NRC CAL – NOV (White)

On February 25, 2010, a Notice of Violation was issued to Exelon Generation Company, LLC, for a violation associated with a White Significance Determination Finding as a result of inspections at the Braidwood Nuclear Power Station. This finding involved a violation of 10 CFR Part 50, Appendix B, Criterion III, "Design Control," which requires, in part, that measures be established for the selection and review for suitability of application of materials, parts, equipment, and processes that are essential to the safety-related functions of the structures, systems, and components. Specifically, on June 24, 2009, a safety-related valve failed to stroke full open during a surveillance testing procedure. Following the test failure, the licensee determined that water entered the valve actuator through conduit penetration and caused corrosion to the valve internals, which caused the valve not to fully open.