Assessing the Radiolytic Hydrogen Distribution in the Steam-Gas Volume of a VVER-1000 Reactor
DOI:
https://doi.org/10.24160/1993-6982-2026-2-122-130Keywords:
radiolysis, radiolytic hydrogen, reactor, ignition threshold, computer codeAbstract
The article addresses matters concerned with computational modeling of the release and accumulation of radiolytic hydrogen in the reactor pressure vessel steam-gas volume during scheduled preventive maintenance outage. The amount of hydrogen released from the coolant surface is numerically evaluated, and the mass transfer of hydrogen and oxygen coming from the depressurized claddings of the control and protection system rods is simulated. Based on the obtained numerical evaluation and simulation results, a safety analysis is carried out from the viewpoint of view of generating explosive hydrogen-oxygen mixture concentrations. Proceeding from the calculations performed, the time taken for hydrogen and oxygen to accumulate in the reactor volume to concentrations exceeding the hydrogen-oxygen mixture ignition threshold has been estimated. The proposed calculation procedure and the obtained estimates can be used for carrying out further calculations and analysis in substantiating measures taken to remove hydrogen from the reactor pressure vessel volume to ensure its safe operation.
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Для цитирования: Воробьева С.Ю., Воробьев Ю.Б., Верховская А.О., Карнаухов В.Е., Седов М.К., Уртенов Д.С., Четвериков А.Е. Оценка распределения радиолитического водорода в парогазовом объеме реактора ВВЭР-1000 // Вестник МЭИ. 2026. № 2. С. 122—130. DOI: 10.24160/1993-6982-2026-2-122-130
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Конфликт интересов: авторы заявляют об отсутствии конфликта интересов
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For citation: Vorobyeva S.Yu., Vorobyev Yu.B., Verkhovskaya A.O., Karnaukhov V.E., Sedov M.K., Urtenov D.S., Chetverikov A.E. Assessing the Radiolytic Hydrogen Distribution in the Steam-Gas Volume of a VVER-1000 Reactor. Bulletin of MPEI. 2026;2:122—130. (in Russian). DOI: 10.24160/1993-6982-2026-2-122-130
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Conflict of interests: the authors declare no conflict of interest
