Analytical validation of uncertainty in reactor physics parameters for nuclear transmutation systems

Sugawara, Takanori  ; Nishihara, Kenji  ; Tsujimoto, Kazufumi ; Sasa, Toshinobu   ; Oigawa, Hiroyuki 

To confirm the reliability of calculated reactor physics parameters for the nuclear transmutation systems, the uncertainty calculated by the covariance data prepared in JENDL-3.3 was compared with the differences of the reactor physics parameters in the Monte-Carlo calculation using different nuclear data libraries. The Accelerator Driven System (ADS) and the Minor Actinide (MA) loaded Fast Reactor (FR) were selected as the representative transmutation systems. The results showed that the uncertainties calculated by JENDL-3.3 covariance data were smaller than the differences of the reactor physics parameters among the nuclear data libraries. The cause of this discrepancy was that the covariance data of main nuclides and reactions in JENDL-3.3 were smaller than the relative differences in the cross sections among the nuclear data libraries. It is required to verify the uncertainty by integral experiments and to discuss the uncertainty utilization for the nuclear design accuracy.