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Environmental Fatigue Evaluation of Top-Mounted In-Core Instrumentation Nozzle
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 Title & Authors
Environmental Fatigue Evaluation of Top-Mounted In-Core Instrumentation Nozzle
Yoon, Hyo-Sub; Kim, Jong-Min; Maeng, Cheol-Soo; Kim, Gee-Seok; Kim, Hyun-Min;
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 Abstract
The development of Top-Mounted In-Core Instrumentation(TM-ICI) is an ongoing project to reduce the risk due to severe accidents by inserting the instrumentation into a reactor closure head instead of a reactor bottom head. As part of this project, environmental fatigue analyses for TM-ICI nozzle have been performed using two methods of NUREG/CR-6909 and Code Case N-761. TM-ICI nozzle is subjected to transient loads for level A, level B and test conditions that should be evaluated for a fatigue analysis. It is found that a cumulative usage factor considering reactor coolant environment for TM-ICI nozzle is evaluated as less than 1, which is ASME Code allowable criteria of a fatigue analysis.
 Keywords
reactor pressure vessel;top-mounted in-core instrumentation nozzle;environmental fatigue evaluation;
 Language
Korean
 Cited by
 References
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