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<article article-type="research-article" dtd-version="1.3" 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" xml:lang="ru"><front><journal-meta><journal-id journal-id-type="publisher-id">nuc</journal-id><journal-title-group><journal-title xml:lang="ru">Вестник НЯЦ РК</journal-title><trans-title-group xml:lang="en"><trans-title>NNC RK Bulletin</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">1729-7516</issn><issn pub-type="epub">1729-7885</issn><publisher><publisher-name>Национальный ядерный центр Республики Казахстан</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.52676/1729-7885-2025-4-55-64</article-id><article-id custom-type="elpub" pub-id-type="custom">nuc-895</article-id><article-categories><subj-group subj-group-type="heading"><subject>Research Article</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="ru"><subject>Статьи</subject></subj-group></article-categories><title-group><article-title>РАЗРАБОТКА И АНАЛИЗ ТЕПЛОФИЗИЧЕСКОЙ МОДЕЛИ ОБЛУЧАТЕЛЬНОЙ КАПСУЛЫ, ПРЕДНАЗНАЧЕННОЙ ДЛЯ ПРОИЗВОДСТВА Mo-99 В РЕАКТОРЕ ВВР-К</article-title><trans-title-group xml:lang="en"><trans-title>DEVELOPMENT AND THERMOPHYSICAL ANALYSIS OF AN IRRADIATION CAPSULE MODEL  FOR Mo-99 PRODUCTION IN THE WWR-K REACTOR</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0009-0001-9214-9966</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Ашибаев</surname><given-names>А. Ч.</given-names></name><name name-style="western" xml:lang="en"><surname>Ashibayev</surname><given-names>A. Ch.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Алматы</p></bio><bio xml:lang="en"><p>Almaty</p></bio><email xlink:type="simple">arystanashibayev29@gmail.com</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0001-7587-3461</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Сайранбаев</surname><given-names>Д. С.</given-names></name><name name-style="western" xml:lang="en"><surname>Sairanbayev</surname><given-names>D. S.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Алматы</p></bio><bio xml:lang="en"><p>Almaty</p></bio><email xlink:type="simple">d.sairanbayev@inp.kz</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0003-0304-2049</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Шаймерденов</surname><given-names>А. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Shaimerdenov</surname><given-names>A. A.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Алматы</p></bio><bio xml:lang="en"><p>Almaty</p></bio><email xlink:type="simple">ashaimerdenov@inp.kz</email><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru">РГП «Институт ядерной физики» Агентства Республики Казахстан по атомной энергии<country>Казахстан</country></aff><aff xml:lang="en">RSE “Institute of Nuclear Physics” of the Agency of the Republic of Kazakhstan for Atomic Energy<country>Kazakhstan</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2025</year></pub-date><pub-date pub-type="epub"><day>08</day><month>12</month><year>2025</year></pub-date><volume>0</volume><issue>4</issue><fpage>55</fpage><lpage>64</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Ашибаев А.Ч., Сайранбаев Д.С., Шаймерденов А.А., 2025</copyright-statement><copyright-year>2025</copyright-year><copyright-holder xml:lang="ru">Ашибаев А.Ч., Сайранбаев Д.С., Шаймерденов А.А.</copyright-holder><copyright-holder xml:lang="en">Ashibayev A.C., Sairanbayev D.S., Shaimerdenov A.A.</copyright-holder><license xml:lang="ru" license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>Данная работа распространяется под лицензией Creative Commons Attribution 4.0.</license-p></license><license xml:lang="en" license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>This work is licensed under a Creative Commons Attribution 4.0 License.</license-p></license></permissions><self-uri xlink:href="https://journals.nnc.kz/jour/article/view/895">https://journals.nnc.kz/jour/article/view/895</self-uri><abstract><p>В настоящей работе представлены результаты теплофизического анализа конструкции облучательной капсулы, предназначенной для повышения удельной активности 99Mo в исследовательском реакторе ВВР-К. Численное моделирование было проведено в программном комплексе ANSYS Fluent 2021 R2 для трёх предложенных конфигураций активной зоны. Показано, что разработанная конструкция облучательного устройства обеспечивает надёжный тепловой режим при максимальной температуре порошка триоксида молибдена, равной 152,6 ℃, и температуре теплоносителя, не превышающей 50,1 ℃. Результаты подтверждают безопасность эксплуатации облучательного устройства на реакторе ВВР-К как в бериллиевой ловушке в центре активной зоны, так и в штатной высокопоточной ячейке. </p></abstract><trans-abstract xml:lang="en"><p>The paper presents the results of a thermophysical analysis of an irradiation capsule design intended to increase the specific activity of 99Mo in the WWR-K research reactor. Numerical simulations were performed using the ANSYS Fluent 2021 R2 software package for three configurations of the reactor core, including the standard irradiation capsule. It is demonstrated that the developed irradiation device ensures a reliable thermal regime, with the maximum temperature of molybdenum trioxide powder reaching 152.6 ℃ and the coolant temperature not exceeding 50.1 ℃. The results confirm the safe operation of the irradiation device within various core configurations of the WWR-K reactor.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>исследовательский реактор</kwd><kwd>молибден-99</kwd><kwd>облучательное устройство</kwd><kwd>тепловой режим</kwd><kwd>теплофизическая модель</kwd></kwd-group><kwd-group xml:lang="en"><kwd>research reactor</kwd><kwd>molybdenum-99</kwd><kwd>irradiation device</kwd><kwd>thermal regime</kwd><kwd>thermophysical model</kwd></kwd-group></article-meta></front><back><ref-list><title>References</title><ref id="cit1"><label>1</label><citation-alternatives><mixed-citation xml:lang="ru">Li J., Xie R., Li B., Chen L., Shen W., Zhao Y., Gui Q., Chen L., Xu B., Chen X., Guan J., Chen L., Yang K., Chai Z., Wang S. 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