ANALYSES AND COMPARISON OF BULK AND COIL SURFACE SAMPLES FROM THE DWPF SLURRY MIX EVAPORATOR

Hay, M. ; Nash, C. ; Stone, M.

关键词: AR FACILITIES;    ADDITIVES;    BORON;    EVAPORATORS;    FOULING;    HEAT TRANSFER;    HEATING;    LITHIUM;    MERCURY;    RADIOISOTOPES;    SILICON;    SLUDGES;    STEAM;    TANKS;    X-RAY DIFFRACTION;   

DOI  :  10.2172/1038731
RP-ID  :  SRNL-STI-2011-00623
PID  :  OSTI ID: 1038731
Others  :  TRN: US1202110

学科分类：核能源与工程

美国|英语

来源: SciTech Connect

【 摘 要 】

Sludge samples from the DWPF Slurry Mix Evaporator (SME) heating coil frame and coil surface were characterized to identify differences that might help identify heat transfer fouling materials. The SME steam coils have seen increased fouling leading to lower boil-up rates. Samples of the sludge were taken from the coil frame somewhat distant from the coil (bulk tank material) and from the coil surface (coil surface sample). The results of the analysis indicate the composition of the two SME samples are very similar with the exception that the coil surface sample shows {approx}5-10X higher mercury concentration than the bulk tank sample. Elemental analyses and x-ray diffraction results did not indicate notable differences between the two samples. The ICP-MS and Cs-137 data indicate no significant differences in the radionuclide composition of the two SME samples. Semi-volatile organic analysis revealed numerous organic molecules, these likely result from antifoaming additives. The compositions of the two SME samples also match well with the analyzed composition of the SME batch with the exception of significantly higher silicon, lithium, and boron content in the batch sample indicating the coil samples are deficient in frit relative to the SME batch composition.