533 resultados para Obserwatorium Astronomiczne UAM


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The aim of this work is to present the Exercise I-1b pin-cell burn-up benchmark proposed in the framework of OECD LWR UAM. Its objective is to address the uncertainty due to the basic nuclear data as well as the impact of processing the nuclear and covariance data in a pin-cell depletion calculation. Four different sensitivity/uncertainty propagation methodologies participate in this benchmark (GRS, NRG, UPM, and SNU&KAERI). The paper describes the main features of the UPM model (hybrid method) compared with other methodologies. The requested output provided by UPM is presented, and it is discussed regarding the results of other methodologies.

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In the framework of the OECD/NEA project on Benchmark for Uncertainty Analysis in Modeling (UAM) for Design, Operation, and Safety Analysis of LWRs, several approaches and codes are being used to deal with the exercises proposed in Phase I, Specifications and Support Data for Neutronics Cases. At UPM, our research group treats these exercises with sensitivity calculations and the sandwich formula to propagate cross-section uncertainties. Two different codes are employed to calculate the sensitivity coefficients of to cross sections in criticality calculations: MCNPX-2.7e and SCALE-6.1. The former uses the Differential Operator Technique and the latter uses the Adjoint-Weighted Technique. In this paper, the main results for exercise I-2 Lattice Physics are presented for the criticality calculations of PWR. These criticality calculations are done for a TMI fuel assembly at four different states: HZP-Unrodded, HZP-Rodded, HFP-Unrodded, and HFP-Rodded. The results of the two different codes above are presented and compared. The comparison proves a good agreement between SCALE-6.1 and MCNPX-2.7e in uncertainty that comes from the sensitivity coefficients calculated by both codes. Differences are found when the sensitivity profiles are analysed, but they do not lead to differences in the uncertainty.

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Contiene: I. Ad Monimum: libri tres; Contra Arcanos; Ad Trasimundum regem; Ad diuersos epistole septem; Ad Donatum ... [et al.]. [9], 414 p. Sign. tip.: a-z8, aa-bb8, cc12 -- II. Opuscula Maxentii Johannis Serui Dei ... Libellus fidei Romae ; Capitula contra nestorianos et pelagianos edita ; Professio breuissima catholicae fidei ... [et al.]. [6], 138 p. Sign. tip.: A-I8

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Moreau, B. Inventaire chronologique des editions parisiennes du XVI siecle, Paris 1972-1985,

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Mode of access: Internet.

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Secu[n]da pars huius operis aurei ornati super euangeliis a die sancto pasche vsq[ue] ad finem totius anni edita ..., en I1, con port. propia.