Assessment of CCFL Model of RELAP5/MOD3 Against Simple Vertical Tubes and Rod Bundle Tests (NUREG/IA-0100)

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Publication Information

Date Published: June 1993

Prepared by:
S. Cho, N. Arne, Korea Electric Power Corporation, Research Center
B. D. Chung, H. J. Kim, Korea Institute of Nuclear Safety

Korea Electric Power Corporation, Research Center
117–15 Yongjeon–Dong
Taejon, Korea

Korea Institute of Nuclear Safety
P. O. Box 16
Taejon, Korea, 305–353

Prepared as part of:
The Agreement on Research Participation and Technical Exchange
under the International Thermal-Hydraulic Code Assessment
and Application Program (ICAP)

Office of Nuclear Regulatory Research
U.S. Nuclear Regulatory Commission
Washington, DC 20555-0001

Availability Notice


The CCFL model used in RELAP5/MOD3 version 5m5 has been assessed against simple vertical tubes and rod bundle tests performed at a facility of Korea Atomic Energy Research Institute.

The effect of changes in tube diameter and nodalization of tube section were investigated. The roles of interfacial drags on the flooding characteristics are discussed. Differences between the calculation and the experiment are also discussed.

A comparison between model assessment results and the test data showed that the calculated value lay well on the experimental flooding curve specified by user, but the pressure jump before onset of flooding was not calculated.

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