Analytical Method to Estimate Cross-Section Stress Profiles for Reactor Vessel Nozzle Corners under Internal Pressure
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This paper provides a simple method by which to estimate the cross-section stress profiles for nozzlesdesigned according to ASME Code Section III. Further, this method validates the effectiveness of earlierwork performed by the authors on standard nozzles. The method requires only the geometric informationof the pressure vessel and the attached nozzle. A PWR direct vessel injection nozzle, a PWR outletnozzle, a PWR inlet nozzle and a BWR recirculation outlet nozzle are selected based on their correspondingspecific designs, e.g., a varying nozzle radius, a varying nozzle thickness and an outlet nozzleboss. A cross-section stress profile comparison shows that the estimates are in good agreement with thefinite element analysis results. Differences in stress intensity factors calculated in accordance with ASMEBPVC Section XI Appendix G are discussed. In addition, a change in the dimensions of an alternate nozzledesign relative to the standard values is discussed, focusing on the stress concentration factors of thenozzle inside corner.
Abstract
This paper provides a simple method by which to estimate the cross-section stress profiles for nozzlesdesigned according to ASME Code Section III. Further, this method validates the effectiveness of earlierwork performed by the authors on standard nozzles. The method requires only the geometric informationof the pressure vessel and the attached nozzle. A PWR direct vessel injection nozzle, a PWR outletnozzle, a PWR inlet nozzle and a BWR recirculation outlet nozzle are selected based on their correspondingspecific designs, e.g., a varying nozzle radius, a varying nozzle thickness and an outlet nozzleboss. A cross-section stress profile comparison shows that the estimates are in good agreement with thefinite element analysis results. Differences in stress intensity factors calculated in accordance with ASMEBPVC Section XI Appendix G are discussed. In addition, a change in the dimensions of an alternate nozzledesign relative to the standard values is discussed, focusing on the stress concentration factors of thenozzle inside corner.
참고문헌 (22)
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