Comparison of the Current Center of Site Annual Neshap Dose Modeling at the Savannah River Site with Other Assessment Methods

Kelsey M. Minter, G. Timothy Jannik, Brooke H. Stagich, Kenneth L. Dixon, Joseph R Newton

Research output: Contribution to journalArticle

Abstract

The U.S. Environmental Protection Agency (EPA) requires the use of the model CAP88 to estimate the total effective dose (TED) to an offsite maximally exposed individual (MEI) for demonstrating compliance with 40 CFR 61, Subpart H: The National Emission Standards for Hazardous Air Pollutants (NESHAP) regulations. For NESHAP compliance at the Savannah River Site (SRS), the EPA, the U.S. Department of Energy (DOE), South Carolina's Department of Health and Environmental Control, and SRS approved a dose assessment method in 1991 that models all radiological emissions as if originating from a generalized center of site (COS) location at two allowable stack heights (0 m and 61 m). However, due to changes in SRS missions, radiological emissions are no longer evenly distributed about the COS. An area-specific simulation of the 2015 SRS radiological airborne emissions was conducted to compare to the current COS method. The results produced a slightly higher dose estimate (2.97 × 10-4 mSv vs. 2.22 × 10-4 mSv), marginally changed the overall MEI location, and noted that H-Area tritium emissions dominated the dose. Thus, an H-Area dose model was executed as a potential simplification of the area-specific simulation by adopting the COS methodology and modeling all site emissions from a single location in H-Area using six stack heights that reference stacks specific to the tritium production facilities within H-Area. This "H-Area Tritium Stacks" method produced a small increase in TED estimates (3.03 × 10-4 mSv vs. 2.97 × 10-4 mSv) when compared to the area-specific simulation. This suggests that the current COS method is still appropriate for demonstrating compliance with NESHAP regulations but that changing to the H-Area Tritium Stacks assessment method may now be a more appropriate representation of operations at SRS.

Original languageEnglish (US)
Pages (from-to)408-413
Number of pages6
JournalHealth Physics
Volume114
Issue number4
DOIs
StatePublished - Apr 1 2018

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Rivers
Tritium
Air Pollutants
United States Environmental Protection Agency
Environmental Health
Compliance

Keywords

  • dose assessment
  • environmental transport
  • radiation, atmospheric
  • safety standards

ASJC Scopus subject areas

  • Epidemiology
  • Radiology Nuclear Medicine and imaging
  • Health, Toxicology and Mutagenesis

Cite this

Comparison of the Current Center of Site Annual Neshap Dose Modeling at the Savannah River Site with Other Assessment Methods. / Minter, Kelsey M.; Jannik, G. Timothy; Stagich, Brooke H.; Dixon, Kenneth L.; Newton, Joseph R.

In: Health Physics, Vol. 114, No. 4, 01.04.2018, p. 408-413.

Research output: Contribution to journalArticle

Minter, Kelsey M. ; Jannik, G. Timothy ; Stagich, Brooke H. ; Dixon, Kenneth L. ; Newton, Joseph R. / Comparison of the Current Center of Site Annual Neshap Dose Modeling at the Savannah River Site with Other Assessment Methods. In: Health Physics. 2018 ; Vol. 114, No. 4. pp. 408-413.
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