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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">10.52676/1729-7885-2025-4-214-223</article-id><article-id custom-type="elpub" pub-id-type="custom">nuc-953</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>ИССЛЕДОВАНИЕ ДИНАМИКИ ПАРАМЕТРОВ АКТИВНОЙ ЗОНЫ EPR ПРИ РАБОТЕ НА МОЩНОСТИ</article-title><trans-title-group xml:lang="en"><trans-title>ANALYSIS OF CORE PARAMETER DYNAMICS IN EPR DURING POWER OPERATION</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0009-0001-6717-1598</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Мухамедиев</surname><given-names>А. К.</given-names></name><name name-style="western" xml:lang="en"><surname>Mukhamediyev</surname><given-names>A. K.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Курчатов</p></bio><bio xml:lang="en"><p>Kurchatov</p></bio><email xlink:type="simple">mukhamediev@nnc.kz</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Прозорова</surname><given-names>И. В.</given-names></name><name name-style="western" xml:lang="en"><surname>Prozorova</surname><given-names>I. V.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Курчатов</p></bio><bio xml:lang="en"><p>Kurchatov</p></bio><email xlink:type="simple">prozorova@nnc.kz</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Прозоров</surname><given-names>А. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Prozorov</surname><given-names>A. A.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Курчатов</p></bio><bio xml:lang="en"><p>Kurchatov</p></bio><email xlink:type="simple">paa@nnc.kz</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Попов</surname><given-names>Ю. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Popov</surname><given-names>Yu. A.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Курчатов</p></bio><bio xml:lang="en"><p>Kurchatov</p></bio><email xlink:type="simple">popov@nnc.kz</email><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru">Филиал «Институт атомной энергии» РГП НЯЦ РК<country>Казахстан</country></aff><aff xml:lang="en">Branch “Institute of Atomic Energy” RSE NNC RK<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>214</fpage><lpage>223</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Мухамедиев А.К., Прозорова И.В., Прозоров А.А., Попов Ю.А., 2025</copyright-statement><copyright-year>2025</copyright-year><copyright-holder xml:lang="ru">Мухамедиев А.К., Прозорова И.В., Прозоров А.А., Попов Ю.А.</copyright-holder><copyright-holder xml:lang="en">Mukhamediyev A.K., Prozorova I.V., Prozorov A.A., Popov Y.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/953">https://journals.nnc.kz/jour/article/view/953</self-uri><abstract><p>Актуальность работы связана с анализом активной зоны реактора типа EPR (European Pressurized Reactor) и описанию механизмов управления реактивностью на всех стадиях топливной кампании. Актуальность работы подчёркивается важностью верификации и валидации моделей, описывающих поведение активной зоны в динамике, для обоснования безопасности реакторов нового поколения. Отличительной особенностью работы является моделирование процессов, происходящих в активной зоне реактора поколения III+ с использованием расчетов методом Монте-Карло в программе MCNP. В ходе исследований рассмотрены как активные (регулируемые) параметры реактивности – глубина ввода управляющих стержней и концентрация борной кислоты, так и пассивные – выгорание поглотителей (гадолиния) и накопление продуктов деления. Рассмотрена группа продуктов деления, которая описывает эффекты отравления и шлакования АЗ. Выполнена сравнительная оценка параметров, влияющих на реактивность.</p><p>Результаты исследования подтверждают высокую эффективность комплексной системы управления реактивностью в реакторах EPR и демонстрируют необходимость интегрированного подхода к анализу нейтронно-физических характеристик активной зоны, учитывающего как активные, так и пассивные механизмы изменения реактивности. Результаты также будут полезны для анализа и улучшения топливных кампаний как российских ВВЭР, так и зарубежных PWR-реакторов. </p></abstract><trans-abstract xml:lang="en"><p>The relevance of this study is associated with the analysis of the reactor core of the EPR (European Pressurized Reactor) and the description of reactivity control mechanisms at all stages of the fuel cycle. The research considers both active (controllable) reactivity parameters such as control rod insertion depth and boric acid concentration, and passive parameters, including the burnup of burnable absorbers (gadolinium) and the accumulation of fission products. A comparative assessment of the parameters affecting reactivity has been performed.</p><p>The results of the study confirm the high efficiency of the comprehensive reactivity control system in EPRs and demonstrate the necessity of an integrated approach to the analysis of the neutronic characteristics of the reactor core, taking into account both active and passive mechanisms of reactivity change.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>реактор EPR</kwd><kwd>реактивность</kwd><kwd>поглотитель</kwd><kwd>продукты деления</kwd><kwd>keff</kwd></kwd-group><kwd-group xml:lang="en"><kwd>EPR reactor</kwd><kwd>reactivity</kwd><kwd>absorbers</kwd><kwd>fission products</kwd><kwd>kef</kwd><kwd>MCNP</kwd></kwd-group><funding-group xml:lang="ru"><funding-statement>Работа выполнена при финансовой поддержке Агентства Республики Казахстан по атомной энергии в рамках научно-технической программы BR24792713 «Развитие атомной энергетики в Республике Казахстан».</funding-statement></funding-group></article-meta></front><back><ref-list><title>References</title><ref id="cit1"><label>1</label><citation-alternatives><mixed-citation xml:lang="ru">U.S. EPR Fuel Assembly Mechanical Design, AREVA NP Inc., May 2013</mixed-citation><mixed-citation xml:lang="en">U.S. EPR Fuel Assembly Mechanical Design, AREVA NP Inc., May 2013</mixed-citation></citation-alternatives></ref><ref id="cit2"><label>2</label><citation-alternatives><mixed-citation xml:lang="ru">Recommendations for Addressing Axial Burnup in PWR Burnup Credit Analyses, Oak Ridge National Laboratory, MARCII 2003</mixed-citation><mixed-citation xml:lang="en">Recommendations for Addressing Axial Burnup in PWR Burnup Credit Analyses, Oak Ridge National Laboratory, MARCII 2003</mixed-citation></citation-alternatives></ref><ref id="cit3"><label>3</label><citation-alternatives><mixed-citation xml:lang="ru">Научно-деловой портал «Атомная энергия 2.0» (2008-2025) https://www.atomic-energy.ru/news/2021/06/15</mixed-citation><mixed-citation xml:lang="en">Научно-деловой портал «Атомная энергия 2.0» (2008-2025) https://www.atomic-energy.ru/news/2021/06/15</mixed-citation></citation-alternatives></ref><ref id="cit4"><label>4</label><citation-alternatives><mixed-citation xml:lang="ru">https://leg.co.ua/stati/pervyy-v-evrope-epr-dostig-pervoy-kritichnosti.html</mixed-citation><mixed-citation xml:lang="en">https://leg.co.ua/stati/pervyy-v-evrope-epr-dostig-pervoy-kritichnosti.html</mixed-citation></citation-alternatives></ref><ref id="cit5"><label>5</label><citation-alternatives><mixed-citation xml:lang="ru">The Physics of Nuclear Reactors, Serge Marguet, 2017, https://doi.org/10.1007/978-3-319-59560-3</mixed-citation><mixed-citation xml:lang="en">The Physics of Nuclear Reactors, Serge Marguet, 2017, https://doi.org/10.1007/978-3-319-59560-3</mixed-citation></citation-alternatives></ref><ref id="cit6"><label>6</label><citation-alternatives><mixed-citation xml:lang="ru">Design of the Reactor Core for Nuclear Power Plants. – Vienna: International Atomic Energy Agency, 2020. – 75 p. – (IAEA Safety Standards Series; No. SSG-52).</mixed-citation><mixed-citation xml:lang="en">Design of the Reactor Core for Nuclear Power Plants. – Vienna: International Atomic Energy Agency, 2020. – 75 p. – (IAEA Safety Standards Series; No. SSG-52).</mixed-citation></citation-alternatives></ref><ref id="cit7"><label>7</label><citation-alternatives><mixed-citation xml:lang="ru">MCNP — A General Monte Carlo N-Particle Transport Code. 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