公开(公告)号：US3888732A

公开(公告)日：1975-06-10

申请号：US39730273

申请日：1973-09-14

Applicant: ASEA AB

Inventor： BERGLUND AKE ,  SUVANTO ANTTI ,  TORNBLOM LARS

IPC: G21C3/322 ,  G21C15/02

CPC classification number: G21C3/322 ,  Y02E30/38

Abstract: In a nuclear reactor with vertically arranged fuel assemblies positioned on supporting members and with control rods displaceably arranged in guide tubes between the fuel rods inside the fuel assemblies, the supporting plate is provided with a transverse end piece with throttling means for the liquid flow which passes from below up through the supporting member and past the fuel rods in the fuel assembly. The inlets for the guide tubes for the control rods are located below the end piece and the throttling means. In this way a higher pressure prevails at the inlet to the guide tubes than above the end piece, so that a stronger flow of coolant is produced through guide tubes than through the fuel assembly.

公开(公告)号：US3697375A

公开(公告)日：1972-10-10

申请号：US3697375D

申请日：1969-01-24

Applicant: ASEA AB

Inventor： SUVANTO ANTTI ,  SANTEN AART VAN

IPC: G21C3/12 ,  G21C3/14 ,  G21C3/33 ,  G21C3/32

CPC classification number: G21C3/3315 ,  G21C3/12 ,  G21C3/14 ,  Y02E30/40

Abstract: In a fuel assembly for insertion from above into a nuclear reactor core a fuel rod bundle is arranged as a freely moveable loose insert in a weight carrying square sheathing tube, which has at its upper end connection members such as two diametrically opposed lifting lugs permitting a grab member in a lifting device to grab the sheathing tube for lifting the entire fuel assembly. The upper part of the sheathing tube is formed as it springs supporting the fuel assembly laterally against an upper core grid and supporting the fuel rod bundle laterally against the sheathing tube wall.