EPRI EF Nuclear Power Plant Materials
Certification Exam Questions and answers
with 100% Complete Solutions | verified
&updated 2024
Strain - ✔✔Whenever a stress (no matter how small) is applied to a metal, a
proportional dimensional change or distortion must take place. Such a
proportional dimensional change (intensity or degree of the distortion) is called
strain and is measured as the total elongation per unit length of material due
to some applied stress.
Strength - ✔✔A measure of the ability of a material to support an applied load.
It is the ability of a material to resist deformation.
Stress - ✔✔-The internal resistance, or counterforce, of a material to the
distorting effects of an external force or load. These counterforces tend to return
the atoms to their normal positions. The total resistance developed is equal to
the external load. This resistance is known as stress.
,-expressed in pounds per square inch.
Toughness - ✔✔A combination of strength and ductility, i.e., the ability or
capacity of material to absorb energy and deform plastically before fracturing.
Toughness describes the way a material reacts under sudden impacts.
Water hammer - ✔✔Water hammer (or, more generally, fluid hammer) is a
pressure surge or wave caused by the kinetic energy of a fluid in motion when it
is forced to stop or change direction suddenly. It depends on the fluid
compressibility where there are sudden changes in pressure. For example, if a
valve is closed suddenly at an end of a pipeline system a water hammer wave
propagates in the pipe. Moving water in a pipe has kinetic energy proportional to
the mass of the water in a given volume times the square of the velocity of the
water.
Why is degradation of materials important? - ✔✔The principle concern with
degradation of materials is nuclear safety. Corrosion that weakens the walls of
, piping can allow the release of high energy fluids that not only challenge the
performance of nuclear safety-related systems, but can also cause significant
personnel injury. Degradation of the reactor coolant pressure boundary can
lead to the release of radioactive materials from the reactor coolant system,
thereby reducing the defense-in-depth for the plant
workers and the general public from exposure to radiation.
Materials degradation can... - ✔✔cause costly outages, increase regulatory
oversight, and create losses due to the impact of cost, time, and effort of
station management and personnel.
PWR - ✔✔pressurized water reactor
BWR - ✔✔boiling water reactor
Stress Corrosion Cracking (SCC) - ✔✔Stress corrosion cracking can occur under
Certification Exam Questions and answers
with 100% Complete Solutions | verified
&updated 2024
Strain - ✔✔Whenever a stress (no matter how small) is applied to a metal, a
proportional dimensional change or distortion must take place. Such a
proportional dimensional change (intensity or degree of the distortion) is called
strain and is measured as the total elongation per unit length of material due
to some applied stress.
Strength - ✔✔A measure of the ability of a material to support an applied load.
It is the ability of a material to resist deformation.
Stress - ✔✔-The internal resistance, or counterforce, of a material to the
distorting effects of an external force or load. These counterforces tend to return
the atoms to their normal positions. The total resistance developed is equal to
the external load. This resistance is known as stress.
,-expressed in pounds per square inch.
Toughness - ✔✔A combination of strength and ductility, i.e., the ability or
capacity of material to absorb energy and deform plastically before fracturing.
Toughness describes the way a material reacts under sudden impacts.
Water hammer - ✔✔Water hammer (or, more generally, fluid hammer) is a
pressure surge or wave caused by the kinetic energy of a fluid in motion when it
is forced to stop or change direction suddenly. It depends on the fluid
compressibility where there are sudden changes in pressure. For example, if a
valve is closed suddenly at an end of a pipeline system a water hammer wave
propagates in the pipe. Moving water in a pipe has kinetic energy proportional to
the mass of the water in a given volume times the square of the velocity of the
water.
Why is degradation of materials important? - ✔✔The principle concern with
degradation of materials is nuclear safety. Corrosion that weakens the walls of
, piping can allow the release of high energy fluids that not only challenge the
performance of nuclear safety-related systems, but can also cause significant
personnel injury. Degradation of the reactor coolant pressure boundary can
lead to the release of radioactive materials from the reactor coolant system,
thereby reducing the defense-in-depth for the plant
workers and the general public from exposure to radiation.
Materials degradation can... - ✔✔cause costly outages, increase regulatory
oversight, and create losses due to the impact of cost, time, and effort of
station management and personnel.
PWR - ✔✔pressurized water reactor
BWR - ✔✔boiling water reactor
Stress Corrosion Cracking (SCC) - ✔✔Stress corrosion cracking can occur under
