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Title: Development of methodology to optimize management of failed fuels in light water reactors
Authors: Yamamoto, Yasunori
Morishita, Kazunori
Author's alias: 森下, 和功
Keywords: fuel cladding
Monte Carlo method
safety assessment
fuel failure
Issue Date: 17-Nov-2014
Publisher: Taylor & Francis Group
Journal title: Journal of Nuclear Science and Technology
Volume: 52
Issue: 5
Start page: 709
End page: 716
Abstract: Fuel cladding is one of the key components in a fission reactor that confines radioactive materials inside a fuel tube. During reactor operation, however, cladding is sometimes breached, and radioactive materials leak from the fuel pellet into the coolant water through the breach. The primary coolant water is therefore monitored so that any leak is quickly detected; coolant water is periodically sampled, and the concentration of radioactive iodine 131 (I-131), for example, is measured. Depending on the measured leakage concentration, the faulty fuel assembly with leaking rod is removed from the reactor and replaced immediately or at the next refueling. In the present study, an effort has been made to develop a methodology to optimize the management for replacement of faulty fuel assemblies due to cladding failures using measured leakage concentration. A model numerical equation is proposed to describe the time evolution of an increase in I-131 concentration due to cladding failures and is then solved using the Monte Carlo method as a function of sampling rate. Our results indicate that, to achieve rationalized management of failed fuels, higher resolution to detect a small amount of I-131 is not necessarily required, but more frequent sampling is favorable.
Rights: This is an Accepted Manuscript of an article published by Taylor & Francis in 'Journal of Nuclear Science and Technology', available online:
The full-text file will be made open to the public on 17 Nov 2015 in accordance with publisher's 'Terms and Conditions for Self-Archiving'
This is not the published version. Please cite only the published version. この論文は出版社版でありません。引用の際には出版社版をご確認ご利用ください。
DOI(Published Version): 10.1080/00223131.2014.979901
Appears in Collections:Journal Articles

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