Two main types of uncertainties exist in LIP more » flood modeling: (1) aleatory uncertainties that arise from the inherent natural variability of the hydrometeorological system and (2) epistemic uncertainties that arise from the analysts’ incomplete knowledge of the hydrometeorological and site configuration. This report describes the work done under Task 2 of the study that focused on describing uncertainties associated with LIP flood modeling. NRC’s interest is in developing guidance for performing LIP PFHA at nuclear power plant (NPP) sites.
Nuclear Regulatory Commission (NRC) funded Local Intense Precipitation (LIP) Probabilistic Flood Hazard Assessment (PFHA) Pilot Study, the Pacific Northwest National Laboratory (PNNL) reviewed hydrologic and hydraulic modeling approaches for estimation of LIP flooding and their implementation in readily available simulation software packages (Prasad and Yuan 2020).
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