PSI - Issue 60

Rosy Sarkar et al. / Procedia Structural Integrity 60 (2024) 75–92 Rosy Sarkar/ StructuralIntegrity Procedia 00 (2019) 000 – 000

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an expansion tank located on the downstream side of the Na-Na DHX of SGDHR circuit at the topmost elevation to take care of the volumetric expansion of intermediate sodium due to changes in temperature from filling condition to normal operation, reactor shutdown, and decay heat removal [Dubey et al. (2004)]. Each loop consists of two hotlines (from DHX outlet to the expansion tank inlet and expansion tank outlet to AHX inlet), and one cold line (from AHX outlet to DHX inlet), as shown in Figure 1 [Suresh Kumar et al. (2014)]. The SGDHR piping system consists of 200 NB pipe bends that are 4 mm thick, and the design pressure for the SGDHR main and fast dump lines are 7 bars [Sudhakar et al. (2007)]. Ratcheting studies have been envisaged to identify the combination of loading conditions that can result in ratcheting in the pipe bend. Towards this, a finite element analysis has been carried out to predict the displacement applied on one end, with the other end fixed, that can cause ratcheting in the pipe bend. Elastic and elasto-perfectly plastic analyses have been carried out in the present work, to compare the conservatism in each approach.

Figure 1 SGDHR Piping Layout [4]