Liquid metal cooled fast breeder type reactors (LMFBR) are one of the most promising energy producing systems for the future. The Fast Flux Test Facility (FFTF) currently under construction at the Hanford Engineering Development Laboratory will be the major test facility supporting the development of LMFBRs. R&D work done over the past five years on sodium programs in support of FFTF have resulted in substantial improvements in the sampling, analyzing and monitoring of sodium systems as described by Burris and Singer(1) in November, 1972.

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