I would consider graphite moderators under the umbrella of salt facing components. High Ni alloys such as Hast-N have their own issues - mainly radiation induc

I would consider graphite moderators under the umbrella of salt facing components. High Ni alloys such as Hast-N have their own issues - mainly radiation induced Ni -> He embrittlement and tellurium embrittlement. That being said, they are very promising.