The wooden pieces were merely touching each other and its ends were coated in a buffer material ( often leather ).
2.
Disposal method being considered for nuclear waste :-- Waste sealed in containers designed to last at least 500 years, when radioactivity would be one-200, 000th of level when it came from reactor .-- Disposal vaults drilled out in network of tunnels 500 to 1, 000 meters ( 1, 640 to 3, 280 feet ) below below surface in geologically stable granite .-- Containers put in vaults or boreholes in floor of vaults; each container surrounded by buffer material, probably clay .-- Each room filled in and sealed with materials containing clay or cement .-- All tunnels and shafts sealed to make site " passively safe "-- not needing institutional controls to ensure long-term safety.
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