ASNR - Autorité de sûreté nucléaire et de radioprotection

About the Company

Depuis le 1er janvier 2025, l'IRSN et l’ASN se sont réunis pour devenir l’Autorité de sûreté nucléaire et de radioprotection (ASNR), créée par la loi du 21 mai 2024 relative à l'organisation de la gouvernance de la sûreté nucléaire et de la radioprotection. Autorité administrative indépendante, l’ASNR assure, au nom de l’État, le contrôle des activités nucléaires civiles et de radioprotection en France. Elle exerce également les missions de recherche, d'expertise, de formation et d’information des publics dans les domaines de la sûreté nucléaire et de la radioprotection.

Listed Jobs

Company Name

ASNR - Autorité de sûreté nucléaire et de radioprotection

Job Title

Stage - analyse de données météorologiques et validation de modèle H/F

Job Description

**Job Title** Internship – Meteorological Data Analysis and Model Validation **Role Summary** A research internship focused on evaluating vertical wind profile formulations for atmospheric dispersion modeling. The candidate will compare various Monin‑Obukhov similarity theory formulations against field measurements, enhance the meteorological pre‑processor (PreMet), and conduct statistical analysis to improve model accuracy for emergency response scenarios. **Expectations** - Demonstrate a strong foundation in fluid dynamics or atmospheric sciences - Apply Python programming to data processing, classification, and statistical evaluation - Present findings to a multidisciplinary research team and contribute to pre‑processor development **Key Responsibilities** - Collect and preprocess wind and temperature observations from ASNR’s Cherbourg dataset - Reconstruct vertical wind profiles using multiple theoretical formulations - Compare reconstructed profiles with measured data to assess validity across different atmospheric conditions - Implement improvements to the PreMet meteorological pre‑processor based on analysis results - Generate graphical and statistical post‑processing outputs to support model validation - Prepare progress reports and present results to research staff; participate in regular team meetings - Coordinate occasional on‑site visits to the Cherbourg measurement facility (travel as required) **Required Skills** - Knowledge of fluid mechanics and/or atmospheric science principles - Proficiency in Python (data manipulation, numerical libraries such as NumPy/Pandas, plotting with Matplotlib/Seaborn) - Experience in data classification, statistical analysis, and visualization - Understanding of Monin‑Obukhov similarity theory and boundary‑layer meteorology (preferred) - Strong analytical problem‑solving and communication skills **Required Education & Certifications** - Current enrollment in a Master’s (MSc) program (equivalent to Master 2), preferably in atmospheric science, fluid dynamics, or related engineering field - No specific certifications required ---

Hauts-de-seine, France

On site

10-11-2025

Company Name

ASNR - Autorité de sûreté nucléaire et de radioprotection

Job Title

Stage M2 / Biologie / CERWO H/F

Job Description

**Job Title** M2 Internship – Biology (Neurotoxicology & Radiotoxicology) **Role Summary** Assist in a research project investigating the combined effects of chemical (tungsten aerosol) and low‑dose ionizing radiation exposure on the rat brain. Conduct in vivo experiments, sample processing, and multiple molecular and histological analyses to evaluate neurovascular alterations and neuronal survival. **Expectations** Produce accurate, reproducible data on biological markers; contribute to drafting experimental reports; adhere to safety and ethical standards for animal work and radioactive materials. **Key Responsibilities** - Design and execute controlled in vivo exposure protocols (tungsten aerosol inhalation and gamma irradiation). - Prepare and section rat brain tissues for histology. - Perform immunohistochemistry to assess vascular and neuronal markers. - Conduct RT‑qPCR for targeted gene expression panels. - Execute Western blotting for protein quantification. - Optionally carry out iDisco tissue clearing and imaging studies. - Quantify results, analyze data statistically, and maintain detailed records. - Draft experiment summaries, figures, and manuscripts or contribution sections. **Required Skills** - Laboratory techniques: tissue fixation, sectioning, IHC, RT‑qPCR, Western blot, optional tissue clearing. - Proficiency with microscope imaging and data analysis software (e.g., ImageJ, Prism). - Knowledge of toxicology, radiobiology, neurobiology, and molecular biology. - Strong attention to detail, documentation, and adherence to SOPs. - Ability to work independently and collaboratively within a multidisciplinary team. **Required Education & Certifications** - Master’s degree (M2) or equivalent in Human & Environmental Toxicology, Neurophysiology, Pathophysiology, Integrative Biology, Neurotoxicology, or Radiotoxicology. - Basic competency in laboratory safety and animal handling regulations.

Fontenay-aux-roses, France

Remote

21-11-2025

Company Name

ASNR - Autorité de sûreté nucléaire et de radioprotection

Job Title

STAGE : Chercheur(se) en physique des rayonnements, neutronique H/F

Job Description

**Job title:** Research Intern – Radiation Physics (Neutron Physics) – UHDR & FLASH Effect **Role Summary:** Conduct research on ultra‑high‑dose‑rate (UHDR) irradiation (FLASH effect) using the Geant4‑DNA Monte Carlo framework. Develop and integrate radio‑chemical models that account for biomolecule reactions and the temporal structure of irradiation, run particle‑beam simulations in C++, and analyze the resulting data to evaluate DNA damage mechanisms. **Expectations:** - Enrolled in the final year of a Master’s program or engineering school in physics or chemistry. - Strong interest and experience in simulation and programming. - Rigorous, self‑motivated, and detail‑oriented with clear communication of results. **Key Responsibilities:** 1. Develop code to integrate a radio‑chemical reaction model that includes biomolecule interactions into Geant4‑DNA. 2. Implement a dynamic approach to model the time structure of UHDR irradiation. 3. Build and run C++ Geant4‑DNA applications to simulate clinical particle‑beam configurations across different radiation qualities. 4. Analyze simulation outputs, quantify direct and indirect DNA damage, and compare with published literature. 5. Critically evaluate discrepancies, propose explanations, and document findings. 6. Collaborate with the research team to refine models and simulation strategies. 7. Prepare technical reports and present results in meetings. **Required Skills:** - Proficiency in C++ programming and experience with the Geant4 toolkit, especially Geant4‑DNA. - Knowledge of Monte Carlo methods in radiation transport and DNA damage simulation. - Understanding of radiation physics, especially high‑dose‑rate phenomena like FLASH. - Familiarity with biomolecular chemistry (lipids, water radicals) relevant to radiation biology. - Ability to analyze large simulation datasets, interpret scientific literature, and articulate results. - Strong written and verbal communication skills in English. **Required Education & Certifications:** - Current enrolment in Master’s (M2) or equivalent engineering program in Physics or Chemistry. - No specific certifications required; coursework in radiation physics, computational physics, or Monte Carlo methods is preferred.

Fontenay-aux-roses, France

Remote

21-11-2025

Company Name

ASNR - Autorité de sûreté nucléaire et de radioprotection

Job Title

Stage BAC+5 vieillissement Pu et radioprotection H/F

Job Description

**Job Title** Postgraduate Internship – Plutonium Aging and Radioprotection (H/F) **Role Summary** Develop a rapid estimation tool for the time‑dependent Evolution of the Dose Equivalent Flow (DED) in plutonium containers. The internship focuses on creating a database of radionuclide contributions using the SERPENT code, developing a Python‑based tool that integrates isotopic composition data and STAMP decay‑filiation calculations, and analyzing the results for future nuclear fuel fabrication facilities. **Expectations** - Construct and maintain a comprehensive database of radionuclides produced by plutonium isotopic progeny. - Implement Python scripts for calculation execution, data extraction, processing, and visualization. - Build a predictive model linking isotope composition to DED evolution over time. - Validate the tool against existing irradiated fuel datasets. - Present findings and recommendations for extending the approach to additional configurations. **Key Responsibilities** 1. Perform SERPENT simulations for each relevant radionuclide in the plutonium isotopic chain. 2. Collect outputs and structure them into a searchable database. 3. Integrate STAMP decay‑filiation code to obtain time‑dependent activity data. 4. Write Python modules to read isotope compositions, query the database, calculate DED, and generate reports. 5. Analyze simulation results, identify trends, and assess radioprotection implications for worker safety. 6. Document methods, assumptions, and tool usage guidelines. 7. Collaborate with research staff to refine modeling assumptions and explore extensions to other fuel types or geometries. **Required Skills** - Proficient in Python scripting for scientific data analysis. - Familiarity with neutronics and radioprotection principles. - Experience with Monte Carlo neutron transport codes (SERPENT) and decay‑filiation tools (STAMP). - Ability to interpret and validate nuclear decay data. - Strong analytical, problem‑solving, and technical writing skills. - Team‑orientated, proactive communication, and project documentation. **Required Education & Certifications** - Master‑level (BAC+5) student or graduate in Neutronics, Radioprotection, Nuclear Energy, or related engineering discipline. - Demonstrated coursework or projects involving nuclear fuel cycle, radiological safety, or computational modelling. - (Optional) Certification or training in nuclear engineering software or radiological protection is an advantage.

Fontenay-aux-roses, France

Hybrid

24-11-2025