On the use of time-dependent success criteria within Risk-Informed Analyses. Application to LONF-ATWS sequences in PWR reactors

Sanchez-Torrijos Jorge; Queral Cesar; Paris Carlos; Rebollo Maria Jose; Sanchez-Perea Miguel; Posada Jose Maria

doi:10.1016/j.net.2022.08.019

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자료유형: 학술저널

저자정보: Sanchez-Torrijos Jorge (Universidad Polit ecnica de Madrid, Ramiro de Maeztu) Queral Cesar (Universidad Polit ecnica de Madrid, Ramiro de Maeztu) Paris Carlos (Universidad Polit ecnica de Madrid, Ramiro de Maeztu) Rebollo Maria Jose (Nfq Solutions) Sanchez-Perea Miguel (Consejo de Seguridad Nuclear) Posada Jose Maria (Almaraz-Trillo AIE)

저널정보: 한국원자력학회 Nuclear Engineering and Technology Nuclear Engineering and Technology 제54권 제12호

발행연도: 2022.12

수록면: 4,601 - 4,619 (19page)

DOI: 10.1016/j.net.2022.08.019

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The classical Probabilistic Safety Analysis (PSA) does not include any time dependence explicitly. However, the success criteria (SC) could evolve during the cycle for some initiating events. In that sense, there is a type of sequence in which this time-dependency is quite important, the family of Anticipated Transient without Scram (ATWS) sequences in Pressurized Water Reactors. Therefore, a new riskinformed approach is proposed in this paper, which makes it possible to obtain the time-dependent SC evolution of the safety functions affected by the Moderator Temperature Coefficient (MTC) value. Then, the evolution of the ATWS conditional core damage probability (CCDP) could be obtained using a PSA model. To quantify the CCDP, the average values of the time-dependent failure probabilities must be computed. Finally, the comparison between the CCDP obtained through the application of the classical PSA approach and the new one makes it possible to quantify the impact of time-dependence on the SC of the headers that this new risk-informed ATWS approach can provide.

#Anticipated transient without SCRAM (ATWS) #Loss of normal feedwater (LONF) #Risk-informed methodology #Time-dependent success criteria

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