An analysis method for the fuel rod gap inventory of unstable fission products during steady-state operation

Koo, Yang-Hyun; Sohn, Dong-Seong; Yoon, Young-Ku

doi:10.1016/0022-3115(94)90248-8

Cited by 15 publications

(4 citation statements)

References 25 publications

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“…Whereas for piping, thermal expansion stresses including concentration effects are explicitly evaluated against relevant limits through Eqs. (10)(11), see NC-3653.2, which is a control on fatigue. From this point of view, it is not appropriate to apply NC-3200 Alternative Design Rules for Vessels for Class 2/3 piping.…”

Section: Non-linear Design Evaluationmentioning

confidence: 99%

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Nuclear Power - System Simulations and Operation

Tsvetkov¹

2011

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Statements and opinions expressed in the chapters are these of the individual contributors and not necessarily those of the editors or publisher. No responsibility is accepted for the accuracy of information contained in the published articles. The publisher assumes no responsibility for any damage or injury to persons or property arising out of the use of any materials, instructions, methods or ideas contained in the book.

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Section: Non-linear Design Evaluationmentioning

confidence: 99%

“…They escape from the ceramic pellets into the gap between pellets and the clad regions. Hyun et al [10] have developed an analytic method for the fuel rod gap inventory of unstable fission products during steady state operation of PWRs. The fission gas bubbles escape from grain corners and are interlinked in the open space.…”

Section: Introductionmentioning

confidence: 99%

Nuclear Power - System Simulations and Operation

Tsvetkov¹

2011

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“…When the failed fuel fraction exceeds a safe limit, replacement of defective assemblies becomes necessary. The total fission product activity can become available source to escape into the environment [6] [7] [8]. An analytic procedure to estimate the fission products leakage into the gap was suggested in past [8].…”

Section: Introductionmentioning

confidence: 99%

“…The total fission product activity can become available source to escape into the environment [6] [7] [8]. An analytic procedure to estimate the fission products leakage into the gap was suggested in past [8]. In this method, it was assumed that the radionuclides can escape from the grain corners and leak into the gap.…”

Section: Introductionmentioning

confidence: 99%

Effect of Kinetic Parameters on I-129 Activity from Fuel to Coolant in PWRs

Nasir¹

2017

WJNST

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Effect of kinetic model parameters on fission product (I-129) activity from fuel to coolant in PWRs has been studied in this work. First a computational model was developed for fission product release into primary coolant using ORIGEN-2 as subroutine. The model is based on set of differential equations of kinetic model which includes fuel-to-gap release model, gap-to-coolant leakage model, and Booths diffusion model. A Matlab based computer program FPAPC (Fission Product Activity in Primary Coolant) was developed. Variations of I-129 activity in Primary Heat Transport System were computed and computed values of i-129 were found in good agreement and deviations were within 2%-3% of already published data values. Finally, the effects of coolant purification rate, diffusion constant and gas escape rate on I-129 activity were studied and results indicated that the coolant purification rate is the most sensitive parameter for fission product activity in primary circuit. For changes of 5% in steps from −10% to +10% in the coolant purification rate constant (β), the activity variation after 200 days of reactor operation was 23.1% for the change.

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