Abstract: Proposed is a cutting apparatus for a fuel basket accommodating spent nuclear fuel of a heavy water reactor, wherein the apparatus includes a base, a vertical support arranged on one side of the base; a turn table arranged to be reciprocated between one side and an opposite side of the base and be horizontally rotatable on the base; a horizontal support arranged to extend from an upper-end of the vertical support in a horizontal direction toward the turn table; a side-cutting means arranged on the vertical support protruding toward the turn table for cutting a side welding bead of the fuel basket mounted on the turn table; and an upper-cutting means arranged on the horizontal support protruding toward the turn table for cutting an upper welding bead of the fuel basket mounted on the turn table.

Abstract: The objective of one aspect of the present invention is to provide a high-hardness steel sheet and a manufacturing method, the high-hardness steel sheet having Brinell hardness of 500 HB or more by setting a steel composition according to a minimum carbon content relation (1). C (minimum carbon (c)content)?0.481-0.104 Mn-0.035Si-0.088Cr-0.054Ni-0.035Mo-0.0003C.R.??[Relation 1] (wherein Mn, Si, Cr, Ni and Mo are a value representing the content of each element by wt %, and C.R. is a value represent cooling rate during cooling a hot rolled steel sheet and the unit thereof is ° C.