The structural integrity of a reactor pressure vessel (RPV) is important for the safety of a nuclear power plant. When the emergency core cooling system (ECCS) is operated and the coolant water is injected into the RPV due to a loss-of-coolant accident (LOCA), the pressurized thermal shock (PTS) loading takes place. With the neutron irradiation, PTS loading may lead an RPV to fracture. Therefore, it is necessary to evaluate the performance of RPV during PTS loading to keep the reactor safety. In the present study, optimization of RPV maintenance is considered, where two different attempts are made to investigate the RPV integrity during PTS loading by employing the deterministic and probabilistic methodologies. For the deterministic integrity evaluation, three-dimensional computational fluid dynamics (3D-CFD) and finite element method (FEM) simulations are performed, and stress intensity factors (SIFs) are obtained as a function of crack position inside the RPV. As to the probabilistic integrity evaluation, on the other hand, a practically more useful spatial distribution of SIF on the RPV is calculated. By comparing the distribution thus obtained with the fracture toughness included as a part of the master curve, the dependence of conditional failure probabilities on the position inside the RPV is obtained. Using the spatial distribution of conditional failure probabilities in RPV, the priority of the inspection and maintenance is finally discussed.
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October 2018
Research-Article
An Investigation of the Structural Integrity of a Reactor Pressure Vessel Using Three-Dimensional Computational Fluid Dynamics and Finite Element Method Based Probabilistic Pressurized Thermal Shock Analysis for Optimizing Maintenance Strategy
Xiaoyong Ruan,
Xiaoyong Ruan
Graduate School of Energy Science,
Kyoto University,
Gokasho,
Uji, Kyoto 611-0011, Japan
e-mail: x-ruan@iae.kyoto-u.ac.jp
Kyoto University,
Gokasho,
Uji, Kyoto 611-0011, Japan
e-mail: x-ruan@iae.kyoto-u.ac.jp
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Toshiki Nakasuji,
Toshiki Nakasuji
Graduate School of Energy Science,
Kyoto University,
Gokasho,
Uji, Kyoto 611-0011, Japan
e-mail: t-nakasuji@iae.kyoto-u.ac.jp
Kyoto University,
Gokasho,
Uji, Kyoto 611-0011, Japan
e-mail: t-nakasuji@iae.kyoto-u.ac.jp
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Kazunori Morishita
Kazunori Morishita
Institute of Advanced Energy,
Kyoto University,
Gokasho,
Uji, Kyoto 611-0011, Japan
e-mail: morishita@iae.kyoto-u.ac.jp
Kyoto University,
Gokasho,
Uji, Kyoto 611-0011, Japan
e-mail: morishita@iae.kyoto-u.ac.jp
Search for other works by this author on:
Xiaoyong Ruan
Graduate School of Energy Science,
Kyoto University,
Gokasho,
Uji, Kyoto 611-0011, Japan
e-mail: x-ruan@iae.kyoto-u.ac.jp
Kyoto University,
Gokasho,
Uji, Kyoto 611-0011, Japan
e-mail: x-ruan@iae.kyoto-u.ac.jp
Toshiki Nakasuji
Graduate School of Energy Science,
Kyoto University,
Gokasho,
Uji, Kyoto 611-0011, Japan
e-mail: t-nakasuji@iae.kyoto-u.ac.jp
Kyoto University,
Gokasho,
Uji, Kyoto 611-0011, Japan
e-mail: t-nakasuji@iae.kyoto-u.ac.jp
Kazunori Morishita
Institute of Advanced Energy,
Kyoto University,
Gokasho,
Uji, Kyoto 611-0011, Japan
e-mail: morishita@iae.kyoto-u.ac.jp
Kyoto University,
Gokasho,
Uji, Kyoto 611-0011, Japan
e-mail: morishita@iae.kyoto-u.ac.jp
1Corresponding author.
Contributed by the Pressure Vessel and Piping Division of ASME for publication in the JOURNAL OF PRESSURE VESSEL TECHNOLOGY. Manuscript received July 25, 2017; final manuscript received June 22, 2018; published online August 22, 2018. Assoc. Editor: Tomoyo Taniguchi.
J. Pressure Vessel Technol. Oct 2018, 140(5): 051302 (10 pages)
Published Online: August 22, 2018
Article history
Received:
July 25, 2017
Revised:
June 22, 2018
Citation
Ruan, X., Nakasuji, T., and Morishita, K. (August 22, 2018). "An Investigation of the Structural Integrity of a Reactor Pressure Vessel Using Three-Dimensional Computational Fluid Dynamics and Finite Element Method Based Probabilistic Pressurized Thermal Shock Analysis for Optimizing Maintenance Strategy." ASME. J. Pressure Vessel Technol. October 2018; 140(5): 051302. https://doi.org/10.1115/1.4040698
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