A critical study on best methodology to perform UQ for RIA transients and application to SPERT-III experiments
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The aim of this paper is to assess the reliability and accuracy of the PSI standard method, used in manyprevious works, for the quantification of ND uncertainties in the SPERT-III RIA transient, by quantifyingthe discrepancy between the actual inserted reactivity and the original static reactivity worth and theirassociated uncertainties. The assessment has shown that the inherent S3K neutron source renormalization scheme, introduced before starting the transient, alters the original static reactivity worth of thetransient CR and reduces the associated uncertainty due to the ND perturbation. In order to overcomethese limitations, two additional methods have been developed based on CR adjustment. The comparative study performed between the three methods has showed clearly the high sensitivity of the obtained results to the selected approach and pointed out the importance of using the right procedure inorder to simulate correctly the effect of ND uncertainties on the overall parameters in a RIA transient. This study has proven that the approach that allows matching the original static reactivity worth andstarting the transient from criticality is the most reliable method since it conservatively preserves theeffect of the ND uncertainties on the inserted reactivity during a RIA transient.
Abstract
The aim of this paper is to assess the reliability and accuracy of the PSI standard method, used in manyprevious works, for the quantification of ND uncertainties in the SPERT-III RIA transient, by quantifyingthe discrepancy between the actual inserted reactivity and the original static reactivity worth and theirassociated uncertainties. The assessment has shown that the inherent S3K neutron source renormalization scheme, introduced before starting the transient, alters the original static reactivity worth of thetransient CR and reduces the associated uncertainty due to the ND perturbation. In order to overcomethese limitations, two additional methods have been developed based on CR adjustment. The comparative study performed between the three methods has showed clearly the high sensitivity of the obtained results to the selected approach and pointed out the importance of using the right procedure inorder to simulate correctly the effect of ND uncertainties on the overall parameters in a RIA transient. This study has proven that the approach that allows matching the original static reactivity worth andstarting the transient from criticality is the most reliable method since it conservatively preserves theeffect of the ND uncertainties on the inserted reactivity during a RIA transient.
참고문헌 (7)
- R. K. Mc Cardell, "Reactivity Accident Tests Results and Analyses for the SPERT III E-Core a Small Oxide-Fueled, Pressurized Water Reactor", ~ (1969)
- G. Grandi, "Qualification of CASMO5", SIMULATE-3K against the SPERT III E-core cold start-up experiments, 2012, ~
- G. Grandi, "Validation of CASMO", SIMLATE-3K using the PSERT III E-core: cold start-up, hot start-up, hot standby and full power conditions, 2014, ~
- W. Wieselquist, "PSI methodologies for nuclear data uncertainty propagartion with CASMO-5M and MCNPX: results for OECD", NEA UAM benchmark pahse I, 2013, ~
- O. Leray, "Methodology for core analyses with nuclear data uncertainty quantification and application to Swiss PWR operated cycles", Ann. Nucl. Energy, 110, pp.547~559 (2017)
- A. Dokhane, "Validation of PSI best estimate plus uncertainty methodology against PSERT-III reactivity intiated accident experiments", Ann. Nucl. Energy, 118, pp.178~184 (2018)
- A. Dokhane, "Recent developments in PSI BEPU analysis for SPERT-III RIA transient: ND uncertainty breakdown and kinetic parameters uncertainty assessment", Nuclr. Energy Des, 283 (2021)