J. Phys. IV France
Volume 136, November 2006
Page(s) 3 - 11
Publié en ligne 22 décembre 2006
Corrosion and Long Term Performance of Concrete in NPP and Waste Facilities
V. L'Hostis, F. Foct and D. Féron
J. Phys. IV France 136 (2006) 3-11

DOI: 10.1051/jp4:2006136002

Studies concerning the durability of concrete vaults for intermediate level radioactive waste disposal: Electrochemical monitoring and corrosion aspects

G.S. Duffó1, 2, S.B. Farina2, E.A. Arva1, C.M. Giordano1 and C.J. Lafont1

1  Comisión Nacional de Energía Atómica, Depto. Materiales, Av. Gral. Paz 1499, (1650) San Martín, Buenos Aires, Argentina
2  Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Av. Gral. Paz 1499, (1650) San Martín, Buenos Aires, Argentina

(Published online 22 December 2006)

The Argentine Atomic Energy Commission (CNEA) is responsible of the development of a management nuclear waste disposal programme. This programme contemplates the design and construction of a facility for the final disposal of intermediate-level radioactive waste. The proposed concept is the near-surface monolithic repository similar to those in operation in El Cabril, Spain. The design of this type of repository is based on the use of multiple, independent and redundant barriers. Since the vault and cover are major components of the engineered barriers, the durability of these concrete structures is an important aspect for the facilities integrity. This work presents a laboratory and field investigation performed for the last 6 years on reinforced concrete specimens, in order to predict the service life of the intermediate level radioactive waste disposal vaults from data obtained from electrochemical techniques. On the other hand, the development of sensors that allow on-line measurements of rebar corrosion potential and corrosion current density; incoming oxygen flow that reaches the metal surface; concrete electrical resistivity and chloride concentration is shown. Those sensors, properly embedded in a new full scale vault (nowadays in construction), will allow the monitoring of the corrosion process of the steel rebars embedded in the structure.

© EDP Sciences 2006