As per practice, the cat litter with silicates is used for stabilization of the volatiles in the nuclear waste to prevent reaction with others. However changing the cat litter from clay based to organic based (corn/wheat) is suspected to have caused the exothermic reaction, failure of containment of the drum and radiation exposure.
We have to know many things before we do something. Definitely, this incident in New Mexico nuclear waste isolation plant is a clear case study for all of us to learn.
http://www.theverge.com/2015/3/27/8299325/kitty-litter-nuclear-waste-accident-wipp
http://www.npr.org/blogs/thetwo-way/2014/05/23/315279895/organic-kitty-litter-chief-suspect-in-nuclear-waste-accident
http://www.santafenewmexican.com/special_reports/from_lanl_to_leak/lanl-officials-downplayed-waste-s-dangers-even-after-leak/article_54d7f3d2-8c99-5793-8c17-c4bdb0b72ef1.html?mode=jqm
http://www.currentargus.com/carlsbad-news/ci_25750452/doe-examining-possibility-kitty-litter-contributed-radiation-leak
http://www.livescience.com/50286-kitty-litter-to-blame-for-nuclear-waste-leak.html
2 page report:
http://energy.gov/sites/prod/files/2015/03/f20/TAT_Fact_sheet%2032615%20FINAL.pdf
277 page report on the incident:
http://energy.gov/sites/prod/files/2015/03/f20/MARCH%202015%20-%20FINAL%20TECHNICAL%20ASSESSMENT%20TEAM%20REPORT.pdf