Studies on the optimal mitigation strategy of extended SBO for the isolated multi-unit NPP site. (15th December 2021)

• Record Type: Journal Article
• Authors: Alsuwaidi, Jamila Khamis; Kang, Hyun Gook; Yoon, Ho Joon
• Is Part Of: Annals of nuclear energy. Volume 164(2021)
• Publication Date: 2021-12-15
• Subjects: AAC-DG Alternative Alternating Current Diesel Generator -- AFWS Auxiliary Feed Water System -- AFWST Auxiliary Feedwater Storage Tank -- CBDTM Cause-Based Decision Tree Methodology -- CDF Core Damage Frequency -- CST Condensate Storage Tank -- DG Diesel Generator -- DSA Deterministic Safety Analysis -- DWST Demineralized Water Storage Tank -- EDG Emergency Diesel Generator -- Ex-SBO Extended Station Blackout -- FANR Federal Authority for Nuclear Regulation -- HEP Human Error Probability -- HRA Human Reliability Analysis -- KAERI Korea Atomic Energy Research Institute -- KU PRA model Khalifa University Probabilistic Risk Assessment model -- KUST Khalifa University of Science and Technology -- LOOP Loss of Offsite Power -- MARS Multi-dimensional Analysis for Reactor Safety -- MCR Main Control Room -- MFWS Main Feed Water System -- MLOOP Multi-unit LOOP -- MSBO Multi-unit SBO -- OPR1000 Optimized Power Reactor 1000 -- PCT Peak Cladding Temperature exceed 1204°C (1477 K) -- PRA Probabilistic Risk Assessment -- PSA Probabilistic Safety Assessment -- RCP Reactor Cooling Pump -- SBO Station Blackout -- SLOOP Single-unit LOOP -- SSBO Single-unit SBO -- TD-AFWP Turbine-Driven Auxiliary Feed Water Pump -- THERP Technique of Human Error Rate Prediction; Station Blackout -- SBO -- Crosstie -- PRA -- PSA -- Isolated site; Nuclear energy -- Periodicals; Nuclear engineering -- Periodicals; 621.4805
• DOI: 10.1016/j.anucene.2021.108615
• Languages: English
• ISSNs: 0306-4549

Abstract

Highlights: The coping time can be maximized by the optimal strategy with proper operator's actions. We proposed the resources-based mitigation strategy framework based on PSA and DSA. 14 cases were investigated in terms of available four resources. The success criteria of PSA need to be updated with the coping time analysis. The probabilistic model guided by DSA shows the reduction of total CDF and SBO-CDF. Abstract: The Nuclear Power Plant in the isolated Multi-Unit site eventually reaches the core damage if it undergoes the extended Station Blackout with the depletion of available resources. However, the coping time can be maximized by the optimal strategy with proper operator's actions so that the operator can prepare further mitigation action to prevent core damage. The resources-based mitigation strategy framework was developed from the insights of the probabilistic model and deterministic model, which consider monitoring of plant conditions, available decay heat removal systems, available power sources, and water sources depending on the time. The maximum coping time is estimated for various cases with MARS-KS1.4 code for APR1400 and combined with a corresponding probabilistic model for each accident sequence based on the accident conditions and the resources with additional human actions.