Senior Nuclear Radiation Shielding Engineer

Holtec; Comunidad de Madrid; On-site; EUR 110,000 - 170,000; Full time

Job summary

Holtec is seeking a Senior Nuclear Radiation Shielding Engineer in Madrid, Spain, to lead shielding design, source term development, and dose assessment for SMR-300 licensing. The role requires hands-on analysis, model benchmarking, and collaboration with internal teams and the NRC, with mentorship for junior engineers.

The ideal candidate has extensive experience in radiation shielding, regulatory compliance, and proficiency with major transport codes, contributing to PSAR/FSAR preparation and

Qualifications

• Bachelor's degree in Nuclear Engineering, Physics, or closely related field with 10+ years of experience; Master’s 8+ years; PhD 6+ years.
• Experience in radiation shielding design, source term development, and dose assessment.
• Proficiency with radiation transport and dose analysis tools (MCNP, SCALE, ADVANTG, GALE, ARCON96, RADTRAD).
• Familiarity with NRC licensing processes and NUREG-0800 Chapters 11 and 12.
• Strong technical writing and communication skills.
• Programming or scripting experience (e.g., Python).

Responsibilities

• Develop radiation source terms for normal operation, anticipated events, and postulated accidents.
• Perform radiation transport analyses to evaluate dose rates in plant systems, structures, and components.
• Design and optimize shielding to meet occupational dose limits per ALARA.
• Conduct radiological consequences and control room habitability analyses using regulatory methods.
• Evaluate reactor pressure vessel and structural component fluence for shielding and material assessments.
• Benchmark analytical models against experimental data and industry guidance.
• Prepare technical reports and licensing documentation (PSAR, FSAR, RAIs).
• Participate in technical meetings with teams, partners, clients, and NRC.
• Mentor junior engineers and help develop analysis standards and documentation practices.

Skills

Radiation shielding design

Source term development

Dose assessment

Python scripting

Regulatory/licensing experience

Nuclear power plant operations

NRC licensing familiarity

Technical writing

Education

Bachelor's degree in Nuclear Engineering or Physics

Master's degree or PhD in related field

Tools

MCNP

SCALE

ADVANTG

GALE

ARCON96

RADTRAD

Job description

The Senior Nuclear Radiation Shielding Engineer to support the design, analysis, and licensing of the SMR-300, an integral pressurized water reactor small modular reactor. The selected candidate will join an established and growing radiation protection and analysis team supporting SMR-300 development activities, including radiation source term development, shielding design and optimization, dose assessment, and preparation of licensing documentation. This role serves as a hands‑on technical contributor, supporting plant design optimization and regulatory compliance through defensible radiological analyses. This role works independently performing detailed analyses, benchmark methods and models, clearly document results, and mentor junior engineers in analysis techniques and technical documentation.

Location: Madrid, Spain

Primary Responsibilities:

• Develop radiation source terms for normal operation, anticipated operational occurrences, and postulated accident conditions
• Perform radiation transport analyses to evaluate dose rates in plant systems, structures, and components
• Design and optimize radiation shielding to meet occupational exposure and site dose limits in accordance with ALARA principles
• Conduct radiological consequences and control room habitability analyses using accepted regulatory methodologies
• Perform reactor pressure vessel and structural component fluence evaluations to support shielding and material assessments
• Benchmark analytical models against experimental data and industry guidance to ensure technical defensibility
• Prepare technical reports and contribute to licensing documentation, including PSAR, FSAR, and responses to NRC Requests for Additional Information (RAIs)
• Participate in technical meetings with internal teams, partners, clients, and the U.S. Nuclear Regulatory Commission
• Mentor junior engineers and support the development of analysis standards and documentation best practices

Requirements:

• Eligibility to work under U.S. Department of Energy 10 CFR Part 810 export control regulations
• Bachelor’s degree in Nuclear Engineering, Physics, or a closely related field with 10+ years of relevant experience
  • OR Master’s degree with 8+ years of relevant experience
  • OR PhD with 6+ years of relevant experience
• Demonstrated experience in radiation shielding design, source term development, and radiological dose assessment
• Proficiency with radiation transport and dose analysis tools such as MCNP, SCALE, ADVANTG, GALE, ARCON96, RADTRAD, or equivalent codes
• Working knowledge of nuclear power plant operations and radiological protection programs
• Familiarity with NRC licensing processes and NUREG-0800 Chapters 11 and 12 requirements
• Strong technical writing, documentation, and communication skills
• Programming or scripting experience (e.g., Python) to support analysis automation and data processing
• Experience supporting NRC audits, RAIs, and technical review meetings
• Experience integrating shielding design with plant layout and multidisciplinary engineering teams

A Generation Ahead by Design™
Investing in people who power the future.

We believe great work deserves great rewards. Our benefits go beyond the basics, reflecting our commitment to supporting your whole self…your health, your future, and your career growth.

If you’re driven to solve meaningful challenges and make a lasting impact, we invite you to build your career at Holtec-a generation ahead by design™.