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Material Science_ Vol 2 of 2 - US DOE (1993) WW part 5

Tham khảo tài liệu 'material science_ vol 2 of 2 - us doe (1993) ww part 5', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Brittle Fracture DOE-HDBK-1017 2-93 OBJECTIVES TERMINAL OBJECTIVE 1.0 Without references EXPLAIN the importance of controlling heatup and cooldown rates of the primary coolant system. ENABLING OBJECTIVES 1.1 DEFINE the following terms a. Ductile fracture b. Brittle fracture c. Nil-ductility Transition NDT Temperature 1.2 DESCRIBE the two changes made to reactor pressure vessels to decrease NDT. 1.3 STATE the effect grain size and irradiation have on a material s NDT. 1.4 LIST the three conditions necessary for brittle fracture to occur. 1.5 STATE the three conditions that tend to mitigate crack initiation. 1.6 LIST 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 point d. Fracture transition plastic point 1.8 STATE the two bases used for developing a minimum pressurization-temperature curve. 1.9 EXPLAIN a typical minimum pressure-temperature curve including a. Location of safe operating region b. The way the curve will shift due to irradiation Rev. 0 Page v MS-04 OBJECTIVES DOE-HDBK-1017 2-93 Brittle Fracture ENABLING OBJECTIVES Cont. 1.10 LIST the normal actions taken in sequence if the minimum pressurization-temperature curve is exceeded during critical operations. 1.11 STATE the precaution for hydrostatic testing. 1.12 IDENTIFY the basis used for determining heatup and cooldown rate limits. 1.13 IDENTIFY the three components that will set limits on the heatup and cooldown rates. 1.14 STATE the action typically taken upon discovering the heatup or cooldown rate has been exceeded. 1.15 STATE the reason for using soak times. 1.16 STATE when soak times become very significant. MS-04 Page vi Rev. 0 Brittle Fracture DOE-HDBK-1017 2-93 BRITTLE FRACTURE MECHANISM BRITTLE FRACTURE MECHANISM Personnel need to understand brittle fracture. This type of fracture occurs under specific conditions without warning and can .