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Title: Experiment and RELAP5 Analysis for the Downcomer Boiling of APR1400 under LBLOCA

Abstract

The direct vessel injection (DVI) mode of a safety injection system is adopted instead of a conventional cold leg injection (CLI) mode as one of the advanced design features of the APR1400 (Advanced Power Reactor 1400 MW). From the calculation results of RELAP5 with full plant, it is found out that the sudden boiling happens in the downcomer due to heat transfer from the reactor vessel wall and it can affect the reactor safety. In the present study, experimental tests are carried out to observe the actual boiling phenomena in the downcomer and to validate RELAP5. The heated wall of test section has its thickness of 8.2 cm and the same material as the prototype (APR1400) with chrome coating against rusting. From the experiment, we visually observe the vapor jetting near the heated wall with small bubble migration to the bulk region and liquid circulation. The data shows a rapid wall temperature drop generating a large amount of vapor initially. The calculation results of RELAP5 using the three nodal schemes are compared with experimental ones in aspects of water level, void fraction, wall temperatures and phase velocities. It turns out that the double nodal scheme with circulation produces better resultsmore » than the nodal scheme without circulation to simulate the boiling phenomena in the downcomer. (authors)« less

Authors:
; ;  [1];  [2];  [3]
  1. Korea Advanced Institute of Science and Technology, Gusong-Dong, Yusong-Gu 373-1, Daejon (Korea, Republic of)
  2. Korea Hydraulic and Nuclear Power Co., 103-16, Munji-dong, Yuseong-gu, Daejeon, 305-380 (Korea, Republic of)
  3. Korea Atomic Energy Research Institute, Yuseong-gu P.O. Box 105, Daejeon, 305-600 (Korea, Republic of)
Publication Date:
Research Org.:
American Nuclear Society, 555 North Kensington Avenue, La Grange Park, IL 60526 (United States)
OSTI Identifier:
21160655
Resource Type:
Conference
Resource Relation:
Conference: ICAPP'04: 2004 international congress on advances in nuclear power plants, Pittsburgh, PA (United States), 13-17 Jun 2004; Other Information: Country of input: France; 3 refs; Related Information: In: Proceedings of the 2004 international congress on advances in nuclear power plants - ICAPP'04, 2338 pages.
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING; BOILING; BUBBLES; DESIGN; HEAT TRANSFER; LIQUIDS; PHASE VELOCITY; POWER REACTORS; REACTOR SAFETY; REACTOR VESSELS; SAFETY INJECTION; VAPORS; VOID FRACTION; WALLS

Citation Formats

Lee, Dong Won, No, Hee Cheon, Lee, Eu Hwak, Oh, Seung Jong, and Song, Chul-Hwa. Experiment and RELAP5 Analysis for the Downcomer Boiling of APR1400 under LBLOCA. United States: N. p., 2004. Web.
Lee, Dong Won, No, Hee Cheon, Lee, Eu Hwak, Oh, Seung Jong, & Song, Chul-Hwa. Experiment and RELAP5 Analysis for the Downcomer Boiling of APR1400 under LBLOCA. United States.
Lee, Dong Won, No, Hee Cheon, Lee, Eu Hwak, Oh, Seung Jong, and Song, Chul-Hwa. 2004. "Experiment and RELAP5 Analysis for the Downcomer Boiling of APR1400 under LBLOCA". United States.
@article{osti_21160655,
title = {Experiment and RELAP5 Analysis for the Downcomer Boiling of APR1400 under LBLOCA},
author = {Lee, Dong Won and No, Hee Cheon and Lee, Eu Hwak and Oh, Seung Jong and Song, Chul-Hwa},
abstractNote = {The direct vessel injection (DVI) mode of a safety injection system is adopted instead of a conventional cold leg injection (CLI) mode as one of the advanced design features of the APR1400 (Advanced Power Reactor 1400 MW). From the calculation results of RELAP5 with full plant, it is found out that the sudden boiling happens in the downcomer due to heat transfer from the reactor vessel wall and it can affect the reactor safety. In the present study, experimental tests are carried out to observe the actual boiling phenomena in the downcomer and to validate RELAP5. The heated wall of test section has its thickness of 8.2 cm and the same material as the prototype (APR1400) with chrome coating against rusting. From the experiment, we visually observe the vapor jetting near the heated wall with small bubble migration to the bulk region and liquid circulation. The data shows a rapid wall temperature drop generating a large amount of vapor initially. The calculation results of RELAP5 using the three nodal schemes are compared with experimental ones in aspects of water level, void fraction, wall temperatures and phase velocities. It turns out that the double nodal scheme with circulation produces better results than the nodal scheme without circulation to simulate the boiling phenomena in the downcomer. (authors)},
doi = {},
url = {https://www.osti.gov/biblio/21160655}, journal = {},
number = ,
volume = ,
place = {United States},
year = {Thu Jul 01 00:00:00 EDT 2004},
month = {Thu Jul 01 00:00:00 EDT 2004}
}

Conference:
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