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The inspector general’s report on the green-salt release raises questions about the physical controls over the building where the incident happened.

In one portion of the highly redacted summary of the investigation, an interviewee noted that “because building C-410 is not monitored and radiological control technicians were only in the building when a crew is scheduled to work in it, anyone could have entered the facility in one of its many doors and placed the green salt in [redacted] air monitor.”

Mr. Echland said the lack of monitoring referred to the fact that employees were not tracked electronically or through surveillance inside the facility.

Still, he added, entry into the facility was “controlled through authorization by supervision and via limited access/entry points.”