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 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

Company Name

ASNR - Autorité de sûreté nucléaire et de radioprotection

Job Title

Stage en radioprotection médicale à la division de Marseille de l'ASNR H/F

Job Description

Job Title: Medical Radioprotection Intern Role Summary: Assist in the systematic analysis of adverse event registries from radiotherapy facilities to identify trends, weak signals, and assess mitigation measures, contributing to national experience reports and control strategies in medical radioprotection. Expectations: Work on a technical, data‑driven project as part of a Master’s or engineering program focused on occupational risk prevention or radioprotection; deliver analysis findings, support reporting and contribute to national knowledge base. Key Responsibilities: - Review and extract data from internal adverse event logs of radiotherapy centres. - Conduct statistical and trend analyses to detect generic patterns and low‑probability signals. - Evaluate existing mitigation actions and their effectiveness. - Compile findings into concise reports for inclusion in the ASNR national experience database. - Provide input to guide future control and monitoring activities. Required Skills: - Strong analytical and quantitative skills. - Proficiency in spreadsheet or database tools (Excel, SQL, or similar). - Understanding of radiotherapy workflows and associated safety procedures. - Ability to interpret and communicate findings clearly. - Attention to detail and systematic documentation. Required Education & Certifications: - Current enrolment in or completion of a Master’s or engineering degree in occupational risk prevention, radioprotection, or a related health‑science field. - Familiarity with regulatory frameworks for radiological safety is advantageous.

Marseille, France

Remote

24-11-2025

Company Name

ASNR - Autorité de sûreté nucléaire et de radioprotection

Job Title

Stage : Évaluation de dose reçue par travailleurs contaminés actinides H/F

Job Description

**Job title** Internship – Radiation Dose Assessment for Workers Contaminated with Actinides **Role Summary** Assist in evaluating long‑term effective dose (50‑year horizon) received by nuclear fuel cycle workers exposed to internal contamination by transuranic actinides (Plutonium, Americium). Use biokinetic and dosimetric reference models (CIPR, SAAM II, ICARE) to refine dose calculations for individuals treated with decontamination agents (e.g., DTPA). Provide descriptive analysis and preliminary biokinetic parameter estimation. **Expectations** - Complete model adaptation and parameter estimation for a set of internal‑contamination cases. - Deliver a descriptive data analysis report and a first‑pass biokinetic model fit for each case. - Contribute to enhancing the accuracy of dose assessment protocols for contaminated workers. **Key Responsibilities** 1. Gather and preprocess biological monitoring data (urine/feces excretion, retention) from contaminated workers. 2. Apply CIPR reference models using SAAM II and ICARE software to calculate effective dose. 3. Adjust biokinetic parameters to fit observed data and improve model precision. 4. Perform statistical analysis and generate visualizations of dose trends and biokinetic behavior. 5. Document methodology, results, and recommendations for model updates. **Required Skills** - Understanding of radiotoxicology and internal dosimetry principles. - Experience with biokinetic or PBPK modeling (highly desirable). - Proficiency in data analysis (e.g., Excel, R, Python, MATLAB). - Familiarity with software SAAM II and/or ICARE (or willingness to learn). - Strong analytical reasoning, attention to detail, and clear scientific communication. **Required Education & Certifications** - Current Master’s level student (M2) or final‑year engineering student in Nuclear Engineering, Radiological Protection, Biomedical Engineering, or related field. - Knowledge of radiation safety and regulatory dose limits is a plus. ---

Fontenay-aux-roses, France

Remote

24-11-2025

Company Name

ASNR - Autorité de sûreté nucléaire et de radioprotection

Job Title

STAGE : Ingénierie sur la migration de gaz dans des matériaux argileux H/F

Job Description

Job title: Internship – Engineering on Gas Migration in Clay Materials Role Summary: Intern will support the GAME (Gas at Micro Scale) project, focusing on experimental validation of a triaxial confinement cell for 5 mm diameter argillite samples under 12 MPa in-situ stress. The role involves performing gas injections, micro‑CT imaging, development of radiation‑transparent strain sensors, and analysis of pore evolution and gas pathways using image‑based techniques and machine learning. Expectations: - Participate in the design, assembly, and calibration of triaxial cell and sensor systems. - Conduct gas injection experiments with scheduled micro‑CT scans. - Analyze 3‑D image data to extract pore geometry, track gas migration, and compute displacement fields via DVC. - Apply machine‑learning methods to improve pore extraction and deformation analysis. - Prepare detailed reports and contribute to manuscript preparation. Key Responsibilities: - Operate triaxial‑cell equipment, ensuring accurate stress application and containment. - Set up and run micro‑CT scans during gas injection periods. - Calibrate strain sensors and integrate sensor data with imaging streams. - Process volumetric images: segmentation, feature extraction, and correlation. - Implement and test AI/ML pipelines for pore and fracture analysis. - Validate experimental protocols against literature and internal benchmarks. - Coordinate with synchrotron facilities (e.g., Soleil) for beamtime access and data collection. - Document experimental procedures, results, and troubleshooting steps. Required Skills: - Strong knowledge of solid mechanics, soil mechanics, or materials science. - Experience with mechanical testing equipment (triaxial rigs, pressure cells). - Proficiency in 3‑D image analysis (e.g., micro‑CT, CT‑image alignment). - Familiarity with digital volume correlation (DVC) tools. - Programming skills in Python or MATLAB, including image processing libraries. - Basic machine‑learning knowledge (scikit‑learn, TensorFlow, PyTorch). - Ability to work independently, manage experimental schedules, and document findings. Required Education & Certifications: - Current M2 (Master’s) student or engineering school candidate in solid mechanics, geotechnical engineering, physics, or materials science. - Minimum GPA of 3.0/4.0 preferred. - No mandatory external certifications required.

Fontenay-aux-roses, France

Remote

25-11-2025