Brittle Fracture DOE-HDBK-1017/2-93 OBJECTIVESTERMINAL OBJECTIVE1.0 Without references, EXPLAIN the importance of controlling heatup and cooldown ratesof the primary coolant system.ENABLING OBJECTIVES1.1DEFINE the following terms:a. Ductile fractureb. Brittle fracturec. Nil-ductility Transition (NDT) Temperature1.2DESCRIBE the two changes made to reactor pressure vessels to decrease NDT.1.3STATE the effect grain size and irradiation have on a material’s NDT.1.4LIST the three conditions necessary for brittle fracture to occur.1.5STATE the three conditions that tend to mitigate crack initiation.1.6LIST the five factors that determine the fracture toughness of a material.1.7 Given a stress-temperature diagram, IDENTIFY the following points:a. NDT (with no flaw)b. NDT (with flaw)c. Fracture transition elastic pointd. Fracture transition plastic point1.8STATE the two bases used for developing a minimum pressurization-temperature curve.1.9EXPLAIN a typical minimum pressure-temperature curve including:a. Location of safe operating regionb. The way the curve will shift due to irradiationRev. 0 Page v MS-04
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