United States Nuclear Regulatory Commission - Protecting People and the Environment

Assessment of RELAP5/MOD3.1 for Gravity-Driven Injection Experiment in the Core Makeup Tank of the CARR Passive Reactor (CP-1300) (NUREG/IA-0134, CAMP005)

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Publication Information

Date Published: October 1996

Prepared by:
Sang Il Lee, Hee Cheon No, KAIST
Young Seok Bang, Hho Jung Kim, KINS

Korea Advanced Institute of Science and Technology
Nuclear Engineering Department
373–1, Gusung-Dong
Yusung, Taejon
305-701 Korea

Korea Institute of Nuclear Safety
Advanced Reactor Dept.
P.O. Box 114
Yusung, Taejon
305–600 Korea

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

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

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Abstract

The objective of the present work is to improve the analysis capability of RELAP5/MOD3.1 on the direct contact condensation in the core makeup tank(CMT) of passive high-pressure injection system(PHPIS) in the CARR Passvie Reactor(CP-1300). The gravity-driven injection experiment is conducted by using a small scale test facility to identify the parameters having significant effects on the gravity-driven injection and the major condensation modes. It turns out that the larger the water subcooling is, the more the initiation of injection is delayed, and the sparger and the natural circulation of the hot water from the steam generator accelerate the gravity-driven injection. The condensation modes are divided into three modes: sonic jet, subsonic jet, and steam cavity. RELAP5/MOD3.1 is chosen to evaluate the code predictability on the direct contact condensation in the CMT. It is found that the predictions of MOD3.1 are in better agreement with the experimental data than those of MOD3.0. From the nodalization study of the test section, the 1- node model shows better agreement with the experimental data than the multi- node models. RELAP5/MOD3.1 identifies the flow regime of the test section as vertical stratification. However, the flow regime observed in the experiment is the subsonic jet with the bubble having the vertical cone shape. To accurately predict the direct contact condensation in the CMT with RELAP5/MOD3.1, it is essential that a new set of the interfacial heat transfer coefficients and a new flow regime map for direct contact condensation in the CMT be developed.

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