To establish eligibility for benefits for chronic silicosis under Part B of EEOICPA, an employee or his or her survivor must show that:

(a) The employee is a civilian DOE employee, or a civilian DOE contractor employee, who was present for a number of workdays aggregating at least 250 workdays during the mining of tunnels at a DOE facility (as defined in § 30.5(y)) located in Nevada or Alaska for tests or experiments related to an atomic weapon, and has been diagnosed with chronic silicosis (as defined in § 30.5(k)); or

(b) The employee has been diagnosed with an injury, illness, impairment or disease that arose as a consequence of the accepted chronic silicosis.