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I found on a forum

>it would cost $23 million to refurbish a used SRB and $12~70 million to refuel it.

A unconfirmed sources, that worked at NASA claim that Thikol employee explained to him. That reuse cost 3 time more, than a expendable SRB https://forum.nasaspaceflight.com/index.php?topic=51959.0



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