Under which condition does OSHA conduct an imminent danger inspection?

OSHA conducts an imminent danger inspection specifically when there is a credible report indicating that a situation poses an immediate risk to workers' safety and health. This situation is characterized by conditions that could reasonably be expected to cause death or serious physical harm to employees if not addressed promptly. The focus here is on the immediacy of the danger; hence, when there is a report of imminent danger, it triggers OSHA's need to act quickly to investigate the issue and take appropriate measures to protect workers.

The context of the other options is important for understanding the specific nature of imminent danger. Reporting workplace injuries or fatalities often leads to investigations, but those situations do not necessarily classify as imminent dangers unless they indicate ongoing severe risks. Similarly, failing to meet health standards generally results in inspections but does not capture the critical immediacy associated with imminent dangers. Thus, the essence of this answer lies in OSHA's responsiveness to urgent threats rather than more generalized safety or compliance issues.