OECD International Standard Problem ISP-50 on the ATLAS DVI Line Break Test
NURETH-14 - 2011 September 25-30

Presented at:
2011 September 25-30
Toronto, Canada
Session Title:
B3-4 Core Thermalhydraulics and Subchannel Analysis

Ki-Yong Choi (Korea Atomic Energy Research Institute)
Won-Pil Baek (Korea Atomic Energy Research Institute)
Hyun-Sik Park (Korea Atomic Energy Research Institute)
Seok Cho (Korea Atomic Energy Research Institute)
Kyoung-Ho Kang (Korea Atomic Energy Research Institute)
Yeon-Sik Kim (Korea Atomic Energy Research Institute)


An international standard problem (ISP) exercise, ISP-50 was progressed with the Advanced

Thermal-Hydraulic Test Loop for Accident Simulation (ATLAS) integral effect test results on

50% break of the cross section of a Direct Vessel Injection (DVI) nozzle of the APR1400. This

exercise consisted of two serial phases: blind and open calculation. In the open calculation, a

total of 16 calculations was collected from 11 organizations and seven leading safety analysis

codes were used, including APROS, ATHLET, KORSAR, MARS-KS, RELAP5/MOD3,

CATHARE, and TRACE. Local 3-D phenomena such as a down-comer mixing, a radial peak

cladding temperature (PCT) distribution, and an asymmetric inventory distribution were

highlighted in this exercise. Overall progress of the ISP-50 is outlined in this paper.

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