Fuel with advanced burnable absorbers design for the BNPP reactor core: Combined gadolinia and erbia

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عنوان دوره: اولین دوره بین المللی و بیست و هشتمین دوره ملی (1400)
The development of integrated burnable absorbers and their changes is undeniable in the world and Bushehr reactor will be no exception to this rule. The work coincides with the operational changes modifications of Bushehr nuclear power plant (BNPP) in the near future. In the proposed core, gadolinia provides the bulk of the hold-down, with no penalty on cycle length, while the erbia is adjusted to obtain the desired margin. Neutronic parameters include variations of effective multiplication factor versus burnup, reactivity swing, power peaking distribution, critical boron concentration and fuel cycle length. The cycle length of the proposed core is 366 days, which is about 74 days longer than the BNPP cycle length. In addition, the results were compared with the Russian proposed core, TVS-2M. The main extra cost is related to the IBA pins numbers which is less in the mentioned core (420 pins) than the TVS-2M core (666 pins).
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