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首页> 外文会议>ICAPP 2008;International conference on advances in nuclear power plants >Neutronic study for introduction of Erbium as a burnable poison into the fuel cladding tube to enable PWR core control
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Neutronic study for introduction of Erbium as a burnable poison into the fuel cladding tube to enable PWR core control

机译：中子学研究，将as作为可燃毒物引入燃料包壳管，以实现压水堆堆芯控制

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In order to reduce the cost of electricity and to minimize the required Natural Uranium resources, increasing the cycle length and the fuel burn-up are an important issue. Specific studies have been initiated to evaluate the fuel behaviour and core loading to achieve burn-up greater than 70GWd/t (average burn-up of the most irradiated assembly). This strategy necessarily implies an increase of the initial reactivity reserve and consequently of the capability of the control systems to compensate this reserve at the beginning of the cycle. The soluble boron quantity can be increased but must be strictly less than a maximal limit to keep the moderator coefficient at a negative value. Burnable poisons, such as Gadolinium, are usually used together with soluble boron. The neutronic properties of the Gadolinium are well known, however, in order to limit the degradation of the pin thermo-mechanical properties (especially the thermal conductivity) in the presence of this absorber, the Gd content in the pellet is generally limited to 8%. Therefore, the use of Erbium has been proposed as an alternative poison to Gadolinium. The solution proposed consists in incorporating Er into the cladding tube. The Erbium has been introduced in a low alloyed zirconium matrix as an internal liner, to avoid the degradation of the outer corrosion of the cladding due to this element in a pressurized water environment. This paper describes mostly the neutronic results obtained with such concept. Compared to other poisons, the results shows that the erbium is the best suited to be inserted in the fuel cladding tubes. To obtain the best performances, it is preferable to load a low content of erbium in all the fuel cladding tubes of the sub-assembly (homogeneous poisoning). Compared to the actual reference poisoning with few gadolinium rods, the study underlines that the core radial power distribution can be easier optimised using our concept and the cycle length can be also increased. The use of enriched erbium increases these gains. The results of fabricated fuel cladding tubes with addition of few percents of erbium are also encouraging. A French CEA patent on this concept has been registerd.
机译：为了降低电力成本并最小化所需的天然铀资源，增加循环长度和燃料消耗是重要的问题。已经启动了专门的研究来评估燃料性能和堆芯负载，以实现燃耗大于70GWd / t（最受辐照组件的平均燃耗）。该策略必然意味着初始反应性储备的增加，并且因此意味着控制系统在循环开始时补偿该储备的能力。可溶硼的数量可以增加，但必须严格小于最大限值，以将调节剂系数保持在负值。 Ga等可燃毒物通常与可溶性硼一起使用。 d的中子性能是众所周知的，但是，为了限制在存在这种吸收剂的情况下销的热机械性能（特别是热导率）的降低，球团中的Gd含量通常限制为8％ 。因此，已提出使用Er作为Ga的替代毒物。提出的解决方案是将Er掺入包层管中。 avoid已被引入到低合金锆基体中作为内部衬里，以避免在加压水环境中由于这种元素而导致包层外部腐蚀的恶化。本文主要描述了用这种概念获得的中子学结果。与其他毒药相比，结果表明，the最适合插入燃料包壳管中。为了获得最佳性能，最好在子组件的所有燃料包层管中装入低含量的（（均质中毒）。与实际的reference元素很少的参考中毒相比，该研究强调，使用我们的概念可以更轻松地优化核心径向功率分布，并且还可以增加周期长度。浓缩的使用增加了这些收益。添加了百分之几的制成的燃料包壳管的结果也令人鼓舞。关于此概念的法国CEA专利已注册。

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