TEXAS NUCLEAR POWER PLANT OPERATOR
LICENSING EXAM QUESTIONS AND CORRECT
ANSWERS (VERIFIED ANSWERS) PLUS
RATIONALES 2025/2026 Q&A | INSTANT
DOWNLOAD PDF
1. Which of the following is the primary function of the reactor coolant system
(RCS)?
A. Generate electricity
B. Transfer heat from the fuel to the steam generator
C. Maintain containment integrity
D. Moderate neutron flux
• Answer: B
• Rationale: The RCS transfers heat from the reactor core (fuel rods) to the
steam generator where steam is produced for turbine operation. Its
function is heat transport, not electricity generation or neutron moderation.
2. What is the primary purpose of the pressurizer in a pressurized water reactor
(PWR)?
A. Increase coolant flow rate
B. Maintain coolant temperature
C. Control system pressure
D. Remove excess steam
• Answer: C
• Rationale: The pressurizer maintains reactor coolant system pressure by
heating or spraying coolant to prevent boiling within the RCS.
3. Which radiation type poses the greatest external exposure hazard to workers
in a nuclear plant?
A. Alpha particles
,B. Beta particles
C. Gamma rays
D. Neutrons
• Answer: C
• Rationale: Gamma radiation has high penetration power and presents the
most significant external hazard compared to alpha and beta radiation.
Neutrons are also hazardous but are more easily shielded by materials like
water.
4. During a reactor trip, control rods are inserted into the core to…
A. Increase neutron moderation
B. Absorb neutrons and shut down the chain reaction
C. Reduce coolant flow
D. Cool the turbine
• Answer: B
• Rationale: Control rods contain neutron-absorbing materials (e.g., boron or
cadmium) and terminate the chain reaction by absorbing free neutrons.
5. Which system provides emergency cooling to the reactor core in the event of
a large break LOCA?
A. Containment Spray System
B. Emergency Core Cooling System (ECCS)
C. Turbine Bypass System
D. Feedwater System
• Answer: B
• Rationale: The ECCS ensures core cooling during loss-of-coolant accidents,
preventing core damage.
6. The heat removed by the condenser in a nuclear plant is rejected to:
A. The atmosphere via cooling towers or water bodies
B. The reactor vessel
C. The containment building
D. The pressurizer
, • Answer: A
• Rationale: Condensers reject turbine exhaust heat to the environment,
typically through cooling towers or a nearby river/lake.
7. A high radiation area is defined as any area where a person could receive:
A. 1 mrem/hr at 30 cm
B. 100 mrem/hr at 30 cm
C. 500 mrem/hr at 30 cm
D. 1,000 mrem/hr at 30 cm
• Answer: B
• Rationale: NRC regulations (10 CFR 20) define a high radiation area as one
where an individual could receive more than 100 mrem/hr at 30 cm from
the source.
8. Which of the following describes the purpose of the containment building?
A. Generate additional power
B. Serve as secondary neutron moderator
C. Prevent release of radioactive materials to the environment
D. Maintain turbine pressure
• Answer: C
• Rationale: Containment is the last barrier to prevent the release of
radioactive material to the environment.
9. Boron is used in the reactor coolant of a PWR primarily to:
A. Cool the fuel rods
B. Absorb neutrons for reactivity control
C. Increase moderator effectiveness
D. Protect against corrosion
• Answer: B
• Rationale: Boron is a soluble neutron absorber that helps control reactivity
throughout the fuel cycle.
10. Which of the following alarms would require the operator to immediately
check for potential fuel damage?
LICENSING EXAM QUESTIONS AND CORRECT
ANSWERS (VERIFIED ANSWERS) PLUS
RATIONALES 2025/2026 Q&A | INSTANT
DOWNLOAD PDF
1. Which of the following is the primary function of the reactor coolant system
(RCS)?
A. Generate electricity
B. Transfer heat from the fuel to the steam generator
C. Maintain containment integrity
D. Moderate neutron flux
• Answer: B
• Rationale: The RCS transfers heat from the reactor core (fuel rods) to the
steam generator where steam is produced for turbine operation. Its
function is heat transport, not electricity generation or neutron moderation.
2. What is the primary purpose of the pressurizer in a pressurized water reactor
(PWR)?
A. Increase coolant flow rate
B. Maintain coolant temperature
C. Control system pressure
D. Remove excess steam
• Answer: C
• Rationale: The pressurizer maintains reactor coolant system pressure by
heating or spraying coolant to prevent boiling within the RCS.
3. Which radiation type poses the greatest external exposure hazard to workers
in a nuclear plant?
A. Alpha particles
,B. Beta particles
C. Gamma rays
D. Neutrons
• Answer: C
• Rationale: Gamma radiation has high penetration power and presents the
most significant external hazard compared to alpha and beta radiation.
Neutrons are also hazardous but are more easily shielded by materials like
water.
4. During a reactor trip, control rods are inserted into the core to…
A. Increase neutron moderation
B. Absorb neutrons and shut down the chain reaction
C. Reduce coolant flow
D. Cool the turbine
• Answer: B
• Rationale: Control rods contain neutron-absorbing materials (e.g., boron or
cadmium) and terminate the chain reaction by absorbing free neutrons.
5. Which system provides emergency cooling to the reactor core in the event of
a large break LOCA?
A. Containment Spray System
B. Emergency Core Cooling System (ECCS)
C. Turbine Bypass System
D. Feedwater System
• Answer: B
• Rationale: The ECCS ensures core cooling during loss-of-coolant accidents,
preventing core damage.
6. The heat removed by the condenser in a nuclear plant is rejected to:
A. The atmosphere via cooling towers or water bodies
B. The reactor vessel
C. The containment building
D. The pressurizer
, • Answer: A
• Rationale: Condensers reject turbine exhaust heat to the environment,
typically through cooling towers or a nearby river/lake.
7. A high radiation area is defined as any area where a person could receive:
A. 1 mrem/hr at 30 cm
B. 100 mrem/hr at 30 cm
C. 500 mrem/hr at 30 cm
D. 1,000 mrem/hr at 30 cm
• Answer: B
• Rationale: NRC regulations (10 CFR 20) define a high radiation area as one
where an individual could receive more than 100 mrem/hr at 30 cm from
the source.
8. Which of the following describes the purpose of the containment building?
A. Generate additional power
B. Serve as secondary neutron moderator
C. Prevent release of radioactive materials to the environment
D. Maintain turbine pressure
• Answer: C
• Rationale: Containment is the last barrier to prevent the release of
radioactive material to the environment.
9. Boron is used in the reactor coolant of a PWR primarily to:
A. Cool the fuel rods
B. Absorb neutrons for reactivity control
C. Increase moderator effectiveness
D. Protect against corrosion
• Answer: B
• Rationale: Boron is a soluble neutron absorber that helps control reactivity
throughout the fuel cycle.
10. Which of the following alarms would require the operator to immediately
check for potential fuel damage?
