The inspectors identified a finding of very-low safety significance (Green) and an associated
NCV of Title 10 of the Code of Federal Regulations, Part 50, Appendix B, Criterion III, Design Control, for licensees failure to assure that quality standards for the Target Rock Relief valve
accumulator were specified and included in the design documents and that deviations were identified and controlled. Specifically, Engineering Change (
EC 394119) fabricated the replacement Unit 2 Target Rock valve
accumulator to American National Standard B31.1 Power Piping code requirements instead of the applicable American Society of Mechanical Engineers Boiler and Pressure Vessel Code,
Section VIII requirements, without adequate justifications. The licensee captured this issue in their Corrective Action Program as
IR 02708406 to evaluate the appropriate corrective actions and revise documentation as required. The performance deficiency was determined to be more-than-minor because it was associated with the Mitigating System cornerstone attribute of design control and adversely affected the cornerstone objective to ensure the availability, and reliability of systems that respond to
initiating events to prevent undesirable consequences. The finding screened as of very-low safety significance (Green) because it did not result in the loss of operability or functionality of any affected structure, system, or components. This finding has a cross-cutting aspect in the area of Human Performance in the area of Design Margin because the licensee failed to maintain equipment within its design margins.
