[满足加严的图纸尺寸要求（在图纸尺寸基础上，加严K*S）] Hi! I'm translating a short manual with the characteristics of a device which scans pellet rods in nuclear power plants. (this is the title of the document: 高速无源γ扫描检测设备技术条件) I don't understand 加严 here. I looked up several dictionaries but they all say something ling "tighten" and that does not make too much sense. The previous sentence was: 设备能够测量空腔长度（90x90的置信度水平下） Thaaaaaank you very much in advance.