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10 CFR 50 Appendix B, Criterion III, requires in part, That measures shall be established to assure that the design bases are correctly translated into specifications, drawings procedures, and instructions. Contrary to the above, from original plant construction until June 22, 2016, GGNS failed to ensure the design basis tornado and differential pressures associated with it, would not cause a spurious trip of the Division I and II standby diesel generators. Specifically, a design basis tornado, includes a differential pressure of 3.0 psig, whereas an active diesel generator trip on high crankcase pressure actuates at 1.5 psig. The licensee identified this issue using an effective operating experience program and entered it in the corrective action program as Condition Report CR -GGN -2016- 04919. The violation is of very low safety significance (Green), for the same reason as NCV -05000416/2017007 -05, discussed in Section 1R21.4.5 of this report.
|Report||IR 05000416/2017007 Section 4OA7|
|Date counted||Dec 31, 2017 (2017Q4)|
|Inspectors (proximate)||W Sifre|
|Violation of:||10 CFR 50 Appendix B Criterion III, Design Control|
Finding List (Grand Gulf) @ 2017Q4
Self-Identified List (Grand Gulf)