Comparison and sensitivity analysis of the core characteristics of a sodium-cooled fast breeder reactor with 750 MWe output evaluated by JENDL-4.0 and ADJ2000R

2014 ◽  
Vol 51 (4) ◽  
pp. 558-567 ◽  
Author(s):  
Kazuya Ohgama ◽  
Shigeo Ohki ◽  
Kazuteru Sugino ◽  
Tsutomu Okubo
2019 ◽  
Vol 2 (5) ◽  
Author(s):  
Mengda Zhang ◽  
Chenjing Zhou ◽  
Tian-tian Zhang ◽  
Yan Han

Selecting check index quantitatively is the core of the calibration of micro traffic simulation parameters at signal intersection. Five indexes in the node (intersection) module of VISSIM were selected as the check index set. Twelve simulation parameters in the core module were selected as the simulation parameters set. Optimal process of parameter calibration was proposed and model of the intersection of Huangcun west street and Xinghua street in Beijing was built in VISSIM to verify it. The sensitivity analysis between each check index and simulation parameter in their own set was conducted respectively. Sensitive parameter sets of different check indices were obtained and compared. The results show that different indexes have different size of set, and average vehicle delay's is maximum, so it's necessary to select index quantitatively. The results can provide references for scientific selection of the check indexes and improve the study efficiency of parameter calibration.


2013 ◽  
Vol 61 (1) ◽  
pp. 201-210 ◽  
Author(s):  
R. Studziński ◽  
Z. Pozorski ◽  
A. Garstecki

Abstract The paper addresses the problems of the sensitivity analysis and optimal design of multi-span sandwich panels with a soft core and flat thin steel facings. The response functional is formulated in a general form allowing wide practical applications. Sensitivity gradients of this functional with respect to dimensional, material and support parameters are derived using adjoint variable method. These operators account for the jump of the slope of a Timoshenko beam or a Reissner plate at the position of concentrated active load or reaction, thus extending the sensitivity operators known in literature. The jump of slope is the effect of shear deformation of the core. Special attention is focussed on sensitivity and optimisation allowing for variable support position and stiffness, because local phenomena observed in supporting area of sandwich plates often initiate failure mechanisms. Introducing optimally located elastic supports allows to reduce the unfavourable influence of temperature on the state of stress. Several examples illustrate the application of derived sensitivity operators and demonstrate their exactness


2008 ◽  
Vol 17 (2) ◽  
pp. 98-107 ◽  
Author(s):  
Martin Salzmann-Erikson ◽  
Kim Lützén ◽  
Ann-Britt Ivarsson ◽  
Henrik Eriksson

Author(s):  
P. M. Vijayakumaran ◽  
C. P. Nagaraj ◽  
C. Paramasivan Pillai ◽  
R. Ramakrishnan ◽  
M. Sivaramakrishna

The nuclear instrumentation systems of the Prototype Fast Breeder Reactor (PFBR) primarily comprise of global Neutron Flux Monitoring, Failed Fuel Detection & Location, Radiation Monitoring and Post-Accident Monitoring. High temperature fission chambers are provided at in-vessel locations for monitoring neutron flux. Failed fuel detection and location is by monitoring the cover gas for fission gases and primary sodium for delayed neutrons. Signals of the core monitoring detectors are used to initiate SCRAM to protect the reactor from various postulated initiating events. Radiation levels in all potentially radioactive areas are monitored to act as an early warning system to keep the release of radioactivity to the environment and exposure to personnel well below the permissible limits. Fission Chambers and Gamma Ionisation Chambers are located in the reactor vault concrete for monitoring the neutron flux and gamma radiation levels during and after an accident.


2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Xiangmin Ren ◽  
Jingwei Yu

Abstract Creativity is one of the core characteristics of talent; for this reason, the creativity development of applied undergraduates should be one of the basic components of their education. This article gives an overview of the meaning of the creativity of applied undergraduates and makes a literature knowledge-mining and expert investigation on the factors affecting the creativity development. We obtained more than 100 influencing factors, filtered out the duplicative factors, and formed the remaining factors into a questionnaire. A survey was conducted among 1460 teachers and students of some applied undergraduates in Heilongjiang Province. By using principal component analysis (PCA) to analyse the questionnaire, the key factors that affect the creativity development of applied undergraduates are obtained, and the key factors are systematically analysed. According to the results of the analysis, the specific ways and methods of the creativity development of applied undergraduates are put forward.


2018 ◽  
Vol 32 (4) ◽  
pp. 410-429 ◽  
Author(s):  
Elizaveta Gaufman

This article argues that a Russian analytical paradigm of carnival culture can help explain the successful presidential campaign of President Donald J. Trump. Russian philosopher and literary critic Mikhail Bakhtin developed the notion of carnival culture while analyzing Francois Rabelais’ work and its connection to the popular culture of Renaissance. Carnival ethos stood in opposition to the ‘official’ and ‘serious’ church sanctioned and feudal culture, by bringing out folklore and different forms of folk laughter that Bakhtin denoted as carnival. Carnival culture with its opposition to the official buttoned-up discourse is supposed to be polar opposite, distinguished by anti-ideology and anti-authority, in other words, anti-establishment – the foundation of Trump’s appeal to his voters. This article examines the core characteristics of carnival culture that defined Trump’s presidential campaign from the start.


Author(s):  
Salman Ahmed ◽  
Minting Xiao ◽  
Jitesh H. Panchal ◽  
Janet K. Allen ◽  
Farrokh Mistree

In this session we describe in four parts the pedagogy and out-comes of a course Designing for Open Innovation designed to empower 21st century engineering students to develop competencies associated with innovating in an inter-connected technologically flat world: 1. Competencies for Innovating in the 21st Century, [1]. 2. Developing Competencies In The 21st Century Engineer, [2]. 3. Identifying Dilemmas Embodied in 21st Century Engineering, [3]. 4. Managing Dilemmas Embodied in 21st Century Engineering - this paper. In the first paper we describe the core characteristics of the engineering in an interconnected world and identify the key competencies and meta-competencies that 21st century engineers will need to innovate and negotiate solutions to issues associated with the realization of systems. In the second paper, we describe our approach to fostering learning and the development of competencies by an individual in a group setting. We focus on empowering the students to learn how to learn as individuals in a geographically distanced, collaborative group setting. We assert that two of the core competencies required for success in the dynamically changing workplace are the competencies to first identify and then to manage dilemmas. In the third paper, we illustrate how students have gone about identifying dilemmas and in the fourth paper how they have attempted to manage dilemmas. In papers three and four students have briefly described the challenges that they faced and their takeaways in the form of team learning and individual learning. In this the last of four papers in this session, we focus on how students learned to manage dilemmas associated with the realization of complex, sustainable, socio-techno-eco systems, namely, energy policy design. The example involves the identification of a bridging fuel that balances environmental, economic and socio-cultural concerns. The principal outcome is clearly not the result attained but a student’s ability to learn how to learn as illustrated through the development of personal competencies in a collaborative learning framework and environment.


Author(s):  
V. Jagannathan ◽  
Usha Pal ◽  
R. Karthikeyan ◽  
Devesh Raj

Loading of seedless thoria rods in internal blanket regions and using them later as part of seeded fuel assemblies is the central theme of the thorium breeder reactor (ATBR) concept [1]. The fast reactors presently consider seedless blanket region surrounding the seeded core region. This results in slower fissile production rate in comparison to fissile depletion rate per unit volume. The overall breeding is achieved mainly by employing blanket core with more than double the volume of seeded core. The blanket fuel is discharged with fissile content of ∼30g/kg, which is much less than the asymptotic maximum possible fissile content of 100g/kg. This is due to smaller coolant flow provided for in the blanket regions. In a newly proposed fast thorium breeder reactor (FTBR) [2], the blanket region is brought in and distributed through out the core. By this the fissile depletion and production rates per unit volume become comparable. The core considered simultaneous breeding from both fertile thoria and depleted uranium and hence the concept can be called as fast twin breeder reactor as well. Sodium is used as coolant. The blanket fuel rods achieve nearly 80% of the seed fuel rod burnup and also contain nearly the maximum possible fissile content at the time of discharge. In this paper a comparison of FTBR core characteristics with oxide and metallic fuel are compared.


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