EPRI Core Protection Nantel – Questions And Answers
What is the primary safety concern for nuclear power plant operations?
✔️Ans -Preventing significant radiation exposure to the public during routine
and accident conditions.
How is the primary safety concern for nuclear power plant operations
achieved? ✔️Ans -Employing fission product barriers and
engineered safety features.
Identify ways a core can fail ✔️Ans -Any loss of core geometry,
particularly into a configuration where cooling becomes impractical, is
considered a core failure
List three ways that the core has an inability to fully remove the heat created
by the fuel ✔️Ans -1. A failure of the heat removal systems
2. An increase of heat created beyond the ability of the heat removal systems
3. The inability to transfer heat from the fuel
What are the three fission product barriers? ✔️Ans -1. fuel pellet
and cladding
2. Reactor Coolant System (RCS) pressure boundary
3. Containment
Prevents the escape of fission products from cladding ✔️Ans -Fuel
pellet and cladding (first fission product barrier)
Contains the radionuclides that escaped the cladding or were produced
outside the cladding ✔️Ans -RCS pressure boundary (second
fission product barrier)
Holds radionuclides that have escaped from the RCS ✔️Ans -
Containment (third fission product barrier)
The defense-in-depth policy states that a utility should: ✔️Ans -1.
Design to prevent the occurrence of nuclear accidents
2. Assume that accidents will occur
3. Provide proven capability to meet the range of worst-case accidents
, Defined as hypothesized events that affect one or more of the radioactive
material barriers and that are not expected during plant operations
✔️Ans -Accidents
What are two accident types that are considered? ✔️Ans -1.
Mechanical failure of a single component leading to the release of radioactive
material from one or more barriers
2. Arbitrary rupture of any single pipe up to and including complete severance
of the largest pipe in the nuclear system process barrier
By definition, what is typically a worst-case accident of interest
✔️Ans -Design Basis Accident (DBA)
When designing a plant, the philosophy documented in the FSAR contains
several layers. Which of the following assumptions are used to ensure core
protection? ✔️Ans -a. The plant is operating in a given band via
proper control
b. The plant is assumed to be in steady state prior to the transient
c. The plant is being operated within Technical Specifications
A design basis accident is typically a worst-case accident of interest.... T/F
✔️Ans -True
- It is the specification to which a plant is designed
Primary safety concern for nuclear power plant operation is....
✔️Ans -the protection of the public from the release of fission products
First line of defense is.... ✔️Ans -keeping the core covered, cooled,
and properly reactive
The systems of the plant are designed with several layers of protection
including.... ✔️Ans -automatic controls, alarms, and automatic
protective systems.
The focus of accident mitigation is.... ✔️Ans -protecting the reactor
core
What is the primary safety concern for nuclear power plant operations?
✔️Ans -Preventing significant radiation exposure to the public during routine
and accident conditions.
How is the primary safety concern for nuclear power plant operations
achieved? ✔️Ans -Employing fission product barriers and
engineered safety features.
Identify ways a core can fail ✔️Ans -Any loss of core geometry,
particularly into a configuration where cooling becomes impractical, is
considered a core failure
List three ways that the core has an inability to fully remove the heat created
by the fuel ✔️Ans -1. A failure of the heat removal systems
2. An increase of heat created beyond the ability of the heat removal systems
3. The inability to transfer heat from the fuel
What are the three fission product barriers? ✔️Ans -1. fuel pellet
and cladding
2. Reactor Coolant System (RCS) pressure boundary
3. Containment
Prevents the escape of fission products from cladding ✔️Ans -Fuel
pellet and cladding (first fission product barrier)
Contains the radionuclides that escaped the cladding or were produced
outside the cladding ✔️Ans -RCS pressure boundary (second
fission product barrier)
Holds radionuclides that have escaped from the RCS ✔️Ans -
Containment (third fission product barrier)
The defense-in-depth policy states that a utility should: ✔️Ans -1.
Design to prevent the occurrence of nuclear accidents
2. Assume that accidents will occur
3. Provide proven capability to meet the range of worst-case accidents
, Defined as hypothesized events that affect one or more of the radioactive
material barriers and that are not expected during plant operations
✔️Ans -Accidents
What are two accident types that are considered? ✔️Ans -1.
Mechanical failure of a single component leading to the release of radioactive
material from one or more barriers
2. Arbitrary rupture of any single pipe up to and including complete severance
of the largest pipe in the nuclear system process barrier
By definition, what is typically a worst-case accident of interest
✔️Ans -Design Basis Accident (DBA)
When designing a plant, the philosophy documented in the FSAR contains
several layers. Which of the following assumptions are used to ensure core
protection? ✔️Ans -a. The plant is operating in a given band via
proper control
b. The plant is assumed to be in steady state prior to the transient
c. The plant is being operated within Technical Specifications
A design basis accident is typically a worst-case accident of interest.... T/F
✔️Ans -True
- It is the specification to which a plant is designed
Primary safety concern for nuclear power plant operation is....
✔️Ans -the protection of the public from the release of fission products
First line of defense is.... ✔️Ans -keeping the core covered, cooled,
and properly reactive
The systems of the plant are designed with several layers of protection
including.... ✔️Ans -automatic controls, alarms, and automatic
protective systems.
The focus of accident mitigation is.... ✔️Ans -protecting the reactor
core
