Progress report on the results of testing advanced conceptual design metal barrier materials under relevant environmental conditions for a tuff repository

Performance implications of waste package emplacement orientation

“…This is tme even for low flow rates since water in tercepted by the upper (nearly horizontal) segments of the borehole will tend to form pendular drops until they become large enough to fall directiy onto the WP. Since current WP design is for WPs to be supported off the bottom of the boreholes (McCright, et al, 1987), any water falling on the top (upward surface) of the WP (assuming WP temperatures are below the boiling point) will flow around at least a quarter of the WP circumference before it can fall back into the borehole. It is also likely that the water will flow around tne WP surface to the bottom of the WP and hang there until the drops become large enough to overcome the surface tension and fall to the lower perimeter of the borehole.…”

Container Materials for High-Level Nuclear Waste at the Proposed Yucca Mountain Site

“…A discussion of the chemical concerns and results of previous NNWSI/YM? test result is available [9].…”

Total system performance assessment of the proposed high level radioactive waste repository site at Genting Island, Karimunjawa, Indonesia

“…Regarding the materials for a potential HLRW container McCright has done some testing for conceptual metal barrier materials for a tuff repository [44]. Initially, 17 alloys were selected as the candidate materials using criteria such as mechanical properties, weldability, corrosion resistance, and cost.…”

“…The nominal compositions of these materials can be seen in Table 3.2 and Table 3.3. 304L and other austenistic alloys are expected to show excellent general corrosion resistance in aerated dry steam environments, in wet steam, and in vadose water [44]. The limiting factor for using 304L is the possibility of much more rapid penetration via localized or stress-assisted forms of corrosion.…”

“…However, Alloy 825 contains 2-3% Mo and is Ti-stabilized to combat localized and intergranular forms of corrosion. The copper and copper-base alloys show several advantages, co-exist thermodynamically with water (under some conditions), the driving force for corrosion and oxidation is smaller, and localized corrosion is less severe [44,45]. However, in high gamma radiation field the corrosion and oxidation rates of these materials are higher [45].…”