The NRC research program on seismic component fragilities
Since 1985, the US Nuclear Regulatory Commission (NRC) has been conducting tests, collecting data, and performing studies related to the capacity and failure modes of safety-related electric components at nuclear power units. A simple yet reliable single-parameter descriptor was the desired means of defining seismic fragility for use in probabilistic risk assessments (PRAs). Livermore Laboratory concluded, based on its testing and evaluation of relays mounted in motor control centers, that the spectral acceleration was an appropriate parameter. The BNL used an average of the spectral acceleration (SA) within a frequency band of 4 to 16 Hz and developed and implemented a methodology for computing high confidence of low probability of failure (HCLPF) values for ASA and also zero period accelerations (ZPA). At the conclusion of the BNL Seismic Component Fragilities Program in early 1991, fragilities will be available for motor control centers, switchgear (low and medium voltage), panel boards, switchboards, power supplies, nuclear steam supply system, and balance-of-plant instrumentation and control panels, transmitters, indicators, switches, transformers, batteries, battery chargers, inverters, motors, and electric penetration assemblies. Using the ASA and ZPA is in contrast to the EPRI approach using a generic equipment ruggedness spectrum (GERS). While the initial objectives dealt with PRAs, the licensing staff recognized that the information being amassed is also responsible to the needs of unresolved safety issue (USI) A-46.
- OSTI ID:
- 6843414
- Report Number(s):
- CONF-901101-; CODEN: TANSAO
- Journal Information:
- Transactions of the American Nuclear Society; (United States), Vol. 62; Conference: American Nuclear Society (ANS) winter meeting, Washington, DC (United States), 11-16 Nov 1990; ISSN 0003-018X
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
NUCLEAR POWER PLANTS
REACTOR COMPONENTS
RISK ASSESSMENT
SEISMIC EFFECTS
BATTERY CHARGERS
BNL
DATA BASE MANAGEMENT
ELECTRIC BATTERIES
ELECTRICAL EQUIPMENT
EPRI
LAWRENCE LIVERMORE LABORATORY
MOTORS
POWER SUPPLIES
PROBABILISTIC ESTIMATION
REACTOR CONTROL SYSTEMS
REACTOR INSTRUMENTATION
RESEARCH PROGRAMS
SENSITIVITY
STEAM SYSTEMS
SWITCHES
TRANSFORMERS
US NRC
CONTROL SYSTEMS
ELECTROCHEMICAL CELLS
ELECTRONIC EQUIPMENT
ENGINES
EQUIPMENT
MANAGEMENT
NATIONAL ORGANIZATIONS
NUCLEAR FACILITIES
POWER PLANTS
THERMAL POWER PLANTS
US AEC
US DOE
US ERDA
US ORGANIZATIONS
220900* - Nuclear Reactor Technology- Reactor Safety
220200 - Nuclear Reactor Technology- Components & Accessories