Modeling of primary water stress corrosion cracking (PWSCC) at control rod drive mechanism (CRDM) mozzles of pressurized water reactors (PWR)
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Environmenta-induced cracking of materials
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Resumo
One of the main causes of failure in pressurized water reactors (PWR) is the stress corrosion
cracking (SCC) at control rods drive mechanism (CRDM) nozzles, produced by tensile stress,
temperature, susceptible metallurgical microstructure and environmental conditions of the
primary water. Such cracks can cause accidents that reduce nuclear safety by blocking the rods
displacement at CRDM and/or leakage of primary water. This paper will present a preliminary
development of a model to predict such damage, including initiation and propagation of primary
water SCC (PWSCC). The model assumes the Pourbaix potential-pH diagram for Alloy 600 on
the typical PWR environment, primary water at high temperature. Over this diagram, the region
where the SCC submodes can occur is plotted. Submodes are determined by regions of potential
where various modes of surface material-environment interactions can occur, such as stress
corrosion, pitting, generalized corrosion or passivation. Over these regions an empiricalprobabilistic is linked to a strain rate damage model that can evaluate the time to failure and the
damage parameter, as a function of total stress at the material surface, its temperature and other
factors depending on environment-material combination and thermomechanical treatment of this
alloy.
Como referenciar
ALY, O.F.; ANDRADE, A.H.P.; MATTAR NETO, M.; SZAJNBOK, M.; TOTH, H.J. Modeling of primary water stress corrosion cracking (PWSCC) at control rod drive mechanism (CRDM) mozzles of pressurized water reactors (PWR). In: SHIPILOV, S.A. (ed.); JONES, R.H. (ed.); OLIVE, J.M. (ed.); REBAK, R.B. (ed.). Environmenta-induced cracking of materials. p. 143-151. DOI: 10.1016/b978-008044635-6.50053-4. Disponível em: http://repositorio.ipen.br/handle/123456789/23002. Acesso em: 20 Mar 2026.
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.