What is a design basis earthquake?
The basic goal of earthquake resistant building design codes is to provide life safety in the event of extreme earthquake loading and to reduce the seismic risk in the long run. 2800), design basis earthquake is defined as an earthquake with 10% probability of exceedance (PE) in 50 years.
What is the design basis?
Definition. Information that identifies the specific functions to be performed by a structure, system, or component of a facility, and the specific values or range of values chosen for controlling parameters as reference bounds of design.
What is OBE and SSE?
OBE is a ground motion with 10% probability of exceedance within 50 year period (475 years return period). SSE is a Maximum Considered Earthquake (MCE) ground motion with 2% probability of exceedance within 50 year period.
What is beyond design basis accident?
In RD-337 version 1, DECs were referred to as “credible beyond-design-basis accidents (BDBAs)”. Conditions and events that are practically eliminated are those with such a low probability of occurring that they are not considered to be DECs.
How does the intensity of earthquake vary as we move away from the epicenter?
Clearly, the severity of shaking is much higher near the epicenter than farther away. Thus, during the same earthquake of a certain magnitude, different locations experience different levels of intensity.
What is a basis of design product?
Basis-of-Design Product: Where Specifications name a product, or refer to a product indicated on Drawings, and include a list of manufacturers, provide the specified or indicated product or a comparable product by one of the other named manufacturers.
What is OBE in seismic?
The OBE is that earthquake which, considering the regional and local geology and seismology and specific characteristics of local subsurface material, could reasonably be expected to affect the plant site during the operating life of the plant.
What is the full form of DBE in earthquake?
The DBE (Design Basic Earthquake) is the earthquake effects which can reasonably be expected to occur at least once during the design life of the structure.
How does the epicenter affect an earthquake?
Magnitude is related to the amount of seismic energy released at the hypocenter of the earthquake. It is based on the amplitude of the earthquake waves recorded on instruments which have a common calibration. The point on the Earth’s surface directly above the focus is called the epicenter of the earthquake.
Where does the design basis earthquake come from?
The design basis earthquake from the Chinese Specification for Seismic Design of Hydraulic Structures is used. The simultaneous actions of the upstream, vertical and cross-stream ground motion components are considered.
What is the operating basis for earthquake ground motion?
The operating basis earthquake ground motion is only associated with plant shutdown and inspection unless specifically selected by the applicant as a design input.
What is the definition of the design basis?
The DB is defined as a set of conditions, needs, and requirements (including legal requirements) taken into account in designing a facility or product. The concept can be applied to a particular SSC or to the whole plant. The DB establishes the essentials of the engineering procedures needed to design the plant.
What does DBE stand for in earthquake category?
design-basis earthquake (DBE): “That earthquake for which the safety systems are designed to remain functional both during and after the event, thus assuring the ability to shut down and maintain a safe configuration.”