RCC-MRx Code is the result of the merger of the RCC-MX 2008, developed in the context of the research reactor Jules Horowitz Reactor project, and the RCC-MR 2007, which established rules applicable to the design of components operating at high temperature and to the Vacuum Vessel of ITER. This code has been issued in French and English versions by AFCEN (Association Francaise pour les regles de Conception et de Construction des Materiels des Chaudieres Electro-nucleaires) in 2012, 2015, and a new edition will be published by the end of 2018. This new edition integrates a significant evolution for the rules dedicated to the ratchetting evaluation through the so-called "efficiency diagram rule". This rule was initially developed to present a less penalizing rule than the classical "3 Sm" rule and to analyze the interaction between creep and ratchetting in the high temperature domain. Since the first edition of RCC-MR code, several modifications have been made to this rule to improve its representativeness for this kind of damage. These modifications were motivated and justified by numerous experimental tests. The last significant evolution is thus the occasion to present through this article, the background of this rule, the major evolutions already incorporated in the code and also the on-going developments.
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机译：RCC-MRX代码是在研究反应堆Jules Horowitz反应堆项目和RCC-MR 2007的上下文中开发的RCC-MX 2008的合并结果，该项目建立了适用于在高温下运行的部件设计的规则并向磨料的真空血管。这段代码已由Afcen（协会弗朗西斯倒入Les De Conception et de Constructions des Materiels des Chathieres Electro-Nuclieres Electro-Nucleaires）发布于法语和英文版本，2015年和新版将于2018年底发布通过所谓的“效率图规则”，新版本集成了专用于棘轮评估的规则的重要演变。最初开发了该规则以提出比经典的“3 SM”规则的惩罚规则较少，并分析高温域中蠕变和棘轮之间的相互作用。自第一版RCC-MR代码以来，已经对这一规则进行了几种修改，以提高其对这种损坏的代表性。这些修饰是通过许多实验测试的动机和合理的。因此，最后一个重要的进化是通过本文的场合，这条规则的背景，已经在代码中纳入了主要的演变，也纳入了正在进行的发展。
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