Contributors

Author

• M.R Aram

Abstract

The study of micro seismicity and monitoring the micro seismic for the purpose of surveying the existing faults treatments and recognition of blind faults and other active tectonic structures in various phases of constructing the important structures, specially nuclear power plants, is unavoidable. According to IAEA safety guides and US-NRC regulatory guides, suitable instrumentation must be provided so that the seismic response of nuclear power plant features importantly from the safety point of view. According to R.G. 1.165 seismic monitoring by a network of seismic stations in the site area should be established as soon as possible after the site selection. Also, it is necessary to shutdown the nuclear power plant if vibratory ground motion exceeds the operating basis earthquake (OBE). The current research demonstrates the field works and studies for locating the local seismograph network in Darkhovein nuclear power plant. After the official studies and the primary visit of the old seismograph stations it was found that the mentioned network doesn’t cover completely the geological structures around the power plant. Therefore, new locations have been introduced through the field investigation and computational methods of optimization. In positioning the new stations, places with the least amount of noise and the best coverage for seismic sources were selected. The modeling with considering an imaginative station at the selected places shows that the thresholds of the complete records of earthquakes around Darkhovein site is under the magnitude 1 (about 0.8).
 

Highlights

 

1. “A performance based approach to define the site specific earthquake ground motion,” US NRC Regulatory Guide, 1.208 (March 2007).

    

2. “Identification and Characterization of Seismic Sources and Determination of Safe Shutdown Earthquake Ground Motion,” US NRC Regulatory Guide, 1.165.

 

1. Geologic and Seismic Criteria, US NRC, 10 CFR Parts 50, Appendix S, Earthquake Engineering Criteria for Nuclear Power Plants.

    

2. “Nuclear Power Plant Instrumentation for Earthquakes,” US NRC, RG. 1.12.

 

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Keywords

• Seismic Network
• Noise
• Nuclear Power Plant
• Fault
• Tectonic