BEHAVIOR OF CHEMICALLY ACTIVE ORGANIC IMPURITIES IN SODIUM CIRCUITS

PROBLEMS OF ATOMIC SCIENCE AND TECHNOLOGY. SERIES: NUCLEAR AND REACTOR CONSTANTS Pub Date : 2021-12-26 DOI:10.55176/2414-1038-2021-4-154-161

Y. Zagorulko, N. Ganichev, M. Konovalov, V. Alekseev

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Abstract

Mineral oils and some other organic substances are employed as cooling-agents and lubricators of reactor equipment with movable parts. At normal operation condition these substances are able to penetrate into reactor protective gas plenum in vapor and aerosols forms. Due to their thermolysis and interaction with sodium there are produced hydrogen and different hydrocarbons species, that are detected usually in cover gas. Kinetic of the above processes is dependent on temperature conditions and with temperature increase from 350 to 500 °C the evolution of some hydrocarbons could rise up to 1-2 orders of magnitude. There were published notes on accidental ingress of oil in the primary circuit of fast reactor sodium coolant. Investigation results of such accidents simulation on the experimental sodium circuit are presented in the report. There are discussed results on kinetic of volatile hydrocarbons evolution from oil-pyrolysis products depositions on the circuit pipes walls and gas plenum surfaces. As well, different brands of oil are compared on their behavior in sodium environment.

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钠电路中化学活性有机杂质的行为

矿物油和其他一些有机物质被用作具有活动部件的反应堆设备的冷却剂和润滑剂。在正常操作条件下，这些物质能够以蒸汽和气溶胶的形式渗透到反应堆保护气体中。由于它们的热分解和与钠的相互作用，产生了氢和不同种类的碳氢化合物，这些碳氢化合物通常在盖气中检测到。上述过程的动力学取决于温度条件，当温度从350°C升高到500°C时，一些碳氢化合物的演化可以上升到1-2个数量级。关于快堆钠冷却剂一次回路中意外入油的报道已发表。本文还介绍了在实验钠电路上对此类事故进行模拟的调查结果。讨论了油热解产物沉积在回路管壁和气体静压室表面的挥发性烃演化动力学结果。并比较了不同牌号的油脂在钠环境中的行为。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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PROBLEMS OF ATOMIC SCIENCE AND TECHNOLOGY. SERIES: NUCLEAR AND REACTOR CONSTANTS

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