THE U.S. NUCLEAR REGULATORY COMMISSION (NRC) is issuing this Sources Sought Synopsis as a means of conducting market research or as a market survey to determine the availability of potential qualified vendors with the technical capability to provide all management, supervision, administration, and labor for the project titled “Symbolic Nuclear Analysis Package (SNAP) Development, Maintenance, and Support.” Services are to be provided to the NRC in Rockville, Maryland. The applicable North American Industry Classification System (NAICS) code assigned to this procurement is 541511 (Custom Computer Programming Services) . THERE IS NO SOLICITATION AT THIS TIME. This request for sources and vendor information does not constitute a request for proposal; submission of any information in response to this market survey is purely voluntary; the Government assumes no financial responsibility for any costs incurred . Background and Objective The U.S. Nuclear Regulatory Commission (NRC), Office of Nuclear Regulatory Research (RES), requires continued development, maintenance, sustainment, and user support for its suite of plugins and plotting tools within the Symbolic Nuclear Analysis Package (SNAP) framework. SNAP is a graphical user interface developed and owned by ISL, Inc. that is licensed to the NRC. The NRC has funded and owns specific plugins within the SNAP framework — including the TRACE, PARCS, MELCOR, MACCS, and FAST plugins — which assist NRC staff and international partners in developing input models and analyzing output for complex nuclear safety codes. The objective of this follow-on contract is to ensure seamless operation of these NRC-owned plugins, adapt to ongoing updates in the underlying physics codes, provide sustained support for mature plugins, and continue development of GRAVE Plot — an NRC-owned scientific data visualization tool (successor to APTplot) used in conjunction with SNAP workflows. Scope of Work Summary The anticipated scope includes: Core Plugin Maintenance: Routine and patch-driven updates to the TRACE, PARCS, MELCOR, MACCS, and FAST plugins to align with external code releases, ensuring backward compatibility and regression testing. Sustainment and User Support: Long-term maintenance of mature plugins (e.g., Engineering Template, SLURM Job Stream, Git Version Control, Uncertainty Quantification) and production of Section 508-compliant technical tutorial videos. Visualization Tool Development: Active continuous development of GRAVE Plot, including User Interface (UI) refinements, new plot format support, and Python API integration. Required Capabilities Technical experience and proficiency developing complex Java-based plugins designed to integrate with the SNAP core architecture. Demonstrated knowledge of NRC's safety analysis codes, specifically TRACE, PARCS, MELCOR, MACCS, and FAST. Experience developing scientific data visualization tools. Specifically, capability to build robust UI interfaces and design/implement a …