12 Matching Results

Search Results

Advanced search parameters have been applied.

Distribution of radionuclides in L-Lake surface sediments phase 3

Description: Gamma-emitting radionuclides in L Lake were examined in situ with an underwater High Purity Germanium (HPGe) detector and further studied by retrieving various sediment samples for analysis by HPGe gamma spectrometry. The predominant man-made radionuclide detected was cesium-137. These measurements constituted Phase 3 of a four phase strategy for characterizing L-Lake contaminants. The data provided by these studies will be utilized in the preparation of an Environmental Impact Statement that evaluates the consequences of discontinuing river water pumping to the man-made cooling water reservoirs on the Savannah River Site. A site evaluation report will also be prepared for the L-Lake basin.
Date: August 1, 1996
Creator: Dunn, D.L.
Partner: UNT Libraries Government Documents Department

Surface Sediments in Precooler Ponds 2, 4, and 5: March 2000

Description: Pond 2, Pond 4, and Pond 5 are inactive reactor cooling impoundments built in 1961 on the R-Reactor Effluent System in the east-central portion of the Department of Energy's Savannah River Site in Aiken, South Carolina. These precooler ponds are part of the Par Pond cooling water system and are considered part of the Par Pond operable unit. The intent was not to characterize the ponds, but to identify the maximum levels of contamination that could be exposed if the ponds are drained to remove the danger of dam failure.
Date: January 29, 2001
Creator: Dunn, D.L.
Partner: UNT Libraries Government Documents Department

Effluent Treatment Facility tritium emissions monitoring

Description: An Environmental Protection Agency (EPA) approved sampling and analysis protocol was developed and executed to verify atmospheric emissions compliance for the new Savannah River Site (SRS) F/H area Effluent Treatment Facility. Sampling equipment was fabricated, installed, and tested at stack monitoring points for filtrable particulate radionuclides, radioactive iodine, and tritium. The only detectable anthropogenic radionuclides released from Effluent Treatment Facility stacks during monitoring were iodine-129 and tritium oxide. This paper only examines the collection and analysis of tritium oxide.
Date: July 25, 1991
Creator: Dunn, D.L.
Partner: UNT Libraries Government Documents Department

Consolidated Incineration Facility Tritium Emissions Monitoring

Description: The Savannah River Technology Center, a research and development facility at the US Department of Energy`s Savannah River Site, provides environmental and regulatory compliance support to onsite operations. A new consolidated Incinerator Facility at SRS is being built to treat hazardous and a combination of hazardous and radioactive (mixed) wastes.
Date: March 29, 1995
Creator: Dunn, D. L. & Aggus, J.R.
Partner: UNT Libraries Government Documents Department

Mapping radionuclide distribution in surface sediments using GIS and an underwater HPGe detector

Description: A radiological distribution survey at the L Lake on the Savannah River Site (SRS) was conducted by the Savannah River Technology Center (SRTC) during the summer of 1995 as part of a larger project to examine future alternatives for L Lake and other SRS water bodies. The primary purpose of the survey was to confirm previous radionuclide surveys of Cesium-137 (137Cs) in the L Lake area. EG and G Energy Measurements, Inc. conducted an aerial, baseline radiological survey of the L Lake area and the Steel Creek drainage basin in 1985. Overflight gamma mappings of the area by EG and G indicated that the only significant man-made radionuclides were located in the stream beds3, which were subsequently covered by the reservoir. The major concern was to see if any of the man-made radiation was redistributed over time away from the stream beds. In the current study an underwater HPGe detector was used to scope the possibility of sediment redistribution from the stream beds beneath L Lake. The underwater detector was positioned to view the bottom sediment and the geographic position of the pontoon boat used for deployment was recorded. The count rate at each position is proportional to the radiation level that would be observed if the lake water were absent, as in the 1985 overflight measurements. Thus, the 1995 study yields count rate profiles that are appropriate for comparison with the gamma mappings of 1985.
Date: September 1, 1996
Creator: Dunn, D.L.; Winn, W.G. & Bresnahan, P.J.
Partner: UNT Libraries Government Documents Department

Distribution of lake-bottom radionuclides measured with an underwater HPGe detector

Description: This study at Savannah River was done to assist decisions on the future of L Lake, an artificial reservoir made in 1983-5 for additional cooling for L Reactor discharges. EG&G overflight NaI mappings prior to filling indicated that most of the man-made radionuclides were {sup 60}Co and (predominantly) {sup 137}Cs in the earlier stream beds lying beneath the lake. An underwater HPGe was used in 1995 to rapidly scope the present radiation levels at 96 locations in the lake. The present levels are in reasonable agreement with the earlier overflight mappings. 1 fig, 4 figs.
Date: July 1, 1996
Creator: Winn, W.G.; Dunn, D.L. & Bresnahan, P.J.
Partner: UNT Libraries Government Documents Department

Scoping measurements of radionuclides in L Lake with an underwater HPGe detector

Description: This study of L Lake was conducted to determine whether the distribution of man-made radiation levels had changed from the time preceding the filling of the newly created lake in 1985. Overflight gamma measurements by EG&G in 1985 mapped the man-made radiation levels, indicating that significant levels were only detected from former stream beds that were to be covered by the lake. the present scoping gamma measurements were consistent with these earlier findings, indicating no major evidence of movement of the radioactivity. These results will be available to guide decisions concerning future plans for the lake. Gamma-emitting radionuclides of L Lake were examined in situ with an underwater HPGe detector and further studied by retrieving various sediment samples for analysis by HPGe gamma spectrometry in the Underground Counting Facility. The predominant man-made radionuclide detected was {sup 137}Cs; it had about 100 times greater activity than {sup 60}Co, which was the only other man-made radionuclide that was detected above trace levels.
Date: June 1, 1996
Creator: Dunn, D.L.; Win, W.G. & Bresnahan, P.J.
Partner: UNT Libraries Government Documents Department

Environmental aspects of the June 16, 1995 tritium release from the Savannah River Site

Description: On June 16, 995 approximately 10,700 Ci of elemental tritium (HT) were released through a 200 ft stack during a welding operation in H-area while stainless steel containers were being prepared for burial. The workers immediately evacuated the room and H-area personnel were instructed to remain indoors for 30 minutes. The dose at the site boundary was calculated with the WINDS system atmospheric transport model to be 3x10{sup -6} mrem, a value one-hundred million times smaller than the yearly average dose for SRS area (300 mrem). The plume moved in a west south-west direction and crossed the Savannah River into Georgia about
Date: August 1, 1995
Creator: Kurzeja, R.J.; Fledderman, P.D.; Dunn, D.L. & MacMurdo, K.W.
Partner: UNT Libraries Government Documents Department

High-frequency acoustic imaging of L Lake Phase 4 [Savannah River Site, South Carolina]

Description: The objective of the seismic reflection and side scan sonar survey is to determine the location, aerial extent, and depth of burial pits situated along the reservoir bottom of L Lake, Savannah River Site, SC. The results will be used in the overall characterization of L Lake by providing continuous profile line coverage of the bottom and subbottom sediment structure along the entire length of the project area. The results are also intended to supplement previous scientific information obtained from soil samples, aerial photography, and radiometric studies. Resultant information will be used as input for an Environmental Impact Statement of the site. Overall, the seismic reflection data will provide better descriptions of variations in the actual subbottom conditions and help identify the differing sediment layers. The side scan sonar will help identify the location of the burial pits and any other features on the bottom of the reservoir. A 3.5 kiloHertz (kHz), high resolution subbottom profiling system and an EG&G Model 260 side scan sonar system were used to meet the primary objectives of the investigation.
Date: March 17, 1997
Creator: Dunn, D. L.; Sjostrom, Keith J.; Leist, Rodney L. & Harmon, Thomas S., Jr.
Partner: UNT Libraries Government Documents Department

Using Stratasampler{sup {alpha}} Multi-Level Wells to Examine the Hyporheic Zone within a Riparian Wetland

Description: The initial objectives of this research are to establish a baseline and monitor the influences of local scale hydrology and biogeochemical behavior within the hyporheic zone at an unimpacted, uncontaminated site.
Date: February 1998
Creator: Dunn, D. L.; Dixon, K. L.; Nichols, R. L.; Schwartzman, A. & Roseberry, R.
Partner: UNT Libraries Government Documents Department

Emergency response monitoring activities and environmental impact of the K-Reactor aqueous tritium release of December 1991

Description: Approximately 150 gallons of tritiated water leaked from one of the K-Reactor heat exchangers between December 22 and December 25, 1991. Upon notification, the Environmental Technology Section (ETS) activated its emergency response team to provide predictions of river concentrations, transport times, and radiological effects to downstream water users. Additionally, within a few days of the release, ETS and the Environmental Monitoring Section (EMS) began a comprehensive program to collect and analyze surface water samples from SRS down to the Savannah River estuary. The TRAC mobile laboratory was deployed to the Beaufort-Jasper water treatment plant to provide initial analyses for downriver water samples. This document discusses the results of the sampling activities. Concentration levels are provided along with hypothetical maximum individual doses.
Date: February 7, 1992
Creator: Hamby, D.M.; Addis, R.P.; Beals, D.M.; Cadieux, J.R.; Carlton, W.H.; Dunn, D.L. et al.
Partner: UNT Libraries Government Documents Department