A rod cluster control assembly having a control rod upper end plug formed in two parts and connected together with a flexible joint coupling located at or below a connecting finger on a spider vane. The method includes maintaining a master copy of a software on a server and capturing changes to the master copy of the software on an update disk image, where the changes are contained in at least one chunk. The controller employs zero voltage in the second leg to reduce the switching loss. The diacid or cyclic anhydride provides a means for attaching the polar polyamine to the dispersant structure through an amide linkage.