The purpose of this study is to determine the effect of the initial power level during a rod ejection accident (REA) on the ejected rod worth and the resulting energy deposition in the fuel. The model used is for the hot zero power (HZP) conditions at the end of a typical fuel cycle for the Three Mile Island Unit 1 pressurized water reactor. PARCS , a transient, three-dimensional, two-group neu...

We have used transmission electron microscopy (TEM) to observe the morphologies of ferrite nanoparticles synthesized using a radio frequency plasma torch. These nanoparticles were faceted, having cuboctahedral polygonal growth forms with exclusively the {111} and {100} type faces. A model for the critical nucleus shapes and the growth forms of small cuboctahedral particles is proposed consideri...

In the BEPU (Best Estimate Plus Uncertainty) framework, uncertainty quantification (UQ) is a requirement to improve confidence and reliability of code predictions. Over years, lot works have been done quantify uncertainties in predictions spent nuclear fuel (SNF) characteristics due data uncertainties. The purpose this study pressurized water reactor (PWR) assembly radiation source terms (isoto...

RAVEN is a software tool under development at the Idaho National Laboratory (INL) that acts as the control logic driver and post-processing tool for the newly developed Thermo-Hydraylic code RELAP7. The scope of this paper is to show the software structure of RAVEN and its utilization in connection with RELAP-7. A short overview of the mathematical framework behind the code is presented along w...

Understanding the mechanical behaviour of reactor pressure vessel (RPV) steels at high fluences has become an important topic in regard to Long-Term Operations (LTO) existing nuclear power plants (NPP). The effectiveness thermal annealing treatments recover properties compositionally tailored pressurised water (PWR) model irradiated neutron fluences, up 1.22 × 1020 n·cm?2, is analysed this stud...

Abbreviations: A wave late-filling wave; CW continuouswave; dP/dtmax positive maximum first derivative of pressure, corrected for time; Ea arterial elastance; E/A ratio of the early and rapid-filling wave to the late-filling wave; E wave early and rapid-filling wave; LA left atrium atrial; LAP left atrial pressure; LV left ventricle/ventricular; LVEDA left ventricular end-diastolic area; LVEDP ...

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The purpose of this paper is to present an approach to optimization in which every target is considered as a separate objective to be optimized. For an efficient search through the solution space we use a multiobjective genetic algorithm which allows us to identify a set of Pareto optimal solutions providing the decision maker with the complete spectrum of optimal solutions with respect to the ...