Senior Nuclear Core Design Engineer

            The Senior Nuclear Core Design Engineer supports the design, analysis, and licensing of the SMR‑300, an integral pressurized water reactor small modular reactor. This role plays a critical part in core physics analysis, fuel management evaluations, and preparation of nuclear licensing documentation in support of ongoing SMR‑300 development. The Senior Nuclear Core Design Engineer will join an established and growing core design and nuclear analysis team and is expected to independently execute complex technical analyses, benchmark methods and models, clearly document results, and mentor junior engineers in analysis techniques and technical documentation. The ideal candidate brings deep reactor physics expertise, strong analytical and technical writing skills, and experience supporting NRC licensing activities.

Location: Flexible — role may be based in Camden, NJ; Jupiter, FL; Cranberry, PA; Madrid, Spain; Bristol, UK; or Kyiv, Ukraine

Primary Responsibilities:

Perform reactor core design and reload analyses supporting steady‑state operation, transient evaluations, and safety analyses Develop, validate, and maintain core physics models, including lattice and nodal calculations Generate physics parameters and cross‑section data for use in safety and system analyses Conduct benchmarking and code qualification activities against experimental data and industry standards Support fuel cycle optimization, reactivity control strategies, and long‑term core performance evaluations Prepare detailed technical analyses and reports for internal use and external regulatory submittals Contribute to licensing documentation, including PSAR, FSAR, and responses to NRC Requests for Additional Information (RAIs) Participate in technical discussions with cross‑functional internal teams, external partners, clients, and the U.S. Nuclear Regulatory Commission Mentor and provide technical guidance to junior engineers on analysis methodologies and documentation standards Support continuous improvement of core design tools, processes, and technical documentation practices