Neutron Capture and Total Cross-Section Measurements and Resonance Parameters of Gadolinium

Leinweber, G.; Barry, D. P.; Trbovich, M. J.; Burke, J. A.; Drindak, N. J.; Knox, H.D.; Ballad, R. V.; Block, Robert C.; Danon, Y.; Severnyak, LI

doi:10.13182/nse05-64

Cited by 114 publications

(61 citation statements)

References 18 publications

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“…Again, the Gd cross sections have been revised after the present calculations were made, which may change the calculated neutron spectrum and thereby change partially the results for Gd pins. 18) Larger deviations have also been highlighted for HELIOS1.6 (up to 4.1%), essentially close to the Hf-vertex.…”

Section: U-capture Rate (C 8 ) Distributionmentioning

confidence: 81%

“…Recently, it has been found that the revised data for the cross sections for Gd isotopes may alter the latter conclusion. 18) Finally, certain additional sensitivity studies have been presented. These have shed light on some of the possible causes of the observed discrepancies and have, in particular, underlined the importance of an accurate representation of the control blade position.…”

Section: Discussionmentioning

confidence: 99%

“…In the light of these negative deviations, it is interesting to observe that, based on recent measurements, the important 157 Gd thermal capture cross sections should be decreased by 11% with respect to their values applied in existing nuclear data evaluations, i.e., the data used for the present code validation. 18) This change in the basic nuclear data would tend to increase the calculated fission power in Gd pins and thereby decrease the observed deviations between code predictions (PHOENIX and MCNPX) and the PROTEUS experimental data. However, the deviations associated with PHOENIX predictions appear to be not entirely explainable just with this element, further investigations being needed.…”

Section: Total Fission Rate (F Tot ) Distributionmentioning

confidence: 99%

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Experimental Validation of Reaction Rate Distributions for a SVEA-96+ BWR Assembly with Hafnium Control Blades

Plaschy

Murphy

Jatuff

et al. 2009

Journal of Nuclear Science and Technology

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The accurate estimation of reactor physics parameters related to the presence of cruciform absorber blades in boiling water reactors (BWRs) is important for safety assessment and for achieving flexible operation during the cycle. Characteristics that are affected significantly include distributions of the total fission (F tot ) and 238 U capture (C 8 ) rates for controlled regions. Representative experimental investigations have been performed in the framework of the LWR-PROTEUS programme. In particular, the LWR-PROTEUS I-2A experiments concerned the neutronics characterisation of a SVEA-96+ BWR assembly controlled with a hafnium (Hf) blade under full-density water moderation conditions. The current paper presents the comparisons of the measured F tot and C 8 pin-wise distributions with a variety of stochastic and deterministic calculations: (a) MCNPX2.5 using recent nuclear data libraries (JEFF-3.1, ENDF/B-VI.8, and JENDL-3.3), (b) PHOENIX4 using ENDF/B-VI.3, (c) BOXER using JEF-1, (d) CASMO4 using JEF-2.2, and (e) HELIOS1.6 using ENDF/B-VI.1. The calculation/experiment comparisons show standard deviations from 1.2% (MCNPX2.5) up to 1.9% (BOXER) for the prediction of the F tot distribution, the highest individual discrepancy (7.6% with BOXER) being seen close to the ''Hf-vertex.'' The C 8 comparisons show systematically better agreement than those of F tot , the lowest standard deviations being 1.0% (BOXER) and the highest only 1.4% (HELIOS). In addition, sensitivity studies highlight the greater importance of modelling aspects, compared with that of nuclear data libraries, for the achievement of satisfactory and validated F tot and C 8 predictions.

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Section: U-capture Rate (C 8 ) Distributionmentioning

confidence: 81%

Section: Discussionmentioning

confidence: 99%

Section: Total Fission Rate (F Tot ) Distributionmentioning

confidence: 99%

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Experimental Validation of Reaction Rate Distributions for a SVEA-96+ BWR Assembly with Hafnium Control Blades

Plaschy

Murphy

Jatuff

et al. 2009

Journal of Nuclear Science and Technology

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“…A set of resonance parameters for gadolinium up to 300 eV as well as a more detailed description of the present measurements is available in References [2,3]. Twenty-eight resonances were introduced that were not included in ENDF.…”

Section: Epithermal Resultsmentioning

confidence: 99%

“…The effort was optimized by the use of isotopically-enriched samples, diluted liquid samples, combined transmission and capture measurements, and Bayesian analysis using the SAMMY [1] computer program. A detailed description of these measurements and analyses is given in References [2,3]. Gadolinium has the highest thermal cross section of any natural element.…”

Section: Introductionmentioning

confidence: 99%

Resonance Parameter Measurements and Analysis of Gadolinium

Leinweber¹,

Barry²,

Trbovich³

et al. 2006

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The purpose of the present work is to measure the neutron cross sections of gadolinium accurately. Gd has the highest thermal absorption cross section of any natural element. Therefore it is an important element for thermal reactor applications Neutron capture and transmission measurements were performed by the time-of-flight technique at the Rensselaer Polytechnic Institute (RPI) LINAC facility using metallic and liquid Gd samples. The liquid samples were isotopically-enriched in either Gd has been measured to be 11% smaller than that calculated from ENDF/B-VI updated through release 8. Thermal capture cross sections and capture resonance integrals for each isotope as well as elemental gadolinium are presented.In the epithermal region, natural metal samples were measured in capture and transmission. Neutron interaction data up to 300 eV have been analyzed. Substantial improvement to the understanding of gadolinium cross sections is presented, particularly above 180 eV where the ENDF resolved region for 155 Gd ends.

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Boron‐Based Hybrid Nanostructures: Novel Applications of Modern Materials

Zhu

Yan

Maguire

et al. 2011

Hybrid Nanomaterials

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Neutron Capture and Total Cross-Section Measurements and Resonance Parameters of Gadolinium

Abstract: -Neutron capture and transmission measurements were performed by the time-of-flight tech

Cited by 114 publications

References 18 publications

Experimental Validation of Reaction Rate Distributions for a SVEA-96+ BWR Assembly with Hafnium Control Blades

Experimental Validation of Reaction Rate Distributions for a SVEA-96+ BWR Assembly with Hafnium Control Blades

Resonance Parameter Measurements and Analysis of Gadolinium

Boron‐Based Hybrid Nanostructures: Novel Applications of Modern Materials

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