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<article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:ali="http://www.niso.org/schemas/ali/1.0/" article-type="research-article" dtd-version="1.2" xml:lang="en"><front><journal-meta><journal-id journal-id-type="publisher-id">Trudy NGTU im. R.E. Alekseeva</journal-id><journal-title-group><journal-title xml:lang="en">Trudy NGTU im. R.E. Alekseeva</journal-title><trans-title-group xml:lang="ru"><trans-title>Труды НГТУ им. Р.Е. Алексеева</trans-title></trans-title-group></journal-title-group><issn publication-format="print">1816-210X</issn><publisher><publisher-name xml:lang="en">Nizhny Novgorod State Technical University n.a. R.E. Alekseev</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="publisher-id">680786</article-id><article-id pub-id-type="edn">FXXVYZ</article-id><article-categories><subj-group subj-group-type="toc-heading" xml:lang="en"><subject>NUCLEAR POWER AND ATOMIC POWER ENGINEERING</subject></subj-group><subj-group subj-group-type="toc-heading" xml:lang="ru"><subject>Ядерная энергетика и атомное машиностроение</subject></subj-group><subj-group subj-group-type="article-type"><subject>Research Article</subject></subj-group></article-categories><title-group><article-title xml:lang="en">Testing of multi-loop circuit in natural circulation mode of lead-bismuth coolant</article-title><trans-title-group xml:lang="ru"><trans-title>Тестирование многопетлевого контура в режиме естественной циркуляции свинцово-висмутового теплоносителя</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0009-0005-3861-6630</contrib-id><name-alternatives><name xml:lang="en"><surname>Pribaturin</surname><given-names>N. A.</given-names></name><name xml:lang="ru"><surname>Прибатурин</surname><given-names>Н. А.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>nialp@ibrae.ac.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-3020-6021</contrib-id><name-alternatives><name xml:lang="en"><surname>Lobanov</surname><given-names>P. D.</given-names></name><name xml:lang="ru"><surname>Лобанов</surname><given-names>П. Д.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>lobanov@itp.nsc.ru</email><xref ref-type="aff" rid="aff2"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-1833-0484</contrib-id><name-alternatives><name xml:lang="en"><surname>Kurdyumov</surname><given-names>A. S.</given-names></name><name xml:lang="ru"><surname>Курдюмов</surname><given-names>А. С.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>kurdumov@itp.nsc.ru</email><xref ref-type="aff" rid="aff2"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0009-0000-3540-4070</contrib-id><name-alternatives><name xml:lang="en"><surname>Svetonosov</surname><given-names>A. I.</given-names></name><name xml:lang="ru"><surname>Светоносов</surname><given-names>А. И.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>svetonosov.a.i@gmail.com</email><xref ref-type="aff" rid="aff2"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0003-3011-7464</contrib-id><name-alternatives><name xml:lang="en"><surname>Chinak</surname><given-names>A. V.</given-names></name><name xml:lang="ru"><surname>Чинак</surname><given-names>А. В.</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><email>chinak@mail.ru</email><xref ref-type="aff" rid="aff2"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">Nuclear Safety Institute RAS</institution></aff><aff><institution xml:lang="ru">Институт проблем безопасного развития атомной энергетики РАН</institution></aff></aff-alternatives><aff-alternatives id="aff2"><aff><institution xml:lang="en">Kutateladze Institute of Thermophysics SB RAS</institution></aff><aff><institution xml:lang="ru">Институт теплофизики им. С.С. Кутателадзе СО РАН</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2025-01-30" publication-format="electronic"><day>30</day><month>01</month><year>2025</year></pub-date><issue>1</issue><issue-title xml:lang="en"/><issue-title xml:lang="ru"/><fpage>50</fpage><lpage>58</lpage><history><date date-type="received" iso-8601-date="2025-05-27"><day>27</day><month>05</month><year>2025</year></date><date date-type="accepted" iso-8601-date="2025-05-27"><day>27</day><month>05</month><year>2025</year></date></history><permissions><copyright-statement xml:lang="en">Copyright ©; 2025, Pribaturin N.A., Lobanov P.D., Kurdyumov A.S., Svetonosov A.I., Chinak A.V.</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2025, Прибатурин Н.А., Лобанов П.Д., Курдюмов А.С., Светоносов А.И., Чинак А.В.</copyright-statement><copyright-year>2025</copyright-year><copyright-holder xml:lang="en">Pribaturin N.A., Lobanov P.D., Kurdyumov A.S., Svetonosov A.I., Chinak A.V.</copyright-holder><copyright-holder xml:lang="ru">Прибатурин Н.А., Лобанов П.Д., Курдюмов А.С., Светоносов А.И., Чинак А.В.</copyright-holder><ali:free_to_read xmlns:ali="http://www.niso.org/schemas/ali/1.0/"/><license><ali:license_ref xmlns:ali="http://www.niso.org/schemas/ali/1.0/">https://creativecommons.org/licenses/by/4.0</ali:license_ref></license></permissions><self-uri xlink:href="https://journals.eco-vector.com/1816-210X/article/view/680786">https://journals.eco-vector.com/1816-210X/article/view/680786</self-uri><abstract xml:lang="en"><p>The article presents the results of test bench with a liquid metal coolant with four circulation circuits connected in the upper chamber: one heat source in the form of a seven-rod fuel assembly simulator and four heat exchangers removing heat from each circuit. Data on the mode of natural circulation of lead-bismuth melt in two- and four-loop circulation systems, as well as data on changes in the natural circulation mode when the heat transfer in one of the circulation loops is disrupted are obtained.</p></abstract><trans-abstract xml:lang="ru"><p>Приведены результаты тестирования стенда с жидкометаллическим теплоносителем, имеющего четыре циркуляционных контура, соединяющихся в верхней камере: один источник тепловыделения в виде семистержневого имитатора тепловыделяющей сборки и четыре теплообменника, отводящие тепло от каждого контура. Получены данные по режиму естественной циркуляции свинцово-висмутового расплава в двух- и четырехпетлевой циркуляционной системе, данные по изменению режима естественной циркуляции при нарушении отвода тепла от одной из циркуляционных петель.</p></trans-abstract><kwd-group xml:lang="en"><kwd>reactor plant</kwd><kwd>heavy liquid metal coolant</kwd><kwd>natural circulation</kwd><kwd>multi-loop circuit</kwd><kwd>fuel assembly</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>реакторная установка</kwd><kwd>тяжелый жидкометаллический теплоноситель</kwd><kwd>естественная циркуляция</kwd><kwd>многопетлевой контур</kwd><kwd>тепловыделяющая сборка</kwd></kwd-group><funding-group><funding-statement xml:lang="ru">Исследование выполнено в рамках Государственного контракта № Н.4о.241.19.21.1054 от 08.04.2021 на выполнение научно-исследовательской работы «Развитие интегрированной системы кодов нового поколения для разработки, обоснования безопасности, оптимизации и проведения виртуальных испытаний технологий и установок ПЭК. Этап 2021-2023 гг.</funding-statement></funding-group></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><mixed-citation>C. Bertani, A. Bersano, M. De Salve, G. Sobrero. Experimental analysis of the start-up of a natural circulation loop in single and two-phase flow. Nuclear Engineering and Design, 2021. V. 385/ № 15.</mixed-citation></ref><ref id="B2"><label>2.</label><mixed-citation>A. Borgohain, et. аl. Natural circulation studies in a LBE loop for a wide range of temperature. Nuclear Engineering and Design, V. 300. 2016, Pр. 358-375.</mixed-citation></ref><ref id="B3"><label>3.</label><mixed-citation>Leitai Shi, et.al. Experimental study on the natural circulation capability and heat transfer characteristic of liquid lead bismuth eutectic. Progress in Nuclear Energy. V. 115. 2019, Pр. 99-106.</mixed-citation></ref><ref id="B4"><label>4.</label><mixed-citation>D. Grishchenko, et al. 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