IEEE 344-2013 pdf free.IEEE Standard for Seismic Qualification of Equipment for Nuclear Power Generating Stations.
IEEE 344 provides methods and documentation requirements for seismic qualification of equipment to verify the equipment’s ability to perform its specified performance requirements during and/or after the specifed seismic motions.
The following referenced documents are indispensable for the appication of this document (ie, they must be understood and used, so each referenced document is cited in text and its relationship to this document is explained). For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments or corrigenda) applies.
For the purposes of this document, the following terms and definitions apply. The IEE Standards
Dictionary Online should be consulted for terms not defined in this clause.
broadband response spectrum: A response spectrum that describes motion in which amplified response occurs over a wide (broad) range of frequencies.
coherence function: A comparative relationship between two time histories. It provides a statistical.estimate of how much two motions are related, as a function of frequency. The numerical range is from zero for unrelated to +1.0 for related motions.
correlation coefficient function: A comparative relationship between two time histories. It provides a statistical estimate of how much two motions are related, as a function of time delay. The numerical range is from -1.0 for inversely related motions, zero for unrelated, to +1.0 for related motions.critical seismic characteristics: Those design, material, and performance characteristics of an equipment item that provide reasonable assurance that the item will perform its required function under seismic loads.
cutoff frequency: The frequency in the response spectrum where the zero period acceleration (ZPA) asymptote begins. This is the frequency beyond which the single-degree-of- freedom (SDOF) oscillators exhibit no amplification of motion and indicate the upper limit of the frequency content of the waveform being analyzed.
damping: An energy dissipation mechanism that reduces the amplification and broadens the vibratory response in the region of resonance. It is usually expressed as a percentage of critical damping. Critical damping is defined as the least amount of viscous damping that causes a single-degree of-freedom (SDOF) system to return to its original position without oscillation after initial disturbance.
earthquake experience spectrum (EES): The response spectrum that defines the scismic capacity of a reference equipment class based on earthquake experience data.
flexible equipment: Equipment, structures, and components whose lowest resonant frequency is less than the cutoff frequency on the response spectrum.
floor acceleration: The acceleration of a particular building floor (or equipment mounting) resulting from the motion of a given earthquake. The maximum floor acceleration is the zero period acceleration (ZPA) of the floor response spectrum.
Fourier spectrum: A complex valued function that provides amplitude and phase information as a function of frequency for a time domain waveform.
fragility response spectrum: A response spectrum that defines the ultimate seismic capability of the equipment under test based upon fragility data.
ground acceleration: The acceleration of the ground resulting from the motion of a given earthquake. The maximum ground acceleration is the zero period acceleration (ZPA) of the ground response spectrum.
inclusion rules: The rules that define the bounds of equipment included in a reference equipment class based on an acceptable range of equipment physical characteristics, dynamic characteristics, and functions for which scismic ruggedness has been demonstrated by experience data.
NOTE- See 10.23.1 and 10.3.3.1.5
independent items: Components and equipment that (a) have different physical characteristics or (b) experienced different seismic motion characteristics, e.g.. different earthquakes, different sites, different buildings, or different orientations/locations in the same building.
median-centered in-structure response spectrum: In-structure response spectrum developed using realistic damping and best estimate modeling parameters to obtain the most probable structural amplification that could realistically occur for the level of the specified earthquake ground motion.narrowband response spectrum: A response spectrum that describes the motion in which amplified response occurs over a limited (narrow) range of frequencies.IEEE 344 pdf free download.