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首页> 外文期刊>World Journal of Nuclear Science and Technology >Effect of Kinetic Parameters on I-129 Activity from Fuel to Coolant in PWRs
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Effect of Kinetic Parameters on I-129 Activity from Fuel to Coolant in PWRs

机译：动力学参数对PWR中燃料燃料I-129活性的影响

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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 style="white-space:nowrap;">−10% to +10% in the coolant purification rate constant ( style="white-space:nowrap;">Β), the activity variation after 200 days of reactor operation was 23.1% for the change.
机译：在这项工作中，研究了动力学模型参数对燃料到冷却剂的裂变产品（I-129）的影响。首先，使用Origen-2作为子程序开发用于裂变产物释放到初级冷却剂的计算模型。该模型基于动力学模型的微分方程集，包括燃料到间隙释放模型，间隙到冷却剂泄漏模型，以及展位扩散模型。基于MATLAB的计算机程序FPAPC（初级冷却剂中的裂变产品活性）开发。计算原发性传热系统I-129活性的变化，并且在良好的协议中发现了I-129的计算值，并且偏差在已发表的数据值的2％ - 3％以内。最后，研究了冷却剂净化速率，扩散恒定和气体逃逸率对I-129活性的影响，结果表明，冷却剂纯化速率是初级回路中裂变产品活性最敏感的参数。从<跨度样式=“空白空间：nowrap;”> - 冷却剂净化速率常数（<跨度样式=“空格：nowrap; “>β/跨>），改变200天后的活性变化为23.1％。

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