PSI - Issue 77

ScienceDirect Structural Integrity Procedia 00 (2026) 000–000 Structural Integrity Procedia 00 (2026) 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 77 (2026) 49–55

© 2026 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 ICSI organizers Abstract This work provides a structural integrity assessment of a spent fuel cask using BS7910 Option 1 Failure Assessment Diagram (FAD). The containment barrier of the analyzed cask is designed following ASME Section III, Division 3, subsection WB. Accordingly, it is necessary to demonstrate the integrity of the materials (base material and welds) all along the range of operation temperatures, based on the determination of the corresponding reference temperature for nil-ductile temperature (RT NDT ). This approach may be very conservative for the case being analyzed, with a low LST (Lowest Service Temperature, -40°C) established to obtain the Certificate of Compliance for a Type B(U) package, and thick wall containment barriers. Thus, the present work provides an alternative analysis to evaluate and guarantee the structural integrity of the cask. The analysis is based on the use of the BS7910 and a number of engineering assumptions for the treatment of material properties, defect types and loading conditions. © 2026 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) International Conference on Structural Integrity Structural integrity assessment of a spent fuel cask by using BS7910 Enrique Gómez a , Alejandro Palacio a , Virginia Madrazo a , Sergio Cicero b,* a ENSA, Avda. Juan Carlos I, 8, Maliaño (Cantabria) – 39600, Spain b Laboratory of Materials Science and Engineering (LADICIM), Departamento de Ciencia e Ingeniería del Terreno y de los Materiales, University of Cantabria, Avenida de los Castros, 44, 39005 Santander, Spain Abstract This work provides a structural integrity assessment of a spent fuel cask using BS7910 Option 1 Failure Assessment Diagram (FAD). The containment barrier of the analyzed cask is designed following ASME Section III, Division 3, subsection WB. Accordingly, it is necessary to demonstrate the integrity of the materials (base material and welds) all along the range of operation temperatures, based on the determination of the corresponding reference temperature for nil-ductile temperature (RT NDT ). This approach may be very conservative for the case being analyzed, with a low LST (Lowest Service Temperature, -40°C) established to obtain the Certificate of Compliance for a Type B(U) package, and thick wall containment barriers. Thus, the present work provides an alternative analysis to evaluate and guarantee the structural integrity of the cask. The analysis is based on the use of the BS7910 and a number of engineering assumptions for the treatment of material properties, defect types and loading conditions. © 2026 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 ICSI organizers Keywords: structural integrigy; spent fuel cask; BS7910 1. Introduction The regulations applicable to ENUN casks (see Figure 1) establish the need to validate the design of transport packages under a wide variety of environmental conditions. Thus, when applying for the approval of spent fuel transport as Type B(U) packages under the European Agreement concerning the International Carriage of Dangerous Goods by Road (ADR) (2025), it is necessary to guarantee the structural integrity of ENUN casks at a minimum International Conference on Structural Integrity Structural integrity assessment of a spent fuel cask by using BS7910 Enrique Gómez a , Alejandro Palacio a , Virginia Madrazo a , Sergio Cicero b,* a ENSA, Avda. Juan Carlos I, 8, Maliaño (Cantabria) – 39600, Spain b Laboratory of Materials Science and Engineering (LADICIM), Departamento de Ciencia e Ingeniería del Terreno y de los Materiales, University of Cantabria, Avenida de los Castros, 44, 39005 Santander, Spain Peer-review under responsibility of ICSI organizers Keywords: structural integrigy; spent fuel cask; BS7910 1. Introduction The regulations applicable to ENUN casks (see Figure 1) establish the need to validate the design of transport packages under a wide variety of environmental conditions. Thus, when applying for the approval of spent fuel transport as Type B(U) packages under the European Agreement concerning the International Carriage of Dangerous Goods by Road (ADR) (2025), it is necessary to guarantee the structural integrity of ENUN casks at a minimum

* Corresponding author. Tel.: +34 942 201819 E-mail address: ciceros@unican.es * Corresponding author. Tel.: +34 942 201819 E-mail address: ciceros@unican.es

2452-3216 © 2026 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 scientific committee of the ICSI 2025 organizers 2452-3216 © 2026 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 scientific committee of the ICSI 2025 organizers

2452-3216 © 2026 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 ICSI organizers 10.1016/j.prostr.2026.01.008