CUTTING MACHINE OF CAISSONS WITH DEFECTIVE IRRADIATED FUEL ASSEMBLIES Russian patent published in 2014 - IPC G21F9/34 

FIELD: power industry.

SUBSTANCE: objective of the proposed technical solution of the device is creation of a special machine for cutting of a hole of large diameter in a thick-wall tube sheet around the caisson using technological machining methods under conditions of high embedded depth and narrowness of a cutout. The machine is equipped with a cutting tool rotation and vertical supply mechanism, as well as a moving platform. The machine is equipped with a horizontal supply mechanism and installed on guide posts arranged on the moving platform. A fixed support of the machine, at the end of which there is a conical cavity made coaxially to rotation axis of the cutting tool and into which a semi-spherical projection of a centring head, in the centre of which there is a blind hole, is installed on the caisson end face with its location along its inner diameter and is spring-loaded from below.

EFFECT: improving centring accuracy of a machine relative to a caisson being cut, reducing the time of guidance of a cutting tool and reducing dose loads on operating personnel and minimising radioactive emissions to environment.

5 dwg