Nuclear Seismic Qualification: class_1e_active_electrical
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 |
|---|---|---|---|---|---|---|---|---|---|
| class_1e_active_electrical | aging_obe_cycles | Number of OBE cycles applied in seismic qualification test sequence before SSE application. | IEEE 344-2013 requires at least 5 OBE events. Aging profile includes thermal + radiation + seismic cycles to simulate end-of-qualified-life. | cycles | 10 | 1 | 5 | test | Class_1E_Seismic_Category_I |
| class_1e_active_electrical | damping_obe_pct | Structural damping ratio for OBE analysis of Class 1E equipment. | Per NRC RG 1.61 Rev.1: welded steel 2%, bolted steel 4%, reinforced concrete 4–7%. Equipment-level damping 2% conservative. | percent_critical | 5 | 2 | 3 | analysis | Class_1E_Seismic_Category_I |
| class_1e_active_electrical | damping_sse_pct | Structural damping ratio for SSE analysis. Higher than OBE; nonlinear response permitted. | SSE damping values per NRC RG 1.61: welded steel 4%, bolted steel/RC 7%. | percent_critical | 7 | 3 | 5 | analysis | Class_1E_Seismic_Category_I |
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