Australian news, and some related international items

Serious questions about the safety of Holtec’s canisters for nuclear wastes

Dr. Kris Singh , CEO, Holtec International, On (Not) Repairing Dry Canisters
   Dr. Kris Singh is the CEO of Holtec International He is speaking here on the subject of repairing dry canisters — or not. Event: Southern California Edison’s Community Engagement Panel Date: Oct. 14, 2014 Location: San Juan Capistrano, California ————————————————————–
– Dr. Singh states: “…It is not practical to repair a canister if it were damaged… … if that canister were to develop a leak, let’s be realistic; you have to find it, that crack, where it might be, and then find the means to repair it. You will have, in the face of millions of curies of radioactivity coming out of canister; we think it’s not a path forward… …you can easily isolate that canister in a cask that keeps it cool and basically you have provided the next confinement boundary, you’re not relying on the canister. So that is the practical way to deal with it and that’s the way we advocate for our clients.* …A canister that develops a microscopic crack (all it takes is a microscopic crack to get the release), to precisely locate it… And then if you try to repair it (remotely by welding)…the problem with that is you create a rough surface which becomes a new creation site for corrosion down the road. ASME Sec 3. Class 1 has some very significant requirements for making repairs of Class 1 structures like the canisters, so I, as a pragmatic technical solution, I don’t advocate repairing the canister.” Additional remarks by Dr. Singh and others from that meeting:
*NOTE: Problems with Dr. Singh’s solution for putting cracked canisters inside [transport] casks. · There are currently (Dec. 2014) no NRC approved Holtec specifications that address Dr. Singh’s solution of using the “Russian doll” approach of putting a cracked canister inside a [transport] cask.
· The current NRC requirements for transport casks require the interior canister to be intact for transport. The NRC requirement provides some level of redundancy in case the outer cask fails. Does this mean this leaking canister can never safely be moved? Who will allow this to be transported through their communities? What is the state of the fuel inside a cracked canister? · What is the seismic rating of a cracked canister – even if it has not yet cracked all the way through?
The NRC has no rating, but plans to allow up to a 75% crack. Currently, there is no technology that can inspect for corrosion or cracks. The NRC is giving the industry 5 years to develop it. ·
What is the cost for the transport casks that will be needed for storage? Will they be on-site? Where is this addressed? Transport casks are intended to be reusable. How and where will they be stored and secured on-site? · How will the leaking canister be handled by the Department of Energy at the receiving end of the transport?
The DOE currently requires fuel to be retrievable from the canister. A better solution would be to use casks that are not susceptible to cracks, that can be inspected and repaired and that have early warning monitoring systems that alert us before radiation leaks into the environment. For more information, go to Video by: Ace Hoffman

November 25, 2019 - Posted by | General News

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