[en] A study was performed to investigate the effect of preoperational factors in reactor construction on subsequent radiation buildup and reactor availability. Within the framework of the work performed, there is no indication that there is a correlation between plant radiation buildup and preoperational factors. There is some indication that those plants which had very close utility control in the precritical operations have a higher reactor availability. The reason for this is not obvious since no definitive correlation could be established with existing data between post-criticality equipment failure and preoperational practice. Existing specifications applicable to this period provide for adequate chemistry and cleanliness control. It would appear that for all practical purposes the ANSI standards could be eliminated. The study indicates there is a need for closer utility involvement during this period, particularly in the area of chemistry control