The Proper Role of Administrative Controls in the Implementation
of Controls for Criticality Safety The Double Contingency
Analysis (DCA) is a common tool used in the evaluation and
establishment of requirements for the control of criticality in
operations involving fissile materials. In one case involving a
chemical processing facility the administrative controls
resulting from the analysis did not contribute to safety. The
analysis (DCA) and resulting engineering documentation indicated
that the equipment and processes at this facility were designing
with engineered controls such that the assurance of criticality
safety would be simple and straightforward. These engineered
controls included the use of favorable geometry tanks, well
engineered gloveboxes, robust physical constraints on addition
of reflection and moderation, low fire loadings, primary
reliance on Halon fire suppression, siphon breaks, and the
physical design of eductors. These engineered features created a
scrap recovery process that needed o