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Spent nuclear fuel (SNF) is currently stored in stainless steel dry storage canisters (DSCs) contained within concrete cask systems with passive ambient air cooling. These systems are emplaced, either horizontally or vertically, at independent spent fuel storage installations (ISFSIs), located at utility reactor sites. The ambient air introduces moisture, aerosolized salt particles, and dust to the canister surfaces. The composition of the aerosols depends on geographical factors, such as proximity to the ocean,industrial area, rural areas, and transportation corridors that use road salt for winterization.
Spent nuclear fuel (SNF) is currently stored in dry storage canisters (DSCs) at various reactor sites awaiting final disposal in a future repository site. Many DSCs are made from welded Type 304/304L stainless steel (UNS S30400/S30403) and then placed inside a concrete cask system with passive atmospheric air cooling. The most likely long-term degradation that may result in a breach of the DSC’s containment system is chloride induced stress corrosion cracking (CISCC). A precursor to CISCC is localized corrosion in the form of pit initiation and propagation. This paper describes a model to quantify the time-based occurrence of CISCC on SNF DSCs that includes: weld residual stress, hourly time histories for site weather data, canister aerosol deposition density, SNF decay heat, canister surface temperature, deliquescence of mixed salts, droplet condensation, coalescence, and evaporation, dissolved species concentrations, pit initiation, growth, and repassivation, a criterion for pit-to-crack transition, and strain rate-based SCC crack growth. A supplemental and repeatable (for other designs and applications) experimental study to calibrate the model components is presented. The integrated model incorporates input parameter uncertainties to compute a probabilistic estimate of remaining life.
Tetrakis(hydroxymethyl)-phosphonium Sulfate (THPS) is a very common active ingredient in oil and gas biocides. While product labels provide broad guidelines application dosing the lowest effective dose of THPS is difficult to determine. Site water chemistry and bacteria biology variability will affect the dose need to achieve the desired level of bacteria population control. For these reasons biocide dose response studies are commonly conducted on solutions containing bacteria to determine the effect of treatments before application.
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Biomass, as a renewable energy source, can be converted into bio-oil (BO) via thermochemical conversion pathways. Among them, fast pyrolysis is the most common and the only industrially applied approach to convert dry biomass into BO. There are many advantages of using BO to replace traditional fossil fuels. For example, the amount of CO2 generated from biofuel combustion is close to that absorbed in raw biomass growth, leading to a net-zero carbon emission from energy production. BO combustion generates lower emissions of SOx and NOx compared to conventional fossil fuels.
MIC is a major problem in many industrial sectors, especially in the oil and gas industry. It is widely believed that almost 20% of all corrosion costs can be attributed to MIC. The shale gas and oil industry suffers from mostly MIC rather conventional abiotic CO2/H2S corrosion. Very severe MIC with fast failures are seen in field operations with very harsh operating conditions such as high salinity and nutrient-rich water, including treated municipal wastewater that promotes microbial growth. In some situations, titanium and plastic pipes are used to cope with MIC.