CONSIDERATION OF SAFETY REQUIREMENTS FOR LARGE PACKAGES WITH Q SYSTEM

A large component (e.g. a replaced steam generator) might be best categorized as a surface contaminated object (SCO). Paragraph 523 of “Regulations for the Safe Transport of Radioactive Material”, TS-R-I, states, “SCO-I may be transported unpackaged but SCO-II may not.” Regarding SCO-II level objects, competent authorities have reviewed the safety analysis reports on “internal surface contamination levels” and “free drop” incidents, and they have approved them as “Special Arrangement” transports. In this paper, we consider “What conditions are the same level as requisite standards of safety established by TS-R-1?” with regard to safety analysis reports for Special Arrangement. Under normal conditions of transport, a component might “fall off the platform of a vehicle” or be “dropped during handling” in minor mishaps. In most cases, the packages would be relatively undamaged and would continue their journey after these minor mishaps. Under the accident conditions of transport, fire and collision are also included as accidents. TS-R- 1 requires little damage effect with contents limits for Type A and Type IP packages. As a simple example scenario, we find that if 10% of the internal activity is released from the component and 1% of particles are in the respirable size range, then the activity limit will be 10A2 for fixed and non-fixed surface contamination.