The Design Criteria Policy Document will provide guidance on the types of Design Events, Design Basis Accidents, and Design Criteria for Important To Radiological Safety Systems, Structures, and Components (SSCs) to be assumed during the design of the MRS facility. Definitions of key terms associated with Design Events are also included with this document. Appropriate combinations of Design Events and criteria is identified.

This conceptual design report presents results of the monitored retrievable storage facility (MRS) conceptual design effort. Six design concepts were investigated for handling and storing spent nuclear fuel assemblies at the MRS and are presented in this report. All six of these design concepts satisfy program requirements and provide safe and efficient methods to handle and store spent nuclear fuel. This conceptual design is an important step towards furthering the civilian radioactive waste management system program.