86,535 research outputs found
Implementation and Preliminary Verification of the RLAP/PARKS Code for Pb-Bi Cooled Subcritical Systems,
No full textEvaluation of safety performances of a superficial disposal facility subject to an aircraft impact and fuel burning
No full textSafety and security aspects are of meaningful importance in the design of nuclear facilities.
In this study, the attention is so focused on the potential damaging effects that a large civilian airplane impact could bring in safety relevant structures, like a superficial repository similar to El
Cabril one.
Safety performances of such a type of superficial disposal facility, subjected to the aircraft impact and fuel burning, have been analysed and discussed.
Conservative assumptions have been made: normal impact on the lateral repository surface, fire scenario based on the amount of fuel burnt.
Load functions (calculated with the Riera approach) and the maximum temperature reached by fuel during its combustion were used as input (boundary condition) in the numerical simulations as well as the damaging phenomena occurring in the concrete structure.
Numerical analyses, by MARC© code, allowed to simulate the thermo-structural performances of the superficial repository.
The obtained results showed that a repository wall thickness, ranging from 0.6 to 0.9 m, is not sufficient to prevent the penetration of wall itself. Despite the ongoing concrete degradation phenomena, the global strength of the repository seemed to be guaranteed
Natural and Gas Injection Enhanced Circulation in a Loop with Variable Friction, GENES4/ANP Int. Conf., Kyoto (Japan) Sept. 15-19, 2003
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Implementation and Preliminary Verification of the RELAP5/PARCS Code for Pb-Bi Cooled Subcritical Systems
No full textIn the framework of the Italian research program on Accelerator Driven Systems funded by MURST (Italian Ministry of the University, Scientific and Technological Research), the feasibility and operability of a Pb-Bi cooled ADS prototype are currently under investigation. Development and validation of a suitable tool for studying the dynamical behavior of such a system during operational transients and accidental sequences are clearly crucial issues among the R&D needs. This paper deals with the activity performed by ENEA and University of Pisa with the aim to implement and qualify the coupled thermal-hydraulic and neutronic code RELAP5/PARCS, initially developed for LWRs, and adapt it to Pb-Bi cooled subcritical systems. According to this goal, Pb-Bi eutectic thermal and physical properties have been added to RELAP5 libraries while PARCS module has been modified in order to have the possibility of taking into account fast spectrum and time-dependent neutron source driven subcritical systems. A preliminary verification of the modified coupled code RELAP5/PARCS has been carried out analyzing some basic transients. In all these cases, even if the transient is originated by a purely thermal-hydraulic or neutronic event, the interaction between thermal-hydraulic and neutronic phenomena has to be properly considered. Although an exhaustive validation of the modified coupled code has still to be performed by comparing the simulated transients with the results provided by subcritical system dedicated neutronic codes and, restricted to the thermal-hydraulic behavior, with the experimental results, it seems possible to state that the modified coupled code RELAP5/PARCS can acceptably describe the dynamical evolution of a Pb-Bi cooled ADS system
Implementation and Preliminary Verification on the RELAP5/PARCS Code for Pb-Bi Cooled Subcritical Systems
No full textVariations on the Author
No full text“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
[Newspaper Clipping: Author Claims Evidence of Second JFK Assassin #1]
No full textNewspaper article titled "Author Claims Evidence of Second JFK Assassin." The article states that author Richard J. Whalen concluded "that there is circumstantial evidence to support the theory of a second assassin in the shooting of President John F. Kennedy.
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