NRC CAL – NOV (White)

On November 12, 2009, the NRC issued a Notice of Violation to NextEra Energy Seabrook, LLC, for a violation of 10 CFR 50, Appendix B, Criterion III, "Design Control," at Seabrook Station. The violation, which is associated with a White Significance Determination Process finding, involved the failure to assure that the design basis of the B emergency diesel generator (EDG) was correctly translated into work instructions and that measures were established for the selection of suitable parts and materials. Specifically, a design change to a flange on a jacket water cooling line to the B EDG turbocharger did not (1) control welding stresses, verify flange alignment, or evaluate vibration effects, (2) address suitability of gasket material, or (3) consider flange performance history. This resulted in failure of the flange during operation of the B EDG, leading to rapid loss of jacket cooling water and inoperability of the EDG.