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96369 MODELLING THE FAILURE OF NUCLEAR WASTE CONTAINERS

Picture for 96369 MODELLING THE FAILURE OF NUCLEAR
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Product Number: 51300-96369-SG
ISBN: 96369 1996 CP
Author: D.W. Shoesmith, B.M. Ikeda, M. Kolar
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A model to predict the failure of Grade-2 titanium lmclear waste containers has been developed. Two major corrosion modes are included in the model: failure by clevice corrosion and failure by HIC. A small number containers are assumed to be defective and to fail within 50 a of emplacement. The model is probabilistic nature and each modelling parameter is assigned a range of values, resulting in a distribution of corrosion rates and failure times. The crevice corrosion rate is assumed to be dependent only on the properties of the mater used and the temperature of the vault. Crevice corrosic n is assumed to initiate rapidly on all containers and propagate indefinitely without repassivation. Failure by hydrogen-induced cracking is assumed to be inevital once the container temperature falls to <=30°C. Depending on the rate at which they are expected to cool, temperature-time profiles for individual containers are allproximated by two-step, or single-step temperature-time functions. These functions are then used with experimentally measured corrosion rates to compute the fractional failure rates and cumulative fractions of containers failed as a function of time. Approximately 97% of all ontainers are predicted to fail by crevice corrosion. Only -0.025% fail before 500 a, the time considered minimum for the containment of nuclear waste. The majority of containers fail between 1200 and 7000 a. Keywords: titanium, crevice corrosion, hydrogen-indllced cracking, nuclear waste containers, failure time modelling.
A model to predict the failure of Grade-2 titanium lmclear waste containers has been developed. Two major corrosion modes are included in the model: failure by clevice corrosion and failure by HIC. A small number containers are assumed to be defective and to fail within 50 a of emplacement. The model is probabilistic nature and each modelling parameter is assigned a range of values, resulting in a distribution of corrosion rates and failure times. The crevice corrosion rate is assumed to be dependent only on the properties of the mater used and the temperature of the vault. Crevice corrosic n is assumed to initiate rapidly on all containers and propagate indefinitely without repassivation. Failure by hydrogen-induced cracking is assumed to be inevital once the container temperature falls to <=30°C. Depending on the rate at which they are expected to cool, temperature-time profiles for individual containers are allproximated by two-step, or single-step temperature-time functions. These functions are then used with experimentally measured corrosion rates to compute the fractional failure rates and cumulative fractions of containers failed as a function of time. Approximately 97% of all ontainers are predicted to fail by crevice corrosion. Only -0.025% fail before 500 a, the time considered minimum for the containment of nuclear waste. The majority of containers fail between 1200 and 7000 a. Keywords: titanium, crevice corrosion, hydrogen-indllced cracking, nuclear waste containers, failure time modelling.
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