WASHINGTON, Dec. 27 -- The Defense Nuclear Facilities Safety Board Resident Inspector in Hanford issued the following activity report for the week ending December 5, 2025: * * * TO: Technical Director FROM: Hanford Site Resident Inspectors SUBJECT: Hanford Activity Report for the Week Ending December 5, 2025 Emergency Preparedness: A resident inspector observed the kickoff of an Apparent Cause Evaluation (ACE) of the findings identified during the site's annual evaluated field exercise (see  more