International Standard Problem No. 50: ATLAS Test, SB-DVI-09 (Volume I)

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This report describes final prediction results by system analysis codes during the OECD/NEA ISP-50 exercise, targeting a 50% direct vessel injection (DVI) line break integral effect test performed with the Advanced Thermal-hydraulic Test Loop for Accident Simulation (ATLAS), which is operated by the Korea Atomic Energy Research Institute (KAERI) for accident
simulations of advanced pressurised water reactors (PWRs). This ISP-50 exercise was performed in two consecutive phases: “blind” and “open” phases. The main objectives of the blind phase were to assess capability of the current leading safety analysis codes in reproducing the overall thermal-hydraulic phenomena for the DVI line break scenario and to investigate how much “user effects” the safety analysis codes have. The open phase aimed at assessing prediction capability of the multi-dimensional behavior observed in the ISP-50 test, especially in the upper annulus downcomer region and examining how much the “user effects” can be reduced for given integral effect data. In addition, limitation of the current safety analysis codes was investigated and directions where further code improvement is required were suggested.

The present document, International Standard Problem No. 50: ATLAS Test, SB-DVI-09: 50% (6-inch) Break of DVI Line of the APR1400 – Final Integration Report, consists of Volume I: Analysis of Blind/Open Calculations.