PSI - Issue 60

First page Table of contents Previous page 54 Next page Last page

ScienceDirect StructuralIntegrity Procedia 00 (2023) 000 – 000 StructuralIntegrity Procedia 00 (2023) 000 – 000 Available online at www.sciencedirect.com Available online at www.sciencedirect.com ScienceDirect Available online at www.sciencedirect.com ScienceDirect

www.elsevier.com/locate/procedia www.elsevier.com/locate/procedia

Procedia Structural Integrity 60 (2024) 75–92

© 2024 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the ICONS 2023 Organizers Abstract The possibility of ratcheting in the 200 NB pipe bends of the SGDHR system has been analytically studied. Elastic analysis with a sustained load on internal pressure at 7 bars and deformation-controlled cyclic displacement of 20 mm amplitude is carried out. The results suggest that the outer surface of the pipe bend crown region becomes the potential location for the cyclic accumulation of strain. The ratcheting possibility is also verified using the conventional design standard procedure of RCC MRx and ASME. It is observed that ASME is more conservative than RCC MRx, and predicts lower displacement to initiate ratcheting. Elasto-perfectly plastic analysis carried out at 7 bar pressure and various displacements shows an elastic shakedown at lower displacements. Initiation of ratcheting at 7 bars is predicted at 35 mm and 18 mm displacements at room temperature and 600 ℃ , respectively. It is observed that the ratcheting strains stabilize at higher cycles. The magnitude of the stabilized strain and number of cycles increases with an increase in the amplitude of cyclic loading for a prototype pipe bend. © 2024 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the ICONS 2023 Organizers Keywords: SGDHR; pipebend; ABAQUS; ratcheting; ASME; RCCMR; elasto-perfectly plastic; elastic; 1. Introduction The Safety Grade Decay Heat Removal (SGDHR) system is a fully passive decay heat removal system in Prototype Fast Breeder Reactor (PFBR). It consists of four special thermo-siphon loops in natural convection mode. Each loop caters to a heat removal capacity of 8 MWt at a hot pool temperature of 544 ℃ [Manoj et al. (2020)]. Each loop consists of a sodium-to-sodium shell and tube heat exchangers (DHX), intermediate sodium loop, sodium-to-air heat exchanger (AHX), chimney and damper with air as the ultimate heat sink [Padmakumar et al. (2020)]. There is Abstract The possibility of ratcheting in the 200 NB pipe bends of the SGDHR system has been analytically studied. Elastic analysis with a sustained load on internal pressure at 7 bars and deformation-controlled cyclic displacement of 20 mm amplitude is carried out. The results suggest that the outer surface of the pipe bend crown region becomes the potential location for the cyclic accumulation of strain. The ratcheting possibility is also verified using the conventional design standard procedure of RCC MRx and ASME. It is observed that ASME is more conservative than RCC MRx, and predicts lower displacement to initiate ratcheting. Elasto-perfectly plastic analysis carried out at 7 bar pressure and various displacements shows an elastic shakedown at lower displacements. Initiation of ratcheting at 7 bars is predicted at 35 mm and 18 mm displacements at room temperature and 600 ℃ , respectively. It is observed that the ratcheting strains stabilize at higher cycles. The magnitude of the stabilized strain and number of cycles increases with an increase in the amplitude of cyclic loading for a prototype pipe bend. © 2024 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the ICONS 2023 Organizers Keywords: SGDHR; pipebend; ABAQUS; ratcheting; ASME; RCCMR; elasto-perfectly plastic; elastic; 1. Introduction The Safety Grade Decay Heat Removal (SGDHR) system is a fully passive decay heat removal system in Prototype Fast Breeder Reactor (PFBR). It consists of four special thermo-siphon loops in natural convection mode. Each loop caters to a heat removal capacity of 8 MWt at a hot pool temperature of 544 ℃ [Manoj et al. (2020)]. Each loop consists of a sodium-to-sodium shell and tube heat exchangers (DHX), intermediate sodium loop, sodium-to-air heat exchanger (AHX), chimney and damper with air as the ultimate heat sink [Padmakumar et al. (2020)]. There is Third International Conference on Structural Integrity 2023 (ICONS 2023) Assessment of Ratcheting in SGDHR Pipe Bend based on Linear and Bi-linear Analysis Rosy Sarkar a *, Bhuwan Chandra Sati a , R. Suresh Kumar a a Reactor Design & Technology Group, Indira Gandhi Center for Atomic Research, Kalpakkam 603102, India Third International Conference on Structural Integrity 2023 (ICONS 2023) Assessment of Ratcheting in SGDHR Pipe Bend based on Linear and Bi-linear Analysis Rosy Sarkar a *, Bhuwan Chandra Sati a , R. Suresh Kumar a a Reactor Design & Technology Group, Indira Gandhi Center for Atomic Research, Kalpakkam 603102, India

* Corresponding author. Tel.: 044-27480500-21692; fax: +0-000-000-0000 . E-mail address: rosy@igcar.gov.in * Corresponding author. Tel.: 044-27480500-21692; fax: +0-000-000-0000 . E-mail address: rosy@igcar.gov.in

2452-3216© 2024 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the ICONS 2023 Organizers 2452-3216© 2024 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the ICONS 2023 Organizers

Made with FlippingBook Learn more on our blog