September 26, 2019

Energy, Hygrothermal, and Freeze-Thaw Considerations for Insulating Mass Masonry Walls

This paper discusses energy modeling and previous research regarding freeze-thaw masonry deterioration to challenge common assumptions about the benefits and risks of insulating masonry walls.

It is...

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...

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...

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...

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...

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...

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...

September 13, 2019

Equipment Capacities from Earthquake Experience Data for Use in Fragility Calculations

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...

September 13, 2019

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

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...

September 13, 2019

Case Study Investigating Probabilistic and Deterministic Sampling Methods for Developing In-Structure Response Spectra: Phase II

By: Riccardo Cappa, Andrew Appelbaum, Frederic Grant

The goal of this ongoing, multi-phase research project is to assess the accuracy of simplified deterministic sampling methods used in practice to estimate seismic structural response compared to more rigorous probabilistic sampling approaches....