Thermal Hydraulic Computer Code Uncertainty Quantification Using Quantified PIRT

摘要

U.S. NRC has revised the reactor licensing rules in 1988 to allow the use of best-estimate computer code given that the uncertainties are quantified. In 1989, CSAU methodology [1] was developed by NRC for thermal hydraulic code uncertainty quantification, which requires the computer code must be validated before uncertainty quantification process through a wide range of SET and IET tests. Only after a trustable validation process, then the uncertainty analysis is meaningful. Response surface method was adopted in CSAU to construct a response surface for the PCT from multiple code runs with varying code parameters.