A5048074729- Nuclear reactor physics and engineering
- Nuclear Physics and Applications
- Particle physics theoretical and experimental studies
- High-Energy Particle Collisions Research
- Quantum Chromodynamics and Particle Interactions
- Nuclear Materials and Properties
- Nuclear physics research studies
- Nuclear and radioactivity studies
- Dark Matter and Cosmic Phenomena
- Graphite, nuclear technology, radiation studies
- Computational Physics and Python Applications
- Radiation Detection and Scintillator Technologies
- Scientific Research and Discoveries
- Neutrino Physics Research
- Particle Detector Development and Performance
- Atomic and Subatomic Physics Research
- French Historical and Cultural Studies
- Magnetic confinement fusion research
- Fusion materials and technologies
- Historical Studies and Socio-cultural Analysis
- Nuclear Engineering Thermal-Hydraulics
- Radioactivity and Radon Measurements
- Astrophysics and Cosmic Phenomena
- Particle accelerators and beam dynamics
- Probabilistic and Robust Engineering Design
Commissariat à l'Énergie Atomique et aux Énergies Alternatives
2015-2024
CEA DAM Île-de-France
2020-2024
CEA Paris-Saclay
1996-2023
Université Paris-Saclay
1996-2023
CEA Grenoble
2022
Direction des énergies
2012-2021
CEA Cadarache
2012-2021
Connecticut Education Association
2021
Institut d'Etudes Politiques de Paris
2018
Centre d’histoire de Sciences Po
2018
Abstract The joint evaluated fission and fusion nuclear data library 3.3 is described. New evaluations for neutron-induced interactions with the major actinides $$^{235}\hbox {U}$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msup><mml:mrow /><mml:mn>235</mml:mn></mml:msup><mml:mtext>U</mml:mtext></mml:mrow></mml:math> , $$^{238}\hbox /><mml:mn>238</mml:mn></mml:msup><mml:mtext>U</mml:mtext></mml:mrow></mml:math> $$^{239}\hbox {Pu}$$...
The CIELO collaboration has studied neutron cross sections on nuclides that significantly impact criticality in nuclear technologies - 235,238U, 239Pu, 56Fe, 16O and 1H with the aim of improving accuracy data resolving previous discrepancies our understanding. This multi-laboratory pilot project, coordinated via OECD/NEA Working Party Evaluation Cooperation (WPEC) Subgroup 40 support also from IAEA, motivated experimental theoretical work led to suites new evaluated libraries accurately...
A better knowledge of $(n,xn)$ reaction cross sections is important for both modeling and energy applications. This article focuses on inelastic scattering neutrons off $^{238}\mathrm{U}$ which improvements are needed to constrain evaluations solve inconsistencies in nuclear power reactor calculations. new precise measurement $(n,xn\ensuremath{\gamma})$ has been performed at the GELINA (Geel Electron LINear Accelerator) neutron facility operated by EC-JRC-Geel (Belgium) with GRAPhEME...
An uncertainty propagation methodology relying on marginalization techniques was recently developed to produce covariance matrices between existing model parameters involved in describing neutron-induced reactions. This work has been implemented the nuclear data assimilation tool CONRAD. The performance of code demonstrated through simplified test cases based a Reich-Moore description 155Gd(n,γ) reaction. Results are compared with those produced via Monte Carlo techniques.
This paper highlights the strong need for precise nuclear structure and decay data measurements in order to perform high-quality modelling on reactors other applications. The context of evaluation, as well importance low uncertainty evaluations, will be first presented. such interpreting experimental is stressed throughout. To demonstrate this, we explain how mass charge-dependent fission yields, (in particular purpose residual heat calculations), inelastic neutrons scattering cross section...
The status of the Joint Evaluated Fission and Fusion file (JEFF) is described.JEFF-3.1 comprises a significant update actinide evaluations, materials evaluations that have emerged from various European nuclear data projects, activation library JEFF-3.1/A, decay fission yield sub-libraries, fusion-related files EFF project.The revisions were motivated by availability new measurements, modelling capabilities trends integral experiments.Validations been performed, mainly for criticality,...
The evaluation of neutron cross sections in the low energy range (electron volt, mega-electron-volt) is based on formal nuclear models having different types parameters. Some them may be fitted to reproduce experimental datasets giving rise an adjusted covariance matrix. In this paper, a Monte Carlo method presented properly consider influence remaining parameters, priori uncertainties, parameters covariances. This exact mathematical description using conditional probabilities. To explain...
As model parameters, necessary ingredients of theoretical models, are not always predicted by theory, a formal mathematical framework associated to the evaluation work is needed obtain best set parameters (resonance optical fission barrier, average width, multigroup cross sections) with Bayesian statistical inference comparing theory experiment. The rule related this methodology estimate posterior density probability function solving an equation following type: pdf(posterior) ∼ pdf(prior) ×...
The development of a software tool (CONRAD) was initiated at CEA/Cadarache to give answers various problems arising in the data analysis nuclear reactions.This is then characterized by handling uncertainties from experimental values covariance matrices for multi-group cross sections.An object oriented design chosen allowing an easy interface with graphical input/output and being natural framework innovative models (Fission).The major achieved developments are model describing channels,...
The CONRAD code is an object-oriented software tool developed at CEA since 2005. It aims providing nuclear reaction model calculations, data assimilation procedures based on Bayesian inference and a proper framework to treat all uncertainties involved in the evaluation process: experimental (statistical systematic) as well parameter uncertainties. This paper will present status of CONRAD-V1 developments concerning theoretical aspects. Each development illustrated with examples calculations...
The drug Primodos and other hormone pregnancy tests (HPTs) remained on the British market for about a decade after they were first implicated, in 1967, as possible cause of birth defects.In November 2017, an expert working group (EWG) set up by Medicines Healthcare Products Regulatory Agency (MHRA) concluded against such association.However, it was explicitly 'not within remit EWG to make formal conclusions or recommendations historical system regulatory failures', situation that has left...
AbstractA new method to produce covariance or dispersion matrices for the resonance parameters of neutron cross sections was developed. The technique uses shape analysis in association with Monte Carlo treatment uncertainties. implemented error propagation tool MCFIT. This program provides a user-friendly textual interface code REFIT. It designed take into account main sources uncertainties involved time-of-flight measurements. Its capability is illustrated simultaneous 237Np capture and...
This paper presents simple models developed to generate covariances between observable and latent variables. The methodology consists of using “variance penalty” terms as a measure the contribut...
Nuclear data used in designing of various nuclear applications ( e.g ., core design reactors) is improved by using integral experiments. To utilize the past critical experimental to reactor work, a typical procedure for adjustment based on Bayesian theory (least-square technique or Monte-Carlo). In this method, parameters are optimized inclusion information inference. The selection experiments availability well-documented specifications and data. Data points with large uncertainties...