Literature on the changes in the specimen dimensions and volume after high energy neutron irradiation of more than a dozen graphites were examined. Some of these data have been previously used to design graphite components in gas cooled reactors. The dimensional change behavior of a graphite is rather unique and depends on both the irradiation temperature and accumulated irradiation dose. The characteristics of the dimensional and volume change behavior of several graphites were analyzed and evaluated from engineering design consideration of graphite components. Specifically, six parameters were derived from the dimensional and volume change behavior. These parameters can serve as “figures-of-merit” (FOM) to enable engineering judgement on the irradiation-induced dimensional and volume change behavior of nuclear graphites, and are referred to as “derived figure-of-merit (DFOM).” The DFOMs also provide engineering bases to examine the opportunity to select several competing graphites for fulfilling the design and operation of components in reactor service. The utility of these DFOMs can be realized potentially in designing inservice inspection and component condition monitoring (CCM) protocols that are effective and efficient both technically and economically. The DFOMs, in combination, also can guide the reactor operator to arrive at optimum component replacement schedule for graphite components, which ensure maintaining graphite components functional requirements and related reactor safety issues.

检查了十几种石墨在高能中子辐照后试样尺寸和体积变化的文献。其中一些数据以前曾用于设计气冷反应堆中的石墨部件。石墨的尺寸变化行为相当独特，取决于辐照温度和累积辐照剂量。从石墨构件的工程设计考虑，对几种石墨的尺寸和体积变化行为特征进行了分析和评价。具体而言，六个参数来自尺寸和体积变化行为。这些参数可以作为“品质因数”（FOM），以便对核石墨的辐射引起的尺寸和体积变化行为进行工程判断，并且被称为“衍生品质因数 (DFOM)”。DFOM 还提供工程基础，以检查选择几种竞争石墨的机会，以实现反应堆服务组件的设计和运行。这些 DFOM 的效用可以潜在地在设计在技术和经济上有效和高效的在役检查和组件状态监测 (CCM) 协议中实现。DFOM 结合使用还可以指导反应堆操作员为石墨部件制定最佳的部件更换计划，从而确保维持石墨部件的功能要求和相关的反应堆安全问题。” DFOM 还提供了工程基础，以检查选择几种竞争石墨的机会，以实现反应堆服务组件的设计和运行。这些 DFOM 的效用可以在设计在技术和经济上都有效和高效的在役检查和组件状态监测 (CCM) 协议中潜在地实现。DFOM 结合使用还可以指导反应堆操作员为石墨部件制定最佳的部件更换计划，从而确保维持石墨部件的功能要求和相关的反应堆安全问题。” DFOM 还提供了工程基础，以检查选择几种竞争石墨的机会，以实现反应堆服务组件的设计和运行。这些 DFOM 的效用可以在设计在技术和经济上都有效和高效的在役检查和组件状态监测 (CCM) 协议中潜在地实现。DFOM 结合使用还可以指导反应堆操作员为石墨部件制定最佳的部件更换计划，从而确保维持石墨部件的功能要求和相关的反应堆安全问题。这些 DFOM 的效用可以在设计在技术和经济上都有效和高效的在役检查和组件状态监测 (CCM) 协议中潜在地实现。DFOM 结合使用还可以指导反应堆操作员为石墨部件制定最佳的部件更换计划，从而确保维持石墨部件的功能要求和相关的反应堆安全问题。这些 DFOM 的效用可以在设计在技术和经济上都有效和高效的在役检查和组件状态监测 (CCM) 协议中潜在地实现。DFOM 结合使用还可以指导反应堆操作员为石墨部件制定最佳的部件更换计划，从而确保维持石墨部件的功能要求和相关的反应堆安全问题。