A phenomena identification ranking table (PIRT) was constructed to identify important phenomena that should be considered in simulating the accident progression for the Fukushima Dai-ichi nuclear power station and predicting the molten core and debris distribution in the reactor system with the MAAP code. The accident scenario, starting from reactor scram to PCV failure, was divided into four time phases in which fuel rod degradation, molten core relocation, and reactor vessel failure were selected as the phase-changing events. Phenomena that would have occurred in the accident were identified in the plant system including the reactor vessel and the containment that consist of 16 sub-components, consistent with the MAAP nodalization for the BWR system. The importance of the identified phenomena was evaluated for each time phase in cooperation with the experts in the Atomic Energy Society of Japan. Eventually total of 1047 phenomena were identified, of which 386 were ranked as ‘highly’ important for the analysis code to evaluate the behavior of molten fuel rods and reactor internal materials. These important phenomena are compared with those considered in the current MAAP analysis models to make sure what should be enhanced to improve the analysis capability for the accident progression.
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2013 21st International Conference on Nuclear Engineering
July 29–August 2, 2013
Chengdu, China
Conference Sponsors:
- Nuclear Engineering Division
ISBN:
978-0-7918-5583-6
PROCEEDINGS PAPER
Phenomena Identification Ranking Table (PIRT) for the MAAP Enhancement Project
Norio Sakai,
Norio Sakai
Toshiba Corporation, Yokohama, Kanagawa, Japan
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Hideki Horie,
Hideki Horie
Toshiba Corporation, Yokohama, Kanagawa, Japan
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Hiromasa Yanagisawa,
Hiromasa Yanagisawa
Toshiba Corporation, Yokohama, Kanagawa, Japan
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Tadashi Fujii,
Tadashi Fujii
Hitachi-GE Nuclear Energy, Ltd., Hitachi, Ibaraki, Japan
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Shinya Mizokami,
Shinya Mizokami
Tokyo Electric Power Company, Tokyo, Japan
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Koji Okamoto
Koji Okamoto
The University of Tokyo, Tokai, Ibaraki, Japan
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Norio Sakai
Toshiba Corporation, Yokohama, Kanagawa, Japan
Hideki Horie
Toshiba Corporation, Yokohama, Kanagawa, Japan
Hiromasa Yanagisawa
Toshiba Corporation, Yokohama, Kanagawa, Japan
Tadashi Fujii
Hitachi-GE Nuclear Energy, Ltd., Hitachi, Ibaraki, Japan
Shinya Mizokami
Tokyo Electric Power Company, Tokyo, Japan
Koji Okamoto
The University of Tokyo, Tokai, Ibaraki, Japan
Paper No:
ICONE21-16826, V006T15A024; 8 pages
Published Online:
February 7, 2014
Citation
Sakai, N, Horie, H, Yanagisawa, H, Fujii, T, Mizokami, S, & Okamoto, K. "Phenomena Identification Ranking Table (PIRT) for the MAAP Enhancement Project." Proceedings of the 2013 21st International Conference on Nuclear Engineering. Volume 6: Beyond Design Basis Events; Student Paper Competition. Chengdu, China. July 29–August 2, 2013. V006T15A024. ASME. https://doi.org/10.1115/ICONE21-16826
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