Needs and accuracy requirements for fission product nuclear data in the out-of-pile fuel cycle

Both the conventional fuel cycles and a variety of alternative fuel cycles are outlined. The assessment of FPND requirements made at Bologna for the conventional cycles is confirmed in general, but cooling times of less than 6 months for FBR's are now regarded as unrealistic, so that certain FPND are no longer required for fuel cycle purposes. A preliminary assessment has been made of additional FPND requirements for alternative fuel cycles. Particular topics discussed include: Decay heat calculations, for which the decay energies of 89Sr, 137Cs, 141Ce and 144Pr are in doubt; radiation from spent fuel elements; fission yields of 3H, 129I, 95Zr/Nb, 103Ru, 106Ru/Rh, and stable and long-lived Mo, Tc and Pd, for all of which an accuracy of at least +-10% is desirable for striking a mass-balance in reactors and reprocessing plants; the 133Cs (nγ) cross-section, required in connection with burn-up measurements. (author)