The inspectors identified a Green
NCV of
10 CFR 50, Appendix B, Criterion III, Design Control, for failure to translate critical design attributes into drawings and the as-built condition of the plant. As a result, the fuel and air supplies to the
emergency diesel generators (
EDGs) were susceptible to risk from impingement due to potential structural failures of a wall for two external events, tornado and seismic. This finding is more than minor because it impacts the
mitigating systems cornerstone objective of ensuring the availability, reliability, and capability of systems needed to mitigate the consequences of an accident. The inspectors assessed the finding using the
SDP and determined that the finding was of very low safety significance (Green) because the deficiency, although sufficient to exceed the critical deflection limits and result in cracking, was analyzed to not result in catastrophic collapse. This issue is documented in the corrective action program as
NCRs 276674, 277720, and 279326. (Section 1R21.2.9
