DOE/ORO/2327 Oak Ridge Reservation Annual Site Environmental ...

Annual Site Environmental Report
ETTP dose to the ETTP-specific most exposed member of the public. Figure 3.5 conservatively illustrates
the estimated monthly and annual dose from TSCA Incinerator operations during 2009. During this
reporting period, tritium (31%) was the major dose contributor, followed by uranium-238 (22%) and
uranium-234 (18%). The total estimated airborne dose for all ETTP rad NESHAP stack emission sources
to the most exposed member of the public specific to this facility was only 0.06 mrem/year.
Fig. 3.5. Dose from TSCA Incinerator operations.
CNF was the highest contributor at approximately 70% of the total ETTP specific dose impact. The
emissions of radionuclides showed a dose increase as compared to the 2008 reporting period. This result,
a lower TSCA Incinerator dose impact, and the close proximity of the public identified CNF as the
highest ETTP contributor for 2009.
The K-1423 operation air permit does not require direct monitoring of stack radionuclide emission.
Compliance is demonstrated using onsite ambient air environmental sampling for determining the dose
impacts on members of the public. The annual dose as measured by environmental sampling at Station
K11 was 0.14 mrem. This conservatively represents the exposure of a member of the public if located at
this station. The station is conservatively located and collects samples that are potentially impacted by all
ETTP sources of radionuclide emissions, including both stack and fugitive emissions, to assure
conservative reporting of the estimated dose to an actual onsite member of the public.
Both sources are far below the 10 mrem/year effective dose (ED), which is the rad NESHAP
regulatory limit that is the applicable standard for combined radionuclide emissions from all ORR
facilities. Emissions from these sources as well as all other ETTP minor stationary sources of
radionuclides are included in the annual dose assessment report submitted as required under rad NESHAP
regulations.
ETTP operations during 2009 included two stationary sources with permits restricting nonradiological
emissions: the TSCA Incinerator and the CNF volatile organic compound (VOC) air stripper.
All other stationary sources were evaluated and determined to be below any emission level that would
require permitting.
The TSCA Incinerator was the largest permitted operating nonradionuclide air emissions source and
the largest source of criteria pollutant emissions such as nitrogen oxides (NOx) and carbon monoxide
(CO) for all sources listed in the DOE ETTP Major Source Operating Permit application. Total NOx
emissions for 2009 were 15.7 tons (31,347 lb). Total CO emissions were 3.9 tons (7,837 lb). Emissions of
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