The System Based Code (SBC) concept has been proposed to achieve compatibility in matters of reliability, safety, and cost of Fast Breeder Reactors (FBR). This code extends the present structural design standard to include the areas of load setting, fabrication, inspection, maintenance, and so on. Therefore, a quantitative index which can connect different areas is required. In addition, the determination of its target value is also one of the key points to substantiate the SBC concept. Failure probability is one of the candidate indexes. We have proposed a new method to determine the reliability targets for the structures and components in FBR plants from the safety point of view by utilizing analysis models of a probabilistic safety assessment. In this study, the effectiveness of the failure probability as an index and the compatibility of the reliability targets derived by the new method were investigated through a trial setting of In-Service Inspection (ISI) request on the reactor vessel near the sodium surface based on the SBC concept. The failure probability due to creep-fatigue interaction was calculated by the Monte-Carlo simulation. In response, the reliability targets for fracture related to the risk from internal initiating events were derived. Cumulating the failure probability and the reliability targets up to the end of in-service period enables us to compare them directly, and we obtained a result that the reactor vessel has enough reliability even without ISI. Through this trial, we showed that the failure probability is a promising index, and the reliability targets derived by the new method are compatible with the SBC concept.
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18th International Conference on Nuclear Engineering
May 17–21, 2010
Xi’an, China
Conference Sponsors:
- Nuclear Engineering Division
ISBN:
978-0-7918-4934-7
PROCEEDINGS PAPER
Development of System Based Code: Part 2—Application of Reliability Target for Configuration of ISI Request
Shigeru Takaya,
Shigeru Takaya
Japan Atomic Energy Agency, Oarai, Ibaraki, Japan
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Satoshi Okajima,
Satoshi Okajima
Japan Atomic Energy Agency, Oarai, Ibaraki, Japan
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Kenich Kurisaka,
Kenich Kurisaka
Japan Atomic Energy Agency, Oarai, Ibaraki, Japan
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Tai Asayama,
Tai Asayama
Japan Atomic Energy Agency, Oarai, Ibaraki, Japan
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Hideo Machida,
Hideo Machida
Tepco Systems Corporation, Tokyo, Japan
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Yoshio Kamishima
Yoshio Kamishima
Mitsubishi FBR Systems, Inc., Tokyo, Japan
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Shigeru Takaya
Japan Atomic Energy Agency, Oarai, Ibaraki, Japan
Satoshi Okajima
Japan Atomic Energy Agency, Oarai, Ibaraki, Japan
Kenich Kurisaka
Japan Atomic Energy Agency, Oarai, Ibaraki, Japan
Tai Asayama
Japan Atomic Energy Agency, Oarai, Ibaraki, Japan
Hideo Machida
Tepco Systems Corporation, Tokyo, Japan
Yoshio Kamishima
Mitsubishi FBR Systems, Inc., Tokyo, Japan
Paper No:
ICONE18-29657, pp. 413-418; 6 pages
Published Online:
April 8, 2011
Citation
Takaya, S, Okajima, S, Kurisaka, K, Asayama, T, Machida, H, & Kamishima, Y. "Development of System Based Code: Part 2—Application of Reliability Target for Configuration of ISI Request." Proceedings of the 18th International Conference on Nuclear Engineering. 18th International Conference on Nuclear Engineering: Volume 6. Xi’an, China. May 17–21, 2010. pp. 413-418. ASME. https://doi.org/10.1115/ICONE18-29657
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