This type of test resulted in several criticality accidents.

That would have made a nuclear reaction, which physicists call a "criticality accident," much more likely.

This could arise from a major criticality accident or fire.

Since 1945 there have been at least 60 criticality accidents.

This was the first known criticality accident causing a fatality.

There was a sub story of a death due to a criticality accident.

The criticality accidents may be divided into two classes.

He was the first known fatality caused by a criticality accident.

The plant had already experienced at least two instances of "criticality" accidents in the 1970's, the inspectors said.

In October 1958, there was a criticality accident at one of the research reactors.