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[en] This paper presents an overview of modelling features of the first revision of the V2.1 major version of the European severe accident integral code ASTEC which has been set-up by IRSN and delivered to the ASTEC worldwide community end of 2016. After some generalities concerning the software structure and the packaging of ASTEC V2.1 revision 1, the phenomena addressed by the different modules constitutive of ASTEC are detailed. Finally, perspectives as concerns the development of future versions of ASTEC V2.1 at IRSN are outlined. (author)
[en] The test cases, based on well defined problems with the input data and a exact solutions, are needed for testing of newly developed multigroup diffusion code named TRIGA2D. A number of selected test cases have been calculated with the diffusion code EXTERMINATOR. The additional tests of the program were made, because the result of the calculations showed some discrepancies regarding input numerical parameters. It was observed that the multiplication factor does not converge, if the mesh step is reduced. This shows the numerical instability of the program due to improper computer installation. (author)
[en] Highlights: • Review of the requirements and recommendations for BEPU methodology. • Summary of the advantages and limitations of the current deterministic bounding method for non-LOCA transient analysis. • Description of a pragmatic, graded approach for application of the BEPU methodology to non-LOCA transient analysis. • Proposal for a demonstration case. - Abstract: Since 1990’s, the use of best estimate plus uncertainty (BEPU) methodology is becoming a common practice for large-break Loss-Of-Coolant Accident (LOCA) analysis. However, the development and application of BEPU methodology requires a higher-level requirement on the verification and validation, and uncertainty quantification (VVUQ) of the used calculational method and computer codes. This may result in a high-cost for BEPU methodology development, and hence prevent the industry to take full benefit from the BEPU applications. This paper proposes a pragmatic, graded approach for application of the BEPU methodology to non-LOCA transient analyses.
[en] Steady-state calculations for determination of the global neutron-physics characteristics of the WWER-1000 reactor core, Unit 6, Kozloduy NPP, have been carried out using the 3D diffusion codes PYTHIA-Q and TRAPEZ. The real fuel loading pattern of the reactor core and the implemented operational regimes during the first, second, and third cycles have been taken into account. The program TRLOAD have been used to perform the fuel reloading between any two cycles. Results for the change of the boric acid concentration in the coolant, the fuel burn-up distribution, the power peaking factors, the neutron flux distributions, etc., have been obtained.The calculation results have been compared with operational data. Analysis of the results accuracy for the basic neutron-physics characteristics of the WWER-1000 reactor core obtained using the both diffusion codes,has been made
[en] This document provides the software requirements for a computer code to perform point kinetics-based simulations of nuclear reactor transients. These requirements address all aspects of code development and use, including input and output parameters and structure, software capabilities, and supporting documentation. This software is intended to replace the existing point kinetics code TREKIN, which is currently used for the analysis of the Transient Reactor Test Facility (TREAT).
[en] A very challenging test beam programme is being undertaken by the CALICE collaboration as part of a major R and D directed towards the design of an ILC calorimeter. This design has to be optimized for both performance and cost, where particle flow (PFA) calorimetry and software compensation are the main aim of the studies. This paper will concentrate on describing the experimental set-ups for the 2006, 2007 and 2008 test beams that have been carried out by the CALICE collaboration at CERN and FNAL.
[en] The present paper describes the improvements made to the conversion software for ANSYS APDL 2 FLUENT MHD Magnetic File which is able to extract the data from ANSYS APDL file and write down a file containing the magnetic field data in FLUENT magneto hydro dynamics (MHD) format. The MHD module has some features for the uniform and non uniform magnetic field but it is limited for sinusoidal or pulsed, square wave, having a fixed duty cycle of 50%. The present software, ANSYS APDL 2 FLUENT MHD Magnetic File, suffered major modifications in comparison with the last one. The most important improvement consists in a new graphical interface, which has 3D graphical interface for the input file but also for the output file. Another improvement has been made for processing time, the new version is two times faster comparing with the old one. (authors)