Nuclear Lead

Fuel Performance Lead

Blykalla AB

Help Us Prove a New Standard in Nuclear Fuel Are you a technically sharp, self-driven engineer or scientist who understands how nuclear fuel really behaves - and how to prove it with credible models? Join Blykalla and lead the fuel development and qualification effort that underpins the use of a novel nuclear fuel in an advanced reactor. This role puts you at the center of predicting, validating, and defending fuel behaviour for the western world’s first lead-cooled SMR. You’ll own the delivery of the fuel qualification programme, and strongly influence the development of models and codes that allow for producing regulator-ready evidence to understand our fuel performance. What we do at Blykalla At Blykalla we are developing the next generation of nuclear technology with our Advanced Small Modular Reactor (SMR), based on uranium nitride fuel and a compact, lead-cooled design. As Sweden’s only SMR developer, we are on a mission to decarbonize heavy industry and other energy-intensive sectors and deliver safe, scalable, and sustainable energy. What you’ll get to do Your mission is to ensure that we can predict, explain and justify fuel behaviour with confidence, using validated models, defensible assumptions and traceable data. Build & evolve fuel performance models ● Take ownership of the development, extension, and adaption of fuel performance models for a lead-cooled fast-spectrum operation, with a focus on physical mechanisms rather than black-box use. ● Lead the benchmarking of models against multiple fuel types (including nitride, oxide and metallic fuels) and fuel performance codes, to support comparison, validation, and fallback options. ● Understand and improve model behaviour by analysing why models work, where they break down, and what must be changed for lead-cooled fast spectrum operation. ● Work closely with experimental and design teams to specify experimental testing (in- and out-of-pile) and examinations that generate data relevant for model validation or development. Shape data, experiments, and model credibility ● Define what experimental and operational data are needed to support, challenge, and improve fuel performance models ● Work closely with experimental and design teams to specify irradiation tests and pre- and post-irradiation examinations that generate data relevant for model validation or development ● Integrate data from experiments, literature, and historical programmes to calibrate models, assess validity ranges, and reduce key uncertainties ● Contribute to cross-disciplinary activities between reactor physics, thermal hydraulics, materials, backend, safety and licensing to ensure design coherence, manufacturability, and regulatory compliance. Align modelling with fuel qualification, licensing and industrialisation ● In collaboration with the Head of Fuel and wider fuel team, drive forward the company's advanced fuel qualification and update our plans for how the company will meet them. ● Define, maintain and own the modelling basis used in fuel qualification, including scope, gaps, assumptions, acceptance criteria, and regulatory expectations ● Coordinate with international labs and irradiation facilities to secure the knowledge and services (irradiation, PIE) needed to reach qualification and licensing goals. ● Ensure Blykalla is pro-active in interfacing with regulatory bodies and relevant programs that support advanced fuel qualification/performance modelling (including, but not limited to: SSM, DOE/NRC and IAEA). ● Contribute to the establishment of modelling workflows, documentation, and quality practices that ensure traceability, reproducibility, and regulatory readiness Fuel Design & Development ● With the Head of Fuel and Head of Nuclear Safety, coordinate cross-disciplinary integration of the fuel design between nuclear design, thermal-hydraulics, materials group, fuel experimental and modelling teams to ensure design coherence, consistent modelling assumptions, manufacturability, and regulatory compliance." Technical leadership ● With the Head of Fuel, support the transfer of knowledge and development of the next generation of “subject matter experts” across both fuel performance authorities or cross-disciplinary technical leadership. ● Provide technical mentorship to early career individuals, disseminating your experience and knowledge. Experience & Qualifications ● At least 15-years post-degree experience in nuclear fuel modelling, development and/or qualification. ● Modelling and simulation experience covering code/model modification, development or critical assessment rather than “black-box” use ● Degree, ideally PhD in nuclear engineering, physics, chemistry or a closely related field ● Experience defining and integrating experimental data from irradiation tests, post-irradiation examinations, literature, or historical programmes to support and improve modelling and accelerate fuel qualification ● Ability to define what data and experiments are needed to support model credibility and uncertainty reduction, and to work effectively with experimental and qualification teams ● Demonstrated ability to understand fuel behaviour at the mechanism level and to diagnose why models work, where they fail, and how they must be improved ● Hands-on experience with fuel performance codes such as TRANSURANUS, FRAPCON/FRAPTRAN, BISON, or similar tools, including extending, adapting, or validating models ● Understanding of how modelling contributes to fuel qualification, safety arguments, and regulatory submissions ● Ability to communicate and defend modelling assumptions, limitations, and results in technical discussions with regulators, authorities, and partners ● Fluency in English; Swedish is an advantage ● Willingness to travel within Europe, North America and occasionally beyond ● Eligibility to work with nuclear materials in Sweden Location The position is based in Stockholm. Travel to partner sites and research facilities will be part of the role.

Business Development Lead

Hexium

Hexium is developing advanced nuclear fuel cycle capabilities that support energy security, industrial resilience, and next-generation nuclear deployment. We are seeking a senior commercial leader to build and lead Hexium's commercial operations and strategic partnerships. In this role, you will drive market adoption and industry confidence by securing foundational customer relationships, negotiating long-term commercial agreements, and cultivating strategic partners whose participation strengthens our technical credibility and accelerates deployment readiness. The ideal candidate understands how long-cycle, highly regulated infrastructure markets evolve and has a demonstrated track record of developing customer relationships, structuring complex commercial arrangements, and navigating strategic partnerships in industrial or energy-sector environments. WHAT YOU'LL DO Strategic Partnerships & Ecosystem Cultivation: Originate, cultivate, and manage high-value relationships across the nuclear fuel cycle, advanced reactor ecosystem, utilities, national laboratories, and key federal stakeholders, including the Department of Energy (DOE/NNSA). Secure anchor partners whose alignment enhances Hexium’s technical credibility, market positioning and deployment readiness.  Commercial Architecture & Pipeline Management: Design and implement a rigorous, institutionalized commercial pipeline. Define deal stages, build forecasting models, and establish commercial operating discipline to an engineering-first environment. Market Analysis & Intelligence: Conduct sophisticated assessments of global fuel cycle markets, uranium enrichment trends, and HALEU demand to inform pricing strategy, evaluate competitive dynamics, and anticipate regulatory developments. Translate customer feedback and market intelligence into actionable recommendations for executive decision-making and long-term deployment planning. Complex Contract Structuring & Negotiation: Lead the structuring, negotiation, and execution of long-term commercial agreements, including MOUs, LOIs, off-take arrangements, and SWU contracting frameworks. Cross-Functional Orchestration: Partner with Legal, Regulatory, Finance, Engineering, and Quality Assurance teams to ensure all commercial initiatives match technical timelines, risk thresholds, financial modeling, and export control regulations.  Market Positioning & Industry Engagement: Collaborate with leadership on market positioning, external communications, and stakeholder engagement initiatives that strengthen Hexium's commercial and technical credibility. Represent the company at industry conferences, customer engagements, government meetings, and other high-profile forums to advance strategic objectives and reinforce Hexium's leadership in the nuclear fuel cycle ecosystem. REQUIREMENTS * Bachelor's degree in business, economics, finance, or a related field * 10+ years of experience in business development, commercial strategy, or sales leadership * Demonstrated success developing commercial opportunities and advancing complex, multi-year agreements in regulated, capital-intensive industries * Experience building and managing commercial pipelines and forecasting processes * Experience negotiating complex commercial agreements involving multiple stakeholder groups * Strong market analysis capability, including assessment of customer demand, competitive dynamics, pricing, and regulatory factors * Existing relationships across the nuclear fuel cycle, federal ecosystem, utilities, reactor developers, or strategic industrial partners * Exceptional capability to articulate complex technical, financial, and regulatory concepts into clear, compelling narratives  * Ability to travel as required * This role will be exposed to export-controlled information and requires compliance with applicable export control laws and regulations PLUSES * Direct experience within: * Nuclear fuel cycle * Uranium enrichment * HALEU markets * DOE or NNSA programs * National laboratories * Advanced reactor companies * Experience scaling commercial functions in an early-stage company * Familiarity with SWU markets and fuel contracting structures * Experience supporting project financing or infrastructure capital formation * Supply chain acumen BENEFITS * Stock Options * Paid Time Off * 401(k) Matching * Medical, Dental, Vision insurance * HSA & FSAs   E-Verify: Hexium Inc. participates in E-Verify. All new hires are required to complete the I-9 employment eligibility verification form and provide documentation to confirm their identity and authorization to work in the United States. Screening: Employment is contingent upon successful completion of a background check. Please note this job description is not designed to cover or contain a comprehensive listing of activities, duties or responsibilities that are required of the employee for this job.  Hexium Inc. is an Equal Employment Opportunity Employer. We provide equal employment opportunities to all employees and applicants for employment and prohibit discrimination and harassment of any type without regard to race, color, religion, age, sex, national origin, disability status, genetics, protected veteran status, sexual orientation, gender identity or expression, or any other characteristic protected by federal, state, or local laws. Hexium Inc. is committed to ensuring equal access and providing reasonable accommodations for applicants and employees with disabilities upon request. If reasonable accommodation is needed to participate in the job application or interview process,  please contact Hexium’s Human Resources at HR@hexium.com.

Rotating Machine Lead Engineer

Blykalla AB

What we do at Blykalla Blykalla is a Swedish deep-tech company at the forefront of the nuclear industry, pioneering the development of small modular reactors that provide clean, safe, and reliable energy. Thanks to lead-cooling, we achieve high safety in a very compact format, allowing for a simple and cost-effective design that can be mass-produced. Our unique reactor design will provide safe and green baseload energy that perfectly complements solar and wind power. What you’ll get to do As a Rotating Machine Lead Engineer, you will own the rotating equipment portfolio of the SEALER plant — from the Primary Coolant Pumps (PCPs) submerged in molten lead above 400 °C, where conventional bearing and sealing solutions don't apply, to the secondary-side feedwater and condensate pumps and the full set of auxiliary and safety-related pumps the plant requires. It is a technically demanding portfolio that spans genuinely novel engineering on the primary side and rigorous nuclear-grade discipline throughout: Define functional and design requirements for the full rotating equipment portfolio — PCPs in molten lead, secondary-side feedwater and condensate pumps, and all auxiliary, safety-related, and service pumps. Develop design basis documentation and lead trade-off studies on pump configuration, drive arrangement, sealing strategy, and bearing technology. Set priorities across the portfolio — distinguishing where Blykalla-specific engineering is warranted from where standard industrial solutions suffice. Act as Blykalla's technical counterpart to pump suppliers and engineering partners, challenging design choices and steering solutions to fit plant requirements across hydraulics, sealing, materials, and maintainability. Define the scope of hydraulic, rotordynamic, and structural analyses; brief specialists; and critically review their outputs. Use hand calculations to sanity-check results. Own supplier work packages: evaluate proposals, lead design reviews, and keep pump development aligned with plant requirements and schedule. Support test rig development when needed to advance tailor-made pumping solutions. Collaborate across internal teams and with academic and industrial partners. Who’ll you’ll get to work with The Rotating Machine Lead Engineer sits in the Fluid Systems Engineering Team within Blykalla, and reports to the Manager of Fluids Engineering. We are a diverse team that is passionate about our work and Blykalla. Who you are You will be part of a highly skilled team with a can-do attitude. We value personnel chemistry and strive to create a workplace where you enjoy coming to. There are however a few things that we think will help for you to succeed in this role, these are: More than 5 years of professional experience as a rotating equipment engineer. Degree in mechanical, energy, nuclear, or a closely related discipline. A meaningful portion of your experience at a pump manufacturer or rotating equipment OEM, ideally in a role combining hydraulic and mechanical design with workshop and field interface, or equivalent experience as a discipline lead on the operator or EPC side. Strong working knowledge of centrifugal and/or axial pump design, including rotordynamics, bearing selection, mechanical seals or seal-less concepts, and applicable design codes and standards such as API 610, API 682, ASME III, PED, or RCC-M. Hydraulic and mechanical fundamentals sufficient to steer and critically review calculations performed by specialists, including the ability to perform hand calculations on head, NPSH, power, and basic rotordynamics to sanity-check results. Comfort writing clear technical specifications, reviewing supplier deliverables critically, and managing a multi-vendor technical dialogue from concept through qualification. Familiarity with CAD tools and engineering software. Fluent in English, spoken and written. Fluency in Swedish is a plus. Meritorious skills: Hands-on experience with heavy liquid metal pumps (lead, lead-bismuth, sodium). Experience with reactor coolant pumps in light-water reactors. Experience with high-pressure feedwater or boiler feed pumps in conventional or nuclear steam plants. Familiarity with magnetic drives, canned-motor pumps, or other seal-less concepts. Experience with rotordynamic, CFD, or FEA analyses; the priority is the ability to define, commission, and review such analyses rather than execute them. Prior experience coordinating multidisciplinary design work or managing supplier technical interfaces. If you are not sure that you are 100% qualified but are up to the challenge, we encourage you to apply. Location This position is for our office in Stockholm. So, what do you think? Take the chance to be at the forefront of revolutionizing nuclear power. Join our team as Rotating Machine Lead Engineer and help shape the energy landscape of tomorrow. Apply today with your resume and a cover letter highlighting your relevant experience and achievements. We are proud to foster an inclusive workplace free from discrimination. We strongly believe that diversity of experience, perspectives, and background will lead to a better environment for our employees and a better product. This is something we value deeply and we encourage everyone to be a part of changing the way the world thinks about power supply! We do not accept applications via email. We are not open to external help from recruitment agencies.