charleston s.c. south carolina sue u.s. government recover 100 million fin say department energy owe state fail remove one metric ton plutonium store state attorney general alan wilson say tuesday lawsuit file monday state large case ever u.s. government wilson say news release congress approve fin million per day first 100 days year 2021 begin last year weapons-grade plutonium remove savannah river site state border georgia attorney general office say lawsuit seek money owe year state still work claim 2016 fin well wilson say federal government break obligations leave south carolina permanent dump grind weapons-grade plutonium wilson republican say complaint department energy spokeswoman say agency comment pending litigation build 1950s u.s.-owned savannah river site process store nuclear materials support national defense u.s. nuclear nonproliferation efforts u.s. treaty russia 2000 require country dispose 34 metric tons weapons-grade plutonium leave cold war unite state begin build mix oxide fuel fabrication facility know mox project savannah river site dispose weapons-grade plutonium mix uranium form safe fuel pellets use commercial nuclear reactors project years overdue billions budget technology new fuel fabrication fully develop russian president vladimir putin last october pull plutonium pact amid rise tensions ukraine syria trump administration propose fiscal year 2018 budget scrap project pursue dilute plutonium dispose underground alternative call obama administration south carolina seek 100 million u.s. plutonium removal