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Neutronics Engineer Jobs

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Today

Nuclear Engineer - Core Design

Westinghouse Electric Company Cranberry Township, PA

Cranberry Township, PA

Today

$58k - $73k/yr Full time Design Design Engineering Engineering

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Job Description

Hybrid flexibility in Cranberry Township, PA, with opportunities to build expertise through comprehensive career programs and educational reimbursement. Westinghouse Electric Company offers comprehensive medical coverage options that may include medical, dental, vision, and prescription coverage, along with Health Savings Account (HSA) options with employer contributions. You will also have access to wellness programs, an Employee Assistance Program for you and your household members, 401(k) with company match, paid vacations and company holidays, and referral incentives.

What You’ll Do

In this Core Design Engineer role, you will improve the arrangement and performance of fuel assemblies within a nuclear reactor core. Your work supports safe operation, regulatory compliance, and power output goals by using complex core calculations and partnering with multiple engineering teams.

Develop core physics models (lattice and nodal) for steady-state operation and transient evaluations.
Perform core reload calculations and design fuel loading patterns for operational cycles.
Support the preparation of licensing documents for the U.S. Nuclear Regulatory Commission (NRC) and conduct benchmarking against industry standards.
Generate calculations to support startup of a new reactor cycle.
Interface with thermal-hydraulics, fuel rod design, safety analysis, and licensing teams to meet operational goals.

What You Bring

Bachelor’s Degree in Mechanical or Nuclear Engineering.
0+ years experience.
Previous Westinghouse internship helpful.

Benefits and Career Support

Comprehensive Medical benefits, which could include medical, dental, vision, prescription coverage, and Health Savings Account (HSA) with employer contributions options
Wellness Programs, including an Employee Assistance Program for support for employees and household members
401(k) with Company Match Contributions
Paid Vacations and Company Holidays
Flexible Work Arrangements to promote work-life balance
Educational Reimbursement and Comprehensive Career Programs to help employees grow
Global Recognition and Service Programs to celebrate accomplishments and service
Employee Referral Program

Role location: Cranberry Township, PA (mobile/hybrid). You will report to the Manager Nuclear Design.

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6mo ago

Nuclear Engineer III/IV (Reactor Design)

Fissionaire Madison, WI

Madison, WI

6mo ago Closed

$125k - $180k/yr Full time Senior Design Engineering

This position is no longer accepting applications (closed May 19, 2026).

Job Description

Fissionaire is hiring a Nuclear Engineer III/IV to spearhead the design, analysis, and optimization of next-generation reactor systems in Madison, Wisconsin, onsite, with a salary range of USD 125,000 to 180,000 per year.

Responsibilities

Oversee core and system-level design activities, spanning thermal-hydraulic, neutronic, and mechanical disciplines.
Conduct analysis, modeling, and optimization using established nuclear design software.
Coordinate fuel, coolant, and structural components to form integrated designs that satisfy safety, performance, and cost objectives.
Work with mechanical, materials, and safety engineers to ensure coherent designs and readiness for regulatory review.
Carry out risk assessments and safety analyses to verify compliance with rigorous nuclear safety standards.
Produce technical reports, design documents, and presentations for internal teams and regulators.
Perform trade studies and sensitivity analyses to inform design choices.
Engage in design reviews, safety analyses, and interactions with regulatory bodies.
Maintain up-to-date knowledge of emerging reactor technologies, materials research, and simulation methods.
Contribute to project planning, budgeting, and scheduling to ensure timely milestone delivery.
Support a culture of innovation, accountability, and technical excellence.

About Fissionaire

Fissionaire is advancing the next generation of nuclear technology to deliver safe, scalable, and sustainable energy. The team is small, fast-moving, and mission-driven, combining deep technical expertise with a startup mindset. As we grow, we’re designing systems that aim to redefine the role of nuclear power in the world.

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Neutronics Engineer Jobs

Nuclear Engineer - Core Design

Nuclear Engineer III/IV (Reactor Design)

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