Evaluation of the effect of ion exchange resin on feeder integrity

离子交换树脂对进料器完整性影响的评估

• 批准号: 528048-2018
• 负责人: Cook, William
• 金额: $ 3.82万
• 依托单位: University of New Brunswick
• 依托单位国家: 加拿大
• 项目类别: Collaborative Research and Development Grants
• 财政年份: 2020
• 资助国家: 加拿大
• 起止时间: 2020-01-01 至 2021-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=697563
• 关键词: Evaluation; effect; ion; exchange; resin

Point Lepreau Nuclear Generating Station (PLNGS) has installed an online hydrogen effusion monitor (HEPro from CNER at UNB) on an outlet feeder to monitor the hydrogen permeation rate and hence the rate of feeder thinning. Initial results have shown that the general corrosion rate of the higher chromium feeders installed during the refurbishment outage is significantly lower than the previously installed low chromium pipes. Monitoring the rate of hydrogen effusion has shown that the probe is sensitive to chemistry changes in the primary heat transport system (e.g. the introduction of low concentrations of dissolved oxygen during fueling). One of these recent observations was a significant increase (more than double) in the hydrogen effusion rate following the installation of a fresh, lithiated IX resin bed in the PHT purification circuit. The observation suggests that the feeder thinning rate changed significantly due to this chemistry change. The elevated corrosion rate (still much lower than pre-refurbishment) persisted for a month, until a planned outage and resumed at the higher rate following plant restart but has since been decreasing. Preliminary calculations suggest that the fresh ion exchange resin is removing iron from solution at a fast enough rate to significantly influence the degree of under-saturation at the core outlet and hence change the flow accelerated corrosion rate. The objective of this project is to evaluate the influence of current ion exchange resin practices on feeder integrity and to determine if the resin mixtures in use can be optimized to lower the amount of iron being removed from solution while meeting activity transport requirements. The scope includes a full analysis of the PLNGS HEPro data (2006 - present) to evaluate the link between ion exchange resin practices and FAC rates. A secondary aspect of this work will further evaluate the absorption characteristics of ion exchange resins for iron species and for film forming amines that may be used as additives to the station's secondary system.

Point Lepreau核发电站（PLNGS）已在出口馈线上安装了在线氢积液监测仪（来自CNER的HEPRO），以监视氢渗透率，从而监视进料器变薄的速度。最初的结果表明，翻新中安装的较高铬馈线的一般腐蚀速率显着低于先前安装的低铬管。监测氢积液的速率表明，探针对主要热传输系统的化学变化敏感（例如，在加油过程中引入低浓度的溶解氧）。这些最近的观察结果之一是在PHT纯化电路中安装新鲜的IX树脂床后，氢积液率的显着增加（超过两倍）。该观察结果表明，由于这种化学的变化，馈线变薄速率发生了显着变化。较高的腐蚀速率（仍然远低于驱动前）持续了一个月，直到计划中的停电并以较高的植物重新启动后恢复，但此后一直在下降。初步计算表明，新鲜的离子交换树脂以足够快的速率从溶液中去除铁，以显着影响核心出口处的不饱和度，因此改变了流动加速的腐蚀速率。 该项目的目的是评估当前离子交换树脂实践对馈线完整性的影响，并确定是否可以优化使用的树脂混合物，以降低在满足活动运输需求时从溶液中删除的铁的量。该范围包括对PLNGS HEPRO数据（2006年）的完整分析，以评估离子交换树脂实践与FAC率之间的联系。这项工作的次要方面将进一步评估铁物种的离子交换树脂的吸收特征，以及形成胺的膜的吸收特征，这些胺可以用作车站的次要系统的添加剂。