September 13, 2019

Reinforced Concrete Shear Wall Capacity Advances

By: Gregory Hardy, Timothy Graf, Riccardo Cappa, John Richards

Seismic PRAs have become more common in the nuclear power industry following the Fukushima accident caused by the 2011 earthquake and tsunami. In order to provide best estimates of the risk, the seismic fragilities should be as realistic as...

Markets:Nuclear
Keywords:Concrete-Reinforced, Seismic Probabilistic Risk Assessment (PRA)
September 13, 2019

Case Study: Cable Tray Seismic Fragility Evaluation Involving Ductile Failure of a Cold-Formed Steel Section in Flexure

By: Michael Perkins, Frederic Grant

This paper presents a case study for a recent seismic fragility evaluation of cable trays at a nuclear power plant in the United States. The evaluation was initiated due to the presence of non-serrated strut nuts in cable tray supports throughout...

Markets:Nuclear
Keywords:Seismic Analyses
September 13, 2019

Nonlinear Response of a Structure with Significant Soil-Structure Interaction Effects for Application to Seismic Fragility Evaluation

By: Philip Hashimoto, Juan Jimenez-Chong, David Nakaki, Robert P. Kennedy

An important element of structure seismic fragility evaluation for seismic probabilistic risk assessment is determination of the inelastic energy absorption factor. This factor accounts for a structure’s ability to withstand earthquake...

Markets:Nuclear
Keywords:Nonlinear, Seismic Probabilistic Risk Assessment (PRA), Soil-Structure Interaction
September 13, 2019

Seismic Soil-Structure Interaction Analysis of an Embedded Structure with Partially Bonded Side-Soil

By: Cameron Samuelson-Sanford, Juan Jimenez-Chong, Mohamed Talaat, Philip Hashimoto, David Nakaki, Oleg Maslenikov, James J. Johnson

Seismic soil-structure interaction (SSI) analysis is performed for an embedded structure with partially bonded side-soil in support of the seismic probabilistic risk assessment of a nuclear power plant. Adjacent buildings with shallower embedment...

Markets:Nuclear
Keywords:Seismic Probabilistic Risk Assessment (PRA)
September 13, 2019

Effects of Boundary Conditions on PWR SNF Rod Stiffness and Stresses Under Pinching Loads

By: Ricardo Medina, Elmar Eidelpes, Luis F. Ibarra

The effects of rod boundary conditions (BCs) on the stiffness and cladding stresses of pressurized water reactor (PWR) spent nuclear fuel (SNF) rods under pinching loading are investigated. Pinching may occur at the assembly spacer grids during...

Markets:Nuclear
September 13, 2019

Seismic Fragility af Anchored Flat-Bottom Storage Tanks on Ring Foundations

By: Abhinav Anup, Philip Hashimoto, Robert P. Kennedy

Seismic fragility evaluations of anchored flat-bottom storage tanks typically follow the approaches outlined in EPRI (1991) and EPRI (1994a), which are intended for tanks founded on rigid mat foundations. Direct application of these approaches is...

Markets:Nuclear
Keywords:Seismic Probabilistic Risk Assessment (PRA)
September 13, 2019

A Hybrid SSI Analysis Method for Embedded and Partially Bonded Rigid Foundations

By: David Nakaki, Mohamed Talaat, Juan Jimenez-Chong, Cameron Samuelson-Sanford, James J. Johnson, Oleg R. Maslenikov

CLASSI and SASSI are two sub-structuring approaches to analyze the phenomena of soil-structure interaction (SSI) with extensive applications in the nuclear power industry. Many similarities exist in the two methods; both approaches treat the SSI...

Markets:Nuclear
September 13, 2019

Seismic Fragility Evaluation of Metal Flat-Bottom Storage Tanks with Short Anchor Bolt Chairs

By: Abhinav Anup, Ho Jung Lee, Philip Hashimoto, Robert P. Kennedy

Seismic fragilities of anchored metal flat-bottom storage tanks are usually governed by tank overturning. Tank overturning capacity is typically influenced more by the hold-down strength of the anchors rather than the buckling strength of the...

Markets:Nuclear
Keywords:Seismic Probabilistic Risk Assessment (PRA)
September 13, 2019

Equipment Capacities from Earthquake Experience Data for Use in Fragility Calculations

By: Riccardo Cappa, Frederic Grant, Gregory Hardy, John Richards

Electric Power Research Institute (EPRI) has recently researched the development of refined equipment capacities from earthquake experience data for use in fragility calculations, which is a key component of nuclear seismic probabilistic risk...

Markets:Nuclear
Keywords:Seismic Probabilistic Risk Assessment (PRA)
September 13, 2019

Risk-Consistent Vertical Ground Motion Spectra for Seismic Probabilistic Risk Assessment

By: Mohamed Talaat, Siavash Dorvash

Seismic Probabilistic Risk Assessment (SPRA) of nuclear power plants (NPPs) is typically performed using three major analysis components: probabilistic seismic hazard, seismic fragility, and plant response analyses. The seismic hazard output is...

Markets:Nuclear
Keywords:Seismic Probabilistic Risk Assessment (PRA)

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