Measurement of U-235 and Pu-239 fission products in HLW solutions at the Savannah River Technology Center

NUCL 40

Ned E. Bibler, Terri L. Fellinger, William T. Boyce, Mira A. Malek, and Frank M. Pennebaker. Savannah River Technology Center, Westinghouse Savannah River Company, Aiken, SC 29808
Fission products from irradiation of U-235 and Pu-239 in Savannah River Site (SRS) reactors are currently being immobilized into a durable glass for final disposal. The products are in interim storage as caustic slurries in million gallons tanks along with other products of processing at SRS. Prior to immobilization, the concentrations of the fission products have to be measured or estimated in the waste. At Savannah River Technology Center appropriate samples of the slurries are dissolved remotely and the solutions analyzed by a variety of techniques. Concentrations of ~70 fission products have been measured. Maximum concentrations of others can be estimated using a fission yield scaling factor. This factor is calculated from those products whose chemical properties are such that their concentrations are directly proportional to their fission yields from either U-235 or Pu-239 depending on the source of the waste. Results for a waste from Hanford will also be presented.