Corrosion influenced by biofilms during wet nuclear waste storage

The objective of this paper is to give a short overview of how the bacteria, that may influence the corrosion behaviour of metals and alloys, are taken into account in the French concept of geological repository. It is important to underline that microbial induced corrosion is not a new corrosion phenomena but the presence of bacteria may modify (increase or decrease) anodic or cathodic corrosion reactions. In aerobic conditions, high corrosion rates may be obtained due to the biooxidation of pyrites. Under anaerobic conditions (longer period), bacteria may have negative (localised corrosion) or positive (consumption of hydrogen) effects. The mixed conditions (with and without oxygen) may be the most dangerous period for localised corrosion of metals and alloys due to the coupling and galvanic corrosion phenomena enhanced by aerobic and anaerobic bacteria. The first conclusions lead to consider that MIC is a 'short term' issue rather than a long term one.

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“…Therefore, it is unlikely that radiation plays a significant role on the bacterial activity at the surface of the containers. 14 …”

Section: Aerobic Conditionsmentioning

confidence: 99%

Microbial induced corrosion in French concept of nuclear waste underground disposal

Féron

Crusset²

2014

Corrosion Engineering, Science and Technology

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“…Contamination was also found in nuclear waste repositories. 6,7) For materials scientists and engineers, corrosion influenced by microorganisms are known as MIC (Microbially Influenced Corrosion or Microbially Induced Corrosion). Sulfate-reducing bacteria, sulfur-oxidizing bacteria and manganese-bacteria are well known bacteria associated with MIC.…”

Section: Introductionmentioning

confidence: 99%

Antibacterial Properties of Metallic Elements for Alloying Evaluated with Application of JIS Z 2801:2000

et al. 2008

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Antibacterial properties of 21 metallic elements used as alloying elements (Al, Si, Ti, V, Cr, Mn, Co, Ni, Cu, Zn, Zr, Nb, Mo, Pd, Ag, Sn, Ta, W, Pb, Au, Pt) was studied. Escherichia coli (Gram-negative bacteria) and Staphylococcus aureus subsp. aureus (Gram-positive bacteria) were used as model bacteria. The film attachment method was adopted for evaluation of antibacterial activity, and Japan industrial standard Z 2801:2000 was applied as the criterion for evaluate antimicrobial abilities of samples. Silver and Cu showed strong bactericidal effects as expected, and following them Co, Ni and Al were moderately toxic. Physiological effects of metals depended on the specie of bacteria. For example, Ni decreased the total viable count of E. coli to 10 cfu/mL in 4 h, while it took 24 h to decrease the total viable count of S. aureus. By judgment following to JIS Z 2801:2000, Pt and Pb were effective only for E. coli, while V and Zr were only for S. aureus. Gold was not toxic even though Au 3ϩ had been reported as strong toxic. Also Mo showed antibacterial effects which can be resulting from decrease in pH of the bacteria suspension.KEY WORDS: metallic elements; bacteria; bactericide; film attachment method; JIS Z 2801:2000. 1299

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“…Figure 8.14 shows approximate times for each of these factors, from which it is apparent that biofilm formation will not occur on container surfaces of high radioactive waste for 10 000 years, and quite likely for much longer. Although the main factors which can influence the microbial corrosion of nuclear waste storage are identical from one repository to the next, some specific studies have been undertaken in different countries, such as in France , Hungary (Diosi et al, 2003), Sweden (Pedersen, 1999) and the USA (lian et al, 1999). The differences concern mainly the bacteria found on site.…”

Section: Microbial Corrosion Of Nuclear Waste Containersmentioning

confidence: 99%

Microbiologically influenced corrosion (MIC) in nuclear power plant systems and components

Tribollet

2012

Nuclear Corrosion Science and Engineering

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Corrosion influenced by biofilms during wet nuclear waste storage

Cited by 27 publications

References 9 publications

Microbial induced corrosion in French concept of nuclear waste underground disposal

Microbial induced corrosion in French concept of nuclear waste underground disposal

Antibacterial Properties of Metallic Elements for Alloying Evaluated with Application of JIS Z 2801:2000

Microbiologically influenced corrosion (MIC) in nuclear power plant systems and components

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