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Dynamic modeling of reactivity control systems for scram reliability assessment in fast reactors under seismic conditions

Matt Bonney Orcid Logo, Maxime Zabiégo

Nuclear Engineering and Design, Volume: 361, Start page: 110546

Swansea University Author: Matt Bonney Orcid Logo

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DOI (Published version): 10.1016/j.nucengdes.2020.110546

Abstract

Reactivity Control Systems (i.e., control rods and the associated drive mechanisms) are essential components to ensure the safe operation of nuclear reactors. Their design is particularly challenging during seismic events, due to the large deformations these impose on the core, which have the potent...

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Published in: Nuclear Engineering and Design
ISSN: 0029-5493
Published: Elsevier BV 2020
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URI: https://cronfa.swan.ac.uk/Record/cronfa65036
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spelling v2 65036 2023-11-21 Dynamic modeling of reactivity control systems for scram reliability assessment in fast reactors under seismic conditions 323110cf11dcec3e8183228a4b33e06d 0000-0002-1499-0848 Matt Bonney Matt Bonney true false 2023-11-21 AERO Reactivity Control Systems (i.e., control rods and the associated drive mechanisms) are essential components to ensure the safe operation of nuclear reactors. Their design is particularly challenging during seismic events, due to the large deformations these impose on the core, which have the potential of hindering the insertion of the neutron absorbing material and delaying reactor shutdown. In order to assist the design process, the PIRAT toolbox is currently being developed for analytical based modeling of such systems. The present paper focuses on the development of the dynamic module DEBSE, and its application to Fast Reactor systems. Preliminary computations, based on simplified models and excitation that are progressively enriched to represent realistic situations, emphasize the role of dynamic effects. These computations show both situations where the static analysis is sufficient and insufficient to assess scram reliability due to their conservatism. While there are some issues with the numerical conditioning for this system, the results shows that for the most realistic seismic excitation available, safe shutdown is expected to occur with dynamic amplification occurring after the shutdown. This work also indicates possible causes to the ill-conditioning and what parameters are determined based on expert opinion that can be adjusted to better condition the equations of motion. Overall, this work shows the progress of PIRAT and shows examples of how it can be used for reactivity control system design. Journal Article Nuclear Engineering and Design 361 110546 Elsevier BV 0029-5493 Reactivity control system, Sodium-cooled fast reactor, Mechanical contact, PIRAT, Insertion reliability, Seismic safety 31 5 2020 2020-05-31 10.1016/j.nucengdes.2020.110546 http://dx.doi.org/10.1016/j.nucengdes.2020.110546 COLLEGE NANME Aerospace Engineering COLLEGE CODE AERO Swansea University 2024-01-02T15:41:35.8328147 2023-11-21T09:33:03.7381731 Faculty of Science and Engineering School of Aerospace, Civil, Electrical, General and Mechanical Engineering - Aerospace Engineering Matt Bonney 0000-0002-1499-0848 1 Maxime Zabiégo 2
title Dynamic modeling of reactivity control systems for scram reliability assessment in fast reactors under seismic conditions
spellingShingle Dynamic modeling of reactivity control systems for scram reliability assessment in fast reactors under seismic conditions
Matt Bonney
title_short Dynamic modeling of reactivity control systems for scram reliability assessment in fast reactors under seismic conditions
title_full Dynamic modeling of reactivity control systems for scram reliability assessment in fast reactors under seismic conditions
title_fullStr Dynamic modeling of reactivity control systems for scram reliability assessment in fast reactors under seismic conditions
title_full_unstemmed Dynamic modeling of reactivity control systems for scram reliability assessment in fast reactors under seismic conditions
title_sort Dynamic modeling of reactivity control systems for scram reliability assessment in fast reactors under seismic conditions
author_id_str_mv 323110cf11dcec3e8183228a4b33e06d
author_id_fullname_str_mv 323110cf11dcec3e8183228a4b33e06d_***_Matt Bonney
author Matt Bonney
author2 Matt Bonney
Maxime Zabiégo
format Journal article
container_title Nuclear Engineering and Design
container_volume 361
container_start_page 110546
publishDate 2020
institution Swansea University
issn 0029-5493
doi_str_mv 10.1016/j.nucengdes.2020.110546
publisher Elsevier BV
college_str Faculty of Science and Engineering
hierarchytype
hierarchy_top_id facultyofscienceandengineering
hierarchy_top_title Faculty of Science and Engineering
hierarchy_parent_id facultyofscienceandengineering
hierarchy_parent_title Faculty of Science and Engineering
department_str School of Aerospace, Civil, Electrical, General and Mechanical Engineering - Aerospace Engineering{{{_:::_}}}Faculty of Science and Engineering{{{_:::_}}}School of Aerospace, Civil, Electrical, General and Mechanical Engineering - Aerospace Engineering
url http://dx.doi.org/10.1016/j.nucengdes.2020.110546
document_store_str 0
active_str 0
description Reactivity Control Systems (i.e., control rods and the associated drive mechanisms) are essential components to ensure the safe operation of nuclear reactors. Their design is particularly challenging during seismic events, due to the large deformations these impose on the core, which have the potential of hindering the insertion of the neutron absorbing material and delaying reactor shutdown. In order to assist the design process, the PIRAT toolbox is currently being developed for analytical based modeling of such systems. The present paper focuses on the development of the dynamic module DEBSE, and its application to Fast Reactor systems. Preliminary computations, based on simplified models and excitation that are progressively enriched to represent realistic situations, emphasize the role of dynamic effects. These computations show both situations where the static analysis is sufficient and insufficient to assess scram reliability due to their conservatism. While there are some issues with the numerical conditioning for this system, the results shows that for the most realistic seismic excitation available, safe shutdown is expected to occur with dynamic amplification occurring after the shutdown. This work also indicates possible causes to the ill-conditioning and what parameters are determined based on expert opinion that can be adjusted to better condition the equations of motion. Overall, this work shows the progress of PIRAT and shows examples of how it can be used for reactivity control system design.
published_date 2020-05-31T15:41:37Z
_version_ 1786993807483469824
score 11.035655

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