FIXING DEVICE FOR HANDLING SPENT NUCLEAR FUEL ASSEMBLY AND METHOD FOR INSTALLING SAME

The present invention relates to a fixing device for handling a spent nuclear fuel assembly and a method for installing same, wherein a guide tube and an upper-end fixing body of the spent nuclear fuel assembly can be fixed so as to improve structural reliability. The fixing device according to the present invention comprises: a housing (100) comprising multiple free end portions (110) divided by slots (111) to be able to elastically deform in the radial direction, the slots (111) being formed by incising a hollow cylindrical body (101) from the front end of one side thereof in the longitudinal direction over a predetermined range (L), the housing (100) comprising stopper protrusions (120) formed to protrude from respective front ends of the free end portions (110) in the radial direction, the housing (100) comprising a first male thread (131) formed on the outer peripheral surface of the rear end of the cylindrical body (101), the housing (100) comprising a female thread (132) formed on the inner peripheral surface of the rear end of the cylindrical body (101); a rod portion (200) comprising a pressurization protrusion (210) having a length larger than that of the housing (100) and having an outer diameter (D6) larger than the inner diameter (D5) of the free end portions (110), the rod portion (200) having a second male thread (220) formed on the rear end thereof and screw-assembled with the female thread (132) such that the rod portion (200) is screw-assembled with the housing (100); and fixing members (310) (320) screw-assembled with the first male thread (131) of the housing (100) so as to fix the housing (100) to the nuclear fuel assembly. La présente invention concerne un dispositif de fixation pour manipuler un assemblage de combustible nucléaire usé et son procédé d'installation, un tube de guidage et un corps de fixation d'extrémité supérieure de l'assemblage de combustible nucléaire usé pouvant être fixés de façon à en améliorer la fiabilité structurelle. Le dispositif de fixation selon la présente invention comprend : un boîtier (100) comprenant de multiples parties d'extrémité libre (110) séparées par des fentes (111) pour pouvoir se déformer élastiquement dans la direction radiale, les fentes (111) étant formées par incision d'un corps cylindrique creux (101) à partir de l'extrémité avant d'un côté de celui-ci dans la direction longitudinale sur une plage prédéterminée (L), le boîtier (100) comprenant des saillies de butée (120) formées pour f