Working Group

Scope: This standard provides for the safe conduct of critical experiments. Such experiments study neutron behavior in a fission device where the energy produced is insufficient to require auxiliary cooling, and the power history is such that the inventory of long-lived fission products is insignificant.

Scope: This standard provides a single technology neutral categorization and classification process for Structures, Systems, and Components (SSCs) for new nuclear power plants that is, where possible, risk informed and performance based. This process will then be used to determine special treatment of SSCs to meet the safety basis. This standard applies only to those new design facilities (i.e. greater than Generation III) that must obtain an operating license from the proper regulatory authority. It provides a complete (e.g., necessary and sufficient) repeatable logical process based upon risk-informed, performance based objectives. Other voluntary consensus standards may often be required in order to complete the entire process for all SSCs. Those standards are incorporated by reference.

Scope: This standard is advanced LWR-specific and applicable to new reactor designs. It specifies objectives for augmenting deterministic nuclear safety design practices using risk-informed, performance-based (RIPB) methods. The application of RIPB methods to high level safety criteria selection, nuclear safety functions and margin, licensing-basis-event selection and acceptance criteria, equipment classification and categorization, demonstrating defense-in-depth adequacy and evaluating conformance with regulatory positions described to ensure RIPB-augmentation of nuclear safety design practices is consistently applied for all new advanced LWR reactor technologies. The application of this standard to existing reactors is beyond the scope of this standard.

Scope: This technology-neutral guidance standard provides information for preparation of technology-specific new reactor design standards and supporting documents. New reactor designs include modular reactors using light water nuclear technologies and advanced reactors using non-light water nuclear technologies as the basis for design. This guidance standard addresses the objectives for facilitating the incorporation of risk- and performance-based information into a new reactor safety design process through all stages of the facility lifecycle. This guidance standard is focused at a high level to enable risk-informed and performance-based (RIPB) results to be consistently applied across all stages of plant lifecycle and to be integrated throughout design development. The information of this guidance standard supports RIPB input to key safety aspects such as high-level criteria selection, licensing basis event selection, safety margin, equipment classification, and defense in depth as well as integration of these aspects with multiple design needs.