2 results about "Nuclear structure" patented technology

To efficiently dispose of in-reactor structures. [Solution] The method for dismantling the upper core structure is a method for dismantling the upper core structure stored in the reactor vessel, and includes the step of cutting at least a part of the upper core structure, which is to be cut, into a plurality of vertical cutting pieces, wherein in the cutting step, at least a part of the upper core structure is cut such that the height dimension of the cutting piece cut from the lowest part of the upper core structure is the smallest among the plurality of cutting pieces.

This invention provides a method for dismantling a lower reactor core structure that can improve the efficiency of dismantling the lower reactor core structure. [Solution] In the method for dismantling a lower core structure of the present disclosure, the lower core structure comprises a core vessel having a cylindrical shape extending vertically and having a tube support at its upper part that penetrates both the inside and outside; a heat shield covering the portion of the core vessel below the tube support from the outer periphery; and baffle plates and former plates provided on the inside of the core vessel at vertical positions where the heat shield is provided. The method for dismantling a lower core structure includes a division step of horizontally cutting the core vessel in a range below the tube support and above the heat shield.