Development of a Two-stage DQFM to Improve Efficiency of Single- and Multi-Hazard Risk Quantificationfor Nuclear Facilities

Energies

Shinyoung Kwag¹  Eujeong Choi²  Daegi Hahm²  Jeong-Gon Ha² 

[1] Department of Civil and Environmental Engineering, Hanbat National University, 125 Dongseo-daero, Yuseong-gu, Daejeon 34158, Korea;Structural Safety and Prognosis Research Division, Korea Atomic Energy Research Institute (KAERI), Daejeon 34057, Korea;

关键词: single hazard;    multi-hazard;    risk quantification;    nuclear power plant (NPP);    direct quantification of the fault tree using Monte Carlo simulation (DQFM);   

DOI  :  10.3390/en14041017

来源: DOAJ

【 摘 要 】

The probabilistic safety assessment (PSA) of a nuclear power plant (NPP) under single and multiple hazards is one of the most important tasks for disaster risk management of nuclear facilities. To date, various approaches—including the direct quantification of the fault tree using the Monte Carlo simulation (DQFM) method—have been employed to quantify single- and multi-hazard risks to nuclear facilities. The major advantage of the DQFM method is its applicability to a partially correlated system. Other methods can represent only an independent or a fully correlated system, but DQFM can quantify the risk of partially correlated system components by the sampling process. However, as a sampling-based approach, DQFM involves computational costs which increase as the size of the system and the number of hazards increase. Therefore, to improve the computational efficiency of the conventional DQFM, a two-stage DQFM method is proposed in this paper. By assigning enough samples to each hazard point according to its contribution to the final risk, the proposed two-stage DQFM can effectively reduce computational costs for both single- and multi-hazard risk quantification. Using examples of single- and multi-hazard threats to nuclear facilities, the effectiveness of the proposed two-stage DQFM is successfully demonstrated. Especially, two-stage DQFM saves computation time of conventional DQFM up to 72% for multi-hazard example.

【 授权许可】

Unknown