Abstract
Measurements within the Tokamak Fusion Test Reactor (TFTR) vacuum vessel atmosphere in 1985 indicated low levels of tritium oxide (HTO). From January to July 1987 approximately 3 x 10/sup 18/ D-D fusion neutrons were produced in TFTR operations. These reactions would be expected to produce a triton for each reaction or 5.4 GBq (145 milliCuries) of tritium. An HTO measurement made of the vessel on 7/10/87, five days after the last pulsing of the machine, but before the machine was let up to air, indicated and HTO level of 1 MBq m/sup -3/ (28 ..mu..Ci m/sup -3/) or approximately six times the DOE concentration guide value of 185 kBq m/sup -3/ (5 ..mu..Ci m/sup -3/). The ICRP 30 Derived Air Concentration (DAC) limit of 800 kBq m/sup -3/ (22 ..mu..Ci m/sup -3/) will become the limit when Draft DOE Order 5480.11 is implemented. A venting program for the vessel was set up with the objective of limiting the internal dose equivalent to personnel working inside the vacuum vessel. An HTO/HT measurement indicated a 57:1 ratio.
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