 | Neutron data for accelerator driven systems |
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Different types of accelerator driven systems (ADS) for transmutation of
nuclear waste have been proposed. The most promising one is based on a liquid
Pb-Bi spallation target. The main components to be investigated are the
spallation target, the target-core interface, the core, moderator and coolant,
the support structure and shielding.
Characteristic for this system is that the target and the target-core
interface, the core and the support structures close to the target are
subjected to neutrons of high energies. Energies up to several GeV are
possible, the highest energies hitting the target and target support area.
Just outside the target area the neutron energies range up to a few tens of
MeV, whereas at larger distances from the target the neutron spectrum
approaches that of a conventional fast (or thermal) reactor.
IRMM carries out measurements in the energy range up to 20 MeV. For a complex
system like an ADS, many cross-sections and reaction parameters are important.
The total, capture, elastic and inelastic scattering, and fission cross
sections as well as light charged particle production cross-sections (e.g. for
hydrogen and helium emission) relevant for damage of structural materials are
also of relevance to an ADS.
At IRMM total and capture cross-sections have been measured in the resolved
resonance region for 232Th, 207,208Pb, 209Bi
and 235,238U. A new experiment on 206Pb is on-going.
Inelastic neutron scattering cross-sections have been measured at IRMM for
23Na, 27Al, 52Cr, 56Fe, 58
Ni, 207Pb and 238U. Also (n,2n) reactions have been
measured at GELINA.
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Last Update 10/02/2006
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