To dream of a nuclear war represents feelings about conflict that risks total devastation of relationships, status, or financial resources. Conflict where both sides mat risk totally wiping each other out completely. Feeling that you are fighting against a problem that risks all that you care about. Risking everything you have to keep everything you have.
Example: A man dreamed of feeling that was imminent. In waking life he was totally distraught after finding out his father was just diagnosed with a terminal illness. The nuclear war may have reflected his feelings about imminent financial losses with legal problems and family lawsuits as soon as his father died.
Example 2: A young man dreamed of experiencing breaking out. In waking life he was fearing an friend finding out that he was now dating his girlfriend and trying to break them up or embarrass him by revealing other person secrets.