This standard specifies criteria for the safety classification of items (structures@ systems@ components@ and parts (including consumables) in a light water reactor (LWR) nuclear power plant as either safety-related (Q)@ supplemented grade (S)@ or non-safety-related (N). Criteria are also provided to establish a procurement subclassification within Class Q@ called commercial grade (C). In addition@ pressure integrity classification criteria are provided for the assignment of Classes 1@ 2@ 3@ 4@ or 5 to the pressure retaining portions of items. Purpose. This standard has two purposes. The first is to provide criteria for the safety classification of items in LWR nuclear power plants. The second is to provide criteria for the assignment of pressure integrity Classes to pressure- retaining items. The application of the criteria specified in this document is intended to ensure that the safety and pressure integrity classifications of an item are based on that item's functions.4 The classification criteria specified in this standard: (1) establish an objective@ technically sound rationale for the determination of safety and pressure integrity classifications5- one that minimizes subjective judgments and incorrect classifications; (2) include provisions for ensuring that d items required by licensing requirements and commitments are appropriately classified; (3) allow maximum compatibility with plant-specific designs@ policies@ and procedures; and (4) achieve consistency (i.e.@ minimize classification differences among similar items in the plant; among utilities@ vendors@ designers@ and regulators; and with current industry and NRC practices). 4 Historically@ the classifications of some items have been based on licensing commitments and not only on the regulatory definition and the functional criteria presented in this standard. The licensing bases of a new plant or design might require a different classification of some items than the regulatory definition and the criteria provide din this standard. 5 See Appendix B for discussion of other types of classifications.