摘要:
The present invention relates to a fast neutron reactor comprising a main vessel (100) containing: - a core (4) made up of fuel assemblies (22) that can be cooled by a coolant (25), - means (6) of supporting the said core (4), - a coolant pump (7) for circulating the said coolant (25) in the said main vessel (100), the said reactor being characterized in that the said core support means (6) comprise a first orifice (15) for the passage of the said pump (7) so that the said pump (7) delivers the said coolant (25) into the said support means (6).
摘要:
Micro neutron detectors (30) include relatively small pockets (38) of gas (40) including a neutron reactive material (42). During use, under a voltage bias in a neutron environment, neutron interactions in the neutron reactive material are seen to occur, electron-ion pairs form and positive ions and electrons drift to the cathode and anode, respectively, thus producing a measurable current indicating the presence of neutrons. Preferred pocket volumes range from a few cubic microns to about 1200 cubic millimeters; neutron-reactive materials include fissionable, fertile or fissile materials (or combinations) such as 235U, 238U, 233U, 232Th, 239Pu, 10 B, 6Li and 6LiF; gases includes one or more of argon, P-10, 3He, BF3, BF3, CO2, Xe, C4H10, CH4, C2H6, CF4, C3H8, dimethyl ether, C3H6 and C3H8. Arrangements include two- and three-piece sections, arrays, and/or capillary channels.
摘要:
The present invention includes a nuclear fission reactor apparatus comprising a core open to an atmosphere containing a hydrogen or a hydrogen isotope material, said core consisting essentially of a powdered fissile metal hydride material that remains entirely within said core; a plurality of trays outside said core that store a non-fissile material thereon wherein said non-fissile material absorbs and desorbs said hydrogen isotope material based on said core's temperature; a means for heating and cooling said plurality of trays; and a means for extracting energy produced in said core.
摘要:
L'invention a pour objet un procédé de détermination (30) de la distribution de puissance volumique du cœur d'un réacteur nucléaire en utilisant un en- semble de détecteurs de mesure de flux neutronique disposés à l'extérieur de la cuve du réacteur et un ensemble de sondes de mesure de la tempéra- ture du caloporteur à la sortie des assemblages combustibles. Le procédé (30) comporte une étape de détermination d'une première distribution de puissance volumique en utilisant un code de calcul neutronique (40) résolvant instantanément l'équation de la diffusion et actualisant le bilan isotopique du cœur au cours de l'épuisement du combustible, à partir de valeurs de para- mètres de fonctionnement du réacteur, et une étape de détermination d'une nouvelle distribution de puissance volumique par ajustement (60) et (90) de la première distribution de puissance volumique avec des mesures délivrées par les détecteurs de mesure de flux neutronique disposés à l'extérieur de la cuve du réacteur 80 et les sondes de mesure de température (100).
摘要:
A nuclear reactor (1) is provided, in particular a nuclear reactor cooled with a liquid metal (for example, a heavy liquid metal, such as lead or lead-bismuth eutectic), of the type having a cylindrical inner vessel (15) that divides a hot collector (6) over a core (4) from a substantially annular cold collector (7) surrounding the hot collector; housed in the cold collector (7) is a plurality of integrated circulation and heat-exchange assemblies (20), each of which includes a pump (9), two heat exchangers (10) set at the sides of the pump, and a conveying structure (21) through which a primary fluid (8) for cooling the core passes from the pump to the heat exchanger, all of which are fixedly connected to one another to form a unitary structure; each integrated assembly has an inlet (26) connected to the hot collector (6) and two outlet sections (34) in the cold collector (7).
摘要:
A trash rack for an emergency core cooling system of a nuclear power plant comprises at least one wire-mesh upright screen for filtering debris from coolant flowing in the cooling system. The upright screen is mounted in the coolant flow path with its bottom edge on the floor of an area forming part of the cooling system and a top edge is disposed above the floor at a height less than the level to which the coolant can be expected to rise during a loss of cooling accident. The trash rack also uniquely includes a wire-mesh roof screen that has a downstream edge mated with the top edge of the upright screen and extending upstream thereof to an upstream end spaced from the floor, thereby presenting an unobstructed opening between the floor and the upstream edge of the roof screen.
摘要:
The invention concerns a system suited for carrying out eddy current measurements on components (10) for nuclear reactors when these components (10) are located in water (12). The system comprises a control unit (14), a measurement probe (16) and a first cable (21 ) suited to constitute at least a part of the connection between the control unit (14) and the measurement probe (16). The system also comprises a switching unit (25), suited to be located in water (12) and arranged to be connected with said first cable (21 ), and to be connected with the measurement probe (16). The switching unit (25) has a switching device (27) which can assume at least a first and a second state. In the first state, the first cable (21 ) is connected with the measurement probe (16). In the second state, the first cable (21 ) is not connected with the measurement probe (16). The invention also concerns the use of the system.
摘要:
Micro neutron detectors include relatively small pockets of gas including a neutron reactive material. During use, under a voltage bias in a neutron environment, neutron interactions in the neutron reactive material are seen to occur. Ultimately, electron-ion pairs form and positive ions drift to a cathode and electrons to the anode. The motion of charges then produces an induced current that is sensed and measurable, thereby indicating the presence of neutrons. Preferred pocket volumes range from a few cubic microns to about 1200 mm 3 ; neutron reactive materials include fissionable, fertile or fissile material (or combinations), such as 235 U , 238 U , 233 U, 232 Th, 239 Pu, 10 B, 6 Li and 6 LiF; gasses include one or more of argon, P-10, 3 He, BF 3 , BF 3 , CO 2 , Xe, C 4 H 10 , CH 4 , C 2 H 6 , CF 4 , C 3 H 8 , dimethyl ether, C 3 H 6 and C 3 H 8 . Arrangements include two- and three-piece sections, arrays (including or not triads capable of performing multiple detecting functions) and/or capillary channels.
摘要:
Um eine Strahlenschutzmaske aus mindestens einem zur Folie ausgewalzten elastomeren Matrixmaterial in das als bleifreie strahlungsabsorbierende Materialien Elemente mit einer Ordnungszahl grösser 50 oder deren Verbindungen eingearbeitet sind, so weiter zu bilden, dass ein sicherer Schutz empfindlicher Körperpartien gegen ionisierende Strahlung ermöglicht wird, und dass weiter sie einfach anwendbar, sterilisierbar sowie recycelbar sein soll, wird vorgeschlagen, dass das in Form geschnittene, mit strahlungsabsorbierenden Materialien versetzte Matrixmaterial is als zumindest eine Folie (2) in eine Hülle (5) aus zwei Blättern (11, 12) eingelegt ist, deren Ränder bis auf einen Bereich zum Einführen und Entnehmen des Matrixmaterials vorzugsweise durch ein Verschweisse oder ein Vernähen (13) miteinander verbunden sind, wobei als Strahlungsabsorber Bismut und/oder Antimon vorgesehen ist, dem auch als weiterer Zusatz Wolfram und/oder seltene Erden z.B. Gadolinium oder Cer und/oder Zinn elementar oder in Verbindung eingesetzt ist/sind.
摘要:
A thin, light-weight, flexible sheet product useful for the manufacture of radiation attenuation garments. The sheet product is a polymeric material and includes a heavy loading of high molecular weight metal particles. The sheet product is formed from a polymer latex dispersion into which a high molecular weight metal particles are dispersed, where the latex retains a sufficiently low viscosity to be pourable and allow casting of the sheet product.