Category Archives: WORKSHOP ON NUCLEAR REACTION DATA AND. NUCLEAR REACTORS:. PHYSICS, DESIGN AND SAFETY

Segment 3: RESONANCES

The average resonance parameters recommended for RIPL-2 were prepared on the basis of the evaluations performed by the Obninsk group, taking into account the analysis of discrepancies between similar evaluations of other groups. Good agreement was found for Г7 among the three RIPL-1 files (Obninsk, Mughabghab and Beijing) [5]. However, the comparison is less fa­vorable for the neutron strength functions, […]

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Decay Data Libraries

5.5.1. Nuclear structure A number of teams around the world are engaged in the co-ordinated evaluation and compilation of nuclear structure data, under the auspices of the International Atomic Energy Agency. This International Network for Nuclear Structure Data Evaluation generates updated Evaluated Nuclear Structure Data Files (ENSDF), and is responsible for the evaluation of all the mass-chains on a regular […]

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Steam Reforming of Methane

In this method Methane (CH4), a main component of natural gas, and water react at temperatures of 600 — 800 C to produce hydrogen and carbon monoxide and dioxide. The steam reforming system can be easily coupled to a HTGR, which can provide the necessary heat and high temperature. Considerable R&D work has been carried out in Germany for the […]

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DECAY HEAT CALCULATIONS: DATA UNCERTAINTIES

Nuclear data files are normally based on statistical analyses and evaluations of all relevant measured data reported in the open literature. Unfortunately, there may be omissions in the resulting data libraries that need to be filled to avoid serious impact on the ability to undertake the desired calculations with confidence. Setting this issue aside until Sections 4 and 5, some […]

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OECD/NEA Data Bank, Paris

NEA Data Bank has developed and released the JEF-PC program, in co-operation with CSNSM-Orsay and the University of Birmingham. This jointly-developed program generates a “Chart of the Nuclides” format for the display of data from a number of evaluated libraries, including the Joint Evaluated File (JEF-2.2), ENDF/B — VI.4 and JENDL-3.2 supplied on CD-ROM as part of the package. Three […]

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The need for R&D

From what has been seen, NPP’s decommissioning appears to be a mature technology. However, while it is certainly true that we have today available all or most technologies needed to dismantle a NPP and return the site to essentially the initial, undisturbed condition, large margins exist for the process optimization in terms of efficiency, waste generation, occupational doses and especially […]

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Numerical procedure for the Coulomb functions

As discussed below eq. (2.41), all integrals are of short range, therefore the Coulomb functions, fi(r) and gi(r), see eq. (2.3), can be expanded in terms of the functions xv, eq. (2.5), or rv, eq. (2.15), in an appropriately chosen finite interval A. Since fi and gi are solutions to the point Coulomb Hamiltonian, A has to cover the range […]

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Evaluated Fission Yield Libraries

The fission-yield data sets in the most recent evaluations are listed in Table 7. Thermal (T) yields cover all measurements at 0.025 eV, or in well-moderated thermal reactor spectra. Fast (F) yields include all measurements in fast reactor spectra (mean neutron energies of 150-500 keV) and fission neutron spectra (mean energies around 1 MeV and above). H means neutron energies […]

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Gas-cooled Reactors

South Africa, Japan, China and a consortium of US, Russia, France and Japan are developing small gas-cooled reactor designs and technologies. Coated fuel particles are used in these reactors and they retain fission gases even under accident conditions. Modularization, inherent safety characteristics, direct cycle, and high temperature applications have generated renewed interest in High Temperature Gas — cooled Reactors (HTGR). […]

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