Reactor Operator Practice Exam

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• Xenon-135 is produced in a reactor primarily by which mechanisms?
• The safety limit violation report must describe the effect of the violation on what?
• If the void coefficient is negative, what does it indicate about the reactor core?
• Channel check is defined as?
• Which of the following is not a radioactive decay process?
• Limiting Conditions for Operation describe the lowest functioning capability or performance levels of equipment required for safe operation.
• What is mass defect?
• Administrative Controls encompass provisions related to ...
• Which statement best describes a proportional counter?
• The fuel plates within the core are cladded with which material?
• Fission chambers are mostly used as what?
• Surveillance Requirements define requirements relating to tests, calibration, or inspection to ensure...
• Which decay process emits gamma radiation without changing the atomic number or mass number?
• Which statement about radiosensitivity is true?
• In the safety limit violation report, which element describes causes and contributing factors?
• What is the maximum permissible annual dose for the whole body, head, trunk, arm above elbow, and leg above knee?
• Which statement best describes a System?
• What is binding energy?
• What document shall be prepared following a safety limit violation?
• How many grams of U-235 are there per plate?
• How do you calculate the value of reactivity with keff?
• Which equation expresses the inverse-square law for radiation intensity from a point source?
• Which sequence best describes the order of actions following a safety limit violation?
• Which safety blades have cadmium tips, and which safety blade has about one-third the amount of cadmium?
• What surrounds the fuel boxes and acts as reflector/moderator?
• Gamma detectors have an indefinitely long life since they contain no sensitive materials.
• Which statement describes the biennial surveillance interval?
• The report must address health and safety impact on which groups?
• Which statement describes xenon-135 behavior after reactor shutdown?
• What energy range defines Fast Neutrons?
• In transient equilibrium, which statement is correct?
• What enrichment level of U-235 has the UFTR used since 2006?
• In the UFTR Administrative Structure, Level 3 is responsible for which role?
• Which of the following is NOT a typical neutron moderator?
• In the four-factor formula kinf, what does the factor n represent?
• What conditions constitute the reactor secured state?
• When operating the reactor for a great length of time WITHOUT refueling, there is a loss in reactivity. Why is that?
• MODE 5 is defined by which shielding condition?
• The four-factor formula kinf is defined for what type of reactor?
• What is the residual atom called after the removal of an electron?
• Radiosensitivity tends to be higher in which type of cells?
• The roentgen is the unit of
• What is an effective shield for alpha particles?
• Damaged fuel is identified if which condition occurs?
• Describe the shield tank.
• What is a compensating ion chamber?
• Describe the number of blades in the UFTR control system?
• A reactor with keff less than 1 is subcritical; a reactor with keff greater than 1 is ______.
• Are good moderators also good reflectors?
• Which material is commonly used as a neutron moderator?
• The three factors used to reduce radiation exposures from external sources to acceptable levels are:
• Which of the following is NOT part of the minimum staffing requirements for Modes 1-3?
• What material surrounds the core?
• With a mass defect of 0.020 amu, what is the corresponding binding energy approximately?
• Definition of a channel in reactor instrumentation.
• NRC notification should occur in accordance with what?
• Which statement about prompt neutrons is true?
• Limiting Safety System Settings (LSSS) are set for a variable with a safety limit. Which statement is correct?
• How many fuel boxes does the UFTR facility have?
• What is the most commonly used gamma detector?
• What percentage of its initial U-235 content can a fuel assembly burnup not exceed?
• In a decay equation, which statement correctly distinguishes beta minus decay from electron capture?
• Which statement best describes detector lifespans?
• Energy of x-ray or gamma photons is lost by three principal methods.
• The safety limit violation report must describe applicable circumstances leading to the violation, including which elements?
• Ionization chambers are used to?
• If keff equals 1, the reactor is:
• In the four-factor formula kinf, what does the factor e represent?
• Which term denotes permission, neither a requirement nor a recommendation?
• When did UFTR first go critical?
• In the four-factor formula, which statement correctly describes the fast fission factor e?
• Biological effects of radiation can be categorized by which aspects?
• The dose equivalence is equal to _____.
• What does 'Reactivity Worth of an Experiment' refer to?
• How do the blades turn?
• Core configuration shall include what?
• Which of the following determines exposure to internal radiation?
• What does RTP stand for, and what does it describe?
• Which category includes neutrons with energies greater than 20 MeV?
• Which gamma interaction is associated with high-energy photons and involves pair production?
• Excess reactivity is defined as the amount of reactivity that would exist if all control blades were moved to the maximum reactive condition from keff = 1, without credit for which effects?
• Which statement best describes alpha particles?
• Core alteration in MODE 5 is defined as movement of which components within the core region?
• What is the unit commonly used for activity besides the curie?
• Define keff qualitatively.
• What best defines an unscheduled shutdown of the reactor?
• In the UFTR Administrative Structure, Level 4 corresponds to which role?
• The UFTR is observed to be on a stable period of 100 seconds. Assuming the initial power level is 10 W, 75 seconds later, the operating power level will be approximately:
• Radiation exposure is defined as
• Which vertical port is used for experimentation?
• What is the UFTR effective delayed neutron fraction at Beginning of Life (BOL)?
• MODE 3 corresponds to which reactor condition?
• Minimum Onset of Nuclear Boiling Ratio (DNBR) is?
• What is the Rabbit pneumatic system?
• Which element must be described in the report under the circumstances leading to the violation?
• What is the UFTR effective delayed neutron fraction at End of Life (EOL)?
• A delayed neutron is emitted by what kind of products?
• How does burnup affect the effective delayed neutron fraction?
• Which statement best describes a Component?
• Which formula best defines the effective neutron multiplication factor keff?
• How many fuel plates are there per full bundle?
• Why does the mass defect exist in nuclear physics terms?
• Channel test involves which of the following?
• Which statement about subcritical, critical and supercritical masses is true?
• What does 'reactor operating' refer to in terms of reactor status?
• Chronic dose is best described as
• What conversion factor converts mass defect in amu to binding energy in MeV?
• The designated second person shall be capable of reaching the control room within how many minutes?
• In an ionization chamber, what quantity is measured to quantify radiation?
• What is a reactor cell?
• Which option is NOT a required action when a safety limit is exceeded?
• In the activity equation A = A0 e^{-λ t}, which parameters determine A?
• What does reactor period conceptually mean?
• Xenon buildup shows a quasi-equilibrium behavior after extensive operation. Which statement is true?
• What does burnup refer to in reactor operation?
• How many bundles are in the core?
• Which laws apply to most low-energy nuclear reactions?
• Binding energy from mass defect: If mass defect is 0.03038 amu, what is binding energy in MeV?
• In the thermal utilization factor, what does the ratio represent?
• What is the main function of the magnesium shroud around the blades?
• A prompt neutron is born from which process?
• What is the Center VP used for when the West VP is unavailable?
• How many vertical ports are there and where do they connect?
• What is the West vertical port primarily used for?
• All methods of detection are based on the ability of radiation to ______.
• The fuel plates contain uranium silicide-aluminum as the fuel meat. Which material specifically constitutes the fuel meat?
• What best describes the thermal column?
• The four-factor kinf formula is applicable to which reactor type with respect to leakage?
• The two characteristics of xenon-135 that make it a major reactor poison are:
• Why is Aluminum 6061 used for cladding?
• In the context of dose equivalence, absorbed dose is expressed in which unit?
• What effect does Doppler broadening have on absorption cross sections?
• Calculate the mass defect for He-4 given the following masses: proton 1.0073 amu; neutron 1.0087 amu; electron 0.0005 amu; He-4 mass 4.0026 amu. He-4 has 2 protons, 2 neutrons, and 2 electrons.
• What is the main purpose of a neutron moderator in a reactor?
• What is the public risk level for this reactor?
• Which statement describes the reactor secured criteria?
• Which statement correctly defines cross section?
• Unnatural radionuclides have applications in which fields?
• Which statement correctly defines a Structure?
• How is Xenon-135 produced in a reactor?
• What is lambda in radioactive decay in terms of half-life?
• Which person must be notified as part of the immediate response?
• In the equation keff = kinf × Lf × Lth, what does Lf denote?
• Which action is not part of the required response to a safety limit violation?
• The report must include corrective actions to prevent recurrence.
• What is located below the core?
• Which factor is NOT a determinant of internal radiation exposure?
• In the intensity equation I = I0 e^(-μ x), what is the unit of μ (mu)?
• What is inside the fuel boxes that allows for moderation?
• Resonance peaks in neutron cross sections occur in which energy region?
• Chronic dose refers to
• Which property is most important to minimize neutron losses due to absorption?
• Using A = A0 e^{-λ t}, calculate A given A0=205862 Bq, λ=2.97×10^-6 s^-1, t=409738 s.
• If a safety limit is exceeded, which sequence of actions is required?
• What is the unit of cross section?
• In secular equilibrium, what is true about the decay rates?
• Radionuclides can be both naturally occurring and artificially produced.
• Which statement best describes delayed neutrons?
• MODE 5, reactor outage, is defined by which shielding condition?
• In a mass defect calculation, what is the expression used to compute the mass defect?
• What defines a reactor shutdown condition?
• The report must address health and safety impact on which groups?
• Tech specifications use numbers to define reactivity of experiments and what margins?
• What is the UFTR designed to be?
• The radiation intensity from a point source varies inversely as the square of the distance from the source. Which equation expresses this relation?
• What is the immediate action when a safety limit violation occurs?
• Why does a neutron lose energy when colliding with carbon atoms in the moderator?
• After a safety limit violation, when can reactor operations resume?
• What is the public dose limit, and does the accident analysis meet it?
• Calculate the distance an experimenter must remain from a 3 Ci Ra-226 source at 1 cm to not receive more than 0.1 mCi in a week.
• Design Features are ...
• Which of the following is a function of in-core neutron sensors?
• Absorbed dose is defined as the energy imparted to matter by the ionizing radiation per unit mass of material at the place of interest.
• Which statement best defines operable in reactor status terms?
• What is the process called that slows fast neutrons to thermal energies?
• Radiosensitivity is directly proportional to what and inversely proportional to what?
• In the United States, NRC-licensed reactors must have some kind of negative feedback loop (temperature, pressure, void, etc.).
• What material is the shroud surrounding the blades made of?
• What is the maximum permissible annual dose for the lens of the eye?
• How is a positive ion formed?
• The fraction of neutrons captured after traveling a distance x in a material is given by which expression?
• UFTR is described as what type of reactor?
• What should be included regarding corrective action in the report?
• Channel calibration is defined as what?
• What does the term effective cross section describe?
• Which equation correctly expresses the attenuation of intensity through a material, given I = I0 e^(-μ x)?
• The on-call senior operator must be able to reach the facility within how many minutes?
• What is an electron volt?
• When calculating the energy change of a nuclear reaction using mass difference, what does a negative deltaE indicate?
• At full power, what is the expected maximum temperature?
• Slow or Cold neutrons have energies below which value?
• Which duration represents a weekly surveillance interval?
• Which statement best defines keff?
• Isotopes that can be turned into fissionable isotopes are called what?
• What does keff = 1 signify in reactor physics?