PSI - Issue 60

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

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Procedia Structural Integrity 60 (2024) 264–276

© 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 © 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 Hydrogen generated due to corrosion reaction is partly absorbed by Zr-2.5%Nb pressure tube (PT) material during service in the Pressurized Heavy Water Reactors (PHWRs). Hydrogen present in excess of the solubility limit get precipitated and embrittles the host PT material. The degree of embrittlement of the host PT matrix is governed by the morphology of the hydride precipitates. An experimental setup was designed, fabricated and used to form hydrides of different morphologies using internal pressurization. The internal pressure during the treatment was sufficient to induce hoop stresses more than the threshold for stress for re-orientation of hydrides in the PT spool. The design of the setup ensured constant pressure inside the PT spool while cooling from hydrogen solutionizing temperature. Metallographic examination of the hydrogen charged PT spool after the reorientation treatment revealed formation of stress reoriented hydrides. Series of burst tests were carried out on the PT spools with varying hydride morphology. The burst pressure as well as the final crack extension were found to be function of hydride morphology. This paper summarizes multiple full scale burst tests performed on as received Zr-2.5%Nb PT spools as well as on PT spools with varying hydride content and morphology. © 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 Third International Conference on Structural Integrity 2023 (ICONS 2023) Effect of Hydride Morphology on Fracture behavior of Zr-2.5%Nb Pressure Tube Material Rishi K Sharma a * , A Gopalan b , R N Singh c , D Bhachawat a , and S M Ingole a a Engineering Directorate, Nuclear Power Corporation of India Limited, Mumbai-400094, India. b Material Development and Technology Division, Indira Gandhi Centre for Atomic Research, Kalpakkam-603102, India. c Mechanical Metallurgy Division, Bhabha Atomic Research Centre, Mumbai-400085, India. Abstract Hydrogen generated due to corrosion reaction is partly absorbed by Zr-2.5%Nb pressure tube (PT) material during service in the Pressurized Heavy Water Reactors (PHWRs). Hydrogen present in excess of the solubility limit get precipitated and embrittles the host PT material. The degree of embrittlement of the host PT matrix is governed by the morphology of the hydride precipitates. An experimental setup was designed, fabricated and used to form hydrides of different morphologies using internal pressurization. The internal pressure during the treatment was sufficient to induce hoop stresses more than the threshold for stress for re-orientation of hydrides in the PT spool. The design of the setup ensured constant pressure inside the PT spool while cooling from hydrogen solutionizing temperature. Metallographic examination of the hydrogen charged PT spool after the reorientation treatment revealed formation of stress reoriented hydrides. Series of burst tests were carried out on the PT spools with varying hydride morphology. The burst pressure as well as the final crack extension were found to be function of hydride morphology. This paper summarizes multiple full scale burst tests performed on as received Zr-2.5%Nb PT spools as well as on PT spools with varying hydride content and morphology. Third International Conference on Structural Integrity 2023 (ICONS 2023) Effect of Hydride Morphology on Fracture behavior of Zr-2.5%Nb Pressure Tube Material Rishi K Sharma a * , A Gopalan b , R N Singh c , D Bhachawat a , and S M Ingole a a Engineering Directorate, Nuclear Power Corporation of India Limited, Mumbai-400094, India. b Material Development and Technology Division, Indira Gandhi Centre for Atomic Research, Kalpakkam-603102, India. c Mechanical Metallurgy Division, Bhabha Atomic Research Centre, Mumbai-400085, India.

Keywords: Pressurized heavy water reator, Zr-2.5%Nb alloy, stress reorientation of hydrides, burst test

* Corresponding author. Tel.: +91-22-2599-4307; fax: +0-000-000-0000 . E-mail address: rishis@npcil.co.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 * Corresponding author. Tel.: +91-22-2599-4307; fax: +0-000-000-0000 . E-mail address: rishis@npcil.co.in

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