooled nuclear reactor (10) having a passive cooling system for removing residual heat resulting for fuel decay during reactor shutdown, or heat produced during a mishap. The reactor system is enhanced with sealing means (48) for excluding external air from contact with the liquid metal coolant (20) leaking from the reactor vessel during an accident. The invention also includes a silo structure (24) which resists attack by leaking liquid metal coolant, and an added unique cooling means.
摘要:
A nuclear reactor with a reactor unit, comprising a reactor core with fuel assemblies (60) and flow-controlling parts. The reactor unit is included in a circulation system, containing a diffuser for water with a low content of neutron absorber during normal operation. The reactor unit is further arranged in a pool with water with a higher content of neutron absorber than the water in the circulation system. The water in the pool and the water in the circulation system is adapted, during normal operation, to form interfaces in density locks arranged at different levels in the reactor unit, and the water in the pool is adapted, upon shutdown of the reactor, to penetrate into the reactor unit via the density locks. According to the invention one or more diffusers (67) are arranged with an at least substantially vertical symmetry axis below each one of at least a plurality of the fuel assemblies of the rector core. The arrangement of the diffusers makes them easily accessible for exchange and for adjustment of dimensions. The use of several diffusers below each fuel assemblies allows the height of the reactor to be reduced.
摘要:
Modular liquid metal reactor having its functional components arranged in separate satellite tanks (6). The interconnection (9)(11) of these satellite tanks allows a free convection circulation of coolant. Thermal transients are damped down by coolant capacity in the satellite tanks.
摘要:
La paroi mince (10a) de l'appareil à supportter est munie localement d'une bague annulaire (21) relativement peu épaisse et comportant en partie médiane une gorge circulaire (22) dans laquelle pénètre les extrémités (23a) de leviers de suspension (23) articulés et régulièrement répartis autour de l'appareil, lesdits leviers de suspension (23) étant d'une part munis, du côté de la gorge (22), de tourillons latéraux (33) s'engageant dans des pièces (34) encastrées dans ladite gorge (22) et d'autre part suspendus chacun à un système à parallèlogrammes (24, 27, 28) en appui sur une structure fixe (5).