Validation of Neutron Data for Pb and Bi Using Critical Experiments

Tsiboulia, A. M.; Khomyakov, Yu. N.; Koscheev, Vladimir Nikolaevich; Kochetkov, A. L.; Matveenko, I. P.; Михайлова, И. В.; Semenov, M. Yu.; Lopatkin, A. V.; Smirnov, V. S.

doi:10.1080/00223131.2002.10875272

Cited by 4 publications

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“…(7.6). As discussed in previous studies [11,12], this fact provided valuable knowledge that an improvement of the inelastic scattering cross sections around a few MeV neutron energy region of 206 Pb and 207 Pb had been pointed out importantly in the difference between JENDL-3.3 and JENDL-4.0 libraries through the analyses of the Pb void reactivity in the JAEA ADS model [10] and of the Pb reflector effect on SEG experiments through JENDL-4.0 benchmarks [12]. From the results of ENDF/B-VII.0, a small effect of the difference was compared inversely with that in JENDL-4.0 about 20 pcm in all cases, with regard to Pb isotopes and 27 Al, but not to 235 U and 238 U, although the total difference between JENDL-4.0 and ENDF/B-VII.0 was slight.…”

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confidence: 63%

Neutronics of Lead and Bismuth

Pyeon

2021

Accelerator-Driven System at Kyoto University Critical Assembly

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Cross-section uncertainties of Pb and Bi isotopes could consequently affect the precision of nuclear design calculations of preliminary analyses, before the actual operation of upcoming ADS, since Pb and Bi are composed partly of coolant material (lead-bismuth eutectic: LBE) in ADS facilities. The main characteristics of LBE in ADS are recognized as follows: chemically inactive; high boiling point mechanically; excellent neutron economy caused by large scattering cross sections. From the viewpoint of neutronics, LBE exerts considerable impact on nuclear design parameters for numerical simulations of neutron interactions of Pb and Bi isotopes. As a suitable way of investigating cross-section uncertainties, sample reactivity worth measurements in critical states are considered effective with the use of reference and test materials in a zero-power state, such as a critical assembly, because integral parameter information on cross sections of test materials can be acquired experimentally. For the required experimental study on Pb and Bi nuclear data uncertainties, the sample reactivity worth experiments are carried out at the KUCA core by the substitution of reference (aluminum) for test (Pb or Bi) materials, and numerical simulations are performed with stochastic and deterministic calculation codes together with major nuclear data libraries.

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