Nuclear HVAC & Ventilation Engineer

Blykalla is developing next-generation nuclear technology through the SEALER program, requiring structured and evidence-based technology maturation across multiple concurrent development streams. We are looking for a Senior Systems Engineer who will define and evolve the framework for Technology Readiness Levels (TRL), Technology Readiness Assessments (TRA), and Technology Maturation Planning across the portfolio. This role ensures that SEALER technologies progress from concept to deployable system in a coherent, traceable, and strategically well-aligned way. WHAT WE DO AT BLYKALLA Blykalla is developing the next generation of nuclear technology with our Small Modular Reactor (SMR) based on innovative fuel, materials, and reactor designs. As Sweden’s only SMR developer, we are on a mission to decarbonize industries and enable safe, scalable, and sustainable energy solutions. Our technology uses uranium nitride fuel and lead coolant, creating novel challenges and opportunities for the fuel cycle and supporting systems. What You’ll Get to Do As Senior Systems Engineer – Verification & Validation, you will define and support how technologies mature across the SEALER portfolio. You will establish the framework that connects Technology Readiness, verification and validation approaches, and product development milestones into a coherent and traceable system. Your responsibilities will include: Technology Maturation & Readiness * Define SEALER’s TRL framework and facilitate Technology Readiness Assessments (TRA) across programs. * Identify critical technologies and characteristics that influence system maturity and risk. * Develop and maintain Technology Maturation Plans (TMP) together with system engineers and subject matter experts. Verification & Validation Strategy * Define how analysis, inspection, testing, and demonstration activities contribute to structured TRL advancement. * Establish method selection and qualification approaches aligned with system architecture. * Coordinate maturation efforts and validation resources across concurrent SEALER development streams. Verification, Validation & Qualification Governance * Integrate Technology Maturation Plans into the Integrated Product Development Roadmap (IPDR). * Ensure readiness progression aligns with stage-gates and V-model design milestones. * Support Design Verification Planning (DVP), maturation reviews, and structured progression between development phases. WHERE THIS ROLE CAN TAKE YOU You will play a key role in shaping how SEALER technologies mature from early-stage concepts to fleet deployment. As the V&V organization grows, this role can evolve into functional leadership of Advanced Validation Engineers or broader portfolio-level technical leadership within SEALER’s development. WHO YOU ARE You are a systems-oriented engineer who enjoys working at the intersection of technology development, validation, and structured product maturation. You bring technical depth, a thoughtful and structured approach, and the ability to understand and translate engineering topics into clear and actionable maturation pathways across a portfolio. We are looking for someone who: * A relevant engineering degree (nuclear, aerospace, mechanical, systems engineering, or similar). * Experience with Technology / Manufacturing Readiness Levels (TRL / MRL), Technology Readiness Assessments (TRA), or similar readiness frameworks. * Background in systems engineering and structured product development. * Experience in (S-/D-) FMEAs and identifying critical technologies and defining structured maturation and design verification/validation plans (DVP&R). * Understanding of stage-gate models, concurrent engineering, and V-model development. If you don’t meet all of these requirements, we still encourage you to apply! As a person: * You have the ability to structure complex topics and use analytical thinking. * You communicate well and can effectively speak across disciplines and programs. * It's beneficial with a background in nuclear, aerospace, or other highly regulated industries * Comfortable contributing in a dynamic and evolving development environment. LOCATION The position is based in Stockholm, with travel to Oskarshamn and partners expected.

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 Blykalla is developing and commercializing lead-cooled Small Modular Reactors (SMRs) to provide safe, reliable, and fossil-free energy. Our mission is to deploy advanced nuclear technology that enables the decarbonization of industry and supports long-term energy security. As we advance toward deployment of our first commercial reactors, we are expanding our electrical engineering capability to develop and own the electrical architecture of our plants. While key Balance of Plant (BoP) systems will be designed with engineering partners, Blykalla will retain ownership of the overall electrical design philosophy, requirements, system architecture, and integration. We are seeking a Senior Electrical Engineer to lead the development of the electrical power system architecture for Blykalla's lead-cooled SMR plants. This role combines hands-on power system engineering with technical leadership and systems integration. You will be responsible for developing the electrical design basis for the plant, performing and overseeing power system studies, defining requirements for external engineering partners, and ensuring that delivered designs meet Blykalla's technical, operational, safety, and licensing requirements. KEY RESPONSIBILITIES Plant Electrical System Architecture * Develop the overall electrical system architecture for Blykalla's reactor plants. * Define the plant distribution philosophy covering: * Grid connection * Generator systems * Auxiliary power systems * Emergency power systems * Station blackout provisions * Black-start strategies * AC and DC systems * UPS systems * Define interfaces between Nuclear Island and Balance of Plant electrical systems. * Establish design standards and engineering specifications for future reactor deployments. Power System Studies Perform and oversee electrical studies including: * Load flow studies * Short-circuit studies * Protection coordination studies * Arc flash studies * Motor starting studies * Harmonic analysis * Dynamic and transient stability studies * Voltage regulation studies * Grid compliance studies * Earthing and grounding studies * Reliability and availability assessments * Develop and maintain plant electrical models using tools such as: ETAP, DIgSILENT PowerFactory, PSCAD, SKM, EasyPower, PSS®E Nuclear Island Electrical Design Lead the design of electrical systems within the Nuclear Island, including: * HV, MV, and LV distribution systems * Reactor auxiliary power systems * Safety-related power systems * DC systems and battery systems * UPS systems * Electrical equipment layouts * Earthing and lightning protection systems * Electrical interfaces with instrumentation and control systems * Electrical support for reactor startup, operation, and shutdown modes Engineering Partner Management * Develop technical requirements and design specifications for external engineering partners. * Review and approve electrical deliverables produced by EPCs, consultants, and design houses. * Ensure partner designs comply with Blykalla requirements and applicable standards. * Manage technical interfaces across multiple disciplines and suppliers. * Lead design reviews, HAZOPs, and multidisciplinary engineering workshops. Licensing & Safety Support * Support development of nuclear licensing documentation. * Contribute to safety analyses involving electrical systems. * Support deterministic and probabilistic safety assessments. * Provide technical input to regulators, independent reviewers, and certification bodies. * Develop electrical system design documentation supporting future licensing activities. Grid Integration * Lead grid connection studies and utility interactions. * Define grid code compliance requirements. * Support negotiations with transmission and distribution system operators. * Develop requirements for plant electrical performance under grid disturbances and abnormal operating conditions. WHO YOU’LL GET TO WORK WITH The Senior Electrical Engineer sits in the Plant Engineering Team within Blykalla, and reports to the Plant engineering manager. 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 in order for you to succeed in this role, these are: * MSc or BSc in Electrical Engineering, Power Systems Engineering, or related discipline. * Minimum 8–10 years of experience in electrical power system engineering. * Experience designing HV, MV, and LV electrical systems for industrial facilities, power plants, or large infrastructure projects. * Proven experience performing power system studies. * Experience developing electrical design specifications and reviewing contractor deliverables. * Experience coordinating multidisciplinary engineering activities. * Fluent in English, spoken and written * Fluency in Swedish is a plus Technical Skills * Power system analysis * Electrical distribution systems * Protection and control systems * HV, MV, and LV equipment * Transformers * Switchgear * Generators * UPS systems * Battery systems * Grounding and lightning protection * Grid interconnection requirements * Experience with at least one major power systems analysis tool: ETAP, DIgSILENT PowerFactory, PSCAD, SKM, EasyPower, PSS®E Strong understanding of: * IEC electrical standards * IEEE power system standards * Electrical safety standards * Functional requirements development * Design verification and validation processes LOCATION  This position is for our office in Stockholm. SO, WHAT DO YOU THINK? Don't miss the chance to be at the forefront of revolutionizing nuclear power. Join our team as Senior Electrical 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! Reference & Background Checks As part of our recruitment process, we conduct background checks on all candidates. We may also conduct reference checks to gain a well-rounded understanding of your professional experience, performance, and ways of working. This includes both references provided by you and, where relevant, conversations with other professional contacts who have worked closely with you. We strive to be transparent about our reference-checking process and handle all personal data in accordance with applicable data protection regulations. Any additional references will be sought with professional judgment and only when considered relevant to the role. We offer competitive compensation aligned with our internal salary framework and growth potential in the role. We do not accept applications via email.  We are not open to external help from recruitment agencies.  Note on AI Use: Blykalla may use AI technology to assist with certain administrative aspects of the hiring process, such as note-taking, interview documentation, and reporting. However, every resume and application is reviewed directly by our recruiting team. AI tools are used solely for operational support and do not influence candidate evaluation or hiring decisions.