Seismic fragility of nuclear power plant components: Phase 2, Motor control center, switchboard, panelboard and power supply
In Phase I of the Component Fragility Program, Brookhaven National Laboratory (BNL) has developed a procedure to establish the seismic fragility of nuclear power plant equipment by use of existing test data and demonstrated its application by considering two equipment pieces. In Phase II of the program, BNL has collected additional test data, and has further advanced and is applying the methodology to determine the fragility levels of selected essential equipment categories. The data evaluation of four equipment families, namely, motor control center, switchboard, panelboard and power supply has been completed. Fragility levels have been determined for various failure modes of each equipment class and the deterministic results are presented in terms of test response spectra. In addition, the test data have been analyzed for determination of the respective probabilistic fragility levels. To this end, a single g-value has been selected to approximately represent the test vibration level and a statistical analysis has been performed with the g-values corresponding to a particular failure mode. The zero period acceleration and the average spectral acceleration over a frequency range of interest are separately used as the single g-value. The resulting parameters are presented in terms of a median value, an uncertainty coefficient and a randomness coefficient. Ultimately, each fragility level is expressed in terms of a single descriptor called an HCLPF value corresponding to a high (95%) confidence of a low (5%) probability of failure. The important observations made in the process of data analysis are included in this report.
- Research Organization:
- Brookhaven National Lab. (BNL), Upton, NY (United States)
- DOE Contract Number:
- AC02-76CH00016
- OSTI ID:
- 5654177
- Report Number(s):
- NUREG/CR-4659-Vol.2; BNL-NUREG-52007-Vol.2; ON: TI88005471; TRN: 88-009904
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
CONTROL SYSTEMS
SEISMIC EFFECTS
VULNERABILITY
ELECTRICAL EQUIPMENT
REACTOR COMPONENTS
DATA ANALYSIS
DATA ACQUISITION
FAILURES
MECHANICAL VIBRATIONS
NUCLEAR POWER PLANTS
POWER SUPPLIES
PROBABILITY
REACTOR SAFETY
RECOMMENDATIONS
STATISTICAL MECHANICS
STATISTICS
TESTING
ELECTRONIC EQUIPMENT
EQUIPMENT
MATHEMATICS
MECHANICS
NUCLEAR FACILITIES
POWER PLANTS
SAFETY
THERMAL POWER PLANTS
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