[ RadSafe ] Transport Index
jjshonka at shonka.com
jjshonka at shonka.com
Sun Oct 5 16:50:47 CDT 2014
I think what you are looking for is NUREG-0170, FEIS on rad transport. It provides the basis of calculations that demonstrate the adequacy of the TIs. The TI limit can vary by mode of transportation. The assumptions are sometimes problematic.
For example, the NUREG authors assume flight attendants on passenger aircraft are constantly moving up and down the aisle serving passengers, and the calculation averages the dose from radioactive packages in the hold below the coach section over the entire compartment. For attendants that travel a regularly scheduled shipment route (often radiopharmaceuticals are shipped on Monday), that assumption is not valid and may not be conservative. For the 2008 exemption for air cargo shipments (allowing up to 200 TI for FEDEX and UPS, etc.), they required the rad shipments be placed towards the back of the cargo bay (behind bay 7 or 8). Distance and shielding provide considerable benefit in that case. I think a similar limitation is needed for passenger aircraft to limit the potential for placing radioactive packages below the galley where attendants work and have their seats.
From the NRC’s website on another NUREG:
“In September 1977, the NRC published NUREG-0170, “Final Environmental Statement on the Transportation of Radioactive Material by Air and Other Modes,” which assessed the adequacy of those regulations to provide safety assurance. “
Sent from Windows Mail
From: Philip Simpson
Sent: Sunday, October 5, 2014 3:41 PM
To: The International Radiation Protection (Health Physics) Mailing List
It’s my understanding that the TI is intended to limit exposures to the public and operators of common carrier conveyances assuming routine incidence and time of transport. The maximum total of TI that can be in a single common carrier vehicle is 50. However, I do not know what the specific assumptions are. For those who are interested in more Rad Mat transport details see the NRC/DOT “Reactor Concepts Manual - Transportation of Radioactive Material” and DOT “Radioactive Material Regulations Review”.
If your concern is exposure to personnel doing the radioactive material package preparation and handling (who are required by HAZMAT regulations to have proper training), there are probably bigger endemic rad safety issues.
Engineer II and Retired Assistant Reactor Manager
Michigan Memorial Phoenix Energy Institute
(Formerly the Phoenix Memorial Laboratory/Ford Nuclear Reactor)
University of Michigan
On Oct 3, 2014, at 11:36 PM, Joel C. <cehn at aol.com> wrote:
> Regarding DOT's TI (transportation index), I"ve been asked about the time of exposure to labeled packages being transported. TI is based on dose rate from the item being shipped. How is time factored into the index? Is there an assumption there?
> --- Joel Cehn, CHP
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