ANS 58.9-1981（R2020）为设计师提供了标准，解释了联邦法规第50部分第10篇“生产和使用设施许可证”附录A“核电厂通用设计标准”中关于安全相关轻水反应堆（LWR）流体系统单一故障设计的要求。针对各种始发事件后的安全相关流体系统，介绍了主动和被动故障的处理方法。目前可接受的做法被用作这些标准的基础。

ANS 58.9-1981 (R2020) provides criteria for the designer which interpret the requirements of Title 10, Code of Federal Regulations, Part 50, "Licensing of Production and Utilization Facilities," Appendix A, "General Design Criteria for Nuclear Power Plants," with respect to design against single failures in safety-related Light Water Reactor (LWR) fluid systems. Means of treating both active and passive failures are addressed for safety-related fluid systems following various initiating events. Current acceptable practice is used as a basis for these criteria.