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公开(公告)号：US11373764B2
公开(公告)日：2022-06-28
申请号：US16330487
申请日：2017-02-20
发明人： Sture Helmersson , Jeremy King
摘要： A fuel assembly for a nuclear reactor having an upstream minor portion defining an upstream end, a main portion, and a downstream minor portion defining a downstream end. Fuel rods extend in a flow interspace permitting a flow of coolant through the fuel assembly in contact with the fuel rods. Two elongated tubes form a respective internal passage extending in parallel with the fuel rods and enclosing a stream of the coolant. Each elongated tube having a bottom, an inlet at the upstream minor portion and an outlet at the downstream minor portion. Each elongated tube having an inlet pipe having an inlet end and an outlet end in the internal passage at a distance from the bottom, thereby forming a space in the internal passage between the outlet end and the bottom.
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公开(公告)号：US20220172851A1
公开(公告)日：2022-06-02
申请号：US17436320
申请日：2020-03-11
发明人： Uffe BERGMANN , Hoshiar AMIN
IPC分类号： G21C3/32
摘要： A filter for separating particles from a cooling liquid in a nuclear plant is presented. The filter includes at least one passage with an inner surface, an inlet end and an outlet end, wherein the at least one passage is arranged to permit through-flow of the cooling liquid in a main flow direction (MFD) from the inlet end to the outlet end. The inner surface of the at least one passage includes at least one surface section having a structured surface forming a plurality of surface portions facing the main flow direction (MFD) of the cooling liquid and being arranged to catch the particles. Also, a fuel assembly for a nuclear plant, including a filter is presented.
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公开(公告)号：US20210272709A1
公开(公告)日：2021-09-02
申请号：US17253288
申请日：2019-06-10
IPC分类号： G21C3/04 , C01G43/025 , G21C3/326 , G21C21/02
摘要： A uranium oxide fuel pellet having an inner region and an outer rim region about the inner region, and that the fuel pellet is cylindrical and the inner region and outer rim region are coaxial cylindrical regions. The outer rim region has an excess of oxygen in comparison to the inner region , wherein high burnup structure (HBS) formation will be suppressed or delayed. Preferably, the excess oxygen is obtained by a chemical treatment by immersing the pellet in hydrogen peroxide (H2O2) or potassium permanganate (KMnO4) in solution.
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公开(公告)号：US20190198183A1
公开(公告)日：2019-06-27
申请号：US16330496
申请日：2017-02-20
IPC分类号： G21C3/32 , G21C19/307
CPC分类号： G21C3/3206 , G21C3/3305 , G21C19/307 , Y02E30/40
摘要： A fuel assembly for a nuclear water reactor having an upstream end, a downstream end, and a flow interspace between the upstream and downstream ends. Fuel rods are provided in the flow interspace between the upstream and downstream ends. The flow interspace permits a flow of coolant through the fuel assembly along a flow direction from the upstream end to the downstream end. A filter device is provided to catch debris particles in the flow of coolant. The filter device has a first filter zone for a major part of the flow of coolant, and a second filter zone for a minor part of the flow of coolant. The first filter zone has a first filtering efficiency and the second filter zone has a second filtering efficiency. The second filtering efficiency is higher than the first filtering efficiency.
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公开(公告)号：US10269459B2
公开(公告)日：2019-04-23
申请号：US14784858
申请日：2014-03-28
发明人： Mats Dahlbäck , Sture Helmersson
IPC分类号： G21C3/00 , G21C3/04 , G21C3/06 , G21C3/30 , G21C3/32 , G21C3/36 , G21C3/38 , G21C3/322 , G21C3/324 , G21C3/326 , G21C3/334 , G21C3/335 , G21C3/344 , G21C3/348 , G21C3/352
摘要： A fuel channel for a nuclear power boiling water reactor is configured to include a bundle of fuel rods with nuclear fuel. The fuel channel is made of a sheet material and has a plurality of sides which have an elongated shape and which are connected to each other such that a corner with an elongated shape is formed where two adjacent sides meet. In one or more corners, the sheet materials from the two adjacent sides overlap with each other such that there is a corner region with double sheet material consisting of the overlapping sheet material from one of the two sides and the overlapping sheet material from the other of the two sides.
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公开(公告)号：US20180096744A1
公开(公告)日：2018-04-05
申请号：US15552108
申请日：2016-02-10
发明人： Jonas Aurén , Uffe Bergmann
CPC分类号： G21C3/328 , G21C3/322 , G21C2003/3225 , Y02E30/31 , Y02E30/38
摘要： A fuel assembly for a nuclear power boiling water reactor including a fuel channel defining a central fuel channel axis, fuel rods, each having a central fuel rod axis, at least 3 water channels for non-boiling water, each water channel having a central water channel axis and each water channel having a larger cross-sectional area than the cross-sectional area of (the average) fuel rod. The fuel rods include a first group of full length fuel rods and a second group of shorter fuel rods. The fuel assembly comprises 3 or 4 fuel rods which belong to said second group and which are positioned such that the central fuel rod axis of each of these 3 or 4 fuel rods is closer to the central fuel channel axis than any of the water channel axes of the water channels.
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公开(公告)号：US11456083B2
公开(公告)日：2022-09-27
申请号：US16611328
申请日：2018-04-16
发明人： Simon Middleburgh , Mattias Puide
摘要： A nuclear fuel pellet for a nuclear reactor is disclosed. The pellet comprises a metallic matrix and ceramic fuel particles of a fissile material dispersed in the metallic matrix. The metallic matrix is an alloy consisting of the principle elements U, Zr, Nb and Ti, and of possible rest elements. The concentration of each of the principle elements in the metallic matrix is at the most 50 molar-%.
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公开(公告)号：US20220102017A1
公开(公告)日：2022-03-31
申请号：US17422563
申请日：2019-12-18
发明人： Lars-Erik BJERKE , Göran EMBRING , Conny LAMPA , Tell ANDERSSON
IPC分类号： G21C3/07
摘要： A fuel assembly, a fuel rod and a cladding tube for a fuel rod for a nuclear reactor are disclosed. The cladding tube includes a tubular substrate defining an inner space for housing nuclear fuel pellets, and a surface layer applied on the tubular substrate. The tubular substrate is made of a zirconium base alloy and has a first thermal expansion coefficient. The surface layer has an alloy which consists of a major part of main elements comprising Cr and at least one of Nb and Fe, a minor part of zirconium, and possibly a residual part of interstitial elements. The alloy of the surface layer has a second thermal expansion coefficient. The concentrations of the main elements are selected so that the second thermal expansion coefficient is greater than the first thermal expansion coefficient from 20 to at least 1300° C.
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公开(公告)号：US20210125734A1
公开(公告)日：2021-04-29
申请号：US16605413
申请日：2018-03-16
IPC分类号： G21C3/62 , G21C3/42 , G21C3/18 , C04B35/515 , C04B35/58
摘要： A fuel assembly for a nuclear reactor, a fuel rod of the fuel assembly, and a ceramic nuclear fuel pellet of the fuel rod are disclosed. The fuel pellet includes a first fissile material of UB2, The boron of the UB2 is enriched to have a concentration of the isotope 11B that is higher than for natural B.
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公开(公告)号：US20180047466A1
公开(公告)日：2018-02-15
申请号：US15555832
申请日：2015-03-13
发明人： Anders Söderlund , Markus Månsson
摘要： A method of making a fuel channel for a fuel assembly for a nuclear power boiling water reactor includes providing at least one first sheet of a Zr-based material of a first thickness, providing at least one second sheet of a Zr-based material of a second thickness, which is less than said first thickness, assembling at least said at least one first sheet and said at least one second sheet, such that a fuel channel is formed and such that said at least one first sheet forms a lower part of the fuel channel and such that said at least one second sheet forms a higher part of the fuel channel and such that said lower part is joined with said higher part, wherein said lower part constitutes 20-75% of the length of the fuel channel. The invention also concerns a fuel channel and a fuel assembly.
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