Light Water Reactor Sustainability Program Advanced Seismic Soil Structure Modeling

Bolisetti, Chandrakanth; Coleman, Justin Leigh

doi:10.2172/1235205

Title: Light Water Reactor Sustainability Program Advanced Seismic Soil Structure Modeling

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Abstract

Risk calculations should focus on providing best estimate results, and associated insights, for evaluation and decision-making. Specifically, seismic probabilistic risk assessments (SPRAs) are intended to provide best estimates of the various combinations of structural and equipment failures that can lead to a seismic induced core damage event. However, in some instances the current SPRA approach has large uncertainties, and potentially masks other important events (for instance, it was not the seismic motions that caused the Fukushima core melt events, but the tsunami ingress into the facility). SPRA’s are performed by convolving the seismic hazard (this is the estimate of all likely damaging earthquakes at the site of interest) with the seismic fragility (the conditional probability of failure of a structure, system, or component given the occurrence of earthquake ground motion). In this calculation, there are three main pieces to seismic risk quantification, 1) seismic hazard and nuclear power plants (NPPs) response to the hazard, 2) fragility or capacity of structures, systems and components (SSC), and 3) systems analysis. Two areas where NLSSI effects may be important in SPRA calculations are, 1) when calculating in-structure response at the area of interest, and 2) calculation of seismic fragilities (current fragility calculations assumemore »« less

Authors:

Bolisetti, Chandrakanth ^[1]; Coleman, Justin Leigh ^[1]

Idaho National Lab. (INL), Idaho Falls, ID (United States)

Publication Date:: Mon Jun 01 00:00:00 EDT 2015

Research Org.:: Idaho National Lab. (INL), Idaho Falls, ID (United States)

Sponsoring Org.:: USDOE Office of Nuclear Energy (NE)

OSTI Identifier:: 1235205

Report Number(s):: INL/EXT-15-35687
M3LW-15IN0702035; TRN: US1600234

DOE Contract Number:: AC07-05ID14517

Resource Type:: Technical Report

Country of Publication:: United States

Language:: English

Subject:: 54 ENVIRONMENTAL SCIENCES; 58 GEOSCIENCES; NUCLEAR POWER PLANTS; WATER MODERATED REACTORS; SOILS; WATER COOLED REACTORS; HAZARDS; CRACKS; EARTHQUAKES; FAILURES; FOUNDATIONS; GROUND MOTION; NONLINEAR PROBLEMS; PROBABILISTIC ESTIMATION; SEISMIC WAVES; DILATANCY; LIQUEFACTION; PROBABILITY; SIMULATION; SUSTAINABILITY; RISK ASSESSMENT; SEISMIC ISOLATION; SYSTEMS ANALYSIS; WAVE PROPAGATION; DAMAGE; EQUIPMENT; BUILDINGS; IMPLEMENTATION; MATHEMATICAL MODELS; SOIL-STRUCTURE INTERACTIONS; SEISMIC SURFACE WAVES; seismic; soil structure

Citation Formats


                    Bolisetti, Chandrakanth, and Coleman, Justin Leigh. Light Water Reactor Sustainability Program Advanced Seismic Soil Structure Modeling.  United States: N. p., 2015. 
        Web.  doi:10.2172/1235205.

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                    Bolisetti, Chandrakanth, & Coleman, Justin Leigh. Light Water Reactor Sustainability Program Advanced Seismic Soil Structure Modeling.  United States.  https://doi.org/10.2172/1235205

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                    Bolisetti, Chandrakanth, and Coleman, Justin Leigh. 2015.  
        "Light Water Reactor Sustainability Program Advanced Seismic Soil Structure Modeling".  United States.  https://doi.org/10.2172/1235205.  https://www.osti.gov/servlets/purl/1235205.

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@article{osti_1235205,

  title        = {Light Water Reactor Sustainability Program Advanced Seismic Soil Structure Modeling},

  author       = {Bolisetti, Chandrakanth and Coleman, Justin Leigh},

  abstractNote = {Risk calculations should focus on providing best estimate results, and associated insights, for evaluation and decision-making. Specifically, seismic probabilistic risk assessments (SPRAs) are intended to provide best estimates of the various combinations of structural and equipment failures that can lead to a seismic induced core damage event. However, in some instances the current SPRA approach has large uncertainties, and potentially masks other important events (for instance, it was not the seismic motions that caused the Fukushima core melt events, but the tsunami ingress into the facility). SPRA’s are performed by convolving the seismic hazard (this is the estimate of all likely damaging earthquakes at the site of interest) with the seismic fragility (the conditional probability of failure of a structure, system, or component given the occurrence of earthquake ground motion). In this calculation, there are three main pieces to seismic risk quantification, 1) seismic hazard and nuclear power plants (NPPs) response to the hazard, 2) fragility or capacity of structures, systems and components (SSC), and 3) systems analysis. Two areas where NLSSI effects may be important in SPRA calculations are, 1) when calculating in-structure response at the area of interest, and 2) calculation of seismic fragilities (current fragility calculations assume a lognormal distribution for probability of failure of components). Some important effects when using NLSSI in the SPRA calculation process include, 1) gapping and sliding, 2) inclined seismic waves coupled with gapping and sliding of foundations atop soil, 3) inclined seismic waves coupled with gapping and sliding of deeply embedded structures, 4) soil dilatancy, 5) soil liquefaction, 6) surface waves, 7) buoyancy, 8) concrete cracking and 9) seismic isolation The focus of the research task presented here-in is on implementation of NLSSI into the SPRA calculation process when calculating in-structure response at the area of interest. The specific nonlinear soil behavior included in the NLSSI calculation presented in this report is gapping and sliding. Other NLSSI effects are not included in the calculation. The results presented in this report document initial model runs in the linear and nonlinear analysis process. Final comparisons between traditional and advanced SPRA will be presented in the September 30th deliverable.},

  doi          = {10.2172/1235205},

  url          = {https://www.osti.gov/biblio/1235205},
  journal      = {},
number       = ,

  volume       = ,

  place        = {United States},

  year         = {Mon Jun 01 00:00:00 EDT 2015},

  month        = {Mon Jun 01 00:00:00 EDT 2015}

}

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