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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">glonucsec</journal-id><journal-title-group><journal-title xml:lang="ru">Глобальная ядерная безопасность</journal-title><trans-title-group xml:lang="en"><trans-title>Global Nuclear Safety</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">2305-414X</issn><issn pub-type="epub">2499-9733</issn><publisher><publisher-name>National Research Nuclear University "MEPhI"</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.26583/gns-2026-03-03</article-id><article-id custom-type="edn" pub-id-type="custom">FTDBEN</article-id><article-id custom-type="elpub" pub-id-type="custom">glonucsec-523</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>ЯДЕРНАЯ, РАДИАЦИОННАЯ И ЭКОЛОГИЧЕСКАЯ БЕЗОПАСНОСТЬ</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>NUCLEAR, RADIATION AND ENVIRONMENTAL SAFETY</subject></subj-group></article-categories><title-group><article-title>Кросс-верификация расчетного моделирования критических экспериментов БФС-97 и анализ влияния технологических и константных неопределенностей на коэффициент размножения</article-title><trans-title-group xml:lang="en"><trans-title>Cross-verification of computational modeling of BFS-97 critical experiments and impact analysis of technological and nuclear-data uncertainties on the multiplication factor</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-9540-3456</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Буркеев</surname><given-names>М. З.</given-names></name><name name-style="western" xml:lang="en"><surname>Burkeev</surname><given-names>M. Z.</given-names></name></name-alternatives><bio xml:lang="ru"><p>специалист, отделение ядерной физики и технологий</p></bio><bio xml:lang="en"><p>specialist, Department of Nuclear Physics and Technologies</p></bio><email xlink:type="simple">perevozdd@mail.ru</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-2048-0828</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Внуков</surname><given-names>Р. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Vnukov</surname><given-names>R. A.</given-names></name></name-alternatives><bio xml:lang="ru"><p>старший преподаватель отделения ядерной физики и технологий</p></bio><bio xml:lang="en"><p>Senior Lecturer, Department of Nuclear Physics and Technologies</p></bio><email xlink:type="simple">vnukovra@oiate.ru</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0001-8905-1995</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Колесов</surname><given-names>В. В.</given-names></name><name name-style="western" xml:lang="en"><surname>Kolesov</surname><given-names>V. V.</given-names></name></name-alternatives><bio xml:lang="ru"><p>кандидат физико-математических наук, доцент отделения ядерной физики и технологий</p></bio><bio xml:lang="en"><p>Cand. Sci. (Phys.-Math.), Associate Professor, Department of Nuclear Physics and Technologies</p></bio><email xlink:type="simple">valeri-kolesov@yandex.ru</email><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Обнинский институт атомной энергетики – филиал Национального исследовательского ядерного университета «МИФИ»</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Obninsk Institute for Nuclear Power Engineering the Branch of National Research Nuclear University «MEPhI»</institution><country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2026</year></pub-date><pub-date pub-type="epub"><day>01</day><month>10</month><year>2026</year></pub-date><volume>16</volume><issue>3</issue><fpage>27</fpage><lpage>37</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Буркеев М.З., Внуков Р.А., Колесов В.В., 2026</copyright-statement><copyright-year>2026</copyright-year><copyright-holder xml:lang="ru">Буркеев М.З., Внуков Р.А., Колесов В.В.</copyright-holder><copyright-holder xml:lang="en">Burkeev M.Z., Vnukov R.A., Kolesov V.V.</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://glonucsec.elpub.ru/jour/article/view/523">https://glonucsec.elpub.ru/jour/article/view/523</self-uri><abstract><p>Выполнена кросс-верификация расчетного моделирования критических сборок БФС-97 и оценено влияние технологических неопределенностей и выбора библиотеки ядерных данных на эффективный коэффициент размножения. Для конфигураций БФС-97-1–БФС-97-4 построены гетерогенные модели в коде Serpent 2 с библиотеками JEFF-3.1.1, JEFF-3.3 и ENDF/B-VII.1. Рассчитаны абсолютные значения keff, температурные эффекты реактивности и межбиблиотечные сдвиги. Температурный отклик сопоставлен с результатами расчетов, выполненных детерминистическим кодом TRIGEX, а причины различий между библиотеками исследованы однопараметрической заменой сечений отдельных нуклидов. В качестве критерия воспроизведения использована полная технологическая неопределенность эталонного эксперимента. Для сборок БФС-97 полная неопределенность keff составляет 0,26-0,31 %, причем основной вклад вносит геометрия. Температурный эффект при изменении температуры от 314 до 329 K возрастает по модулю примерно от 18 pcm для БФС-97-1 до 63-64 pcm для БФС-97-3 и БФС-97-4. Для БФС-97-3 и БФС-97-4 результаты Serpent согласуются с оценками TRIGEX в пределах 2-3σ(Δρ); для БФС-97-1 и БФС-97-2 совпадают знак и порядок величины эффекта, однако расхождение превышает 3σ(Δρ). Для конфигурации БФС-97-4 межбиблиотечный разброс абсолютного keff достигает 0,2-0,9 % и становится сопоставимым с технологической неопределенностью эксперимента или превышает ее. Нуклидная декомпозиция показывает, что основной вклад в расхождения дают сечения 238U и 239Pu. Установлено, что дифференциальный температурный эффект значительно устойчивее к выбору библиотеки, чем абсолютная критичность. Воспроизводимость расчета для валидационных задач следует оценивать относительно полной неопределенности эталонного эксперимента, а не только относительно статистической погрешности метода Монте-Карло.</p></abstract><trans-abstract xml:lang="en"><p>Cross-verification of computational models of the BFS-97 critical assemblies is performed, and the effects of technological uncertainties and nuclear data library selection on the effective multiplication factor are assessed. Heterogeneous Serpent 2 models are developed for the BFS-97-1 through BFS-97-4 configurations using the JEFF-3.1.1, JEFF-3.3, and ENDF/B-VII.1 libraries. Absolute keff values, temperature reactivity effects, and inter-library shifts are calculated. The temperature response is compared with results obtained using the deterministic TRIGEX code with the BNAB-93 multigroup constants, while the origins of library-dependent differences are examined by one-at-a-time replacement of individual nuclide cross sections. The total technological uncertainty of the benchmark experiment is used as the reproducibility criterion. The calculations show that the total keff uncertainty for the BFS-97 assemblies is 0.26-0.31 %, with geometry providing the dominant contribution. As temperature increase from 314 to 329 K, the magnitude of the reactivity effect rises from approximately 18 pcm for BFS-97-1 to 63–64 pcm for BFS-97-3 and BFS-97-4. The Serpent and TRIGEX results agree within 2-3σ(Δρ) for BFS-97-3 and BFS-97-4; the sign and order of magnitude agree, but the difference exceeds 3σ(Δρ) for BFS-97-1 and BFS-97-2., the inter-library spread in absolute keff reaches 0.2-0.9 %, making it comparable to or greater than the technological uncertainty of the experiment for BFS-97-4. Nuclide decomposition identifies the 238U and 239Pu cross sections as the main contributors to the discrepancies. It is found that the differential temperature effect is substantially less sensitive to the library choice than absolute criticality. Calculation reproducibility should therefore be judged against the complete uncertainty of the benchmark experiment rather than against the Monte Carlo statistical error alone.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>БФС-97</kwd><kwd>Serpent</kwd><kwd>неопределенности</kwd><kwd>технологические погрешности</kwd><kwd>ядерные данные</kwd><kwd>JEFF</kwd><kwd>ENDF</kwd><kwd>кросс-верификация</kwd><kwd>чувствительность</kwd><kwd>keff</kwd></kwd-group><kwd-group xml:lang="en"><kwd>BFS-97</kwd><kwd>Serpent</kwd><kwd>uncertainties</kwd><kwd>technological uncertainties</kwd><kwd>nuclear data</kwd><kwd>JEFF</kwd><kwd>ENDF</kwd><kwd>cross-verification</kwd><kwd>sensitivity</kwd><kwd>keff</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">Dean V.F., Blackwood L.G. ICSBEP Guide to the Expression of Uncertainties for Critical Experiments. Revision 5. 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