This testimony concerned NIOSH activities related to the health and safety of workers employed at nuclear facilities. Three NIOSH studies were noted, including an evaluation in progress at the Feed Materials Production Center in Fernald, Ohio, a study of radiation exposure at the Goodyear Atomic Corporation (GAC) in Piketon, Ohio, and a study of deaths from cancer at the Portsmouth Naval Shipyard in Kittery, Maine. In the first study the union representatives at the FMPC had several health and safety issues that they wanted NIOSH to evaluate. However, the necessary information has not been forwarded by the company so that these matters could be examined. Additional requests have been made by the union at this facility in relation to reported uranium (7440611) releases from the site. NIOSH recommended that all potentially exposed workers undergo bioassay testing to determine lung burdens of uranium. Efforts along these lines were continuing. At GAC workers requested an evaluation by NIOSH particularly because of exposure to radiation from uranium-hexafluoride (7783815). Total mortality for radiation workers was significantly below that expected, including cancer deaths, even those from leukemia. Total mortality for nonradiation exposed workers indicated an increase in the number of deaths due to leukemia. In a further study a significantly increased risk for workers whose cumulative lifetime exposure was at least 1.00 rem was noted for malignancies of the trachea, bronchus, or lung.