The U. S. Department of Transportation (DOT) Specification 6M containers had been the workhorse bulk Highly Enriched Uranium (HEU) shipping containers for the U. S. Department of Energy (DOE) and many other shippers for over 20 years. This DOT specification container was terminated for shipment of radioactive material on September 30, 2008. The anticipation of this action prompted DOE to develop and implement the ES-3100 shipping container as a replacement for the 6M. The ES-3100 was first licensed in April 2006. Since then, the license has been revised nine times. The ES-3100 was operationally ready for use at several sites by September 2007, and is now in being used on a regular basis for materials that had been shipped in the DOT 6M. The ES-3100 has also been certified for air transport, in support of foreign research reactor fuel supply and international nonproliferation efforts. This container has a Certificate of Compliance (CoC) from the U. S. Nuclear Regulatory Commission (NRC) and a Competent Authority Certificate from the DOT. The utility of the ES-3100 continues to grow. The ES-3100 CoC allows many forms of fissile material to be shipped, and continues to be amended to authorize additional contents for a variety of shippers. This paper will identify the currently certified contents for the ES-3100 and the planned certificate amendments to expand the content basis, as well as the approach to add new contents to the CoC. The path to becoming a user of the ES-3100 will be outlined. Operational requirements for this container, handling tools and non-standard operating tools needed for the use of this container will be covered. Readiness requirements, maintenance issues, training, and lessons learned will also be discussed. This paper will provide the information necessary for organizations to obtain ES-3100 containers, the special tools, adequate training, and any other information that would be helpful for a site to be able to use this fissile, radioactive material shipping container system.

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