C. Sean Brossia

Corrosion Behavior of Waste Package and Drip Shield Materials

Abstract The susceptibility to various forms of corrosion that could be experienced by the alloys considered by the U.S. Department of Energy for the waste package and drip shield, the principal components of the engineered barrier system for the proposed repository at Yucca Mountain, is evaluated on the basis of experimental studies conducted at the Center for Nuclear Waste Regulatory Analyses. Environmental, metallurgical, and mechanical conditions for the occurrence of uniform corrosion, localized corrosion, and environmentally assisted cracking of Alloy 22 (58Ni–22Cr–13Mo–3W–4Fe), the preferred material for the outer container, and Titanium-Grade 7 (Ti–0.15 Pd), the alloy proposed for the drip shield, are reported.

A Mobile Sensor System to Detect Water Hold-Up Locations and Internal Corrosion in Pipelines

This paper presents an evaluation of the thin film corrosion sensors that could be used in combination with a mobile, wireless platform to detect internal corrosion along a pipeline. The iron-copper, thin film interdigitated sensor was found to be appropriate for detecting the presence of corrosive conditions within the pipe. The sensor reading using DC resistance measurement method reflected the corrosivity of a number of electrolytes and was able to determine the corrosion rate of iron in these environments. The sensor readings were reproducible. The sensor was able to distinguish between bulk aqueous solution and condensed moisture film. The sensor response was relatively rapid (within 60 s), thus permitting it to be used as a transient, retrievable sensor. The sensor life in the presence of acid gases, CO2 and H2 S, was relatively short (less than a week). The sensor readings were only slightly dependent on sensor geometry.Copyright