tailieunhanh - Nuclear Power System Simulations and Operation Part 12

Tham khảo tài liệu 'nuclear power system simulations and operation part 12', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 154 Nuclear Power - System Simulations and Operation into different load sets and using different design criteria and requirements the safety degree consideration and the occurrence probability of a given load can be introduced in the design evaluation. In accordance with ASME III non-linear design evaluation is an alternative to the linear design evaluation. Depending on which stress intensity limit is violated in the linear design evaluation there are two types of non-linear analysis required in ASME III for the alternative non-linear design evaluations 1 collapse-load analysis and 2 non-linear transient analysis. For clarity such alternative design criteria and requirements which are specified in connection with such non-linear analyses are termed hereby as the non-linear design criteria and requirements. Such non-linear finite element analyses can generally effectively be conducted using general-purpose finite element software such as ANSYS ANSYS 2010 and most other well recognized software. This Chapter is devoted to describe the general procedure for the alternative non-linear piping design and to clarify those relevant non-linear design criteria and requirements. Our emphasis will be placed on the later task as unclear and inconsistent issues have been observed in ASME III when non-linear design criteria and requirements applied. In recent years quite many non-linear analyses and design evaluations have been conducted in Sweden for several power uprate projects. Unfortunately most of such work has always ended with or can never be ended without long discussions on such unclear and inconsistent issues. The Chapter is organized as follows In Section 2 an overview on loading conditions is given. In Section 3 we review the linear design evaluation and discuss the non-linear design evaluation for Class 1 piping systems. In Section 4 the review and discussion are continued for Class 2 and 3 piping. In Section 5 we briefly address the computational procedures for .