Evaluation of Near Field Atmospheric Dispersion Around Nuclear Facilities Using a Lorentzian Distribution Methodology
- Idaho State Univ., Pocatello, ID (United States). Dept. of Nuclear Engineering and Health Physics
Atmospheric dispersion modeling within the near field of a nuclear facility typically applies a building wake correction to the Gaussian plume model, whereby a point source is modeled as a plane source. The plane source results in greater near field dilution and reduces the far field effluent concentration. However, the correction does not account for the concentration profile within the near field. Receptors of interest, such as the maximally exposed individual, may exist within the near field and thus the realm of building wake effects. Furthermore, release parameters and displacement characteristics may be unknown, particularly during upset conditions. Therefore, emphasis is placed upon the need to analyze and estimate an enveloping concentration profile within the near field of a release. This investigation included the analysis of 64 air samples collected over 128 wk. Variables of importance were then derived from the measurement data, and a methodology was developed that allowed for the estimation of Lorentzian-based dispersion coefficients along the lateral axis of the near field recirculation cavity; the development of recirculation cavity boundaries; and conservative evaluation of the associated concentration profile. The results evaluated the effectiveness of the Lorentzian distribution methodology for estimating near field releases and emphasized the need to place air-monitoring stations appropriately for complete concentration characterization. Additionally, the importance of the sampling period and operational conditions were discussed to balance operational feedback and the reporting of public dose.
- Research Organization:
- Idaho National Lab. (INL), Idaho Falls, ID (United States)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- AC07-05ID14517
- OSTI ID:
- 1177673
- Report Number(s):
- INL/JOU-15-34241; TRN: US1500090
- Journal Information:
- Health Physics, Vol. 107, Issue 6; ISSN 0017-9078
- Publisher:
- Health Physics Society
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
Fission Product Release
Gaseous Effluents
Radioactive Effluents
Radiation Doses
Radioecological Concentration
CONCENTRATION RATIO
AIR
ABUNDANCE
NUCLEAR FACILITIES
EVALUATION
POINT SOURCES
Source Terms
Spatial Distribution
DILUTION
PLUMES
SAMPLING
Air Pollution Monitoring
Radiation Monitoring
SIMULATION
Atmospheric dispersion modeling