Insight into the structural integrity assessment of the European DEMO fusion reactor divertor (Part II: Application examples)
•The European DEMO divertor, its development and its structural integrity assessment.•P type and S Type checks, Insights into the RCC MRx code of standards.•Structural integrity code rules interpretation. The DEMO fusion reactor Divertor design group within the EUROfusion consortium use RCC-MRx as t...
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| Vydáno v: | Fusion engineering and design Ročník 215; s. 115046 |
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Elsevier B.V
01.06.2025
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| ISSN: | 0920-3796 |
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| Abstract | •The European DEMO divertor, its development and its structural integrity assessment.•P type and S Type checks, Insights into the RCC MRx code of standards.•Structural integrity code rules interpretation.
The DEMO fusion reactor Divertor design group within the EUROfusion consortium use RCC-MRx as the main analysis code for the Divertor's structural integrity assessment. Analysis has been carried out within the same group using an in-house developed Finite Element Analysis post processing script which follows the Design by Elastic Analysis rules of RCC MRx. A number of stress classification lines (SCLs) were placed in the Divertor component regions which are susceptible to Type P and Type S damage. This paper focuses on two of these stress classification lines. One is located in the region of a stress singularity while the other is in a region of high stress where the temperature is above the creep threshold along part of the SCL. Design by Analysis was performed using a spreadsheet application. The purpose was to highlight difficulties encountered in using the RCC-MRx elastic design methodology applied to the DEMO divertor. Issues mainly arose because of stress singularities in the geometry, because of the inherent non-axisymmetric geometry and loading of the divertor and because of limited material data for Eurofer97 steel which is the main material used for the DEMO Divertor. This paper is Part II of a companion paper and compliments it by considering the two SCLs as application examples and case studies. In the companion paper (Part I), general discussions on the difficulties and issues encountered are presented including some theoretical background on the phenomenon of elastic follow up and on Neuber's hyperbola rule that addresses plasticity and stress relaxation. An additional outcome of this work emphasises the need to further develop the in-house Finite Element Analysis post processing script and to incorporate within it best practice in implementing the RCC-MRx Design by Elastic Analysis rules for the Divertor components. The post processing tool development would improve the assessment reliability and productivity in order to suggest timely Divertor design modifications. |
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| AbstractList | •The European DEMO divertor, its development and its structural integrity assessment.•P type and S Type checks, Insights into the RCC MRx code of standards.•Structural integrity code rules interpretation.
The DEMO fusion reactor Divertor design group within the EUROfusion consortium use RCC-MRx as the main analysis code for the Divertor's structural integrity assessment. Analysis has been carried out within the same group using an in-house developed Finite Element Analysis post processing script which follows the Design by Elastic Analysis rules of RCC MRx. A number of stress classification lines (SCLs) were placed in the Divertor component regions which are susceptible to Type P and Type S damage. This paper focuses on two of these stress classification lines. One is located in the region of a stress singularity while the other is in a region of high stress where the temperature is above the creep threshold along part of the SCL. Design by Analysis was performed using a spreadsheet application. The purpose was to highlight difficulties encountered in using the RCC-MRx elastic design methodology applied to the DEMO divertor. Issues mainly arose because of stress singularities in the geometry, because of the inherent non-axisymmetric geometry and loading of the divertor and because of limited material data for Eurofer97 steel which is the main material used for the DEMO Divertor. This paper is Part II of a companion paper and compliments it by considering the two SCLs as application examples and case studies. In the companion paper (Part I), general discussions on the difficulties and issues encountered are presented including some theoretical background on the phenomenon of elastic follow up and on Neuber's hyperbola rule that addresses plasticity and stress relaxation. An additional outcome of this work emphasises the need to further develop the in-house Finite Element Analysis post processing script and to incorporate within it best practice in implementing the RCC-MRx Design by Elastic Analysis rules for the Divertor components. The post processing tool development would improve the assessment reliability and productivity in order to suggest timely Divertor design modifications. |
| ArticleNumber | 115046 |
| Author | Carrelli, C. Mollicone, P. Hess, J. Muscat, M. Mantel, N. You, J.H. Aleksa, A. |
| Author_xml | – sequence: 1 givenname: M. orcidid: 0000-0001-6129-7539 surname: Muscat fullname: Muscat, M. email: martin.muscat@um.edu.mt organization: Department of Mechanical Engineering, Faculty of Engineering, University of Malta, Malta – sequence: 2 givenname: P. orcidid: 0000-0002-4234-0754 surname: Mollicone fullname: Mollicone, P. organization: Department of Mechanical Engineering, Faculty of Engineering, University of Malta, Malta – sequence: 3 givenname: N. surname: Mantel fullname: Mantel, N. organization: UKAEA (United Kingdom Atomic Energy Authority), Culham Campus, Abingdon, Oxfordshire OX14 3DB, UK – sequence: 4 givenname: J.H. surname: You fullname: You, J.H. organization: IPP (Max Planck Institute for Plasma Physics), Garching, Germany – sequence: 5 givenname: C. orcidid: 0000-0002-0125-2723 surname: Carrelli fullname: Carrelli, C. organization: ENEA (Italian National Agency for New Technologies, Energy and Sustainable Economic Development), Brasimone, Italy – sequence: 6 givenname: A. orcidid: 0009-0007-3426-6180 surname: Aleksa fullname: Aleksa, A. organization: UKAEA (United Kingdom Atomic Energy Authority), Culham Campus, Abingdon, Oxfordshire OX14 3DB, UK – sequence: 7 givenname: J. surname: Hess fullname: Hess, J. organization: UKAEA (United Kingdom Atomic Energy Authority), Culham Campus, Abingdon, Oxfordshire OX14 3DB, UK |
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| Cites_doi | 10.1016/j.fusengdes.2022.113010 10.1016/j.fusengdes.2025.114928 10.1016/j.nme.2016.05.017 10.1016/j.nme.2018.03.001 |
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| Keywords | Structural integrity Fusion reactors RCC-MRx DEMO Divertor Elastic analysis |
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| References | A. Aleksa, DEMO Divertor structural analyses with Global model 2022, DIV-DEMO.S.1-T017-D001 (2022), EUROfusion consortium internal report, IDM reference No. EFDA_D_2Q4BCB. C. Carrelli, Structural integrity assessment for main Divertor EUROFER components under RCC-MRX 2022, EUROfusion consortium internal report, IDM reference No. EFDA_D_2Q478G (2022). Mahler, Ozkan, Aktaa (bib0013) 2016; 9 Muscat, Mollicone, Mantel, You (bib0012) 2025; 214 ASME Boiler and Pressure vessel code, Section VIII, Division 2, Alternative rules. ASME Boiler and Pressure vessel code, Section III, Rules for construction of nuclear facility components, 2015, Division 1 – Subsection NH, Class 1 components in elevated temperature service. D. Marzullo, DEMO_DIVERTOR_2019 model, EUROfusion consortium internal report, IDM reference No. EFDA_D_2NCUJX v2.2. ANSYS WorkBench, ANSYS Mechanical, Academic Research license, Release 2022 R1. (bib0009) 2021 Mahler, Aktaa (bib0014) 2018; 15 M. Muscat, Creep-fatigue assessment tool and shakedown analysis tool, EUROfusion consortium internal report DIV-DEMO.S.4-T002-D002, IDM reference No. EFDA_D_2Q4FBT (2022). J. Hess, Structural integrity assessment for shield liner and reflector plates 2022, DIV-DEMO.S.1-T017-D002 (2022), EUROfusion consortium internal report, IDM reference No. EFDA_D_2Q4BYZ. You (bib0005) 2022; 175 (bib0001) 2018 10.1016/j.fusengdes.2025.115046_bib0007 10.1016/j.fusengdes.2025.115046_bib0006 (10.1016/j.fusengdes.2025.115046_bib0009) 2021 10.1016/j.fusengdes.2025.115046_bib0004 10.1016/j.fusengdes.2025.115046_bib0003 You (10.1016/j.fusengdes.2025.115046_bib0005) 2022; 175 10.1016/j.fusengdes.2025.115046_bib0002 Muscat (10.1016/j.fusengdes.2025.115046_bib0012) 2025; 214 10.1016/j.fusengdes.2025.115046_bib0011 Mahler (10.1016/j.fusengdes.2025.115046_bib0014) 2018; 15 Mahler (10.1016/j.fusengdes.2025.115046_bib0013) 2016; 9 10.1016/j.fusengdes.2025.115046_bib0008 (10.1016/j.fusengdes.2025.115046_bib0001) 2018 10.1016/j.fusengdes.2025.115046_bib0010 |
| References_xml | – reference: ASME Boiler and Pressure vessel code, Section III, Rules for construction of nuclear facility components, 2015, Division 1 – Subsection NH, Class 1 components in elevated temperature service. – volume: 214 year: 2025 ident: bib0012 article-title: Insight into the structural integrity assessment of the European DEMO Fusion Reactor Divertor (Part I: general Discussion) publication-title: Fusion Eng. Design – reference: A. Aleksa, DEMO Divertor structural analyses with Global model 2022, DIV-DEMO.S.1-T017-D001 (2022), EUROfusion consortium internal report, IDM reference No. EFDA_D_2Q4BCB. – reference: C. Carrelli, Structural integrity assessment for main Divertor EUROFER components under RCC-MRX 2022, EUROfusion consortium internal report, IDM reference No. EFDA_D_2Q478G (2022). – reference: ANSYS WorkBench, ANSYS Mechanical, Academic Research license, Release 2022 R1. – volume: 9 start-page: 535 year: 2016 end-page: 538 ident: bib0013 article-title: ANSYS creep-fatigue assessment tool for EUROFER97 components publication-title: Nuclear Mater. Energy – reference: ASME Boiler and Pressure vessel code, Section VIII, Division 2, Alternative rules. – year: 2021 ident: bib0009 article-title: Unfired Pressure Vessels – Part 3: Design – reference: D. Marzullo, DEMO_DIVERTOR_2019 model, EUROfusion consortium internal report, IDM reference No. EFDA_D_2NCUJX v2.2. – volume: 175 year: 2022 ident: bib0005 article-title: Diverter of the European DEMO: engineering and technologies for power exhaust publication-title: Fusion Eng. Des. – year: 2018 ident: bib0001 article-title: Design and construction rules for mechanical components of nuclear installations: high temperature, research and fusion reactors publication-title: AFCEN – reference: M. Muscat, Creep-fatigue assessment tool and shakedown analysis tool, EUROfusion consortium internal report DIV-DEMO.S.4-T002-D002, IDM reference No. EFDA_D_2Q4FBT (2022). – volume: 15 start-page: 85 year: 2018 end-page: 91 ident: bib0014 article-title: Eurofer97 creep-fatigue assessment tool for ANSYS APDL and workbench publication-title: Nucl. Mater. Energy – reference: J. Hess, Structural integrity assessment for shield liner and reflector plates 2022, DIV-DEMO.S.1-T017-D002 (2022), EUROfusion consortium internal report, IDM reference No. EFDA_D_2Q4BYZ. – ident: 10.1016/j.fusengdes.2025.115046_bib0007 – ident: 10.1016/j.fusengdes.2025.115046_bib0006 – ident: 10.1016/j.fusengdes.2025.115046_bib0008 – year: 2018 ident: 10.1016/j.fusengdes.2025.115046_bib0001 article-title: Design and construction rules for mechanical components of nuclear installations: high temperature, research and fusion reactors publication-title: AFCEN – volume: 175 year: 2022 ident: 10.1016/j.fusengdes.2025.115046_bib0005 article-title: Diverter of the European DEMO: engineering and technologies for power exhaust publication-title: Fusion Eng. Des. doi: 10.1016/j.fusengdes.2022.113010 – ident: 10.1016/j.fusengdes.2025.115046_bib0011 – volume: 214 year: 2025 ident: 10.1016/j.fusengdes.2025.115046_bib0012 article-title: Insight into the structural integrity assessment of the European DEMO Fusion Reactor Divertor (Part I: general Discussion) publication-title: Fusion Eng. Design doi: 10.1016/j.fusengdes.2025.114928 – volume: 9 start-page: 535 year: 2016 ident: 10.1016/j.fusengdes.2025.115046_bib0013 article-title: ANSYS creep-fatigue assessment tool for EUROFER97 components publication-title: Nuclear Mater. Energy doi: 10.1016/j.nme.2016.05.017 – ident: 10.1016/j.fusengdes.2025.115046_bib0010 – volume: 15 start-page: 85 year: 2018 ident: 10.1016/j.fusengdes.2025.115046_bib0014 article-title: Eurofer97 creep-fatigue assessment tool for ANSYS APDL and workbench publication-title: Nucl. Mater. Energy doi: 10.1016/j.nme.2018.03.001 – year: 2021 ident: 10.1016/j.fusengdes.2025.115046_bib0009 – ident: 10.1016/j.fusengdes.2025.115046_bib0004 – ident: 10.1016/j.fusengdes.2025.115046_bib0003 – ident: 10.1016/j.fusengdes.2025.115046_bib0002 |
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| SubjectTerms | DEMO Divertor Elastic analysis Fusion reactors RCC-MRx Structural integrity |
| Title | Insight into the structural integrity assessment of the European DEMO fusion reactor divertor (Part II: Application examples) |
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