Click here to make tpub.com your Home Page

Page Title: Tritium Cleanup and Removal Systems
Back | Up | Next

Click here for thousands of PDF manuals

Google


Web
www.tpub.com

Home

   
Information Categories
.... Administration
Advancement
Aerographer
Automotive
Aviation
Construction
Diving
Draftsman
Engineering
Electronics
Food and Cooking
Logistics
Math
Medical
Music
Nuclear Fundamentals
Photography
Religion
   
   

 



DOE-HDBK-1129-99
4.1.2 Tritium Cleanup and Removal Systems
Current designs employ tritium removal systems. When tritium is released into a secondary, the
associated cleanup system starts, and the gases containing tritium are circulated through the
cleanup system, and the tritium is removed. See Figure 4-5 for a diagram of a typical gas-to-water
conversion tritium removal system.
FIGURE 4-5. Typical gas-to-water tritium removal system flow schematic
If the cleanup system is associated with a high quality barrier (leak rate of less than 1 Ci of tritium
in a period of 4 to 40 days) then tritium transfer to another container can take several days to
complete without a significant release of tritium to the environment. If the cleanup system is
associated with a medium quality barrier (leak rate of less than 1 Ci in 3 to 30 hours), then the
cleanup system flow rate needs to be high enough to remove tritium within a few hours in order to
prevent a significant release of tritium to the environment. If the cleanup system is associated with
a low quality barrier, (leak rate of 8 Ci or more per minute), then the cleanup system flow rate
needs to be very high so that tritium is removed from the gas before it is released to the
environment.
The captured tritium is generally removed by circulating the gas through a system that removes
tritium down to the part-per-billion level. Typical present-day cleanup systems remove tritium by
cracking the molecules on a hot catalyst. The free hydrogen atoms combine in the catalytic
reactor with the oxygen present to form water. The tritiated water is then removed from the gas by
molecular sieve traps. Depending upon the tritium species, the concentration reduction of these
systems can be from one million to one hundred million in a single pass.
The tritium released to the environment during this process is a function of the quantity of tritium
released, the volume, and leak rate of the container, and the cleanup rate of the tritium removal
system.
34


Privacy Statement - Press Release - Copyright Information. - Contact Us

Integrated Publishing, Inc. - A (SDVOSB) Service Disabled Veteran Owned Small Business