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Sodium Purification Systems: requirements, tools and qualification Strategies

机译：钠净化系统：要求，工具和资格策略

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In order to operate a Sodium Fast Reactor in reliable and safe conditions, the quality of the coolant must be mastered. The chemical control of sodium is performed versus the different chemical compounds: oxygen (corrosion control), hydrogen (detection of the sodium-water reaction) and to a lesser degree, carbon (carburization, decarburization phenomena). Furthermore, other detrimental effects could be avoided: plugging of narrow sections, loss of heat transfer efficiency in heat exchangers, contamination and dosimetry, …Oxygen and moisture are introduced mainly during handling operations, hydrogen is due to aqueous corrosion of the Steam Generator Unit and thermal decomposition of hydrazine, used to control the oxygen content in the water. The purification of oxygen and hydrogen is adequately performed thanks to cold traps and mainly due to the fact that the solubilities are nearly nil for temperatures close to the fusion point, i.e. 97.8°C. This paper deals with the development of purification systems for the primary and intermediate circuits of an SFR. Based on previous studies related to the basic mechanisms of Na_2O and NaH crystallization and on operational feedback from French Reactors, new concepts of cold traps were developed for Superphenix and EFR. In order to design new cold traps, a new computer tool has been developed, predicting the location and the amount of impurities deposited on cold walls for NaH and on wire mesh packing for NaH and Na_2O. This model helps the engineer developing a pre-conceptual design and assists the operator in following the filling rate of the cold trap, thereby avoiding long experimental tests in sodium facilities and reducing the cost of cold trap qualification strategies.
机译：为了操作的可靠和安全的条件下钠冷快堆，冷却水的质量必须要掌握。进行相对于不同的化学化合物的钠的化学控制：氧气（腐蚀控制），氢气（检测的钠 - 水反应的），并在较小程度上，碳（渗碳，脱碳现象）。此外，可避免其它有害效应：窄的部分，在热交换器中，污染和剂量，...氧气的热传递效率损失的堵塞和湿气主要介绍处理操作过程中，氢是由于蒸汽发生器单元和的水溶液腐蚀肼的热分解，用于控制在水中的氧含量。氧和氢的净化得以充分进行由于冷阱和主要是由于这样的事实的溶解度几乎为零对于温度接近熔点，即97.8℃。本文使用净化系统的发展，为的SFR的主要和中间电路的交易。根据以往的相关Na_2O和氢化钠结晶的基本机制，并从法国反应堆运行反馈的研究中，冷阱的新概念为Superphenix和EFR被开发。为了设计新的冷阱，一台新电脑工具已经被开发出来，预测的位置和杂质沉积冰冷的墙壁为氢化钠和金属丝网填料为氢化钠和Na_2O的量。该模型能帮助工程师开发前期概念设计，并协助运营商在以下的冷阱的充填率，从而避免了钠长设施的实验测试，并减少冷阱资格策略的成本。

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