--- title: 'Senior NSSS Integration Engineer at Alva Energy, Inc' canonical: 'https://feeny.ai/job/senior-nsss-integration-engineer-alva-energy-inc-cambridge-2kv5epqsns76' type: 'job' last_seen: '2026-09-05' --- # Senior NSSS Integration Engineer at Alva Energy, Inc - **Company:** Alva Energy, Inc - **Location:** Cambridge, MA - **Employment:** full-time - **Work type:** hybrid - **Posted:** 2026-06-26 - **Last confirmed live:** 2026-09-05 - **Apply:** https://jobs.ashbyhq.com/alva-energy/c4c48cc7-0a2c-4286-b73b-55cfda2c501d/application **Skills:** Nuclear power plant operations, Systems engineering, Design engineering, Plant modification programs, 4-loop PWR operation, NSSS integration, Balance-of-plant interfaces, Safety analysis, Mechanical design, Project coordination, Startup test planning, Transient analysis, Control system integration > Lead the integration of nuclear steam supply system requirements into uprate execution programs, focusing on 2TGP integration and plant modifications. Bridge plant operations, systems engineering, and safety analysis to ensure technically sound and operationally practical system integration aligned with plant safety... ## Job description Alva Energy is scaling nuclear power uprates and related first-of-a-kind deployment projects across the U.S. power fleet. We are hiring a Senior NSSS Integration Engineer to lead integration of nuclear steam supply system requirements into Alva’s uprate execution programs, with particular focus on 2TGP integration, plant modifications, and coordination across internal and external engineering teams. This role is a senior technical leadership position for an engineer who can bridge plant operations, systems engineering, transient response, and implementation planning. You will work closely with Alva’s process engineering team, I&C engineering, safety analysis team, EPC partner, utility partner, and NSSS vendor to ensure uprate-related system integration is technically sound, operationally practical, and aligned with plant safety and design basis requirements. Key Responsibilities: - Lead NSSS integration for Alva’s 2TGP and related uprate projects, ensuring NSSS requirements are correctly translated into system design, controls philosophy, and implementation scope. - Work with Alva’s 2TGP process engineering team, EPC partner, I&C manager, and DuoSync developer to define and manage the NSSS-side requirements needed for integrated plant operation. - Develop and define operating strategies and procedures for startup, shutdown, step load changes, ramping, and other transient operating conditions relevant to two turbine plant operation. - Serve as the technical bridge between plant operations, process design, controls development, and engineering implementation for NSSS-related system integration. - Partner with Alva’s safety analysis team to review safety analysis outputs and determine required plant modifications, design updates, and engineering actions. - Support engineering definition and review of NSSS-related plant modifications, including containment, ECCS, auxiliary feedwater, and other systems. - Coordinate technical interfaces among the utility partner, EPC partner, internal engineering team, and NSSS vendor to resolve design, operational, and licensing-basis issues. - Review design packages, technical deliverables, and modification concepts to ensure consistency with plant operating requirements, transient performance expectations, and NSSS design constraints. ## Qualifications - Bachelor’s degree in Mechanical Engineering, Nuclear Engineering, or related engineering discipline. - 10+ years of experience in nuclear power plant operations, systems engineering, design engineering, or plant modification programs. - Strong background in 4-loop PWR operation and systems engineering, ideally with direct experience supporting plant transients, operating procedures, and system response. - Demonstrated experience working across NSSS and balance-of-plant interfaces in an operating plant or major plant modification environment. - Familiarity with safety analysis and the engineering implications of design-basis and transient performance requirements. - Ability to work effectively across process engineering, I&C, safety analysis, EPC, utility, and vendor organizations. - Breadth of experience in mechanical design, project coordination, and cross-functional technical leadership. - Strong written and verbal communication skills, including the ability to lead technical discussions and drive alignment across diverse stakeholders. - Willingness to travel periodically to utility, partner, and supplier sites as needed. ## Preferred Qualifications - Prior licensed operator, SRO, or equivalent plant operations background at a 4-loop PWR. - Experience supporting uprates, major plant modifications, or first-of-a-kind integration efforts. - Familiarity with startup test planning, transient analysis inputs, or control system integration in nuclear plant environments. ## About Alva Energy, Inc ## Core Business - **Primary industry**: Nuclear power generation / energy infrastructure - **Target customers**: Utilities operating existing U.S. nuclear reactors; power purchasers and project investors seeking long-term PPAs - **Mission**: Deliver gigawatts of new nuclear power at the speed and cost of gas by converting one-off engineering efforts into repeatable, financeable infrastructure projects ## Products & Services - **Alva Uprate** – A turnkey, drop‑in capacity upgrade for existing nuclear reactors. Each project delivers 250–300 MWe of additional power using: - **Advanced Steam Generators** – Replacement units that increase heat‑transfer surface area and improve coolant flow to enable higher reactor thermal power while maintaining safety margins. - **Second Turbine Plant (2TGP)** – A new turbine built outside the protected area to handle excess steam, allowing the existing turbine to operate within proven limits. - **DUO‑SYNC Control System** – A dual‑redundant digital control system that integrates the reactor, existing turbine, and 2TGP into a single coordinated unit. - **Delivery Model**: Firm‑fixed‑price, <2 years from procurement, ~$1 billion per uprate. Off‑balance‑sheet financing available for utilities. ## Market Standing - **Valuation / Market Cap**: Not publicly disclosed - **Key Metric**: Total funding – $33M (Series A, raised ~March 2026) - **Notable Investors**: Segra Capital, Mercator Partners, 8VC, Isabelle Boemeke, Michael Andersen, and 11 other investors - **Growth Signals**: - Target of 10 GWe added to the U.S. nuclear fleet (80 TWh/yr) - Backed by industry veterans with world records in high‑speed nuclear construction and licensing - Technology already NRC‑licensed and supported by >100 reactor‑years of safe operation (from Ringhals Unit 4 uprate precedent) ## Competitive Advantages - **Proven, regulator‑ready technology** – Avoids first‑of‑a‑kind risk by building on uprates already licensed by the NRC and demonstrated in Sweden. - **Repeatable, financeable model** – Standardized scope and delivery turn uprates into infrastructure projects that can be financed off‑balance‑sheet, reducing utility regulatory delay. - **Speed and cost certainty** – <2 year deployment and firm‑fixed‑price contracts contrast sharply with traditional multi‑year, over‑budget nuclear construction. - **Experienced leadership** – Team includes former Intel CEO Pat Gelsinger and other executives who have delivered tens of billions in deployed capital across nuclear, industrial, and semiconductor projects. ## Strategic Focus - Scale the Alva Uprate across the U.S. nuclear fleet to unlock 10 GWe of clean baseload power. - Build repeatable project delivery infrastructure (procurement, engineering, licensing) to reduce cost and risk with each subsequent deployment. - Partner with utilities to offer off‑balance‑sheet financing and high‑value PPAs, removing regulatory hurdles. ## Why Work Here - **Culture**: “Startup speed” combined with nuclear industry veterans. Emphasis on moving fast because the technology is proven, safe, and reliable. - **Engineering focus**: Roles span reactor engineering, steam turbine plants, digital controls, licensing, and DevOps – all working on real, grid‑scale projects. - **Mission‑driven**: Directly contribute to adding gigawatts of clean, always‑on power in years, not decades. - **Work environment**: Office likely based in Cambridge, MA (headquarters). Remote/hybrid policy not specified; company is in growth phase with multiple open engineering positions. - **Notable perks**: Opportunity to work with leaders who hold world records in nuclear construction; chance to innovate new methods for nuclear deployment (“design once, deploy many”). ## Sources 1. [alvaenergy.io](https://alvaenergy.io/) – Company overview, product details, metrics 2. [alvaenergy.io/careers](https://alvaenergy.io/careers/) – Open positions and culture messaging 3. [alvaenergy.io/about](https://alvaenergy.io/about/) – Leadership, board, team, investors 4. [cbinsights.com](https://www.cbinsights.com/company/alva-energy) – Funding data, headquarters, founded year ## Other roles at Alva Energy, Inc - [I&C Engineer](https://feeny.ai/job/i-c-engineer-alva-energy-inc-cambridge-cvwchnzmwaxr) — Cambridge, MA - [Engineering Director](https://feeny.ai/job/engineering-director-alva-energy-inc-cambridge-dxq6f7zmqm6w) — Cambridge, MA - [SVP, Nuclear New Build Program](https://feeny.ai/job/svp-nuclear-new-build-program-alva-energy-inc-cambridge-1k8w64nebzr8) — Cambridge, MA - [Engineering Director, Steam Turbine Plant](https://feeny.ai/job/engineering-director-steam-turbine-plant-alva-energy-inc-cambridge-gjtkb7cg3670) — Cambridge, MA - [Senior Procurement Engineer, Power Generation](https://feeny.ai/job/senior-procurement-engineer-power-generation-alva-energy-inc-cambridge-57605vybg7b8) — Cambridge, MA - [Senior Project Engineer, Steam Turbine Plant](https://feeny.ai/job/senior-project-engineer-steam-turbine-plant-alva-energy-inc-cambridge-pzegb5h4mymj) — Cambridge, MA