Improved performances of the fast reactor calculational system ERANOS-ERALIB1 due to improved a priori nuclear data and consideration of additional specific integral data

Fort, E.; Rimpault, G.; Bosq, J. C.; Camous, B.; Zammit, Victor A.; Dupont, E.; Jacqmin, R.; Smith, P.; Biron, D.; Verrier, D.

doi:10.1016/s0306-4549(03)00161-0

Cited by 29 publications

(11 citation statements)

References 2 publications

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“…Since integral experiments available cannot distinguish between  and  (PFNS) the possibility of having compensating errors is high. A test on whether PFNS needs to fitted or not (such as in ERALIB1 [13]). It appears that PFNS is a major source of uncertainty and requires to be fitted.…”

Section: Trends For 238 U Inelastic and Capturementioning

confidence: 99%

Trends on major actinides from an integral data assimilation

2020

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The objective of this work is to revisit integral data assimilation for a better prediction of the characteristics of SFR cores. ICSBEP, IRPhE and MASURCA critical masses, PROFIL irradiation experiments and the FCA-IX experimental programme (critical masses and spectral indices) with well-mastered experimental technique have been used. As calculations are performed without modelling errors (with as-built geometries) and without approximations with the TRIPOLI4 MC code, highly reliable C/E are achieved. Assimilation results suggest a 2.5% decrease for 238U capture from 3 keV to 60 keV, and a 4-5% decrease for 238U inelastic in the plateau region. For this energy range, uncertainties are respectively reduced to 1-2% and to 2-2.5% for 238U capture and 238U inelastic respectively. The increase trends on 239Pu capture cross section of around 3% in the [2 keV-100 keV] energy range come from a low PROFIL 240Pu/239Pu ratio C/E. For 240Pu capture cross section, the increase trend of around 4% in the [3 keV-100 keV] energy range goes in the same direction as the recent ENDF/B.VIII evaluation though at a much lower level. The nuclear data uncertainty associated to SFR ASTRID critical mass is reduced to 470 pcm.

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Section: Trends For 238 U Inelastic and Capturementioning

confidence: 99%

Trends on major actinides from an integral data assimilation

2020

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“…ERALIB1 5 is a library resulting from an integral data adjustment whose experimental database includes 355 integral data (critical masses, spectral indices, buckling etc.) coming from 71 distinct experimental programs.…”

Section: Previous Integral Data Assimilation Workmentioning

confidence: 99%

Trends on Major Actinides from an Integral Data Assimilation

2019

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Nuclear data evaluations on major actinides can be improved by integral data assimilation. Appropriate integral measurements with reliable experimental techniques have been selected such as ICSBEP, IRPhE and MASURCA critical masses, PROFIL irradiation experiments and the FCAIX experimental programme (critical masses and spectral indices). Highly reliable analyses are possible with the use of as-built geometries calculated with the TRIPOLI4 Monte Carlo code. The C/E values have been used in an integral data assimilation solving the Bayes equation. The trends on the JEFF3.1.1 235U capture cross section are quite consistent with recent differential measurements. Assimilation results suggest up to a 2.5% decrease for 238U capture from 3 keV to 60 keV, and a 4-5% decrease for 238U inelastic in the plateau region. For this energy range, uncertainties are respectively reduced from 3-4 to 1-2% and from 6-9% to 2-2.5% for 238U capture and 238U inelastic. Results on 239Pu fission cross sections are included in posterior uncertainties. The increase trends on 239Pu capture cross-section is of around 3% in the [2 keV-100 keV] energy range. For 240Pu capture cross section, the increase is of around 4% in the [3 keV-100 keV] energy range and goes in the same direction as a recent evaluation.

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“…Total -2.663E-01 6.293E-01 1.693E-01 -3.248E-02 7.383E-04 1.000E+00 1.501E+00 U-238 -1.911E-01 1.095E-01 9.427E-02 -2.074E-02 6.235E-04 1.758E-01 1.684E-01 Total -2.646E-01 6.305E-01 1.673E-01 -3.163E-02 7.884E-04 1.000E+00 1.502E+00 ( Fort et al (2003)).…”

Section: Clear Criticality Core Configuration Sensitivity and Uncertamentioning

confidence: 99%

The path for innovative severe accident neutronics studies in ZPRs. part I.2 - Interpretation of SNEAK-12A experiment for core disruption in LMFBRs impact of nuclear data uncertainties on reactivity coefficients

Margulis

Blaise

Mellier

et al. 2017

Progress in Nuclear Energy

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The present work details a further investigation of the SNEAK-12A experimental program, which aimed to study material relocation in Sodium Fast Reactors (SFRs) leading to core degradation. The further investigation include sensitivity and uncertainty propagation analysis. In this paper, a comparison is made using two codes, a Monte Carlo based code Serpent 2 and the deterministic system code ERANOS. A sensitivity analysis was made utilizing the two codes, with comparison of two nuclear data libraries (ENDF/B-VII.1 and JEFF-3.1.1). The code-to-code comparison resulted in a very good agreement, while the comparison of libraries showed large discrepancies, manly due to the differences in the sodium cross-section data. The sensitivity analysis, was followed by a complete propagated uncertainty analysis based on the covariance evaluated data available in the COMAC data evaluation. The results of the uncertainties show that there are still large discrepancies linked to the nuclear data. This work is done within the frame work of new core design capacities and new ways of conducting in Zero Power Reactors, such as the ZEPHYR project led independently by CEA.

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Improved performances of the fast reactor calculational system ERANOS-ERALIB1 due to improved a priori nuclear data and consideration of additional specific integral data

Cited by 29 publications

References 2 publications

Trends on major actinides from an integral data assimilation

Trends on major actinides from an integral data assimilation

Trends on Major Actinides from an Integral Data Assimilation

The path for innovative severe accident neutronics studies in ZPRs. part I.2 - Interpretation of SNEAK-12A experiment for core disruption in LMFBRs impact of nuclear data uncertainties on reactivity coefficients

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