公开(公告)号：US3733250A

公开(公告)日：1973-05-15

申请号：US3733250D

申请日：1969-12-01

Applicant: ASEA AB

Inventor： VAN SANTEN A ,  ELOFSSON K

IPC: G21C3/326 ,  G21C3/335 ,  G21C19/10 ,  G21C19/20

CPC classification number: G21C19/10 ,  G21C3/326 ,  G21C3/335 ,  G21C19/205 ,  Y02E30/38 ,  Y10S294/906

Abstract: A nuclear reactor formed of fuel assemblies each including a plurality of parallel fuel rods arranged in a predetermined fuel rod lattice, which rods are freely extractable and insertable at one end of the fuel assembly, is refueled by extracting from one of the fuel assemblies a number of fuel rods substantially less than the total number of fuel rods and replacing these by inserting new fuel rods into the vacated positions. This is done for a majority of fuel assemblies of the reactor. At the next refueling operation different fuel rods from those previously replaced are removed and replaced. The removal and return of the rods is produced by a tool having a plurality of gripping members capable of engaging shoulder beneath head formed on the upper ends of the fuel rods. This may be accomplished by providing a tool having a numbers of gripping members attached to the tool body corresponding to the lattice positions of the fuel rods to be extracted, having gripping members which can be pushed together to grip beneath shoulders on the upper ends of the fuel rods.

公开(公告)号：US3713971A

公开(公告)日：1973-01-30

申请号：US3713971D

申请日：1969-12-01

Applicant: ASEA AB

Inventor： VAN SANTEN A ,  SODERGARD B

IPC: G21C7/14 ,  G21C1/08 ,  G21C3/30 ,  G21C3/326 ,  G21C3/344 ,  G21C5/00 ,  G21C7/10 ,  G21C7/12 ,  G21C19/115 ,  G21C15/00

CPC classification number: G21C3/326 ,  G21C1/08 ,  G21C3/344 ,  G21C7/10 ,  G21C7/12 ,  G21C19/115 ,  G21Y2002/304 ,  G21Y2004/30 ,  Y02E30/38 ,  Y02E30/39

Abstract: A nuclear reactor includes a reactor core and a pressure vessel surrounding the reactor core. A plurality of tubes pass through the bottom part of the vessel and extend towards the core. These tubes have upper ends forming guide tubes for control rods. The core is formed of a plurality of core units each comprising a fuel assembly and a rod movable in one of the control rod guide tubes. The fuel assemblies are substantially polygonal in cross section and are arranged in a polygonal lattice. Each of the fuel assemblies rests on a separate control rod guide tube. The fuel assemblies are arranged close together with at most only a small gap between them and are laterally supported by the adjacent fuel assemblies and the control rod guide tubes.

Abstract translation: 核反应堆包括反应堆堆芯和围绕反应堆堆芯的压力容器。 多个管穿过容器的底部并朝着芯延伸。 这些管具有用于控制棒的上端形成导向管。 芯由多个芯单元形成，每个芯单元包括可在一个控制杆导管中移动的燃料组件和杆。 燃料组件的横截面基本上是多边形，并且以多角形格架布置。 每个燃料组件搁置在单独的控制杆导管上。 燃料组件最靠近地布置在它们之间的最小的间隙处，并且被相邻的燃料组件和控制杆导向管横向支撑。