Basis of Defining ''Not Normally Occupied Area'' for Personal Criticality Detector Application Per ANS 8.3 at SRS

DOE Order 420.1A, Facility Safety , requires the installation of Criticality Accident Alarm System (CAAS) to detect the radiation from an unplanned and uncontrolled nuclear reaction and to notify building occupants of such an event if the expected dose exceeds 12 rads in free air. DOE Order 420.1A requires that the Nuclear Criticality Safety Program be based on the requirements in ANSI/ANS-8.3-1997 . This standard permits the use of portable criticality detection instruments ''in areas that are not normally occupied.'' This paper provides a basis for a working definition of the term ''not normally occupied'' for the application of APCDs at the Savannah River Site (SRS)