Nuclear Seismic Qualification: electrical_switchgear
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 |
|---|---|---|---|---|---|---|---|---|---|
| electrical_switchgear | fragility_beta_randomness | Randomness variability (beta_R) for switchgear fragility. Reflects variability in floor spectra and equipment response. | Based on EPRI/NRC generic fragility studies of switchgear; relay chatter failure mode. | dimensionless | 0.4 | 0.2 | 0.28 | fragility_analysis | Class_1E_Seismic_Category_I |
| electrical_switchgear | fragility_beta_uncertainty | Epistemic uncertainty (beta_U) for switchgear fragility. Reflects modeling and data uncertainty. | Higher for complex equipment with multiple failure modes. Composite beta_C = SRSS(beta_R, beta_U). | dimensionless | 0.45 | 0.25 | 0.35 | fragility_analysis | Class_1E_Seismic_Category_I |
| electrical_switchgear | fragility_median_capacity_Am_g | Median seismic capacity for nuclear-qualified electrical switchgear (metal-clad, 4.16kV/480V). | Varies widely by configuration; cabinet rocking/sliding governs low values; relay chattering/contact bounce at intermediate. Well-anchored switchgear Am ~1.0–2.0g. | g | 3 | 0.5 | 1.2 | fragility_analysis | Class_1E_Seismic_Category_I |
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anchorage_design2 rowsclass_1e_active_electrical3 rowsclass_1e_passive_structural3 rowsdiesel_generator2 rowsinstrumentation_control_panel2 rowsmotor_control_center3 rowsnon_seismic1 rowpiping_large1 rowpiping_small1 rowpump_active2 rowsqualification_by_analysis2 rowsqualification_by_experience1 row