WRC公告457、458和459构成了一套完整的文件，记录了基于to的ASME第三节RTNDT程序替代方案的制定，以及ASME规范案例的制定。WRC公告457“铁素体钢的断裂韧性和ASTM参考温度（To）”，描述了由压力容器研究委员会部件失效模式委员会发起的三阶段项目的结果:1。为了验证压力容器钢的主曲线方法，2。开发一个数据库，该数据库可用于ASME锅炉和压力容器规范程序的未来开发，该程序使用To或主曲线方法，以及3。 使用这些数据开发和验证ASME规范案例。提出了一个拟议的ASME规范案例，该案例使用了当前的KIc曲线，但使用了基于断裂韧性参考温度的等效RTNDT，而不是基于夏比冲击和落锤试验结果的RTNDT值。两个单独的代码案例基于拟议草案已经批准ASME锅炉和压力容器代码-代码案例N-629和N-631分别为席十一和第三节应用。WRC公告458“铁素体钢主曲线断裂韧度方法的应用”提供了背景信息和技术参数，以支持使用主曲线断裂韧度方法为铁素体压力容器钢提供现有参考温度（RTNDT）的替代定义和统计定义的断裂韧度曲线。 回顾了ASME锅炉和压力容器规范的起源和基础，第III和席III，下层断裂韧性曲线的RTNDR法，并与新的主曲线法进行了对比。该报告包括主曲线法应用于辐照压力容器钢的基础，以及未辐照铁素体压力边界钢的最初预期应用。WRC公告459“RPV评估主曲线策略”通过将主曲线程序的结果与现有反应堆压力容器完整性评估方法相结合，描述了主曲线方法的应用。

WRC Bulletins 457, 458 and 459 form an integral set documenting the development of an alternative to the ASME Section III RTNDT procedure based on To, and the development of an ASME Code Case. WRC Bulletin 457 "Fracture Toughness of Ferritic Steels and ASTM Reference Temperature (To)," describes the results of the three-phase project initiated by the Committee on Failure Modes of Components of the Pressure Vessel Research Council:1. To verify the Master Curve approach for pressure vessel steels,2. To develop a database which can be used in the future development of ASME Boiler and Pressure Vessel Code procedures which make use of To or the Master Curve approach, and3. To use the data to develop and verify an ASME Code Case.A proposed ASME Code Case is presented which uses the current KIc curve, but is shifted using an equivalent RTNDT which is based on the fracture toughness reference temperature, To, rather than the RTNDT value based on Charpy impact and drop weight test results.Two separate Code Cases based on the proposed draft have been approved by the ASME Boiler and Pressure Vessel Code -- Code Cases N-629 and N-631 for Section XI and Section III applications, respectively. WRC Bulletin 458 "Application of Master Curve Fracture Toughness Methodology for Ferritic Steels" provides background information and technical arguments in support of using the Master Curve fracture toughness approach to provide an alternative definition of the existing reference temperature (RTNDT) and statistically defined fracture toughness curves for ferritic pressure vessel steels. The origin and bases of the ASME Boiler and Pressure Vessel Code, Sections III and XI, lower bound fracture toughness curves using the RTNDTreferencing approach are reviewed and contrasted with the new Master Curve method. The report includes the basis for application of the Master Curve methodology to irradiated pressure vessel steels, as well as the originally intended application to un-irradiated ferritic pressure boundary steels. WRC Bulletin 459 "Master Curve Strategies for RPV Assessment" describes the application of the Master Curve methodologies by integrating the results using the Master Curve procedure to the existing reactor pressure vessel integrity evaluation methodology.