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Reactor Physics Jobs (NOW HIRING)

The company's first reactor, Kaleidos, is a 1-megawatt, fail-safe microreactor that can be ... About the Role Radiant is a seeking a Nuclear Engineer, Core Physics responsible for designing and ...

Senior Nuclear Engineer

El Segundo, CA · On-site

$133K - $184K/yr

You will own modeling methods and reactor physics calculations of neutronics parameters such as reactivity, kinetics parameters, and energy deposition distributions used within our cutting-edge ...

Senior Nuclear Engineer

El Segundo, CA · On-site

$133K - $184K/yr

You will own modeling methods and reactor physics calculations of neutronics parameters such as reactivity, kinetics parameters, and energy deposition distributions used within our cutting-edge ...

Nuclear Engineer

Oak Ridge, TN · On-site

$94K - $112K/yr

RESPONSIBILITIES Radiation Transport & Reactor Physics Analysis * Develop, run, and validate radiation transport and reactor physics models using industry-standard tools such as SCALE, MCNP, Serpent ...

Nuclear Engineer

Oak Ridge, TN

$94K - $112K/yr

RESPONSIBILITIES Radiation Transport & Reactor Physics Analysis * Develop, run, and validate radiation transport and reactor physics models using industry-standard tools such as SCALE, MCNP, Serpent ...

Controls Engineer Qualifications -- Experience in nuclear controls, reactor physics, or deeply related advanced engineering domains. -- Bachelor's Degree or higher with strong expertise in reactor ...

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Reactor Physics information

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How much do reactor physics jobs pay per hour?

As of Jul 8, 2026, the average hourly pay for reactor physics in the United States is $20.06, according to ZipRecruiter salary data. Most workers in this role earn between $12.50 and $25.48 per hour, depending on experience, location, and employer.

What are some common challenges faced by professionals working in reactor physics, and how can they be addressed?

Reactor physics professionals often encounter challenges such as ensuring accurate reactor core calculations, adapting to evolving safety regulations, and troubleshooting unexpected operational anomalies. These challenges require a strong foundation in nuclear theory, proficiency with simulation tools, and effective collaboration with engineers, safety analysts, and operations staff. Staying current with industry advancements and participating in ongoing training can help professionals overcome these hurdles and contribute to safe, efficient reactor operations.

What is the difference between Reactor Physics vs Nuclear Engineer?

AspectReactor PhysicsNuclear Engineer
Primary FocusNeutron behavior, reactor core design, and physics calculationsDesign, development, and safety of nuclear systems and reactors
Required CredentialsAdvanced degrees in physics or nuclear engineering, certifications in reactor operationEngineering degrees, professional engineering licenses, certifications in nuclear safety
Work EnvironmentResearch labs, reactor facilities, academic settingsPower plants, research facilities, industry
Industry UsageSpecialized in reactor core physics and modelingBroader nuclear system design and safety analysis

Reactor Physics specialists focus on understanding neutron interactions and reactor core behavior, often working in research or academic settings. Nuclear Engineers have a broader role, encompassing system design, safety, and operational aspects of nuclear reactors. While both roles require advanced education and certifications, Reactor Physics is more specialized in core physics, whereas Nuclear Engineering covers a wider range of nuclear systems and safety protocols.

What are the key skills and qualifications needed to thrive as a Reactor Physicist, and why are they important?

To thrive as a Reactor Physicist, you need a strong background in nuclear engineering or physics, supported by at least a bachelor’s or master’s degree in a relevant field. Familiarity with reactor simulation software (such as MCNP, SCALE, or CASMO), radiation detection instruments, and regulatory standards is essential. Analytical thinking, attention to detail, and strong problem-solving and communication skills help you excel in complex and safety-critical environments. These skills ensure accurate reactor modeling, safe operation, and compliance with stringent nuclear industry regulations.

What is reactor physics?

Reactor physics is the study of the fundamental processes that occur within a nuclear reactor, focusing on how nuclear reactions are initiated, maintained, and controlled. It involves understanding neutron behavior, fission chain reactions, and how these affect reactor design and operation. Reactor physicists use mathematical models and simulations to ensure reactors operate safely and efficiently, and they play a key role in fuel management and regulatory compliance.
What cities are hiring for Reactor Physics jobs? Cities with the most Reactor Physics job openings:
What are the most commonly searched types of Reactor Physics jobs? The most popular types of Reactor Physics jobs are:
What states have the most Reactor Physics jobs? States with the most job openings for Reactor Physics jobs include:
Advanced Reactor Neutronics, Thermal-Hydraulics, Thermo-Mechanical Postdoctoral Researcher

Advanced Reactor Neutronics, Thermal-Hydraulics, Thermo-Mechanical Postdoctoral Researcher

Idaho National Laboratory

Idaho Falls, ID

$105K/yr

Full-time

Medical, Dental, Vision, Retirement, PTO

Posted 9 days ago


Idaho National Laboratory rating

8.8

Company rating: 8.8 out of 10

Based on 16 frontline employees who took The Breakroom Quiz

11th of 103 rated laboratories


Job description

The Idaho National Laboratory is hiring a well-qualified Postdoctoral Research Associate in Nuclear Engineering, Mechanical Engineering, or a comparable discipline for the Materials and Fuels Complex Reactor Engineering group. This postdoctoral researcher will focus on advanced reactor neutronics, thermal-hydraulics, thermo-mechanical, or structural analysis, contributing to reactor design and confirmatory analyses for new nuclear reactor, startup physics testing of advanced reactors, and supporting existing reactor operations. Our team works a 9x80 schedule located out of the Materials and Fuels Complex facility, with every other Friday off.

As a member of the Reactor Engineering group, the candidate will collaborate closely with interdisciplinary teams, including engineering, nuclear safety, and operations, and engaging with external reactor designers and DOE stakeholders to build new and authorize new reactors at INL. The selected candidate will report to the Materials and Fuels Complex (MFC) Reactor Engineering group and the group's professional lead, working under the direction and technical authority of the MFC Design Authority for new reactor systems. 

The candidate is expected to be a strong asset to our engineering team, working effectively both independently and as a team member, taking direction from peers and contributing to technical decisions in accordance with Laboratory policies and procedures.


The position entails writing engineering calculation and analysis reports as well as the potential for publications and presenting at national conferences.
 

Required:

  • PhD in Nuclear Engineering, Mechanical Engineering, or a closely related discipline.
  • PhD requirements must be completed by commencement of appointment and within the previous five years.
  • Demonstrated ability to perform advanced technical analysis in one or more of the following areas:
    • reactor physics or neutronics
    • thermalhydraulics
    • thermomechanical or structural analysis
  • Ability to contribute to confirmatory analyses supporting design acceptance, safetybasis development, and reactor startup planning for advanced reactor systems.
  • Ability to work effectively both independently and as part of an interdisciplinary R&D team supporting reactor operations, design authority activities, and DOE stakeholder interactions.1
  • Demonstrated oral and written communication skills in English, including preparation of technical reports and peerreviewed publications.
  • Ability to obtain and maintain a DOE Q clearance which requires U.S. citizenship.
     

The ideal candidate will possess:

  • Experience with computational reactor analysis tools such as MCNP, SERPENT, SCALE, OpenMC, Abaqus, Ansys, or STARCCM+.
  • Experience with nuclear fuels and materials behavior, core design methodologies, or safetybasis analytical methods.
  • Familiarity with ASME Boiler & Pressure Vessel Code or similar designcompliance frameworks.
  • Experience planning, performing, or analyzing startup physics tests or verification/validation activities for reactor systems.
     

Physical Requirements:

While performing the duties of this classification, the employee is frequently required to stand, walk, sit, stoop, kneel, bend, and work in an office and field/laboratory environment. The job requires hand/finger dexterity to keyboard or type, handle materials, manipulate tools, and reach with hands and arms. The job requires operation of job-related equipment and driving a vehicle. The employee must occasionally lift and/or move up to 35 pounds without assistance. Sufficient visual acuity and hearing capacity to perform the essential functions and interact with the public is required. Reasonable accommodations may be made to enable individuals with disabilities to perform the essential functions.

Job Information:

  • The pay range for this position is $105,144.00 Annually. At Idaho National Laboratory compensation decisions are determined using factors such as education, relevant experience, and other credentials.
  • TDP: This is a testing designated position; you will be required to submit to a pre-employment drug screen and periodic drug testing throughout the term of your employment.

Benefits and Relocation

  • Medical, Dental, Vision, and Flexible Spending Accounts
  • 401(k) with a 4.2% employer contribution and up to 4.8% match (regular positions) or self-contribute access (postdoctoral positions)
  • Paid time off (personal leave)
  • Employee Education Program (tuition assistance for eligible positions)
  • Comprehensive Relocation Package
  • Benefit eligibility subject to multiple factors, including employment status and position classification.

At this time, BEA will not sponsor any H1-B visas obtained outside of the United States of America (U.S.A.), including consular visas.

INL is a science-based, applied engineering national laboratory dedicated to supporting the U.S. Department of Energy's mission in nuclear energy research, science, and national defense. With more than 6,300 scientists, researchers, and support staff, the laboratory works with national and international governments, universities and industry partners to change the world's energy future and secure our nation's critical infrastructure.

INL Mission:

Our mission is to discover, demonstrate and secure innovative nuclear energy solutions, other clean energy options and critical infrastructure.

INL Vision:

Our vision is to change the world's energy future and secure our nation's critical infrastructure.

Selective Service Requirements:

To be eligible for employment at INL males born after December 31, 1959 must have registered with the Selective Service System (SSS). For more information see www.sss.gov.

Equal Employment Opportunity:

Idaho National Laboratory (INL) is an Equal Employment Opportunity (EEO) employer. It is the policy of INL to provide equal employment opportunities to all qualified applicants without regard to race, color, religion, sex, sexual orientation, gender identity, national origin, age, protected veteran or disabled status, or genetic information.

Reasonable Accommodation:

We will ensure that individuals with disabilities are provided reasonable accommodation to participate in the job application or interview process, to perform essential job functions, and to receive other benefits and privileges of employment. Please contact us to request accommodation.

Other Information:

When applying to positions please provide a resume and answer all questions on the following screens. Applicants, who fail to provide a resume or answer the questions, may be deemed ineligible for consideration.

INL does not accept resumes from third party vendors unsolicited.

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About Idaho National Laboratory

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Idaho National Laboratory is a leading multi-disciplinary national laboratory dedicated to supporting the U.S. Department of Energy's missions in nuclear and energy research, science, and national defence. Located in Idaho Falls, ID, US, it operates under the management of Battelle Energy Alliance. Since its inception in 1949, the lab has remained at the forefront of nuclear energy innovations and advancements, providing critical scientific and technological inputs to support national priorities. Guided by its commitment to excellence, innovative research, collaborative partnerships, and integrity, the lab continues to play a vital role in driving America's nuclear and energy future.

Industry

Scientific research and development services

Company size

5,001 - 10,000 Employees

Headquarters location

Idaho Falls, ID, US

Year founded

1949

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