Characterization of Tank 19f Samples

Chemical Differences Between Sludge Solids at the F and H Area Tank Farms

“…The Cs-137/Ba-137m activities in the Tank 19F samples were orders of magnitude higher than the activities associated with any other radionuclides. 38 The recycle stream from the DWPF is rich in silicates, due to the high silicon content introduced by the glass frit. When the DWPF recycle stream is received into the Tank Receipt of laboratory waste into the Tank Farm is another operation which can impact the composition of tank waste, particularly in the area of radionuclide distributions.…”

Statistical Analysis of Tank 19f Floor Sample Results

“…Samples from eight locations have been obtained from the tank floor and two of the samples were archived as a contingency. Six samples, referred to in this report as the current scrape samples, have been submitted to and analyzed by SRNL [2].…”

“…This report contains the statistical analysis of the floor sample analytical results to determine if further data are needed to reduce uncertainty. Included are comparisons with the prior Mantis samples results [3] to determine if they can be pooled with the current scrape samples to estimate the upper 95% confidence limits (UCL 95% ) for concentration.…”

“…A subsequent sampling plan developed by Harris and Shine [1] was implemented to complete the characterization of the residual material on the floor of the tank. Specifically, the sample size was determined from a modification of the formula previously published in Edwards [4] and the sample characterization data for previous sampling of Tank 19F described by Oji [3]. The Harris and Shine sampling plan [1] was based on partitioning the Tank 19F floor into an inner and an outer ring and six 60° sectors as depicted in Figure 3.…”

“…The six Tank 19F samples ("as-received") were digested at SRNL and characterized without further processing such as drying. The conversion to a dried solids basis (original "as received" basis to dry basis) was accomplished through the use of the weight percent solid (wt %) [2,3]. For example, Ci/g dry solids = [Ci/g of "as received solids" x (100/ wt % solids)].…”