ОЦЕНКА ВЫДЕЛЕНИЯ ИОНОВ ТРИТИЯ, ОБРАЗУЮЩИХСЯ В ЯДЕРНОЙ РЕАКЦИИ ⁶Li(n, α)T ИЗ ПРИПОВЕРХНОСТНОГО СЛОЯ ЛИТИЕВОЙ КЕРАМИКИ В УСЛОВИЯХ РЕАКТОРНОГО ОБЛУЧЕНИЯ

Представлены аналитические результаты по оценке стационарного потока ионов трития, выделяющихся из керамик на основе лития Li₂TiO₃ различного обогащения в условиях реакторного облучения на реакторе ВВР-К. Нейтронно-транспортные расчёты выполнены в MCNP6 с использованием библиотеки ENDF/B-VII.1 и сопоставлены с in-situ газовыделением, зарегистрированным при температуре керамик 650 ℃ и потоке тепловых нейтронов 5·10¹³ н/(см² с). Разработанная расчетная модель не содержит подгоночных коэффициентов и учитывает длину пробега ионов, эффект самоэкранирования в керамике (δ = 0,32) и потери на рекомбинацию. Полученные значения потока T⁺ из керамик различного изотопного состава составляют 3,07·10⁻¹³ до 1,96·10⁻¹² моль/с. Максимальное снижение потока за счёт самоэкранирования в керамике не превышает 32%. Расхождение между расчётом и экспериментом по компоненте HT не превышает 15%, что подтверждает адекватность подхода. Результаты имеют практическую значимость при оценке баланса трития в бланкетах термоядерных реакторов (ТЯР) и позволяют оптимизировать состав и размер керамических пэбблов с учётом безактивационного газовыделения трития. 

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