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Not paywalled for me, but here you go-
The information you provided was not sufficient so I googled
The suspect drums contain nitrates and cellulose, which are thought to have reacted to cause the explosion in February
It was low level waste mostly americanum dissolved into the mixture of nitrates and cellulose. The barrel did not explode as much as the lid popped off.
Waste from nuclear weapons is not the same as waste from commercial nuclear power plants.
WIPP is for low level transuranic waste from DOE projects, just FYI. Not super toxic stuff. They ship it in these super tough containers that they test by dropping on a spike and putting in a furnace. Wild to watch.