Unlike other recently closed nuclear plants, SONGS has taken the unusual step of electing to "DECON" the plant. In Nuclear Regulatory Commission jargon, "DECON" means immediate dismantling and decontamination of a closed nuclear plant. The other option is SAFESTOR, which defers dismantling the plant for up to 60 years. Almost all the 18 plants undergoing decommissioning are using SAFESTOR. A third option under NRC rules, ENTOMB, calls for radioactive contaminants to be permanently encased on site. No nuclear licensees have yet chosen that option.