METALLIC CANISTERS UNDER CRITICISM

The experience has revealed that metallic canisters corrode much faster than assumed.

Several safety analyses take into account the corrosive attack on the outer surface of the canister only. But there is also the inner wall surface and the cladding of the fuel rods. A bundle of 800 rods has a metallic surface of 90 square meters for instance!

The failure of the metallic rod cladding prompts the release of fission products and their transport to the inner canister wall: a dangerous cocktail of different elements which accelerates the overall corrosion of the wall from the inner side.

Lessons learnt from reactor accidents should become also lessons for repositories:

  • AVOID HYDROGEN GENERATION!
  • AVOID MATERIALS SUSCEPTIBLE TO CORROSION!

The logic conclusion: AVOID METALS – USE CERAMICS INSTEAD!