[en] The pseudo-random number generator (RNG) was written to match needs of nuclear and high-energy physics computation which in some cases require very long and independent random number sequences. In this random number generator the repetition period is about 10³⁶ what should be sufficient for all computers in the world. In this article the test results of RNG correlation, speed and identity of computations for PC, Sun4 and VAX computer tests are presented

[en] A new method of search for the global minimum of one or several values of the function is suggested. The method was successfully approbated on standard test functions. In the case of the NEMO-3 experiment the method has the efficiency of reconstruction of charge particle trajectories close to 100%. The algorithm is also useful for determination of extrema environs. (author)

[en] As a necessary component in the continuous improvement and refinement of methodologies employed in the nuclear industry, regulatory agencies need to periodically evaluate these processes to improve confidence in results and ensure appropriate levels of safety are being achieved. The independent and objective review of industry-standard computer codes forms an essential part of this program. To this end, this work undertakes an in-depth review of the computer code PEAR (Public Exposures from Accidental Releases), developed by Atomic Energy of Canada Limited (AECL) to assess accidental releases from CANDU reactors. PEAR is based largely on the models contained in the Canadian Standards Association (CSA) N288.2-M91. This report presents the results of a detailed technical review of the PEAR code to identify any variations from the CSA standard and other supporting documentation, verify the source code, assess the quality of numerical models and results, and identify general strengths and weaknesses of the code. The version of the code employed in this review is the one which AECL intends to use for CANDU 9 safety analyses. (author)

[en] Participation of JINR specialists in the CMS experiment at LHC requires a wide use of computer resources. In the context of JINR activities in the CMS Project hardware and software resources have been provided for full participation of JINR specialists in the CMS experiment; the JINR computer infrastructure was made closer to the CERN one. JINR also provides the informational support for the CMS experiment (web-server http://sunct2.jinr.dubna.su). Plans for further CMS computing support at JINR are stated

[en] Collaboration is an increasingly important aspect of magnetic fusion energy research. With the increased size and cost of experiments needed to approach reactor conditions, the numbers being constructed has become limited. In order to satisfy the desire for many groups to conduct research on these facilities, we have come to rely more heavily on collaborations. Fortunately, at the same time, development of high performance computers and fast and reliable wide area networks has provided technological solutions necessary to support the increasingly distributed work force without the need for relocation of entire research staffs. Development of collaboratories, collaborative or virtual laboratories, is intended to provide the capability needed to interact from afar with colleagues at multiple sites. These technologies are useful to groups interacting remotely during experimental operations as well as to those involved in the development of analysis codes and large scale simulations The term ''collaboratory'' refers to a center without walls in which researchers can perform their studies without regard to geographical location - interacting with colleagues, accessing instrumentation, sharing data and computational resources, and accessing information from digital libraries [1],[2]. While it is widely recognized that remote collaboration is not a universal replacement for personal contact, it does afford a means for extending that contact in a manner that minimizes the need for relocation and for travel while more efficiently utilizmg resources and staff that are geographically distant from the central facility location, be it an experiment or design center While the idea of providing a remote environment that is ''as good as being there'' is admirable, it is also important to recognize and capitalize on any differences unique to being remote [3] Magnetic fusion energy research is not unique in its increased dependence on and need to improve methods for collaborative research Many research disciplines find themselves in a similar position, trying to better utilize facilities and increase productivity for both local and remote researchers A recently published issue of Interactions [4] includes a special section dedicated to collaboratories A description of collaborative observations at the Keck Observatory [2] indicates distinct and real advantages gamed by astronomers who can now remotely access this facility, even as the collaboratory is developing. Advantages range from simply making the facility available to more researchers without the cost of travel to the physiological advantage of not experiencing oxygen deprivation sickness due to high altitude observing The Upper Atmospheric Research Collaboratory [2] which focuses on studies of the earth's ionosphere and interactions with the solar wind now combines information from several observing sites, many in difficult to reach high latitude locations above the arctic circle Travel to these remote locations, fomrerly provided by military flights which are no longer needed, is now more expensive for researchers With a now obvious need for remote sensing and collaborations, the UARC has combined access to these experimental facilities and joined in global modeling efforts to better use the capabilities of researchers on an international scale. The final collaboratory featured [2] is that of our testbed development for the DIII-D tokamak experiment 141 to make it even more accessible in its

[en] In September 1996, the 'hybrid reactor' group started a study program of this type of reactor, using Monte Carlo calculations with MCNP code. We report here on the first part of this program which is devoted to the definition of needed characteristics for a pilot unit to be demonstrative, in view of an industrial use for either waste incineration or energy production. (authors)

[en] Several computer codes in the nuclear field have been vectorized, parallelized and transported on the FUJITSU VPP500 system and/or the AP3000 system at Center for Promotion of Computational Science and Engineering in Japan Atomic Energy Research Institute. We dealt with 14 codes in fiscal 1997. These results are reported in 3 parts, i.e., the vectorization part, the parallelization part and the porting part. In this report, we describe the parallelization. In this parallelization part, the parallelization of cylindrical direct numerical simulation code CYLDNS44N, worldwide version of system for prediction of environmental emergency dose information code WSPEEDI, extension of quantum molecular dynamics code EQMD and three-dimensional non-steady compressible fluid dynamics code STREAM are described. In the vectorization part, the vectorization of multidimensional two-fluid model code ACE-3D for evaluation of constitutive equations, statistical decay code SD and three-dimensional thermal analysis code for in-core test section (T2) of HENDEL SSPHEAT are described. In the porting part, the porting of transient reactor analysis code TRAC-BF1 and Monte Carlo radiation transport code MCNP4A on the AP300 are described. In addition, a modification of program libraries for command-driven interactive data analysis plotting program IPLOT is described. (author)

[en] The set of functions (vi-programmes) was described in this work, resolving to build the I/Q subsystem for control of the devices plugged to one or several CAMAC crates working under the control of the communication controller KK011 and interface board PI021. (author)

[en] The software of computer-aided system for control of the ECR-ion source was described and intended for remote control over the heavy ions axial injection plant, automatic getting of ions spectrum from the ion source and ions spectrum processing. (author)

[en] The Aster code is a 2D or 3D finite-element calculation code for structures developed by the R and D direction of Electricite de France (EdF). This dossier presents a complete overview of the characteristics and uses of the Aster code: introduction of version 4; the context of Aster (organisation of the code development, versions, systems and interfaces, development tools, quality assurance, independent validation); static mechanics (linear thermo-elasticity, Euler buckling, cables, Zarka-Casier method); non-linear mechanics (materials behaviour, big deformations, specific loads, unloading and loss of load proportionality indicators, global algorithm, contact and friction); rupture mechanics (G energy restitution level, restitution level in thermo-elasto-plasticity, 3D local energy restitution level, KI and KII stress intensity factors, calculation of limit loads for structures), specific treatments (fatigue, rupture, wear, error estimation); meshes and models (mesh generation, modeling, loads and boundary conditions, links between different modeling processes, resolution of linear systems, display of results etc..); vibration mechanics (modal and harmonic analysis, dynamics with shocks, direct transient dynamics, seismic analysis and aleatory dynamics, non-linear dynamics, dynamical sub-structuring); fluid-structure interactions (internal acoustics, mass, rigidity and damping); linear and non-linear thermal analysis; steels and metal industry (structure transformations); coupled problems (internal chaining, internal thermo-hydro-mechanical coupling, chaining with other codes); products and services. (J.S.)