United States Enrichment Corporation — Hazardous Materials Safety Interpretation

Page 1U.S. Department 400 Seventh St., S.W. of Transportation Washington, D.C. 20590 MAR 1 3 2001 Dr. M. E. Darrough Reference No.: 00-0304 Director, Transportation Programs United States Enrichment Corporation 6903 Rockledge Drive Bethesda, MD 20817-1818 Dear Dr. Darrough: This is in response to your letter and telephone conversation with Dr. Fred Ferate, Radioactive Materials Branch, Office of Hazardous Materials Technology, concerning the term "return to service" as used in 49 CFR 173.443(c). As you were informed by Dr. Ferate, as used in § 173.443(c), the term "return to service" refers to the point at which a trailer or railcar used to transport a Class 7 exclusive use shipment is determined by the offeror to satisfy the prescribed contamination control limits and is released from exclusive use status and placed back in transportation for general use. I hope this satisfies your request. Sincerely, Hitle t mitthel Hattie L. Mitchell Chief, Regulatory Review and Reinvention Office of Hazardous Materials Standards 173.443 000304#

Page 2Corbin *USEC § 173.443(0) A Global Energy Company October 25, 2000 RAM 50-0304 Office of Hazardous Materials Standards Edward Mazzullo, Director U.S. Department of Transportation Room 8422 400 Seventh Street, S. W. Washington, D. C. 20590-0001 Dear Mr. Mazullo: This letter is written to request that the U. S. Department of Transportation (DOT) and the specific term "return to service." The United States Enrichment Corporation was issue a written clarification of 49 CFR 173.443 (c), regarding "Contamination Control" given an oral interpretation of this regulation during an October 24, 2000 telephone conversation with Dr. Fred Ferate, technical support staff of DOT's Radioactive Materials Branch, Research and Special Programs Administration. Dr. Ferate indicated that "return to service" refers to the point at which a trailer or railcar is released from exclusive use status and is being returned to the vendor for general use. USEC concurs with this interpretation. We are requesting a written clarification for our records for future reference. If there are questions concerning this matter, please contact me at (301) 564-3422 or USEC's Traffic Manager, Mr. Don McCarty at (740) 897-2668. Sincerely, M. Elizabeth Darrough, Ph.D. Director, Transportation Programs CC: J. Adkins R. Boyle, DOT F. Ferate, DOT L. Krause D. McCarthy, PORTS S. Penrod, PGDP United States Enrichment Corporation 6003 Rockledge Drive, Bethesda, MD 20817-1818 Telephone 301-564-3200 Fax 301-564-3201 http://www.usec.com#