Effect of radiolysis on long-term corrosion system formed on low-alloy steels
Description
In France, for nuclear waste management, it is planned to build a storage device with a barrier system composed of steel container. Corrosion is evaluated for the safety of anoxic storage over the long term. With radiation, water radiolysis generates oxidizing and reducing species that can change the corrosion. Three aspects are developed in this thesis. The first concerns iron coupon samples experimented in carbonate deaerated water and subjected to gamma irradiation. It is shown that irradiation can increase corrosion rates within the parameters of dose. Identified crystalline phases are little changed with irradiation. Solution chemistry shows a decrease in pH with dose related to iron. Organic species are identified. The second axis is archaeological analogues irradiation with an old corrosion products layer. Structural analysis verified the phase stability with radiolysis, only the newly formed products changes. The third axis is a kinetic simulation approach. It checks the pH drop under irradiation. Taken together, these results allow us to provide new data for the anoxic corrosion under irradiation. (author)
Abstract (French)
Pour la gestion des dechets nucleaires, il est prevu de construire un dispositif: un systeme barriere compose en partie de conteneur en acier. La corrosion est evaluee pour que le stockage anoxique soit sur sur le long-terme. Avec des rayonnements, la radiolyse engendre des especes oxydantes et reductrices pouvant modifier la corrosion. Le premier axe de cette these concerne l'irradiation gamma d'echantillons de coupon de fer en eau desaeree et carbonatee. Il est montre que l'irradiation peut augmenter les vitesses de corrosion suivant les parametres de dose. Les phases identifiees sont peu modifiees avec l'irradiation. La chimie des solutions montre une baisse du pH avec la dose liee au fer. Des especes organiques sont reperees. Le deuxieme axe est l'irradiation d'analogues archeologiques avec une couche de produits de corrosion ancienne. La stabilite des phases vis-a-vis de la radiolyse est verifiee; seuls les produits neoformes changent. Le troisieme axe est une approche par simulation cinetique. Il verifie la baisse de pH sous irradiation. L'ensemble de ces resultats nous permette de proposer des donnees nouvelles pour la corrosion anoxique sous irradiation
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Additional details
Additional titles
- Original title (French)
- Effet de la radiolyse sur les systemes de corrosion anoxiques a tres long terme des alliages ferreux
Publishing Information
- Imprint Pagination
- 221 p.
- Report number
- FRCEA-TH--5496
INIS
- Country of Publication
- France
- Country of Input or Organization
- France
- INIS RN
- 45039691
- Subject category
- S12: MANAGEMENT OF RADIOACTIVE WASTES, AND NON-RADIOACTIVE WASTES FROM NUCLEAR FACILITIES;
- Resource subtype / Literary indicator
- Thesis
- Descriptors DEI
- CHEMICAL REACTION KINETICS; COMPUTERIZED SIMULATION; CORROSION; DISSOLUTION; DOSE RATES; GAMMA RADIATION; IRON; MAGNETITE; MORPHOLOGY; PH VALUE; RADIOACTIVE WASTE STORAGE; RADIOLYSIS; UNDERGROUND STORAGE
- Descriptors DEC
- CHEMICAL RADIATION EFFECTS; CHEMICAL REACTIONS; DECOMPOSITION; ELECTROMAGNETIC RADIATION; ELEMENTS; IONIZING RADIATIONS; IRON ORES; KINETICS; MANAGEMENT; METALS; MINERALS; ORES; OXIDE MINERALS; RADIATION EFFECTS; RADIATIONS; RADIOACTIVE WASTE MANAGEMENT; REACTION KINETICS; SIMULATION; STORAGE; TRANSITION ELEMENTS; WASTE MANAGEMENT; WASTE STORAGE
Optional Information
- Notes
- 130 refs.; Available from the INIS Liaison Officer for France, see the 'INIS contacts' section of the INIS-NKM website for current contact and E-mail addresses: http://www.iaea.org/inis/Contacts/; Also available from Service Commun de la Documentation de l'UPMC, 4 place Jussieu Boite courrier 192, 75252 PARIS CEDEX 05 (France)