Abstract:
A passive nuclear reactor control device. The passive nuclear reactor control device comprises a sealed chamber, which comprises a reservoir and a tube in fluid communication with the reservoir. A molten salt is within the sealed chamber, the molten salt being a eutectic mixture of a monovalent metal halide, and a fluoride or chloride of one or more lanthanides and/or a luoride or chloride of hafnium. A gas is within the sealed chamber, and the gas does not react with the molten salt.
Abstract:
Изобретение относится к системам защиты ядерных реакторов и может быть использовано при создании ядерных реакторов, в частности, реакторов на быстрых нейтронах. Технический результат изобретения состоит в расширении функциональных возможностей устройства пассивного ввода отрицательной реактивности за счет обеспечения его надежного срабатывания в различных аварийных режимах. Устройство выполнено в виде двух емкостей, расположенных в общем кожухе одна под другой, между емкостями и кожухом сформирована кольцевая полость для протока теплоносителя. В кольцевой полости размещены твэлы, а также средства для формирования потоков теплоносителя для охлаждения твэлов и для нагрева верхней емкости. Верхняя емкость расположена выше активной зоны реактора и разделена внутренней перегородкой на центральную цилиндрическую и кольцевую полости. Перегородка выполнена с низкой теплопроводностью в поперечном направлении. В центральной полости верхней емкости преимущественно размещен изотоп кадмия, а в кольцевой ее полости - ртуть. Нижняя емкость размещена, преимущественно, в активной зоне реактора и заполнена инертным газом. Емкости соединены между собой трубой с перегородкой, выполненной в виде хлопающей предохранительной мембраны.
Abstract:
Equipo portátil de boración de aguas en flujo continuo automatizado y transportable en un contendedor; que no requiere la presencia de un operador durante su funcionamiento una vez se ha cargado el ácido bórico en el equipo; que comprende un conjunto de líneas de entrada y de salida que permiten dotar de agua borada a varios consumidores, permitiendo también un suministro combinado de agua bruta/agua borada; y que permite ajustar de forma automática el caudal, concentración, temperatura, y salida del agua borada suministrada
Abstract:
Implementations of a nuclear reactor system include a passive boron injection system operable to release an amount of boron into a containment vessel sufficient to shut down a nuclear fission reaction or maintain the nuclear fission reaction in a sub-critical state. Implementations of a nuclear reactor system include a reactor module that is free of any control rod assemblies. Implementations of a nuclear reactor system include a reactor module that includes a control rod assembly system that is operable to position control rod assemblies in only two discrete positions.
Abstract:
A mobile boration system (60) has a number of components that are mobile and include a water source (10), H 2 B0 3 powder supply (14), a mixer to mix the solution (20) capable of providing a boric acid solution (30) with minimal air entrainment and optional heat exchanger(s) (12), and wherein the system (60) is capable of transport to a nuclear power plant facility by land, sea or air, rather than being in place in a large vulnerable footprint.
Abstract:
A method of fabricating a liquid-metal coolant includes adding nanoparticles to the liquid-metal coolant to change neutronic properties of the liquid-metal coolant. The nanoparticles have neutronic properties different from that of the iiquid-metal coolant.
Abstract:
Illustrative apparatuses, assemblies, and methods for controlling reactivity in a nuclear fission reactor are disclosed, illustrative nuclear fission reactors are disclosed, and illustrative methods for fabricating a reactivity control apparatus are disclosed.
Abstract:
The systems for mounting, controlling and guiding the control rods inside and outside the reactor vessel can be dispensed with and traversing the internal upper part can thus be avoided. According to the invention, an internal upper part (10) which is placed close to the core of the reactor (50) is used, said part leading laterally to the exterior of the vessel (1). All fluid transmission and control systems pass via said internal part and, due to a moveable connection part (11) for each cluster of control rods, and lead to an assembly head (12) containing reservoirs of neutron-absorbing liquid and injection circuits in injection channels placed between the fuel rods. The invention can be used in all nuclear reactors.
Abstract:
A heat-exchanger designed as a plate heat-exchanger (3) is useful for stabilizing the natural circulation in, and diluting, a coolant circuit in which vapour is formed. The spaces between the plates are subdivided by sealing elements into channels in which vapour is formed as a result of a pressure drop. The pressure drop is governed both by the static head and by the flow resistance in the channels. A powerful current which is driven by the vapour formation in function of the power of the heat source and which drives the natural circulation is established in the individual channels.