CIELO Collaboration Summary Results: International Evaluations of Neutron Reactions on Uranium, Plutonium, Iron, Oxygen and Hydrogen

Chadwick, M.B.; Capote, R.; Trkov, A.; Herman, M.; Brown, David; Hale, Gerald M.; Kahler, Albert C.; Talou, P.; Plompen, A.; Schillebeeckx, P.; Pigni, Marco T.; Leal, L.C.; Danon, Y.; Carlson, A.D.; Romain, P.; Morillon, B.; Bauge, E.; Hambsch, F. J.; Kopecky, S.; Giorginis, G.; Kawano, Toshihiko; Lestone, J. P.; Neudecker, Denise; Rising, Michael Evan; Paris, Mark W.; Nobre, G. P. A.; Arcilla, R.; Cabellos, Ó.; Hill, Ian; Dupont, E.; Koning, A. J.; Cano‐Ott, D.; Mendoza, E.; Balibrea, J.; Paradela, C.; Durán, I.; Qian, Jing; Zhang, Ge; Liu, T.; Lu, Haijiao; Ruan, Xichao; Haicheng, W.; Sin, M.; Noguère, G.; Bernard, D.; Jacqmin, R.; Bouland, O.; Jean, C. De Saint; Pronyaev, V.G.; Ignatyuk, A. V.; Yokoyama, Kenji; Itō, Makoto; Fukahori, Tokio; Iwamoto, Nobuyuki; Iwamoto, Osamu; Kunieda, Satoshi; Lubitz, C.R.; Salvatores, M.; Palmiotti, G.; Kodeli, I.; Kiedrowski, Brian C.; Roubtsov, D.; Thompson, I. J.; Quaglioni, Sofia; Kim, H.I.; Lee, Y.O.; Fischer, U.; Simakov, S.P.; Dunn, Michael E.; Guber, K. H.; Damián, José Ignacio Márquez; Cantargi, F.; Sirakov, I.; Otuka, Naohiko; Daskalakis, A.; McDermott, B.; Marck, S. C. van der

doi:10.1016/j.nds.2018.02.003

Cited by 86 publications

(45 citation statements)

References 54 publications

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“…4 can be confirmed by comparing the experimental capture cross section ratio R = 238 U(n, γ)/ 235 U(n, γ) obtained by Wallner et al [60] for an average energy of ∼ 25.3 keV with the one derived from the CIELO(IAEA) and JEFF-3.3T4 files. Using the energy distribution reported in the EXFOR data library, a ratio of R CIELO = 0.57 is obtained from the CIELO(IAEA) file [13,15]. This ratio is within the uncertainty in agreement with the experimental value of R exp = 0.60 ± 0.03 [60].…”

Section: Validation Of the Endf-6 Filementioning

confidence: 60%

“…The results of the present work have been included in the evaluated data file for neutron induced reactions on 238 U reported by Capote et al [13]. The file was developed at the IAEA as part of the CIELO (Collaborative International Evaluated Library Organization) project [14,15]. The objective of CIELO is to produce general purpose nuclear data files that are world-wide recognised with a focus on six high-priority nuclides, i.e.…”

Section: Introductionmentioning

confidence: 99%

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Evaluation of cross sections for neutron interactions with 238U in the energy region between 5 keV and 150 keV

et al. 2017

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Cross sections for neutron interactions with 238 U in the energy region from 5 keV to 150 keV have been evaluated. Average total and capture cross sections have been derived from a least squares analysis using experimental data reported in the literature. The resulting cross sections have been parameterised in terms of average resonance parameters maintaining full consistency with results of optical model calculations by using a dispersive coupled channel optical model potential. The average compound partial cross sections have been expressed in terms of transmission coefficients by applying the Hauser-Feshbach statistical reaction theory including width-fluctuations. A generalized single-level representation compatible with the energy-dependent options of the ENDF-6 format has been applied using standard boundary conditions. The results have been transferred into a full ENDF-6 compatible data file.

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Section: Validation Of the Endf-6 Filementioning

confidence: 60%

Section: Introductionmentioning

confidence: 99%

Evaluation of cross sections for neutron interactions with 238U in the energy region between 5 keV and 150 keV

et al. 2017

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“…is obtained by a transformation of from the alpha laboratory framework to the neutron laboratory framework using equation (2). φ c * is the surface wave function for the channel c and is the internal eigenfunction related to the energy .…”

Section: Direct Kinematics Calculations According To the 16 O(nα) 1cmentioning

confidence: 99%

“…(201 E Web of Conferences https://doi.org/10.1051/e onf /20192 PJ pjc 9) 211 0 0 01 11020 WONDER-2018 20 1 discussions within CIELO [1,2] project. In 2014, the CIELO team summarized the situation [1] pointing out 30% of discrepancies between lower (IRMM 2008 [3], Harrisopulos 2005 [4]) and higher (original Bair and Haas [5]) cross section trends.…”

Section: Introductionmentioning

confidence: 99%

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Testing Compound Nucleus Hypothesis Across the ¹⁷O Nucleus Excitation

2019

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The excited compound nucleus 17 O* has been studied over (n,α) and (α,n) cross sections modelling, respectively for 16 O and 13 C targets in their ground states. The modelling is fulfilled within the Reich-Moore formalism. We were able to calculate the (α,n) cross section by two separate ways: the direct kinematic standard route and by inversion of the (n,α) cross section using the compound nucleus hypothesis. Resonance parameters of the resolved resonance range (0 to 6 MeV) were borrowed from the CIELO project. In a first stage, the modelling is carried out in the referential of the incident particle (either way neutron or α) requesting conversion of the CIELO neutron-type resonance parameters to the α-type. In a second stage, the implementation is uniquely designed in the center of mass system of the excited compound nucleus. The resonance parameters are thus converted in that unique reference framework. The present investigation shows the consistency of the kinetic transformation that relies on the compound nucleus hypothesis.

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3D Analysis of a multipurpose modular reactor for small energy production

Şahi̇n¹,

Şarer

2020

Int J Energy Res

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Summary The Fixed Bed Nuclear Reactor (FBNR) is a modular reactor for small energy needs (70‐120 MWel). FBNR is pressurized water reactor, but uses GEN‐IV reactors fuel. UO2 kernels of 500 μm diameter with 25 μm thick SiC cladding are embedded in graphite matrix form the spherical fuel elements with a diameter of 15 mm and covered by 300 μm thick Zircaloy‐4 cladding. FBNR has high level safety features and operates without On‐site Refueling. Approximately 1.62 million spherical fuel elements are suspended in a core height of 200 cm and inner and outer diameters of 32 cm and 224 cm by upwards flowing light water coolant with 280°C entry and 340°C exit temperatures. The unit lattice geometry is dodecahedron with fuel element in center and surrounded with light water coolant‐moderator.In the present work, 9% enriched UO2 fuel is used. Neutronic analysis has been performed with the MCNPX‐2.7.0 code. As, it is not practical to tackle millions of fuel elements separately, at first run unit fuel cell calculations are performed in spherical geometry for one single lattice consisting of separate fuel, cladding and volume‐equivalent moderator regions. In the second run, the fuel cell is homogenized. Infinite cell calculations have been executed for variable moderator/fuel (H/235U) ratios in order to determine under‐ and over‐moderated criticality values. The criticality values for the homogenized cell geometry are slightly lower and remains <5% range, that is, on the conservative side, which is acceptable for the purpose of this study. This allows us to homogenize the entire core for the full 3‐D reactor with core and reflector regions. Reactor criticality increases with increasing H/235U ratios in the, under moderated region, where H/235U = 18 is selected for further investigations. Temporal variation of the reactor criticality is pursued for full reactor power of 210 MWth (~70 MWel net) with keff = 1.36 at the beginning of life down to keff = 1.02 over 1260 days with a plant factor of 1.0. The final fuel burn up was found as 57.3 GWd/ton.

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CIELO Collaboration Summary Results: International Evaluations of Neutron Reactions on Uranium, Plutonium, Iron, Oxygen and Hydrogen

Cited by 86 publications

References 54 publications

Evaluation of cross sections for neutron interactions with 238U in the energy region between 5 keV and 150 keV

Evaluation of cross sections for neutron interactions with 238U in the energy region between 5 keV and 150 keV

Testing Compound Nucleus Hypothesis Across the ¹⁷O Nucleus Excitation

3D Analysis of a multipurpose modular reactor for small energy production

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CIELO Collaboration Summary Results: International Evaluations of Neutron Reactions on Uranium, Plutonium, Iron, Oxygen and Hydrogen

Cited by 86 publications

References 54 publications

Evaluation of cross sections for neutron interactions with 238U in the energy region between 5 keV and 150 keV

Evaluation of cross sections for neutron interactions with 238U in the energy region between 5 keV and 150 keV

Testing Compound Nucleus Hypothesis Across the 17O Nucleus Excitation

3D Analysis of a multipurpose modular reactor for small energy production

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Testing Compound Nucleus Hypothesis Across the ¹⁷O Nucleus Excitation