Nuclear Seismic Qualification: qualification_by_analysis
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 | qualification method | seismic category |
|---|---|---|---|---|---|
| qualification_by_analysis | combined_modal_srss | Square Root Sum of Squares (SRSS) or Complete Quadratic Combination (CQC) method for combining modal responses. | SRSS acceptable for well-separated modes. CQC required when modes closely spaced (< 10% frequency separation per NRC SRP 3.7.2). | analysis | Class_1E_Seismic_Category_I |
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