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The Babcock & Wilcox Owners Group (B&WOG) has performed dimensional inspections on the critical wear-related internal components inside the control rod drive mechanism (CRDM) as a part of a life extension program (LIFEX) over the past 20 years. Under this program, CRDMs at Babcock & Wilcox designed pressurized water reactors (PWRs) were disassembled and inspected. The roller nut outer...