PSI - Issue 48

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

www.elsevier.com/locate/procedia

ScienceDirect

Procedia Structural Integrity 48 (2023) 302–309

© 2023 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 IRAS 2023 organizers Abstract The paper introduces a Modern Thermomechanics based theoretical approach to Structural Integrity Calculations. The Modern Thermomechanics based Nonlinear Field Theory of Fracture Mechanics framework will lie at the heart of future Structural Integrity Calculations methodologies. An industrial case study illustrates the wide potential of the concept. © 2023 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 IRAS 2023 organizers Keywords: Modern Thermomechanics; Nonlinear Field Theory of Fracture Mechanics; Structural Integrity Calculation Methodology Introduction Large-Scale Engineering Systems ( LSES s) – e.g., power, and chemical plants, etc. – are planned for a limited Service Lifetime ( SL ), called Design Service-Lifetime ( DSL ). During the third quarter of the 20 th century, the DSL of an LSES was generally 30 – 40 Operating Years ( OY ); today, the DSL of a plant – e.g., a Nuclear Power Plant ( NPP ) – , is 60 OY . The Operating License ( OL ) of a new plant is usually granted for its DSL . Large-Scale Pressure Systems ( LSPS s) are of prime importance for the safety of power plants – e.g., NPP s – and heavy chemical facilities; the overall plant SL is governed by the SL of their safety critical LSPS s. During design, Design Safety Calculations ( DSC s) prove the safety of LSPS s, at least up to the DSL . During operation, Structural Integrity Calculations ( SIC s) are performed to robustly assess, under which conditions and for what time – up to the Technically Allowable Lifetime ( TAL ) – the safety of an Second International Symposium on Risk Analysis and Safety of Complex Structures and Components (IRAS 2023) Towards new Fundamentals for Structural Integrity Calculations of Large-Scale Pressure Systems Tamás Fekete a, * a Centre for Energy Research, Konkoly-Thege M. str. 29-33., H-1121 Budapest, Hungary

* Corresponding author. Tel.: +36 1 392 2222 / 3403; fax: +36 1 395 9159. E-mail address: fekete.tamas@ek-cer.hu

2452-3216 © 2023 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 IRAS 2023 organizers

2452-3216 © 2023 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 IRAS 2023 organizers 10.1016/j.prostr.2023.07.128