Nuclear Seismic Qualification: seismic_category_i_structure
Seismic qualification requirements for nuclear power plant safety-related equipment per IEEE 344-2013, NRC Regulatory Guide 1.100 Rev.4, and NRC RG 1.60/1.61. Covers equipment seismic categories (Class 1E, Category I/II, non-seismic), test levels (OBE/SSE in g), Required Response Spectra (RRS) frequency ranges, damping ratios, fragility parameters (median capacity Am, randomness beta_R, uncertainty beta_U, HCLPF) by equipment class (switchgear, MCC, I&C panels, diesel generators, pumps, valves, piping, tanks), and anchorage design requirements.
| equipment category | qualification parameter | description | notes | parameter unit | parameter value max | parameter value min | parameter value typical | qualification method | seismic category |
|---|---|---|---|---|---|---|---|---|---|
| seismic_category_i_structure | fragility_beta_randomness | Logarithmic standard deviation for randomness (aleatory) in seismic fragility (beta_R). | Represents inherent variability in structural response and capacity that cannot be reduced with more data. Typically 0.25–0.35 for well-characterized SSCs. | dimensionless | 0.45 | 0.2 | 0.3 | fragility_analysis | Seismic_Category_I_Structure |
| seismic_category_i_structure | fragility_beta_uncertainty | Logarithmic standard deviation for modeling uncertainty (epistemic) in seismic fragility (beta_U). | Represents uncertainty reducible with more knowledge. Typical values 0.30–0.40 for equipment, 0.25–0.35 for structures. | dimensionless | 0.5 | 0.25 | 0.35 | fragility_analysis | Seismic_Category_I_Structure |
| seismic_category_i_structure | fragility_median_capacity_Am_g | Median seismic capacity (Am) for Seismic Category I structures. Used in seismic PRA. | Am represents median ground acceleration causing failure including all uncertainty. Range spans simple anchorage (~0.3g) to robust concrete structures (>2g). Fragility log-normal model. | g | 3 | 0.3 | 0.8 | fragility_analysis | Seismic_Category_I_Structure |
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