Abstract: Provided is a method for maintaining cutting quality in which a work surface can be reliably maintained at a predetermined hardness or less regardless of a disturbance during cutting. The method includes a data-acquiring step of acquiring, as a target cutting resistance, the cutting resistance of a machining tool (7) during cutting performed such that the hardness of a surface layer is lower than a predetermined hardness by adjusting machining conditions; and a cutting step of performing cutting while detecting the cutting resistance of the machining tool (7) during cutting and performing control such that the detected cutting resistance is lower than the target cutting resistance.

Abstract: It is provided that a machining conditions setting system and a machining conditions setting method with which it is possible to select a machining condition for machining according to a target degree of hardness and obtain a predetermined degree of hardness by performing only the machining. The machining conditions setting system includes: a machining conditions database that, by determining in advance a relationship between the machining condition and a degree of hardness of the workpiece machined under the machining condition, stores the machining condition corresponding to the material of the workpiece and a range of degree of hardness for machining; and machining conditions selection means into which a material of a workpiece and a target degree of hardness are input, and which outputs a machining condition under which machining with the target degree of hardness can be performed, referring to the machining conditions database.

Abstract: A machining method for austenite stainless steel equipment and piping, and nuclear power plant equipment and piping machined by use of this method are provided to suppress occurrence of a hardened layer due to machining, and capable of suppressing occurrence of SCC without performing an after treatment and reducing working hours and cost. The machining method for austenite stainless steel equipment and piping according to the first aspect of the present invention includes a finishing treatment process for performing a machining operation by use of a throw-away tip (5) whose rake angle is +29° or more to suppress work hardening of a surface.

Abstract: A nuclear-power-plant soundness evaluation system includes a stress-distribution calculating unit that outputs a stress distribution and an identified crack generating part; a crack-growth prediction unit that predicts how the crack will grow from the crack generating part; and a soundness maintenance unit that has a maintenance database in which crack-growth prediction results and maintenance measures are associated and reads out from the maintenance database a maintenance measure corresponding to the crack-growth prediction result and presents the read-out maintenance information to a user.