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Opportunities, Proposed PhD Topics

PhD proposal 2022-2025 – IN2P3/LPSC Grenoble

Applications CLOSED

Sensitivities of neutron transport modes with Monte Carlo Methods

 

Despite being the reference neutron transport method, Monte Carlo used to be limited in its capacity to calculate sensitivities (relative change in output associated with a change in input, such as a cross-section), or adjoint-based outputs, such as kinetics parameters (effective delayed neutron fractions, etc.). This has completely changed with the very fast development of perturbation methods and generalization in most of the codes in the last decade [1]. This field is still growing and few researchers have focused on the question of the statistical convergence of those new objects when compared to the large bibliography that exists for other parameters, such as eigenvalues, in particular for problems with high dominance ratios, i.e. when the second eigenvalue is very close from the first one, the inverse of keff. Another very active field of research related to Monte Carlo is its use for the calculation of higher modes than the first eigenvalue or for other modes types. Many applications are based on the use of the modes of different formalisms, which are often “matrix filled” formalisms, i.e. formalisms that use matrices built from Monte Carlo tallies such as “Fission Matrices”. Kinetics calculations are historically based on spectral analysis and can now rely on Monte Carlo associated parameters for which sensitivities are also available [2]. 

The convergence of local variables such as local fluxes in Monte Carlo may be much slower than global ones, e.g. keff. The convergence of their sensitivities with the number of histories simulated is not well known and their actual convergence may be doubtful as it depends on « new » parameters of the Monte Carlo method used for the calculations of sensitivities such as the number of « latent » generations [3]. We expect that the convergence speed of the sensitivities of the modes would be faster, if they could be calculated.

The objective of this project is to work on the combination of the two dynamic fields discussed above and extend the sensitivity capacities of Serpent2 [4] for the calculation of the sensitivities of modes to different perturbations, such as nuclide densities or nuclear data, and to study the convergence speed of those new output parameters.

This PhD is part of the joint “NEEDS” project called SUDEC (Sensitivity Uncertainty comparison for Depletion Calculations) in which CNRS, CEA and IRSN work together to study the propagation of uncertainty in fuel burn-up calculations. Those fuel burn-up calculations rely on the calculation of reaction rates that can be considered as local variables that could be projected on an adequate mode base. The student will then contribute to the project by developing a key component of it and will benefit from the collective work and competencies of the partners.

 

Indicative timeline

 

Year 1

Tools discovery. Convergence tests of sensitivities of existing Serpent 2 outputs.

Preliminary set up of innovative mode calculation sensitivities.

 

Year 2

Development and tests of the performance of the sensitivities of the modes.

Research and set up of reduced models of coupling, with TH and/or depletion.

 

Year 3

End of developments.

In depths studies with the tools developed.
Manuscript and defence preparations.

 

PhD Director

 

Adrien Bidaud has 20 years of experience in the field of nuclear data uncertainty and sensitivities. Besides this research and the associated teaching activities, he also teaches and develops interdisciplinary research projects in long term energy prospective with energy economists. He is the co-chair of the Energy and Nuclear Engineering program of the Engineering school PHELMA of Grenoble Institute of Technology.

 

Laboratoire de Physique Subatomique et Cosmologie (http://lpsc.in2p3.fr)

 

The aim of the research at LPSC is to improve our knowledge about the most elementary particles and about the forces that govern their interactions. It helps to broaden our understanding of the universe, its structure and its evolution. These activities require the development of sophisticated, state-of-the-art instrumentation, a strong theoretical research activity as well as strong modelling competencies that support the experiments during the preparatory stages and during the data analysis.

The research also affects our everyday lives; for example, it enables to come up with innovative solutions in the field of nuclear power or cancer treatment and to train a new generation of researchers, teachers and engineers.

 

Candidates interested in teaching activities may be offered to contribute to the nuclear engineering curriculum of Grenoble Institute of Technologie (school PHELMA) and Université Grenoble Alpes, which include for instance electronics, mathematics, signal processing, nuclear instrumentation lab sessions, numerical methods, numerical methods projects etc.

 

Bibliography

 

[1] “Review of Early 21st-Century Monte Carlo Perturbation and Sensitivity Techniques for k- Eigenvalue Radiation Transport Calculations”, Brian Kiedrowski, Nuclear Science and Engineering, 2017, 185:3, 426-444, https://doi.org/10.1080/00295639.2017.1283153

 

[2] “Perturbation and sensitivity calculations for time eigenvalues using the Generalized Iterated Fission Probability, Alexis Jinaphanh, Andrea Zoia,

2019, Annals of Nuclear Energy, 133, 678-687, https://doi.org/10.1016/j.anucene.2019.06.062

 

[3] « Sensitivity Analysis and Its Convergence Through Monte Carlo Calculations for the UAM GEN-III Benchmark: Application to Power Distributions », Pamela Lopez and Adrien Bidaud, Proceedings of the Conference: Mathematics and Computational Methods Applied to Nuclear Science and Engineering, Raleigh, North Carolina, USA, April 2021

 

[4] “A collision history-based approach to sensitivity/perturbation calculations in the continuous energy Monte Carlo code SERPENT”, Manuele Aufiero et al., Annals of Nuclear Energy, 2015, https://doi.org/10.1016/j.anucene.2015.05.008.

 

Key-words: Neutronics, Nuclear Data sensitivity, Uncertainty analysis, Monte Carlo, Perturbation Theory.

 

Profile: Candidates must have a background in Reactor Physics, with a demonstrated knowledge of Neutron Transport. Some experience in Monte Carlo codes would be an asset.

 

Contact

 

Adrien Bidaud

LPSC – Groupe Physique des Réacteurs

Téléphone : 0476284045 email : bidaud@lpsc.in2p3.fr

THE PHD SHALL START IN: FALL 2022 – TO APPLY, CONTACT PROF. BIDAUD As  Soon As Possible

Studying in Grenoble

 

https://www.univ-grenoble-alpes.fr/education/why-choose-uga/why-choose-uga-713448.kjsp

 

https://international.univ-grenoble-alpes.fr/getting-organized/the-steps-of-your-stay/the-practical-guide-for-international-doctoral-students-795458.kjsp?RH=1611732328710

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Opportunities

Job Opportunity at IAEA, Vienna

IAEA is looking for:

Section Head (Nuclear Security of Materials outside of Regulatory Control) (P5)

Those who are interested to work within the IAEA’s Division of Nuclear Security are encouraged to apply!

  • Organization: NSNS-Nucl.Security of Materials outside of Reg.Control Sec.
  • Primary Location: Austria-Vienna-Vienna-IAEA Headquarters
  • PM Duration in Months: 36
  • Contract Type: Fixed Term – Regular Probation Period: 1 Year

Job Description available for download HERE

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Opportunities, Proposed PhD Topics

PhD positions at SCK CEN

SCK CEN is welcoming PhD Applications until MARCH 23, 2022

Fields are diverse: nuclear technology, materials, radiation protection, waste & disposal, decommissioning, etc…

The list of available topics:

  • 161Tb-labeled radiopharmaceuticals targeting mucin receptors for treatment of pancreatic cancer
  • Advancement of personal neutron dosimetry by establishment of flexible reference simulated neutron workplace fields and computational neutron dosimetry
  • Assessment of out-of-field doses in proton therapy with variation of clinical parameters
  • Deep learning for 3D porous media reconstruction of clay and cement-based materials
  • Development of a Numerical Multi-Physics Method to Analyze the Vibration Characteristics of Rotating Components in Liquid Metal
  • Development of a thorium based target for the production and release of Ac225 at the ISOL facility of MYRRHA
  • Development of fast and sensitive methods for radiotoxicological and biodistribution studies/analyses of radionuclides used in medical applications (e.g. 225Ac)
  • Development of new ligands for selective separation of americium
  • Development of TRNT radiopharmaceuticals targeting Hsp90
  • Evolution of transport, microstructural and hygro-mechanical properties of cementitious materials subjected to coupled chemical degradation via a multiscale approach
  • Experimental analysis of nuclear fuel depletion : method development, validation and uncertainty assessment
  • Fecal microbiotal transplantation as a method for improving the outcomes of the dual radio- and immunotherapies within a colorectal cancer mouse model
  • Finite element investigations of loading rate and crack configuration effects to extract fracture toughness from the Charpy impact test
  • Formation mechanisms of nanovoid and nanobubble superlattices in fissile materials
  • Functional characterization of D630023F18Rik in the DNA damage response and brain development
  • HERMMES – Hadron Energy Resolved Measurement using Magnetic Electron Separation
  • Impact of carbonation on corrosion, mechanical and transport properties of blended cements
  • Improving Nuclear Fuel Microstructure Characterization By Multivariate Statistical Analysis of Scanning Electron Microscopy Data
  • Influence of redox conditions and organic matter on the partitioning and mobility of naturally occurring radionuclides (NOR‘s) in geothermal systems
  • Investigating the radioprotective mechanisms of biotic food supplements using human gut organoids-derived bioreactor
  • Machine learning for accurate and efficient uncertainty quantification in radiological waste characterization
  • Neutron Data Benchmarking at the VENUS-F zero power reactor for MYRRHA
  • Optimization of computational dosimetry of workers in dismantling and decommissioning using machine learning
  • Oxidation and corrosion mechanisms in actinide oxide systems
  • Personal online dosimetry of astronauts using computational methods
  • Photonuclear cross-section measurements for the production of medical radioisotope Actinium-225
  • Quantitative Assessment of Corrosion Products Release Rate in Liquid LBE
  • Shape controlled thorium dioxide precipitation routes
  • Fuel Materials
  • Small-scale mechanical punch testing for fusion and fission structural materials
  • Sorption of radionuclides onto C-S-H and C-A-S-H at various degradation stages
  • Super-resolved analysis of lamin-mediated DNA damage repair after high LET irradiation and its applicability to predictive modelling of individual radiation sensitivity in cancer patients
  • The role of miRNAs in regulating dose rate and plant developmental-dependent responses to gamma-irradiation in rice
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Opportunities

Post-Doc at IJC Lab/ALTO, Orsay – France

Opening for a 2-year postdoctoral researcher at IJC Lab/ALTO, Orsay France, for a candidate in gamma spectroscopy / nuclear fission.

Details can be found here:

https://emploi.cnrs.fr/Offres/CDD/UMR9012-CHRROB-009/Default.aspx?lang=EN

General information

Reference : UMR9012-CHRROB-009
Workplace : ORSAY
Date of publication : Friday, January 14, 2022
Type of Contract : FTC Scientist
Contract Period : 24 months
Expected date of employment : 1 March 2022
Proportion of work : Full time
Remuneration : between €2743 and €3896 depending on experience
Desired level of education : 5-year university degree
Experience required : Indifferent

Missions

The postdoctoral researcher is expected to be involved in the successful installation and running of the nu-Ball2 gamma-ray spectrometer and its associated experimental program in 2022 and 2023. The nu-Ball2 project concerns the construction and deployment of a high-efficiency hybrid Ge/LaBr3 detector for experimental nuclear studies at the ALTO facility of IJC Lab Orsay and is coordinated by Dr. Jon Wilson and Dr. Gabriel Charles.

The successful candidate will be expected to be part of the team which helps run nu-Ball2 experiments at the ALTO within the context of an international collaboration. They will be involved in the analysis of data from one or more of these experiments which are related in particular to the spectroscopy of nuclear fission and nuclear structure studies. along with creativity, implementation of original ideas and the ability to work highly effectively within a small dedicated team.

Additional Information

Please submit a cover letter and CV without any breaks in dates, showing diplomas, titles and work and professional experience along with two letters of recommendation.
The closing date for the receipt of applications is 10/02/2022.
As IJCLab is subjected to ZRR (Zone à Régime Restrictif) military regulation, hiring choices must be approved by the Haut Fonctionnaire Securité Défense (HFSD). Therefore, the date of employment written above should be understood as provisional and may need to be delayed.

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Opportunities

Job Opportunity at IAEA, Vienna

IAEA is looking for:

A “Nuclear Security Officer” (Physical Protection Systems) (P4).

Those who are interested to work within the IAEA’s Division of Nuclear Security are encouraged to apply!

  • Organization: NSNS-Nuclear Material Security Unit
  • Primary Location: Austria-Vienna-Vienna-IAEA Headquarters
  • Job Posting: 2021-12-14, 10:39:03 AM Closing Date: 2022-01-10, 11:59:00 –> still open on IAEA portal until 31 Jan 2022
  • PM Duration in Months: 36
  • Contract Type: Fixed Term – Regular Probation Period: 1 Year

Job Description available for download HERE

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Education and Training courses

Intensive introductory course on the proliferation of nuclear weapons

The Vienna Center for Disarmament and Non-Proliferation (VCDNP) invites graduate and post-graduate students in the fields of IT and engineering to apply for an intensive introductory course on the proliferation of nuclear weapons.

The course will take place from 23 to 25 February 2022 in Vienna, Austria.

The VCDNP will follow the Austrian government regulations regarding in-person events, and all participants should be prepared to show the necessary documentation confirming a low epidemiological risk.

The course is open to students currently enrolled in a European university, pursuing a graduate or post-graduate degree in the field of IT or engineering.

The language of instruction is English; therefore, good English language skills are essential for successful completion of the course.

There is no tuition fee, and the VCDNP will cover accommodation and economy class roundtrip airfare for students travelling from outside Vienna, but within Europe, upon request.

The deadline for applications is 16 January 2022. As space is limited, we recommend that applications be submitted as early as possible. Applications from qualified women are encouraged.

More details on the course and how to apply can be found on the VCDNP website (https://vcdnp.org/the-spread-of-nuclear-weapons-history-threats-and-solutions/) and in the FLYER.

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Opportunities, Proposed PhD Topics

PhD positions at SCK CEN

SCK CEN is looking for 2 PhD researchers in Nuclear Fusion & Geothermal system

1. Advanced microstructural characterization of fusion materials
( based in Mol, but several visits to the ITER site are foreseen)
2. Influence of redox conditions and organic matter on the partitioning and mobility of naturally occurring radionuclides in geothermal systems
(executed in close collaboration with VITO)
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Opportunities, Proposed PhD Topics

PhD position at CEA SERMA

REPRESENTATION OF HOMOGENIZED CROSS SECTIONS BY REDUCED MODELS AND MACHINE-LEARNING FOR MULTI-PHYSICS SIMULATION OF NUCLEAR REACTORS

RESEARCH FIELD: Mathematics – Numerical analysis – Simulation / Engineering sciences

This PhD program focuses on algorithms of machine-learning and data compression for model reduction, in order to optimize the reconstruction of few-group homogenized cross sections used for the computer simulation of nuclear reactors.

These data are fundamental for all coupled multi-physics calculations performed to study reactor design and safety. The use of data assimilation techniques will be considered to enhance the process of cross section preparation by lattice transport computer codes, thus allowing to properly address big data problems.

The improvements sought by the application of innovative mathematical methods aim at achieving a significant reduction in memory storage and in the overall computational time, still ensuring the best accuracy for the reconstructed cross sections.

LOCATION:

Département de Modélisation des Systèmes et Structures
Service des Réacteurs et de Mathématiques Appliquées
Laboratoire de Protection d’Etudes et de Conception
Place: Saclay, France
Start date of the thesis: Sept/Oct 2021

CONTACT PERSON:

Daniele Tomatis, Dr

e-mail : daniele.tomatis@cea.fr

CEA Saclay, France

UNIVERSITY / GRADUATE SCHOOL
Sorbonne Université
Sciences Mathématiques de Paris Centre

Proposal in PDF format, French and English descriptions (one after the other) available for download , HERE