SALT LAKE CITY — Utah's Radiation Control Board is moving forward with efforts to require a company that wants to dispose of depleted uranium in the state to first submit a report confirming that additional safeguards will work.

The board voted Tuesday to develop new rules requiring EnergySolutions Inc. to complete a "site performance assessment" before additional depleted uranium comes to Utah.

The rule-making process is expected to take up to 120 days.

Nearly 15,000 drums of the low-level radioactive waste were slated to start arriving in December at the company's facility about 70 miles west of Salt Lake City.

But the company doesn't expect the updated assessment to be done until December 2010.