Final report for tank 241-B-203, push mode cores 115, 120 and 122

Tank characterization report for single-shell tank 241-B-203

“…As directed in the Tank 241-B-203 Push Mode Core Sampling and AnaZysis Plan (Jo 1996c), safety screening analyses were performed on the two core samples to screen the tank for three safety issues: energetics, criticality, and headspace flammability. The required analyses were differential scanning calorimetry @SC) to evaluate fuel level and energetics, thermogravimetric analysis (TGA) to determine moisture content, total alpha activity analysis (to evaluate criticality potential), and bulk density.…”

“…The average flammable vapor content was 0 percent of the lower flammability limit, indicating no flammability concerns. During the flammable gas monitoring, the concentrations of oxygen (20.6 percent), total organic vapors (0 ppm), and ammonia (0 ppm) were also measured (Jo 1996b). …”

“…The analytical results indicated that there was only a small amount of contamination (less than 2 percent) in the samples from the wash water. Therefore, no adjustments were made for the TGA results (Jo 1996b). The analytical data for lithium and bromide are presented in Appendix B.…”

“…All the pertinent QC tests were conducted on the 1995 core samples, allowing a full assessment regarding the accuracy and precision of the data. The SAP (Jo 1996c) established the specific criteria for the primary and secondary analytes required by the safety screening DQO, whereas the opportunistic analytes (TIC, and ICPlIC analytes other than lithium and bromide) were governed by the laboratory criteria (DOE 1995). Quality control results outside the specified criteria for all analytes are identified by footnotes in the Appendix A tables.…”

“…A description of the units and symbols used in the analyte tables and the sources used in compiling the analytical data (Jo 1996b) are found in the List of Terms and Section 7.0, respectively. For information on sampling rationale, locations, and descriptions of sampling events, see Section 3.0.…”