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Tanaka, Masaaki
no journal, ,
Author has proposed a procedure combined with V&V and numerical prediction processes called as V2UP (V&V plus Uncertainty quantification and Prediction) in a numerical estimation by multi-dimensional simulation codes. In the V2UP, uncertainty quantification by Grid Convergence Index (GCI) is required in the verification and the fundamental validation steps. The numerical simulations and the uncertainty quantifications were conducted using several GCI estimation methods in order to specify the reference method in the V2UP. Through the examinations, the SLS-GCI (Simplified Least Square version GCI) method modified from the Eca's least-square version GCI method could be defined.
Tanaka, Masaaki
no journal, ,
In order to enhance the simulation credibility, it is necessary to establish the procedure on verification and validation including the estimation of the modeling uncertainty. Lessons learned from the Fukushima Daiichi NPP Accident have indicated that it was important to recognize the credibility of the simulation. By putting forward to standardize the procedure on verification and validation including the estimation of the modeling uncertainty, it is expected to establish the basis of the simulation technology to realize the world highest level of nuclear safety and continuous improvement. The recent activity in the Atomic Energy Society of Japan (AESJ) for the guideline establishment is introduced.