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Past opinion polls have shown that major nuclear accidents can have a serious impact on public attitudes. Drawing on a values-beliefs-norms (VBN) model of environmental commitment, the authors hypothesized that a major nuclear accident may also affect the most durable cognitive and cultural foundations that underpin public perceptions of nuclear power. For 32 Italian participants, the authors assessed perceptions of nuclear power and values 1 month before and after the Fukushima nuclear accident. Participants reported decreases in nuclear trust, environmental organization trust, and pronuclear attitudes; they reported a significant increase in environmental beliefs assessed by the new ecological paradigm and a marginally significant increase in altruism. Major nuclear accidents may have the potential to influence values and proenvironmental beliefs, probably for the reason that they are the basis of public attitudes toward nuclear power. [ABSTRACT FROM PUBLISHER]