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The safe and reliable operation of nuclear power plants does not depend only on technical excellence, but also it depends on people and on the organization. For this reason, the importance of organizational factors in causal mechanisms of accidents has been recognized by a number of research organizations in Europe, USA and Japan. Deficiencies in these factors reveal weaknesses in the organization's safety culture. A primary concern in evaluating a safety culture is to ensure that research instruments are valid and reliable. In the areas of occupational health and safety there are series of tools to evaluate the safety culture that present studies of its psychometric properties (reliability and validity), but very few of these qualities in the nuclear area. In the specific case of Brazil, none of these tools exist. Therefore, the main objective of this study is to develop a model to assess the safety culture in nuclear facilities with valid and reliable measures. The survey instrument was developed in accordance with the psychometric principles established for quantitative research and thus were held to analyze the reliability and validation of content, face and construct. The instrument was applied in the research institutes of the Brazilian Nuclear Energy National Commission (CNEN), yielding a total of 226 completed questionnaires answered. The survey results made it possible to characterize demographically the respondents and identify many strengthened aspects, but also some weaknesses in the safety culture of the evaluated institutions. The instrument showed good evidence of reliability with Cronbach's alpha coefficient 0,95 for the total instrument. The construct validation was performed by means of a factor analysis with Principal Component Analysis (PCA) extraction method and Varimax orthogonal factor rotation. Although factor analysis results have shown that the instrument has good evidence of construct validity, some adjustments in case of a new application of the instrument have also been suggested.

Modelo com qualidades psicométricas para avaliação da cultura de segurança em instalações nucleares