Senior Nuclear I&C Engineer - Hardware

About Valar Atomics At Valar Atomics, we're redefining what's possible in energy. Our mission is to make clean, high-temperature nuclear power scalable-unlocking abundant energy for industry, hydrogen, and next-generation manufacturing. We are a team of builders, engineers, and operators who believe nuclear energy should be fast to deploy, factory-made, and built for the real world. Our first pilot plant in Orangeville, Utah will demonstrate how advanced nuclear systems and fuel fabrication can power the future. Joining Valar Atomics means becoming part of a company where autonomy, ownership, and impact exist at every level. The Team You will be joining Valar Atomics' Instrumentation, Control & Electrical (IC&E) organization, working on the Reactor side of the program. Nuclear I&C Hardware Engineers own the instruments that measure the reactor itself neutron flux across startup, intermediate, and power ranges, core and primary loop temperatures and pressures, and radiation levels throughout the plant along with the signal chains that carry those measurements to the protection and control systems. You will work alongside I&C, electrical, reactor physics, thermal-hydraulics, and nuclear safety engineers in a hands-on environment where measurement quality directly supports reactor safety. The team values technical depth, disciplined documentation, and a safety-first culture. The Role Valar Atomics is seeking Senior Nuclear I&C Hardware Engineers to own the plant design and application of nuclear instrumentation for our high temperature gas-cooled reactor program. The role covers neutron flux detection, radiation monitoring, reactor protection system sensors and signal chains, and process instrumentation in nuclear service, applied through instrument selection and specification, signal chain and installation design, cabling and grounding, environmental and radiation qualification, and commissioning. The focus is application of vendor-supplied instrumentation in plant design, not instrument or detector development. This is a senior position: you will own nuclear instrumentation scope end-to-end, from instrument selection and signal chain design through installation design, qualification, and commissioning, and provide technical direction to vendors, contractors, and junior engineers. Key Responsibilities Select, specify, and analyze neutron flux detection hardware including fission chambers, ion chambers, and proportional counters across source, intermediate, and power range instrumentation, including range overlap, sensitivity, and cable and environment constraints. Design and analyze nuclear instrumentation signal chains end-to-end: detector biasing, preamplifier selection and placement, pulse, fluctuation (Campbell/MSV), and current mode processing, cable selection and length effects, termination, and noise and grounding practice. Apply detector physics neutron interactions, detector response, gamma discrimination, activation, and radiation transport - to instrument selection, placement, and shielding decisions, in coordination with reactor physics and shielding analysts. Select and specify radiation monitoring instrumentation including area monitors, process and effluent monitors, and health physics instrumentation, including range, response, and regulatory basis. Specify process instrumentation in nuclear service temperature, pressure, flow, and level for the primary helium loop and supporting systems - including environmental compatibility, materials, and qualification implications of high-temperature helium service. Produce and own instrumentation engineering documentation including instrument data sheets, specifications, loop diagrams, I/O lists, block diagrams, and installation details. Develop instrument installation and physical integration design instrument locations, thermowells and penetrations, junction boxes, cable and MI cable routing, and physical separation in coordination with electrical designers and mechanical and piping engineers. Lead environmental and radiation qualification for assigned equipment: qualification plans, application service condition definition, review and acceptance of vendor qualification test reports and analyses, thermal and radiation aging analysis, and qualification documentation consistent with IEEE 323 and IEEE 344 methodologies. Execute reactor protection system hardware scope including sensor selection, redundancy and voting architecture input, channel independence and separation considerations, setpoint analysis input, and response time analysis and testing. Plan and lead integration and verification test programs including channel bring-up and integration, receipt verification, cable and connector testing, and data acquisition; own test procedures, data quality, and test reports. Lead factory and site acceptance testing, calibration, loop checking, and commissioning of nuclear instrumentation. Diagnose and resolve instrumentation problems incl #J-18808-Ljbffr