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)
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....

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

A Probabilistic Assessment of PWR SNF Rod Pinching Failure Considering Hydride-Related Cladding Embrittlement

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

A probabilistic assessment of the likelihood of PWR SNF rod failure considering hydride-related cladding embrittlement after dry storage cool-down of 300 years is presented. The investigated rod failure mechanism is cladding cracking caused by...

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

Numerical Simulation of a Transportation Cask and Transmissibility due to 0.3 M Drop

By: Ricardo Medina, Shokoufeh Zargar, Luis F. Ibarra

In the absence of experimental and measured data, a reliable numerical model is needed to predict the performance of fuel assemblies after extended storage, including acceleration and strain of fuel rods due to impact and vibration, and quantify...

Markets:Nuclear
Keywords:Risk Assessment
September 13, 2019

Partial Correlation and Dependence Between Seismic Fragilities of Multiple Adjacent Structures with Significant Soil-Structure-Interaction Effects

By: Mohamed Talaat, Robert P. Kennedy

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. The fragility analysis develops...

Markets:Nuclear
Keywords: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

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)
August 6, 2019

Performance of CFRP-Lined PCCP with Continuing Wire Breakage

By: Murat Engindeniz, Rasko Ojdrovic, Michael P. Gipsov

Washington Suburban Sanitary Commission (WSSC) has been using carbon fiber reinforced polymer (CFRP) liners for repair of prestressed concrete cylinder pipe (PCCP) since mid-2000s. As part of its repair program, WSSC also performs investigations...

Services:Structural Investigation
Markets:Water/Wastewater
Keywords:Composites-FRP / CFRP / GFRP, PCCP
August 6, 2019

Rehabilitation of a Critical High-Pressure Transmission Main underneath and in the Vicinity of a Major Highway

By: Murat Engindeniz, Kristen Peterson, Roman Obzejta, Sarah Mathis

The joint transmission main (JTM) is part of the 38 mile long Joint Regional Water Supply System, operated and maintained by the South Coast Water District in California. The pipeline, made of 60 in. diameter PCCP manufactured in early 1960s,...

Services:Structural Rehabilitation
Markets:Water/Wastewater
Keywords:Composites-FRP / CFRP / GFRP, Inspection, PCCP

Pages