Analysis was performed for a large-break loss-of-coolant accident (LOCA) in the APR1400 (Advanced Power Reactor 1400 MWe) with the thermal-hydraulic analysis code RELAP5/ MOD3.2.2 and the severe accident analysis code MAAP4.03. The two codes predicted different sequences for essentially the same initiating condition. As for the break flow and the emergency core cooling (ECC) flow rates, MAAP4.03 predicted considerably higher values in the initial stage than RELAP5/ MOD3.2.2. It was considered that the differing break flow and ECC flow rates would cause the LOCA sequences to deviate from one another between the two codes. Hence, the break flow model in MAAP4.03 was modified with partly implementing the two-phase homogeneous critical flow model and adopting a correction term. The ECC flow model in MAAP4.03 was also varied by changing the hardwired friction factor through the sensitivity study. The modified break flow and ECC flow models yielded more consistent calculational results between RELAP5/MOD3.2.2 and MAAP4.03. It was, however, found that the resultant effect is rather limited unless more mechanistic treatments are done for the primary system in MAAP4.03.
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10th International Conference on Nuclear Engineering
April 14–18, 2002
Arlington, Virginia, USA
Conference Sponsors:
- Nuclear Engineering Division
ISBN:
0-7918-3597-9
PROCEEDINGS PAPER
Comparative Study of Loss-of-Coolant Accident Using MAAP4.03 and RELAP5/MOD3.2.2 Available to Purchase
Chang Hwan Park,
Chang Hwan Park
Seoul National University, Seoul, Korea
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Doo Yong Lee,
Doo Yong Lee
Seoul National University, Seoul, Korea
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Ik Jeong,
Ik Jeong
Seoul National University, Seoul, Korea
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Un Chul Lee,
Un Chul Lee
Seoul National University, Seoul, Korea
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Kune Y. Suh,
Kune Y. Suh
Seoul National University, Seoul, Korea
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Goon Cherl Park
Goon Cherl Park
Seoul National University, Seoul, Korea
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Chang Hwan Park
Seoul National University, Seoul, Korea
Doo Yong Lee
Seoul National University, Seoul, Korea
Ik Jeong
Seoul National University, Seoul, Korea
Un Chul Lee
Seoul National University, Seoul, Korea
Kune Y. Suh
Seoul National University, Seoul, Korea
Goon Cherl Park
Seoul National University, Seoul, Korea
Paper No:
ICONE10-22439, pp. 729-733; 5 pages
Published Online:
March 4, 2009
Citation
Park, CH, Lee, DY, Jeong, I, Lee, UC, Suh, KY, & Park, GC. "Comparative Study of Loss-of-Coolant Accident Using MAAP4.03 and RELAP5/MOD3.2.2." Proceedings of the 10th International Conference on Nuclear Engineering. 10th International Conference on Nuclear Engineering, Volume 3. Arlington, Virginia, USA. April 14–18, 2002. pp. 729-733. ASME. https://doi.org/10.1115/ICONE10-22439
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