Without references, EXPLAIN the importance of controlling heatup and cooldown rates
of the primary coolant system.
DEFINE the following terms:
Nil-ductility Transition (NDT) Temperature
DESCRIBE the two changes made to reactor pressure vessels to decrease NDT.
STATE the effect grain size and irradiation have on a materials NDT.
LIST the three conditions necessary for brittle fracture to occur.
STATE the three conditions that tend to mitigate crack initiation.
LIST the five factors that determine the fracture toughness of a material.
Given a stress-temperature diagram, IDENTIFY the following points:
NDT (with no flaw)
NDT (with flaw)
Fracture transition elastic point
Fracture transition plastic point
STATE the two bases used for developing a minimum pressurization-temperature curve.
EXPLAIN a typical minimum pressure-temperature curve including:
Location of safe operating region
The way the curve will shift due to irradiation