New Proposed Sizewell C

I would think the key issue is a tsunami. The possibility of a large Atlantic tsunami generated by the collapse of La Palma in the Canary Islands is well known; earthquake-generated tsunamis in the Atlantic are, I think, not known to be a problem. The site is protected somewhat by Ireland from open-sea Atlantic phenomena, but I don't know if anyone's done a sim to see how tsunamis get channeled into the Irish Sea and the English Channel. Somebody probably has. 

Sea level rise, even worst anticipated case, from climate change can be addressed through building dykes. Current Dutch engineering is up to the task, as far as I can tell.

You could probably even counter the effects of a La Palma-type mega-tsunami in that location by installing diversion breakwaters coupled with dykes, maybe a series of dykes, because any tsunami is going to be coming 90° across the site, from west to east, rather than full-on. But I'll leave that judgement to the hydraulic engineers.

But, of course, it has actually got to be spec'd and done. 

One ameliorating factor is that at Hinkley the key emergency resources are not sitting in the basement ............

I would think the key issue is a tsunami. The possibility of a large Atlantic tsunami generated by the collapse of La Palma in the Canary Islands is well known; earthquake-generated tsunamis in the Atlantic are, I think, not known to be a problem. The site is protected somewhat by Ireland from open-sea Atlantic phenomena, but I don't know if anyone's done a sim to see how tsunamis get channeled into the Irish Sea and the English Channel. Somebody probably has. 

Sea level rise, even worst anticipated case, from climate change can be addressed through building dykes. Current Dutch engineering is up to the task, as far as I can tell.

You could probably even counter the effects of a La Palma-type mega-tsunami in that location by installing diversion breakwaters coupled with dykes, maybe a series of dykes, because any tsunami is going to be coming 90° across the site, from west to east, rather than full-on. But I'll leave that judgement to the hydraulic engineers.

But, of course, it has actually got to be spec'd and done. 

One ameliorating factor is that at Hinkley the key emergency resources are not sitting in the basement ............