A Study on the applicability of uncertainty quantification and sensitivity analysis in validation process for fast reactor plant dynamics analysis code

Hamase, Erina ; Kawamura, Takumi*; Doda, Norihiro  ; Tanaka, Masaaki 

To ensure the reliability of analysis results from the plant dynamics analysis code Super-COPD, a validation process comprising forward uncertainty quantification (Forward UQ) and sensitivity analysis (SA) using the Sobol method was developed. Uncertainty propagation analysis of input parameters was performed for the loss of flow without scram test in the FFTF and demonstrated that encompassing test results can serve as one measure validation criterion. Furthermore, SA identified dominant input parameters affecting uncertainty and provided effective targets for reducing uncertainty. This study confirms that Forward UQ and SA using the Sobol method are applicable for the validation process.