PSI - Issue 68

Available online at www.sciencedirect.com Structural Integrity Procedia 00 (2025) 000–000 Available online at www.sciencedirect.com ScienceDirect

www.elsevier.com/locate/procedia

ScienceDirect

Procedia Structural Integrity 68 (2025) 1305–1311

European Conference on Fracture 2024 Stress intensity factors in pressurised thermal shock analysis for through clad defects in a WWER type reactor pressure vessel Vitalii Antonchenko a,b *, Yaroslav Dubyk a,c , Volodymyr Iasnii b a LLC “IPP-Centre”, Kyiv 01013, Ukraine Abstract This study focuses on the applicability of stress intensity factor solution for the cladded WWER forging. Analytical K1 solutions are still actual and important for the fast methods of SIF evaluation., like for the on-line stress monitoring tools, methods for probabilistic analysis or for the special procedures developed for PTS scenario ranging, with further detailed analysis using EPFM and FEM. In the present study comparison with national and international codified solution is performed, it is shown that national standard is unacceptable for the fracture mechanics evaluation of PTS event. © 2025 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 ECF24 organizers 1. Introduction Assessment of the brittle strength is essential for nuclear components, including 1st class equipment. Actually, brittle strength determines the allowable term of operation for the Reactor Pressure Vessel (RPV). Also, it plays a key role in structural integrity evaluation for other reactor components like Core Baffle and Core Barrel. Evaluation of brittle margin splits into two tasks: the first one is about materials and ageing – evaluation of K Ic , the second one is about the evaluation of the stress intensity factor (SIF). The present study focuses on the second one aspect and, more © 2025 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 ECF24 organizers b Ternopil Ivan Puluj National Technical University, 56, Ruska Str., Ternopil, 46001, Ukraine c Karpenko Physico-Mechanical Institute of the NAS of Ukraine, Lviv 79060, Ukraine Keywords: PTS analysis, polynomial solution, stress intensity factor, fracture of the cladded componenet

* Corresponding author. Tel.: +38-044-502-45-70. E-mail address: antonchenko-vo@ipp-centre.com.ua.

2452-3216 © 2025 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 ECF24 organizers

2452-3216 © 2025 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 ECF24 organizers 10.1016/j.prostr.2025.06.203