For example, in the fall of 1997, the Nuclear Regulatory Commission's (NRC) Office of Inspector General surveyed NRC staff to obtain their views on the agency's safety culture.
The staff were never surveyed about their views of the agency's safety culture in the fall of 1997.
mnli hypothesis: The staff were never surveyed about their views of the agency's safety culture in the fall of 1997. premise: For example, in the fall of 1997, the Nuclear Regulatory Commission's (NRC) Office of Inspector General surveyed NRC staff to obtain their views on the agency's safety culture.