Seismic impact

Calculation of critical intensity of seismic impacts Assessment critical range of the geodynamic shift Assessment of maximum stresses in the workings contour zones ... 

Estimation of periodicity of seismic impacts of critical intensity (SICR) Evaluation of loc geodynamic shift al velocities of Calculation of critical value attenuation ... 

One of the main purposes was to prove applicability of LBB conception. Destructive testing of metal samples was done. Also stress and fatigue analyses were performed, considering the actual data for seismic impact in the KNPP site. These analyses show the expediency of additional seismic reinforcement of equipment and piping, and reinforcement was executed later on. 

After the earthquake in Vrancha in 1987, reassessment of the seismic impact was done, and number of measures for improvement the seismic stability of civil constructions and equipment was performed. After the year 1989, IAEA Project (BUL/9/012) was initiated. Within this project additional investigations of the seismic impact on the site were executed, considering also the effect of the local earthquakes. New seismic characteristics of the site were defined SL — 1 = 0.1 g (10 y ) and SL — 2 = 0.2 g (lO " y ). Using the new characteristics, new response spectra were developed (defined) and behaviour of all the components, important to safety, was analyzed under this impact. 

Seismic Impact Zones. Areas of high earthquake activity will be avoided. No portion of a landfill shall be in a seismic impact zone, as defined in 40 CFR 258, unless it is designed to resist the corresponding pressure. 

Natural Futures Wetlands Flood plains Surface waters Groundwater resources Fault zones Seismic impact zones Unstable areas Expansive soils Subsidence zones... 

For the MBRU-12, safety under seismic impacts is to be ensured by following standard procedures prescribed by the regulatory documents. 

Along 20 floors of a building 20 dampers have been installed. The optimisation goal is to minimize the seismic impact and the summed mass of the dampers. 

The FBNR fuel appears to be more robust than that of a PWR. FBNR core appears as a suspended set of loosely packed spheres, whereas PWR fuel assemblies are complex and delicate structures involving grids and thimble rods. In particular, no seismic impact on FBNR fuel is predicted. 

Plate 7.3 Seismic impact force-time history... 

Analysis carried out to assess the actual seismic stability of the plant buildings, structures and systems showed that under seismic impact of magnitude 6 destruction of parts... 

It is assumed that safety under seismic impacts will be assured in conformity with practices set forth in the regulatory documents. The strength analysis of the basic project of the VK-300 confirmed the seismic resistance of the plant up to an earthquake magnitude of 7 on the MSK... 

It is assumed to provide safety from seismic impacts according to the usual procedures prescribed by regulatory documents. 

The high density and corresponding high mass of lead as a coolant result in the need for careful consideration of structural design to prevent seismic impacts to the reactor system. Innovative primary systems configurations with short reactor vessels and the introduction of seismic isolation are options to address such issues. 

A solution of another concept to the problem is to reduce the seismic impact in the heritage structure by using a base isolation system (BIS) with supplementary viscous dampers at the base and the top of the building (Saito 2006). A successful example is the case of Los Angeles City Hall in which the BIS allows to remain stationary while the ground moves up to 500 mm in horizontal direction (Nabih 1996). 

Exploration activities are potentially damaging to the environment. The cutting down of trees in preparation for an onshore seismic survey may result in severe soil erosion in years to come. Offshore, fragile ecological systems such as reefs can be permanently damaged by spills of crude or mud chemicals. Responsible companies will therefore carry out an Environmental Impact Assessment (EIA) prior to activity planning and draw up contingency plans should an accident occur. In Section 4.0 a more detailed description of health, safety and environmental considerations will be provided. 

The common civil engineering seismic testing techniques work on the principles of ultrasonic through transmission (UPV), transient stress wave propagation and reflection (Impact Echo), Ultrasonic Pulse Echo (UPE) and Spectral Analysis of Surface Waves (SASW). 

Seismic zone basis must be specified for structural design. Soil data is important, especially for cases where extensive use of foundation piling is required with major cost impact. Availability of aggregate or natural pond stabilization materials near the site will not be considered for early cost estimates, but can be kept in mind for future planning if the project is given the green light. 

Nudets. A US nuclear detonation warning system. A matrix of seismic sensors spread thruout the USA intended to estimate the point of impact and power of nuclear-detonated nuclear warheads Ref E. Luttwak, A Dictionary of Modem War , Harper Row, NY (1971), 147-R... 

Hexanitrostilbene or HNS (C14H6N6012) is a heat-resistant yellow crystalline solid explosive. HNS is also resistant to radiation, insensitive to electric sparks, and less sensitive to impact than tetryl. It is used in heat-resistant booster explosives and has been used in stage separations in space rockets and for seismic experiments on the moon. Its melting temperature is 316 °C.12... 

Seismic explosives produce the pressure impact during seismic measurements, which are carried out in prospecting for geological deposits, particularly oil horizons. Such explosives must detonate even under high hydrostatic pressures. 

In catalog of Vulcania SPA, Brescia, are listed three seismic expls 1) Vulcania DBf based on TNT nitric salts Trauzl value 320cc, Deton Vel 2600m/sec at d 1.1 and Impact Test with 2kg Wt >90cm 2) Vulcania DBS, based on... 

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