Heat transfer mode in the core of the Angra 2 nuclear power plant during small break loca obtained with RELAP5 code
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2013
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REUNIÃO DE TRABALHO SOBRE FÍSICA NUCLEAR NO BRASIL, 36.
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This work aims to identify the heat transfer mode with RELAP5/MOD3.2.gama code in the core of Angra 2
facility. The postulate accident is the Loss of Coolant Accident (LOCA) in the primary circuit for Small Break
(SB), which is described in Chapter 15 of the Final Safety Analysis Report of Angra 2 (FSAR). The accident
consists basically of the total break of the cold leg of Angra 2 facility. The rupture area considered was 380 cm2,
which represents 100% of the primary circuit pipe °ow area. The Emergency Core Cooling System (ECCS)
e±ciency is also tested in this accident. In this simulation, failure and repair criteria are adopted for the ECCS
components in order to verify the system operation e±ciency - preserving the integrity of the reactor core and
guaranteeing its cooling - as expected by the project design. SBLOCA accidents are characterized by a fast
blowdown in the primary circuit to values that activate the low pressure injection system followed by the water
injection from the accumulators. The thermal-hydraulic processes inherent to the accident phenomenon, such
as hot leg vaporization and consequently core vaporization cause inappropriate °ow distribution in the reactor
core that can lead to reduction in the core liquid level, up to the point that the ECCS is able to re°ood it.
This work shows the mode numbers and the wall convection heat transfer used in the RELAP5 code that were
accessed during the execution of the program. The results showed that the numerical simulations with RELAP5
were satisfactory and that the ECCS worked e±ciently, guaranteeing the integrity of the reactor core.
Como referenciar
SABUNDJIAN, GAIANE; BELCHIOR JUNIOR, ANTONIO; CONTI, THADEU das N.; ROCHA, MARCELO da S.; ANDRADE, DELVONEI A. de; TORRES, WALMIR M.; MACEDO, LUIZ A.; UMBEHAUN, PEDRO E.; MESQUITA, ROBERTO N. de; LIMA, ANA C. de S. Heat transfer mode in the core of the Angra 2 nuclear power plant during small break loca obtained with RELAP5 code. In: REUNIÃO DE TRABALHO SOBRE FÍSICA NUCLEAR NO BRASIL, 36., 1-5 de Setembro, 2013, São Sebastião, SP. Resumo... São Paulo: Sociedade Brasileira de Física, 2013. p. 1-1. Disponível em: http://repositorio.ipen.br/handle/123456789/27635. Acesso em: 30 Dec 2025.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.