Abstract:
The ASME B&PV Code Section Ⅲ– Division 1 – Subsection NB Design-by-Analysis(NB-3200) approach provides stress limits for the design of nuclear components.In the present paper,the failure modes in nuclear components are identified.The characteristic of Design-by-Analysis was presented.Moreover,the technical basis and background on some criteria of NB-3200 is presented.Specifically,shakedown and ratcheting(NB-3222.2),thermal stress ratcheting(NB-3222.5),simplified elastic-plastic analysis(NB-3228.3),Poisson’s ratio correction(NB-3227.6) and fatigue(NB-3222.4).The author hopes that the above discussion will deepen the analyst’s understanding of the code and help them have better practical application of the code.