Fast Reactors and Accelerator Driven Systems Knowledge Base

Conference Article: Designing of fast reactor equipment and pipelines: Normative method for calculation of long-term cyclic strength

Abstract

The paper deals with the method for calculational analysis of long-term cyclic strength recommended by ''Norms for strength...'' to estimate cyclic damage of equipment items being operated at temperatures which cause creep and loaded by repeated thermal or mechanical forces. The paper gives formulae interrelating amplitude of allowable conditional elastic stresses [sigma_AF] and allowable number [N₀] of cycles, as well as calculational fatigue curves for alloyed steels, corrosion-resistant austenitic steels at loading duration of 10⁵ hours. The paper describes the method for calculational analysis of long-term cyclic strength for items made from steels with non-metallic inclusions, for items contacting with corrosion-aggressive media, welded joints etc. An example of calculational analysis of long-term cyclic strength by the use of recommended normative method is given. It is shown that the item analyzed as an example (the joint of upper tube sheet of BN-600 intermediate heat exchanger and outer shell) has cyclic strength meeting the requirements of ''Norms for strength...'' valid in Russia.

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Reference:

Creep-fatigue damage rules for advanced fast reactor design. Technical committee meeting, Manchester (United Kingdom). 11-13 Jun 1996

International Atomic Energy Agency, Vienna (Austria)

IAEA-TECDOC--933, pp:31-46