Analysis of hydrogen control in a Small Modular Reactor during TLOFW severe accident

Maritza Rodríguez Gual; Marcos Coelho Maturana; Nathalia Nunes Araújo; Marcelo Ramos Martins

doi:10.15392/2319-0612.2024.2359

Autores

Maritza Rodríguez Gual Analysis, Evaluation and Risk Management Laboratory (LabRisco), Polytechnic School of the University of São Paulo https://orcid.org/0000-0002-3585-8264 (não autenticado)
Marcos Coelho Maturana Analysis, Evaluation and Risk Management Laboratory (LabRisco), Polytechnic School of the University of São Paulo https://orcid.org/0000-0003-4485-4107 (não autenticado)
Nathalia Nunes Araújo Analysis, Evaluation and Risk Management Laboratory (LabRisco), Polytechnic School of the University of São Paulo
Marcelo Ramos Martins Analysis, Evaluation and Risk Management Laboratory (LabRisco), Polytechnic School of the University of São Paulo https://orcid.org/0000-0002-4466-4437 (não autenticado)

DOI:

https://doi.org/10.15392/2319-0612.2024.2359

Palavras-chave:

Controle de hidrogênio, TLOFW, PAR, Reator Modular Pequeno, MELCOR

Resumo

Durante o acidente nuclear de Fukushima Daiichi em 2011, ocorreram explosões de hidrogênio em todas as unidades, da Unidade 1 à Unidade 3. Como consequência, uma das lições aprendidas desse acidente foi a necessidade de implementar estratégias de controle e mitigação de hidrogênio na maioria das Usinas Nucleares (NPPs). Este artigo concentra-se na incorporação de Recombinadores Autocatalíticos Passivos (PARs) durante a fase de design de um projeto de Reator Modular Pequeno de Água Pressurizada (SMR-PWR). As análises numéricas são realizadas usando o código MELCOR v. 2.2. Dois cenários são comparados: o acidente severo de Perda Total de Água de Alimentação (TLOFW) com e sem PARs. O diagrama de Saphiro é utilizado para investigar se a composição da mistura (hidrogênio, ar, vapor) é inflamável para ambos os cenários. Observou-se que a inclusão de PARs leva a uma redução no risco de hidrogênio (detonativo ou deflagrativo), pois os valores finais de concentração de hidrogênio ficam abaixo do limite de inflamabilidade. Este estudo é preliminar, e mais pesquisas são necessárias.

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