{"id":2534558,"url":"https://alion.io/job/mpr-principallead-nuclear-engineer","title":"Principal/Lead Nuclear Engineer","company":{"id":4421283,"name":"MPR","domain":"mpr.com","url":"https://alion.io/company/mpr-3","size_band":"501-1000","is_staffing_agency":false,"employer_type":"direct","is_intermediary":false,"listed_via":null,"ats_vendor":"iCIMS","truth_index":null},"role":"Industrial Engineering","role_family":"Industrial Engineering","seniority":"lead","employment_type":null,"work_mode":"on_site","remote_scope":null,"remote_scope_basis":null,"remote_working_hours":null,"hiring_geo_confidence":"structured","locations":["Alexandria, United States"],"countries":["US"],"hiring_countries":[],"hiring_countries_total":0,"salary":{"min":150000,"max":220000,"currency":"USD","period":"year","gross":null,"usd_annual":220000},"salary_estimate":null,"experience_years_min":15,"visa_sponsorship":false,"relocation_package":false,"has_equity":false,"technologies":[],"status":"live","first_seen_at":"2026-10-14T13:48:44Z","employer_posted_date":"2026-10-14","last_verified_at":"2026-10-15T20:07:47Z","board_verified":true,"closed_at":null,"days_open":1,"trust":{"level":"ok","repost_count":null,"flags":[],"days_open":1},"description":"Overview\nAs a Principal/Lead Nuclear Engineer at MPR, you'll work across advanced fission reactors, operating nuclear plants, and research facilities - bringing your expertise to a diverse range of technologies and reactor concepts. Consulting means no two projects are the same: different clients, different challenges, different problems to solve. It's the kind of breadth that keeps the work engaging and your skills continuously growing.\nYour role will primarily focus on providing subject matter expertise and mentorship to the next generation of nuclear engineering experts and leveraging your experience and connections to capture cutting edge project for MPR. Specifically, your expertise will be invaluable to achieve:\nServing as a subject matter expert on a wide array of nuclear engineering projects\nHelp expand MPR’s network within the nuclear industry, and\nProvide mentorship and guidance to the next generation of nuclear engineers.\nBecause of MPR’s role as trusted partner for virtually all cutting edge advanced nuclear suppliers, project workload will vary significantly over time. Some examples of the types of projects you could support include:\nIndependent evaluation of advanced reactor designs (molten salt, sodium-cooled fast reactors, high-temperature gas reactors, microreactors)\nFusion device thermal and radiological design\nOperating nuclear plant engineering support and analysis (PWR, BWR fleet)\nResearch and test facility design and safety analysis\nLoss of coolant accident analysis and source term evaluation across reactor types\nNovel fuel form and component qualification for multiple technologies\nCriticality safety evaluations for DOE facilities\nIndependent, technology comparison studies for utilities and investors\nThe role requires deep expertise in or an ability to quickly master several nuclear engineering related topics, including neutronics, thermal hydraulics, shielding, fuel and nuclear materials, and radiological consequence evaluation combined with strong communication skills, adherence to best practices, and an eye for growing MPR's portfolio.\nDuties/Responsibilities\nTypical duties for the role will vary based on project and workload at MPR, but will likely include an array of the following:\nTechnical Expertise\nDevelop design/analytical solutions for complex technical challenges across diverse reactor technologies and\nOversee MPR engineers performing neutronics simulations and core design: criticality safety evaluations, critical core configurations, fuel cycle management, activation calculations, radiation detection and shielding analyses: alarm setpoint determination, shielding optimization, ALARA implementation, dosimetry calculations\nReview and validate work performed by other MPR engineers\nChallenge vendor assumptions and verify results using first principles thinking\nBusiness Development\nIdentify and pursue opportunities to grow MPR's project portfolio with existing and new clients\nTake a lead role in client and stakeholder interactions by effectively communicating technical results\nMentorship\nCoach and mentor engineers through execution of complex nuclear analysis work spanning different technical domains and lead by example\nWork with MPR leadership to identify pathways for junior engineers to grow\nQualifications\nCompetitive candidates will have most of the following:\nEducation\nBachelor's degree in Nuclear Engineering or Mechanical Engineering with nuclear concentration\nAdvanced degree (MS or PhD) is a plus but not required\nTechnical Experience\n15+ years of nuclear engineering experience with demonstrated expertise across multiple technical areas (neutronics, thermal-hydraulics, radiation detection, shielding, radiological consequence evaluation)\nProficiency with common nuclear engineering software: MCNP, SCALE, ORIGEN, RELAP, or equivalent tools\nFamiliarity with both light water and non-light water reactor designs, or fusion device thermal and radiological designs\nExperience developing test plans for novel nuclear designs (new fuel forms, components, etc.)\nStrong understanding of NRC regulations and guidance for reactor analysis (e.g., loss of coolant accident analysis methods, source term, licensing basis)\nStrong analytical skills grounded in first principles-not just software proficiency or vendor-specific methodologies\nAbility to work across engineering disciplines to evaluate all facets of technical problems\nDeep understanding of nuclear physics, thermal-hydraulics, materials behavior, and radiological phenomena\nLeadership & Communication Skills\nExcellent verbal and written communication skills-you can explain complex nuclear phenomena to clients, regulators, and non-specialists\nExperience presenting at industry conferences and engaging with external audiences\nProven ability to oversee and mentor less experienced engineers and building teams\nAbility to manage multiple concurrent projects across different reactor technologies and teams\nDemonstrated success building and maintaining client relationships\nExperience identifying and pursuing new business opportunities\nMotivated to tackle unfamiliar problems and take on new responsibilities\nPersistent, questioning attitude-and the ability to accept that in others\nStrong time management and organizational skills\nReceptive to constructive feedback and continuous improvement\nPreferred Experience\nSimilar lead/subject matter expertise from previous job experience\nDirect experience with NRC licensing processes and regulatory interactions\nPublished technical work or conference presentations\nTrack record of successful business development in the nuclear industry\nExperience evaluating multiple competing reactor technologies\nRequired\nThis position must meet Export Control compliance requirements, therefore a “US Person” as defined by 22 C.F.R. § 120.15 is required. “US Person” includes US Citizen, lawful permanent resident, refugee, or asylee.\nLocations: Alexandria VA (HQ), East Lyme CT, Burlington MA, or Salt Lake City UT\nPosition Type: Full-time, exempt\nTravel: 10-20% as required by project assignments, including client sites, test facilities, regulatory meetings, and visits between MPR offices\nCompensation: The salary range for this position is $150,000 to $220,000 annually. Actual compensation is based on several factors, including but not limited to experience, internal parity, education, and skills. We offer comprehensive healthcare benefits (medical, dental, vision), flexible spending accounts and health savings accounts, a 401(k) and profit sharing, as well as paid time off.\nWork Environment: Collaborative and technically rigorous-you'll lead multiple concurrent projects across different reactor technologies, mentor engineers across technical domains, and continuously expand your expertise while maintaining independence from vendor-specific approaches\nAbout MPR\nFounded in 1964, MPR Associates provides independent engineering and consulting services to clients in the power and energy, federal, and life sciences sectors. The firm operates throughout the United States and internationally, making challenging projects successful by delivering safe and reliable technical solutions across the entire project lifecycle. Our independence from any single technology vendor or corporate parent allows us to provide objective technical advice and maintain broad expertise across the nuclear industry.\nWhat truly sets MPR apart from our peers is:\nThe Work: Work across multiple reactor technologies-advanced fission, fusion, operating plants, and research facilities-rather than narrowing into one vendor's design. You'll serve as an independent technical authority using first-principles problem-solving, not repetitive vendor-specific calculations. A broad client base means direct interaction with reactor developers, plant owners, regulators, and research institutions-and insulation from the fate of any single technology. You'll also have autonomy to identify and pursue new projects that align with your expertise and interests.\nThe Culture: Technical rigor and first-principles thinking define MPR's approach-not vendor procedures or corporate mandates. You'll work alongside bright, motivated engineers and project managers across mechanical, civil, electrical, chemical, and materials disciplines. Questioning attitudes and constructive feedback are valued here; technical accuracy matters more than hierarchy. It's a high-performance culture built on trust and respect since 1964.\nCareer Development: Establish yourself as a recognized technical authority across nuclear engineering, not just within one reactor concept. You'll maintain technical breadth that keeps you relevant regardless of which technologies succeed commercially while growing as a leader through mentorship, project management, client engagement, and business development\nMPR Associates, Inc. is an equal opportunity and affirmative action employer, who participates in E-Verify. All qualified applicants will receive consideration for employment without regard to race, color, national origin, sex, religion, age, disability, veteran’s status, sexual orientation, gender identity, genetic information or any other classification as required by applicable laws. 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