Testing Biota Dose Assessment Committee Methodology with 1997 Hanford Surveillance Data

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Testing Biota Dose Assessment Committee
Methodology with 1997 Hanford Surveillance Data
August 1999

• by
• E. Antonio (PNNL)
• and
• J. P. Lair (TRP)

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Purpose

• Test the DOE BDAC Methodology using Published
  Hanford Surveillance Data

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Scope

• Data Published in Hanford Site Environmental
  Surveillance Data 1997 (Bisping, 1998)
• Data was previously released, - should have No
  Surprises with compliance issues

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Methods

• Soil, Sediment and Surface Water Data Queried
  from Surveillance Database
• Hanford Site Maximum Concentrations Determined
  and Compared to DCGs
• For Sum of Fractions Which Exceeded One, Location
  Specific Analysis
• Data Further Broken Down by Geographic Location
  for Analysis

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Soil Results Sum of Fractions 0.137
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Sediment Results Sum Of Fractions 2.59E-4
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Water Results Sum of Fractions 11
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Water Results for 100-N Area Sum of Fractions
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• Spatial Considerations
• Maximum Sr-90 concentration in 100-N Spring water
  measured at 9,900 pCi/L
• Maximum Sr-90 concentration in River Water,
  collected near the 100-N spring (1 meter from
  shoreline, 30 cm depth) was 13 pCi/L
• Assuming a straight line dilution, the DCG
  concentration is reached 0.09 m(3.5 inches) from
  the point where the spring water enters the
  Columbia River
• Because of the relatively small spatial extent of
  the contamination occurring at the100-N Area,
  there should be no substantial risk to aquatic
  biota populations of the Hanford Reach of the
  Columbia River

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• Temporal Considerations
• From field observations, river bank springs are
  only exposed approximately
• 15 of the year, for the remainder, they are
  either not flowing or are underwater
• 100-N Springs flow rate estimated at 43 L/min
• 1997 average daily flow rate of the Columbia
  River approximated at 287 million L/min
• No substantial community of aquatic organisms can
  exist in the undiluted springwater for an entire
  year

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218-W-4B Trench Data

• From Napier 1981

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Presentation using Site 218-W-4B (Trenches) data
Nuclide Curies pCi/g Co60 1400 14000 Sr90 280
2800 Cs137 310 3100 Th232 .061 .61 U233 74
750 U234 2.6 26 U235 .079 .79 U238 1.9 19
Pu238 68 680 Pu239 3000 30000 Pu240 760 7600
Pu241 9200 92000 Pu242 .27 2.8 Am214 2.1 2
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Original Terrestrial Animal Parameter Worksheet
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Modified (1st Modification) Terrestrial Animal
Worksheet
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Modified (2nd Modification) Terrestrial Animal
Worksheet
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