The official NRC Reactor Operator License Exam is certified and administered by the U.S. Nuclear Regulatory Commission (NRC) for individuals seeking professional licensure. It evaluates candidates across various domains, covering fundamental reactor theory, core design features, primary and secondary coolant systems, reactivity controls, safety equipment, emergency systems, containment, operating procedures, and advanced thermodynamics across 75 questions.
Individuals seeking licensure as reactor operators at power reactor facilities. Candidates must fulfill eligibility requirements, training criteria, and qualifications established by the U.S. Nuclear Regulatory Commission (NRC).
Review all relevant criteria very carefully before test day to ensure complete preparation. Study reactor theory, primary and secondary systems, facility operating characteristics, and emergency procedures. Practice sample questions covering all distinct domains, examine written examination outlines containing 75 questions, and utilize simulator scenarios to prepare completely for operating tests.
This specific domain covers the fundamental principles of reactor theory, including the fission process, neutron multiplication mechanisms, source effects, control rod effects, criticality indications, various reactivity coefficients, and important poison effects.
This examination domain evaluates the general design features of the reactor core, including core structure, fuel elements, control rods, core instrumentation, and the overall dynamics of coolant flow throughout the assembly.
Candidates within this area must demonstrate deep knowledge regarding the mechanical components and intricate design features of the reactor primary system, ensuring safe containment and operational integrity under various plant conditions.
This domain investigates the secondary coolant loops and various auxiliary systems that directly affect overall facility performance, heat rejection capabilities, and integrated power generation stability during routine commercial plant operations.
This section explores facility operating characteristics during steady state and transient conditions, including coolant chemistry management, causes and effects of temperature, pressure and reactivity changes, load changes, and operating limitations.
This domain reviews the design specifications, physical components, and operational functions of diverse reactivity control mechanisms and their associated monitoring instrumentation used to regulate core power levels safely.
Candidates explore the design, components, and functions of control and safety systems, including instrumentation, signals, interlocks, failure modes, and automatic and manual features designed to protect plant equipment and personnel.
This domain details the specific hardware components, operational capacity limits, and vital functions of emergency systems designated to mitigate accident conditions and maintain core cooling under abnormal plant operating scenarios.
This subject area addresses biological shielding, system isolation, and containment design features, including strict physical access limitations established to protect workers and the general public from potential radiation hazards.
Candidates must learn administrative protocols along with normal, abnormal, and emergency operating procedures for the facility to ensure safe responses during both routine power operations and unexpected transient plant events.
This domain covers the primary purpose and routine operation of radiation monitoring systems, including audible alarms, fixed detectors, and portable survey equipment utilized for environmental and personnel protection.
This section focuses heavily on fundamental radiological safety principles and regulatory procedures designed to minimize occupational radiation exposure and maintain plant safety standards in accordance with federal guidelines.
Candidates examine established procedures and equipment available for the safe handling, temporary storage, and compliant disposal of radioactive materials and liquid or gaseous effluents generated during plant operations.
This final technical domain reviews the core principles of heat transfer, classical thermodynamics, and fluid mechanics as they apply directly to reactor coolant system thermal performance and energy conversion processes.
Arrive prepared for the written examination consisting of 75 questions and the operating test. Follow all instructions provided by the U.S. Nuclear Regulatory Commission (NRC) chief examiner.
The written examination consists of 75 questions. Candidates must also complete an operating test administered by the U.S. Nuclear Regulatory Commission (NRC) or facility licensees as part of the licensing process.
Candidates must achieve 80% or better on the written examination and successfully pass the operating test as administered under official U.S. Nuclear Regulatory Commission (NRC) guidelines and professional evaluation standards.
Exam duration details depend entirely upon scheduling arrangements established by the U.S. Nuclear Regulatory Commission (NRC) and facility licensees, covering both the written examination and operating tests.
The exam is administered in accordance with standards established by the U.S. Nuclear Regulatory Commission (NRC) for all individuals seeking professional licensure at commercial power reactor facilities.
Verified 2026-09-14
This informational page was compiled using official documentation and guidance from the U.S. Nuclear Regulatory Commission regarding operator licensing exams and regulatory requirements.