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Re:NASA to test prototype Kilopower nuclear reactor by jhayward on Monday December 11, 2017 @02:05PM (#15899385)
An RH-72B[1] cask is a container for shipping trans-uranic nuclear waste, probably to the WIPP site.

[1] http://www.wipp.energy.gov/WIPPCommunityRelations/images/pho...

Re:NASA to test prototype Kilopower nuclear reactor by pault on Monday December 11, 2017 @02:11PM (#15899429)
That's the one! I can finally put that mystery to rest. :)