RICHLAND, Wash. (AP) — The Department of Energy is awarding nearly $77 million in incentive pay to four contractors for their work at the Hanford nuclear reservation in fiscal 2020. All earned a larger percentage of incentive pay for their work in the fiscal year that ended Sept. 30 than they did in the previous year. The Hanford site in Eastern Washington state has 56 million gallons of radioactive waste in underground tanks. The waste is left from producing about two-thirds of the nation’s plutonium for the nation’s nuclear weapons program. The awards are for Hanford’s three environmental cleanup contractors and its sitewide services contractor. Together they employ about 6,100 workers.