Covariance matrices of the hydrogen neutron cross sections bound in light water for the JEFF-3.1.1 neutron library
| Autor: | Pascal Archier, Gilles Noguere, C. De Saint Jean, Juan Pablo Scotta |
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| Přispěvatelé: | CEA-Direction des Energies (ex-Direction de l'Energie Nucléaire) (CEA-DES (ex-DEN)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA) |
| Rok vydání: | 2017 |
| Předmět: |
Work (thermodynamics)
[PHYS.NUCL]Physics [physics]/Nuclear Theory [nucl-th] Hydrogen Fission Covariance matrix 020209 energy Zero-Variance Penalty chemistry.chemical_element Thermal scattering 02 engineering and technology [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex] Thermal Scattering Law 7. Clean energy 01 natural sciences Nuclear physics 0103 physical sciences 0202 electrical engineering electronic engineering information engineering NJOY Neutron Marginalization Physics 010308 nuclear & particles physics Nuclear data Covariance Nuclear Energy and Engineering chemistry CONRAD LEAPR |
| Zdroj: | Annals of Nuclear Energy Annals of Nuclear Energy, Elsevier Masson, 2017, 104, pp.132-145. ⟨10.1016/j.anucene.2017.01.044⟩ Annals of Nuclear Energy, 2017, 104, pp.132-145. ⟨10.1016/j.anucene.2017.01.044⟩ |
| ISSN: | 0306-4549 |
| Popis: | In the international neutron libraries, the behavior with the energy of the neutron cross sections of hydrogen in light water depends on the Thermal Scattering Laws tabulated in terms of S ( α , β ) . For the Joint Evaluated Fission and Fusion library (JEFF), Mattes and Keinert have established Thermal Scattering Laws by using the LEAPR module of the NJOY code. However, uncertainties on the corresponding S ( α , β ) were never reported. Such missing information was recently calculated with the nuclear data code CONRAD by determining the covariances between the model parameters involved in LEAPR. The obtained uncertainties were propagated to reactivity coefficients calculated for critical assemblies operating in “cold” conditions (temperature below 80 °C) and for PWR in “hot” operating conditions (300 °C). For the integral benchmarks investigated in this work, we found that the uncertainty on the calculated k eff , due to the S ( α , β ) uncertainties, is close to ± 130 pcm at room temperature and ± 50 pcm at 300 °C. |
| Databáze: | OpenAIRE |
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